Class 9 Science Atoms and Molecules Important Formulas
Important Formulas for Class 9 Science Atoms and Molecules. Try first, then reveal the answer. These are exam-oriented practice items, not copied board papers.
Practice questions aligned to NCERT topics used in CBSE classrooms. These are original exam-oriented questions for revision — not official CBSE board papers and not a guarantee of any exam question. Always match the textbook issued by your school and the latest PDFs on ncert.nic.in and cbseacademic.nic.in.
This chapter is mostly ideas and definitions rather than a formula sheet. Use the concept list on the chapter page.
Atoms and Molecules. Law of conservation of mass.
Atoms and Molecules. Law of constant proportions.
Atoms and Molecules. Atom is the smallest unit of an element that takes part in a reaction as taught here.
Atoms and Molecules. Molecule of an element or compound.
Atoms and Molecules. Chemical formula uses symbols and valency.
Atoms and Molecules. Atoms and Molecules is an NCERT chapter taught in CBSE Class 9 Science.
Textbook first. Read the definitions, diagrams and solved examples in the NCERT textbook before practising extra questions.
Keywords. Every chapter ends with keywords or a summary that is useful for one-mark answers.
Examples. CBSE often tests a concept by asking a daily-life example from the same chapter.
Diagrams. If the chapter has a diagram, practise labelling it — many school tests ask for labelled figures.
Revision. Write three points from Atoms and Molecules in your own words; that is enough for a short-answer start.
Accuracy. Use the terms used in the NCERT book; do not replace them with unofficial names.
Practice. Mix MCQs with short answers so you remember both facts and explanations from Atoms and Molecules.
Practice set
Q1MCQ1 markEasyRevision pick
Choose the correct statement related to Atoms and Molecules in the chapter Atoms and Molecules.
A. CBSE often tests a concept by asking a daily-life example from the same chapter
B. Law of conservation of mass
C. Atoms and Molecules is an NCERT chapter taught in CBSE Class 9 Science
D. Atom is the smallest unit of an element that takes part in a reaction as taught here
Answer
B. Law of conservation of mass
Explanation
Law of conservation of mass. The other options mix ideas from nearby topics or reverse the textbook fact.
Meta
Class: Class 9 · Subject: Science · Chapter: Atoms and Molecules · Original GKSchools practice (NCERT-aligned, not an official CBSE paper).
Q2MCQ1 markEasy
Choose the correct statement related to Atoms and Molecules in the chapter Atoms and Molecules.
A. Read the definitions, diagrams and solved examples in the NCERT textbook before practising extra questions
B. If the chapter has a diagram, practise labelling it — many school tests ask for labelled figures
C. Law of constant proportions
D. Molecule of an element or compound
Answer
C. Law of constant proportions
Explanation
Law of constant proportions. The other options mix ideas from nearby topics or reverse the textbook fact.
Meta
Class: Class 9 · Subject: Science · Chapter: Atoms and Molecules · Original GKSchools practice (NCERT-aligned, not an official CBSE paper).
Q3MCQ1 markEasy
Choose the correct statement related to Atoms and Molecules in the chapter Atoms and Molecules.
A. Write three points from Atoms and Molecules in your own words; that is enough for a short-answer start
B. Every chapter ends with keywords or a summary that is useful for one-mark answers
C. Chemical formula uses symbols and valency
D. Atom is the smallest unit of an element that takes part in a reaction as taught here
Answer
D. Atom is the smallest unit of an element that takes part in a reaction as taught here
Explanation
Atom is the smallest unit of an element that takes part in a reaction as taught here. The other options mix ideas from nearby topics or reverse the textbook fact.
Meta
Class: Class 9 · Subject: Science · Chapter: Atoms and Molecules · Original GKSchools practice (NCERT-aligned, not an official CBSE paper).
Q4MCQ1 markEasy
Choose the correct statement related to Atoms and Molecules in the chapter Atoms and Molecules.
A. Atoms and Molecules is an NCERT chapter taught in CBSE Class 9 Science
B. Use the terms used in the NCERT book; do not replace them with unofficial names
C. Molecule of an element or compound
D. CBSE often tests a concept by asking a daily-life example from the same chapter
Answer
C. Molecule of an element or compound
Explanation
Molecule of an element or compound. The other options mix ideas from nearby topics or reverse the textbook fact.
Meta
Class: Class 9 · Subject: Science · Chapter: Atoms and Molecules · Original GKSchools practice (NCERT-aligned, not an official CBSE paper).
Q5MCQ1 markModerateRevision pick
Choose the correct statement related to Atoms and Molecules in the chapter Atoms and Molecules.
A. Read the definitions, diagrams and solved examples in the NCERT textbook before practising extra questions
B. Mix MCQs with short answers so you remember both facts and explanations from Atoms and Molecules
C. Chemical formula uses symbols and valency
D. If the chapter has a diagram, practise labelling it — many school tests ask for labelled figures
Answer
C. Chemical formula uses symbols and valency
Explanation
Chemical formula uses symbols and valency. The other options mix ideas from nearby topics or reverse the textbook fact.
Meta
Class: Class 9 · Subject: Science · Chapter: Atoms and Molecules · Original GKSchools practice (NCERT-aligned, not an official CBSE paper).
Q6MCQ1 markEasy
Choose the correct statement related to Atoms and Molecules in the chapter Atoms and Molecules.
A. Write three points from Atoms and Molecules in your own words; that is enough for a short-answer start
B. Atoms and Molecules is an NCERT chapter taught in CBSE Class 9 Science
C. Molecule of an element or compound
D. Every chapter ends with keywords or a summary that is useful for one-mark answers
Answer
B. Atoms and Molecules is an NCERT chapter taught in CBSE Class 9 Science
Explanation
Atoms and Molecules is an NCERT chapter taught in CBSE Class 9 Science. The other options mix ideas from nearby topics or reverse the textbook fact.
Meta
Class: Class 9 · Subject: Science · Chapter: Atoms and Molecules · Original GKSchools practice (NCERT-aligned, not an official CBSE paper).
Q7MCQ1 markEasy
Choose the correct statement related to Textbook first in the chapter Atoms and Molecules.
A. The textbook says the opposite of this statement
B. CBSE often tests a concept by asking a daily-life example from the same chapter
C. Read the definitions, diagrams and solved examples in the NCERT textbook before practising extra questions
D. Use the terms used in the NCERT book; do not replace them with unofficial names
Answer
C. Read the definitions, diagrams and solved examples in the NCERT textbook before practising extra questions
Explanation
Read the definitions, diagrams and solved examples in the NCERT textbook before practising extra questions. The other options mix ideas from nearby topics or reverse the textbook fact.
Meta
Class: Class 9 · Subject: Science · Chapter: Atoms and Molecules · Original GKSchools practice (NCERT-aligned, not an official CBSE paper).
Q8MCQ1 markEasy
Choose the correct statement related to Keywords in the chapter Atoms and Molecules.
A. This happens only in a laboratory and never in daily life
B. Mix MCQs with short answers so you remember both facts and explanations from Atoms and Molecules
C. If the chapter has a diagram, practise labelling it — many school tests ask for labelled figures
D. Every chapter ends with keywords or a summary that is useful for one-mark answers
Answer
D. Every chapter ends with keywords or a summary that is useful for one-mark answers
Explanation
Every chapter ends with keywords or a summary that is useful for one-mark answers. The other options mix ideas from nearby topics or reverse the textbook fact.
Meta
Class: Class 9 · Subject: Science · Chapter: Atoms and Molecules · Original GKSchools practice (NCERT-aligned, not an official CBSE paper).
Q9MCQ1 markEasyRevision pick
Choose the correct statement related to Examples in the chapter Atoms and Molecules.
A. Write three points from Atoms and Molecules in your own words; that is enough for a short-answer start
B. This idea is not part of the NCERT chapter
C. CBSE often tests a concept by asking a daily-life example from the same chapter
D. Law of conservation of mass
Answer
C. CBSE often tests a concept by asking a daily-life example from the same chapter
Explanation
CBSE often tests a concept by asking a daily-life example from the same chapter. The other options mix ideas from nearby topics or reverse the textbook fact.
Meta
Class: Class 9 · Subject: Science · Chapter: Atoms and Molecules · Original GKSchools practice (NCERT-aligned, not an official CBSE paper).
Q10MCQ1 markModerate
Choose the correct statement related to Diagrams in the chapter Atoms and Molecules.
A. Law of constant proportions
B. Use the terms used in the NCERT book; do not replace them with unofficial names
C. The textbook says the opposite of this statement
D. If the chapter has a diagram, practise labelling it — many school tests ask for labelled figures
Answer
D. If the chapter has a diagram, practise labelling it — many school tests ask for labelled figures
Explanation
If the chapter has a diagram, practise labelling it — many school tests ask for labelled figures. The other options mix ideas from nearby topics or reverse the textbook fact.
Meta
Class: Class 9 · Subject: Science · Chapter: Atoms and Molecules · Original GKSchools practice (NCERT-aligned, not an official CBSE paper).
Q11MCQ1 markEasy
Choose the correct statement related to Revision in the chapter Atoms and Molecules.
A. Atom is the smallest unit of an element that takes part in a reaction as taught here
B. Write three points from Atoms and Molecules in your own words; that is enough for a short-answer start
C. Mix MCQs with short answers so you remember both facts and explanations from Atoms and Molecules
D. This happens only in a laboratory and never in daily life
Answer
B. Write three points from Atoms and Molecules in your own words; that is enough for a short-answer start
Explanation
Write three points from Atoms and Molecules in your own words; that is enough for a short-answer start. The other options mix ideas from nearby topics or reverse the textbook fact.
Meta
Class: Class 9 · Subject: Science · Chapter: Atoms and Molecules · Original GKSchools practice (NCERT-aligned, not an official CBSE paper).
Q12MCQ1 markEasy
Choose the correct statement related to Accuracy in the chapter Atoms and Molecules.
A. Molecule of an element or compound
B. This idea is not part of the NCERT chapter
C. Use the terms used in the NCERT book; do not replace them with unofficial names
D. Law of conservation of mass
Answer
C. Use the terms used in the NCERT book; do not replace them with unofficial names
Explanation
Use the terms used in the NCERT book; do not replace them with unofficial names. The other options mix ideas from nearby topics or reverse the textbook fact.
Meta
Class: Class 9 · Subject: Science · Chapter: Atoms and Molecules · Original GKSchools practice (NCERT-aligned, not an official CBSE paper).
Q13MCQ1 markEasyRevision pick
Choose the correct statement related to Practice in the chapter Atoms and Molecules.
A. Law of constant proportions
B. The textbook says the opposite of this statement
C. Mix MCQs with short answers so you remember both facts and explanations from Atoms and Molecules
D. Chemical formula uses symbols and valency
Answer
C. Mix MCQs with short answers so you remember both facts and explanations from Atoms and Molecules
Explanation
Mix MCQs with short answers so you remember both facts and explanations from Atoms and Molecules. The other options mix ideas from nearby topics or reverse the textbook fact.
Meta
Class: Class 9 · Subject: Science · Chapter: Atoms and Molecules · Original GKSchools practice (NCERT-aligned, not an official CBSE paper).
Q14MCQ1 markEasy
Choose the correct statement related to Atoms and Molecules in the chapter Atoms and Molecules.
A. Read the definitions, diagrams and solved examples in the NCERT textbook before practising extra questions
B. This happens only in a laboratory and never in daily life
C. Molecule of an element or compound
D. Law of conservation of mass
Answer
D. Law of conservation of mass
Explanation
Law of conservation of mass. The other options mix ideas from nearby topics or reverse the textbook fact.
Meta
Class: Class 9 · Subject: Science · Chapter: Atoms and Molecules · Original GKSchools practice (NCERT-aligned, not an official CBSE paper).
Q15MCQ1 markModerate
Choose the correct statement related to Atoms and Molecules in the chapter Atoms and Molecules.
A. Law of constant proportions
B. Every chapter ends with keywords or a summary that is useful for one-mark answers
C. Chemical formula uses symbols and valency
D. Law of conservation of mass
Answer
A. Law of constant proportions
Explanation
Law of constant proportions. The other options mix ideas from nearby topics or reverse the textbook fact.
Meta
Class: Class 9 · Subject: Science · Chapter: Atoms and Molecules · Original GKSchools practice (NCERT-aligned, not an official CBSE paper).
Q16MCQ1 markEasy
Choose the correct statement related to Atoms and Molecules in the chapter Atoms and Molecules.
A. Atom is the smallest unit of an element that takes part in a reaction as taught here
B. CBSE often tests a concept by asking a daily-life example from the same chapter
C. Law of constant proportions
D. Atoms and Molecules is an NCERT chapter taught in CBSE Class 9 Science
Answer
A. Atom is the smallest unit of an element that takes part in a reaction as taught here
Explanation
Atom is the smallest unit of an element that takes part in a reaction as taught here. The other options mix ideas from nearby topics or reverse the textbook fact.
Meta
Class: Class 9 · Subject: Science · Chapter: Atoms and Molecules · Original GKSchools practice (NCERT-aligned, not an official CBSE paper).
Q17MCQ1 markEasyRevision pick
Choose the correct statement related to Atoms and Molecules in the chapter Atoms and Molecules.
A. Atom is the smallest unit of an element that takes part in a reaction as taught here
B. Read the definitions, diagrams and solved examples in the NCERT textbook before practising extra questions
C. If the chapter has a diagram, practise labelling it — many school tests ask for labelled figures
D. Molecule of an element or compound
Answer
D. Molecule of an element or compound
Explanation
Molecule of an element or compound. The other options mix ideas from nearby topics or reverse the textbook fact.
Meta
Class: Class 9 · Subject: Science · Chapter: Atoms and Molecules · Original GKSchools practice (NCERT-aligned, not an official CBSE paper).
Q18MCQ1 markEasy
Choose the correct statement related to Atoms and Molecules in the chapter Atoms and Molecules.
A. Write three points from Atoms and Molecules in your own words; that is enough for a short-answer start
B. Every chapter ends with keywords or a summary that is useful for one-mark answers
C. Molecule of an element or compound
D. Chemical formula uses symbols and valency
Answer
D. Chemical formula uses symbols and valency
Explanation
Chemical formula uses symbols and valency. The other options mix ideas from nearby topics or reverse the textbook fact.
Meta
Class: Class 9 · Subject: Science · Chapter: Atoms and Molecules · Original GKSchools practice (NCERT-aligned, not an official CBSE paper).
Q19MCQ1 markEasy
Choose the correct statement related to Atoms and Molecules in the chapter Atoms and Molecules.
A. Atoms and Molecules is an NCERT chapter taught in CBSE Class 9 Science
B. Chemical formula uses symbols and valency
C. This topic is only for college
D. Law of constant proportions
Answer
A. Atoms and Molecules is an NCERT chapter taught in CBSE Class 9 Science
Explanation
Atoms and Molecules is an NCERT chapter taught in CBSE Class 9 Science. The other options mix ideas from nearby topics or reverse the textbook fact.
Meta
Class: Class 9 · Subject: Science · Chapter: Atoms and Molecules · Original GKSchools practice (NCERT-aligned, not an official CBSE paper).
Q20MCQ1 markModerate
Choose the correct statement related to Textbook first in the chapter Atoms and Molecules.
A. Mix MCQs with short answers so you remember both facts and explanations from Atoms and Molecules
B. Read the definitions, diagrams and solved examples in the NCERT textbook before practising extra questions
C. Atoms and Molecules is an NCERT chapter taught in CBSE Class 9 Science
D. If the chapter has a diagram, practise labelling it — many school tests ask for labelled figures
Answer
B. Read the definitions, diagrams and solved examples in the NCERT textbook before practising extra questions
Explanation
Read the definitions, diagrams and solved examples in the NCERT textbook before practising extra questions. The other options mix ideas from nearby topics or reverse the textbook fact.
Meta
Class: Class 9 · Subject: Science · Chapter: Atoms and Molecules · Original GKSchools practice (NCERT-aligned, not an official CBSE paper).
Q211 Mark1 markEasy
Define or state: Keywords.
Answer
Every chapter ends with keywords or a summary that is useful for one-mark answers.
Explanation
A one-mark answer should use the textbook term and one clear fact — not a long paragraph.
Meta
Class: Class 9 · Subject: Science · Chapter: Atoms and Molecules · Original GKSchools practice (NCERT-aligned, not an official CBSE paper).
Q221 Mark1 markEasy
Define or state: Examples.
Answer
CBSE often tests a concept by asking a daily-life example from the same chapter.
Explanation
A one-mark answer should use the textbook term and one clear fact — not a long paragraph.
Meta
Class: Class 9 · Subject: Science · Chapter: Atoms and Molecules · Original GKSchools practice (NCERT-aligned, not an official CBSE paper).
Q231 Mark1 markEasy
Define or state: Diagrams.
Answer
If the chapter has a diagram, practise labelling it — many school tests ask for labelled figures.
Explanation
A one-mark answer should use the textbook term and one clear fact — not a long paragraph.
Meta
Class: Class 9 · Subject: Science · Chapter: Atoms and Molecules · Original GKSchools practice (NCERT-aligned, not an official CBSE paper).
Q241 Mark1 markEasy
Define or state: Revision.
Answer
Write three points from Atoms and Molecules in your own words; that is enough for a short-answer start.
Explanation
A one-mark answer should use the textbook term and one clear fact — not a long paragraph.
Meta
Class: Class 9 · Subject: Science · Chapter: Atoms and Molecules · Original GKSchools practice (NCERT-aligned, not an official CBSE paper).
Q251 Mark1 markModerate
Define or state: Accuracy.
Answer
Use the terms used in the NCERT book; do not replace them with unofficial names.
Explanation
A one-mark answer should use the textbook term and one clear fact — not a long paragraph.
Meta
Class: Class 9 · Subject: Science · Chapter: Atoms and Molecules · Original GKSchools practice (NCERT-aligned, not an official CBSE paper).
Q261 Mark1 markEasy
Define or state: Practice.
Answer
Mix MCQs with short answers so you remember both facts and explanations from Atoms and Molecules.
Explanation
A one-mark answer should use the textbook term and one clear fact — not a long paragraph.
Meta
Class: Class 9 · Subject: Science · Chapter: Atoms and Molecules · Original GKSchools practice (NCERT-aligned, not an official CBSE paper).
Q271 Mark1 markEasy
Define or state: Atoms and Molecules.
Answer
Law of conservation of mass.
Explanation
A one-mark answer should use the textbook term and one clear fact — not a long paragraph.
Meta
Class: Class 9 · Subject: Science · Chapter: Atoms and Molecules · Original GKSchools practice (NCERT-aligned, not an official CBSE paper).
Q281 Mark1 markEasy
Define or state: Atoms and Molecules.
Answer
Law of constant proportions.
Explanation
A one-mark answer should use the textbook term and one clear fact — not a long paragraph.
Meta
Class: Class 9 · Subject: Science · Chapter: Atoms and Molecules · Original GKSchools practice (NCERT-aligned, not an official CBSE paper).
Q291 Mark1 markEasy
Define or state: Atoms and Molecules.
Answer
Atom is the smallest unit of an element that takes part in a reaction as taught here.
Explanation
A one-mark answer should use the textbook term and one clear fact — not a long paragraph.
Meta
Class: Class 9 · Subject: Science · Chapter: Atoms and Molecules · Original GKSchools practice (NCERT-aligned, not an official CBSE paper).
Q301 Mark1 markModerate
Define or state: Atoms and Molecules.
Answer
Molecule of an element or compound.
Explanation
A one-mark answer should use the textbook term and one clear fact — not a long paragraph.
Meta
Class: Class 9 · Subject: Science · Chapter: Atoms and Molecules · Original GKSchools practice (NCERT-aligned, not an official CBSE paper).
Q312 Mark2 marksModerate
Give two points to explain Atoms and Molecules as used in Atoms and Molecules.
Answer
1. Chemical formula uses symbols and valency.
2. Keep the NCERT wording and add one daily-life example from the same chapter.
Explanation
Two-mark answers work best as two numbered points. One definition plus one example is usually enough.
Meta
Class: Class 9 · Subject: Science · Chapter: Atoms and Molecules · Original GKSchools practice (NCERT-aligned, not an official CBSE paper).
Q322 Mark2 marksDifficult
Give two points to explain Atoms and Molecules as used in Atoms and Molecules.
Answer
1. Atoms and Molecules is an NCERT chapter taught in CBSE Class 9 Science.
2. Keep the NCERT wording and add one daily-life example from the same chapter.
Explanation
Two-mark answers work best as two numbered points. One definition plus one example is usually enough.
Meta
Class: Class 9 · Subject: Science · Chapter: Atoms and Molecules · Original GKSchools practice (NCERT-aligned, not an official CBSE paper).
Q332 Mark2 marksModerate
Give two points to explain Textbook first as used in Atoms and Molecules.
Answer
1. Read the definitions, diagrams and solved examples in the NCERT textbook before practising extra questions.
2. Keep the NCERT wording and add one daily-life example from the same chapter.
Explanation
Two-mark answers work best as two numbered points. One definition plus one example is usually enough.
Meta
Class: Class 9 · Subject: Science · Chapter: Atoms and Molecules · Original GKSchools practice (NCERT-aligned, not an official CBSE paper).
Q342 Mark2 marksModerate
Give two points to explain Keywords as used in Atoms and Molecules.
Answer
1. Every chapter ends with keywords or a summary that is useful for one-mark answers.
2. Keep the NCERT wording and add one daily-life example from the same chapter.
Explanation
Two-mark answers work best as two numbered points. One definition plus one example is usually enough.
Meta
Class: Class 9 · Subject: Science · Chapter: Atoms and Molecules · Original GKSchools practice (NCERT-aligned, not an official CBSE paper).
Q352 Mark2 marksModerate
Give two points to explain Examples as used in Atoms and Molecules.
Answer
1. CBSE often tests a concept by asking a daily-life example from the same chapter.
2. Keep the NCERT wording and add one daily-life example from the same chapter.
Explanation
Two-mark answers work best as two numbered points. One definition plus one example is usually enough.
Meta
Class: Class 9 · Subject: Science · Chapter: Atoms and Molecules · Original GKSchools practice (NCERT-aligned, not an official CBSE paper).
Q362 Mark2 marksDifficult
Give two points to explain Diagrams as used in Atoms and Molecules.
Answer
1. If the chapter has a diagram, practise labelling it — many school tests ask for labelled figures.
2. Keep the NCERT wording and add one daily-life example from the same chapter.
Explanation
Two-mark answers work best as two numbered points. One definition plus one example is usually enough.
Meta
Class: Class 9 · Subject: Science · Chapter: Atoms and Molecules · Original GKSchools practice (NCERT-aligned, not an official CBSE paper).
Q372 Mark2 marksModerate
Give two points to explain Revision as used in Atoms and Molecules.
Answer
1. Write three points from Atoms and Molecules in your own words; that is enough for a short-answer start.
2. Keep the NCERT wording and add one daily-life example from the same chapter.
Explanation
Two-mark answers work best as two numbered points. One definition plus one example is usually enough.
Meta
Class: Class 9 · Subject: Science · Chapter: Atoms and Molecules · Original GKSchools practice (NCERT-aligned, not an official CBSE paper).
Q382 Mark2 marksModerate
Give two points to explain Accuracy as used in Atoms and Molecules.
Answer
1. Use the terms used in the NCERT book; do not replace them with unofficial names.
2. Keep the NCERT wording and add one daily-life example from the same chapter.
Explanation
Two-mark answers work best as two numbered points. One definition plus one example is usually enough.
Meta
Class: Class 9 · Subject: Science · Chapter: Atoms and Molecules · Original GKSchools practice (NCERT-aligned, not an official CBSE paper).
Q392 Mark2 marksModerate
Give two points to explain Practice as used in Atoms and Molecules.
Answer
1. Mix MCQs with short answers so you remember both facts and explanations from Atoms and Molecules.
2. Keep the NCERT wording and add one daily-life example from the same chapter.
Explanation
Two-mark answers work best as two numbered points. One definition plus one example is usually enough.
Meta
Class: Class 9 · Subject: Science · Chapter: Atoms and Molecules · Original GKSchools practice (NCERT-aligned, not an official CBSE paper).
Q402 Mark2 marksDifficult
Give two points to explain Atoms and Molecules as used in Atoms and Molecules.
Answer
1. Law of conservation of mass.
2. Keep the NCERT wording and add one daily-life example from the same chapter.
Explanation
Two-mark answers work best as two numbered points. One definition plus one example is usually enough.
Meta
Class: Class 9 · Subject: Science · Chapter: Atoms and Molecules · Original GKSchools practice (NCERT-aligned, not an official CBSE paper).
Q413 Mark3 marksModerateRevision pick
Explain Atoms and Molecules in about three points, with one example.
Answer
Law of constant proportions. Example: Use a situation from the NCERT activity or a labelled diagram in this chapter.
Explanation
Three-mark questions want a short explanation, not a full essay. Link the idea to a figure or an activity.
Meta
Class: Class 9 · Subject: Science · Chapter: Atoms and Molecules · Original GKSchools practice (NCERT-aligned, not an official CBSE paper).
Q423 Mark3 marksModerate
Explain Atoms and Molecules in about three points, with one example.
Answer
Atom is the smallest unit of an element that takes part in a reaction as taught here. Example: Use a situation from the NCERT activity or a labelled diagram in this chapter.
Explanation
Three-mark questions want a short explanation, not a full essay. Link the idea to a figure or an activity.
Meta
Class: Class 9 · Subject: Science · Chapter: Atoms and Molecules · Original GKSchools practice (NCERT-aligned, not an official CBSE paper).
Q433 Mark3 marksModerate
Explain Atoms and Molecules in about three points, with one example.
Answer
Molecule of an element or compound. Example: Use a situation from the NCERT activity or a labelled diagram in this chapter.
Explanation
Three-mark questions want a short explanation, not a full essay. Link the idea to a figure or an activity.
Meta
Class: Class 9 · Subject: Science · Chapter: Atoms and Molecules · Original GKSchools practice (NCERT-aligned, not an official CBSE paper).
Q443 Mark3 marksDifficult
Explain Atoms and Molecules in about three points, with one example.
Answer
Chemical formula uses symbols and valency. Example: Use a situation from the NCERT activity or a labelled diagram in this chapter.
Explanation
Three-mark questions want a short explanation, not a full essay. Link the idea to a figure or an activity.
Meta
Class: Class 9 · Subject: Science · Chapter: Atoms and Molecules · Original GKSchools practice (NCERT-aligned, not an official CBSE paper).
Q453 Mark3 marksModerateRevision pick
Explain Atoms and Molecules in about three points, with one example.
Answer
Atoms and Molecules is an NCERT chapter taught in CBSE Class 9 Science. Example: Use a situation from the NCERT activity or a labelled diagram in this chapter.
Explanation
Three-mark questions want a short explanation, not a full essay. Link the idea to a figure or an activity.
Meta
Class: Class 9 · Subject: Science · Chapter: Atoms and Molecules · Original GKSchools practice (NCERT-aligned, not an official CBSE paper).
Q463 Mark3 marksModerate
Explain Textbook first in about three points, with one example.
Answer
Read the definitions, diagrams and solved examples in the NCERT textbook before practising extra questions. Example: Use a situation from the NCERT activity or a labelled diagram in this chapter.
Explanation
Three-mark questions want a short explanation, not a full essay. Link the idea to a figure or an activity.
Meta
Class: Class 9 · Subject: Science · Chapter: Atoms and Molecules · Original GKSchools practice (NCERT-aligned, not an official CBSE paper).
Q473 Mark3 marksModerate
Explain Keywords in about three points, with one example.
Answer
Every chapter ends with keywords or a summary that is useful for one-mark answers. Example: Use a situation from the NCERT activity or a labelled diagram in this chapter.
Explanation
Three-mark questions want a short explanation, not a full essay. Link the idea to a figure or an activity.
Meta
Class: Class 9 · Subject: Science · Chapter: Atoms and Molecules · Original GKSchools practice (NCERT-aligned, not an official CBSE paper).
Q483 Mark3 marksDifficult
Explain Examples in about three points, with one example.
Answer
CBSE often tests a concept by asking a daily-life example from the same chapter. Example: Use a situation from the NCERT activity or a labelled diagram in this chapter.
Explanation
Three-mark questions want a short explanation, not a full essay. Link the idea to a figure or an activity.
Meta
Class: Class 9 · Subject: Science · Chapter: Atoms and Molecules · Original GKSchools practice (NCERT-aligned, not an official CBSE paper).
Q494 Mark4 marksModerate
Write a long answer on Diagrams. Include definition, explanation and one application.
Answer
Diagrams — If the chapter has a diagram, practise labelling it — many school tests ask for labelled figures. Explain the idea in order (definition → working → result). End with one application from daily life or a numerical/diagram if the chapter has one.
Explanation
Long answers are marked for structure. Use headings or numbered steps so the examiner can see each part.
Meta
Class: Class 9 · Subject: Science · Chapter: Atoms and Molecules · Original GKSchools practice (NCERT-aligned, not an official CBSE paper).
Q504 Mark4 marksModerate
Write a long answer on Revision. Include definition, explanation and one application.
Answer
Revision — Write three points from Atoms and Molecules in your own words; that is enough for a short-answer start. Explain the idea in order (definition → working → result). End with one application from daily life or a numerical/diagram if the chapter has one.
Explanation
Long answers are marked for structure. Use headings or numbered steps so the examiner can see each part.
Meta
Class: Class 9 · Subject: Science · Chapter: Atoms and Molecules · Original GKSchools practice (NCERT-aligned, not an official CBSE paper).
Q514 Mark4 marksModerate
Write a long answer on Accuracy. Include definition, explanation and one application.
Answer
Accuracy — Use the terms used in the NCERT book; do not replace them with unofficial names. Explain the idea in order (definition → working → result). End with one application from daily life or a numerical/diagram if the chapter has one.
Explanation
Long answers are marked for structure. Use headings or numbered steps so the examiner can see each part.
Meta
Class: Class 9 · Subject: Science · Chapter: Atoms and Molecules · Original GKSchools practice (NCERT-aligned, not an official CBSE paper).
Q524 Mark4 marksDifficult
Write a long answer on Practice. Include definition, explanation and one application.
Answer
Practice — Mix MCQs with short answers so you remember both facts and explanations from Atoms and Molecules. Explain the idea in order (definition → working → result). End with one application from daily life or a numerical/diagram if the chapter has one.
Explanation
Long answers are marked for structure. Use headings or numbered steps so the examiner can see each part.
Meta
Class: Class 9 · Subject: Science · Chapter: Atoms and Molecules · Original GKSchools practice (NCERT-aligned, not an official CBSE paper).
Q534 Mark4 marksModerate
Write a long answer on Atoms and Molecules. Include definition, explanation and one application.
Answer
Atoms and Molecules — Law of conservation of mass. Explain the idea in order (definition → working → result). End with one application from daily life or a numerical/diagram if the chapter has one.
Explanation
Long answers are marked for structure. Use headings or numbered steps so the examiner can see each part.
Meta
Class: Class 9 · Subject: Science · Chapter: Atoms and Molecules · Original GKSchools practice (NCERT-aligned, not an official CBSE paper).
Q544 Mark4 marksModerate
Write a long answer on Atoms and Molecules. Include definition, explanation and one application.
Answer
Atoms and Molecules — Law of constant proportions. Explain the idea in order (definition → working → result). End with one application from daily life or a numerical/diagram if the chapter has one.
Explanation
Long answers are marked for structure. Use headings or numbered steps so the examiner can see each part.
Meta
Class: Class 9 · Subject: Science · Chapter: Atoms and Molecules · Original GKSchools practice (NCERT-aligned, not an official CBSE paper).
Q555 Mark5 marksModerate
Write a long answer on Atoms and Molecules. Include definition, explanation and one application.
Answer
Atoms and Molecules — Atom is the smallest unit of an element that takes part in a reaction as taught here. Explain the idea in order (definition → working → result). End with one application from daily life or a numerical/diagram if the chapter has one.
Explanation
Long answers are marked for structure. Use headings or numbered steps so the examiner can see each part.
Meta
Class: Class 9 · Subject: Science · Chapter: Atoms and Molecules · Original GKSchools practice (NCERT-aligned, not an official CBSE paper).
Q565 Mark5 marksModerate
Write a long answer on Atoms and Molecules. Include definition, explanation and one application.
Answer
Atoms and Molecules — Molecule of an element or compound. Explain the idea in order (definition → working → result). End with one application from daily life or a numerical/diagram if the chapter has one.
Explanation
Long answers are marked for structure. Use headings or numbered steps so the examiner can see each part.
Meta
Class: Class 9 · Subject: Science · Chapter: Atoms and Molecules · Original GKSchools practice (NCERT-aligned, not an official CBSE paper).
Q575 Mark5 marksDifficultRevision pick
Write a long answer on Atoms and Molecules. Include definition, explanation and one application.
Answer
Atoms and Molecules — Chemical formula uses symbols and valency. Explain the idea in order (definition → working → result). End with one application from daily life or a numerical/diagram if the chapter has one.
Explanation
Long answers are marked for structure. Use headings or numbered steps so the examiner can see each part.
Meta
Class: Class 9 · Subject: Science · Chapter: Atoms and Molecules · Original GKSchools practice (NCERT-aligned, not an official CBSE paper).
Q585 Mark5 marksModerate
Write a long answer on Atoms and Molecules. Include definition, explanation and one application.
Answer
Atoms and Molecules — Atoms and Molecules is an NCERT chapter taught in CBSE Class 9 Science. Explain the idea in order (definition → working → result). End with one application from daily life or a numerical/diagram if the chapter has one.
Explanation
Long answers are marked for structure. Use headings or numbered steps so the examiner can see each part.
Meta
Class: Class 9 · Subject: Science · Chapter: Atoms and Molecules · Original GKSchools practice (NCERT-aligned, not an official CBSE paper).
Q595 Mark5 marksModerate
Write a long answer on Textbook first. Include definition, explanation and one application.
Answer
Textbook first — Read the definitions, diagrams and solved examples in the NCERT textbook before practising extra questions. Explain the idea in order (definition → working → result). End with one application from daily life or a numerical/diagram if the chapter has one.
Explanation
Long answers are marked for structure. Use headings or numbered steps so the examiner can see each part.
Meta
Class: Class 9 · Subject: Science · Chapter: Atoms and Molecules · Original GKSchools practice (NCERT-aligned, not an official CBSE paper).
Q605 Mark5 marksDifficult
Write a long answer on Keywords. Include definition, explanation and one application.
Answer
Keywords — Every chapter ends with keywords or a summary that is useful for one-mark answers. Explain the idea in order (definition → working → result). End with one application from daily life or a numerical/diagram if the chapter has one.
Explanation
Long answers are marked for structure. Use headings or numbered steps so the examiner can see each part.
Meta
Class: Class 9 · Subject: Science · Chapter: Atoms and Molecules · Original GKSchools practice (NCERT-aligned, not an official CBSE paper).
Q61Assertion and Reason1 markModerate
Assertion (A): CBSE often tests a concept by asking a daily-life example from the same chapter.
Reason (R): Examples is a key idea in the chapter Atoms and Molecules.
Choose the correct option.
A. Both A and R are true, and R is the correct explanation of A.
B. Both A and R are true, and R is not the correct explanation of A.
C. A is true but R is false.
D. A is false but R is true.
Answer
A. Both A and R are true, and R is the correct explanation of A.
Explanation
Read Assertion and Reason separately first. Here both match the textbook idea, and R explains why A is taught in this chapter.
Meta
Class: Class 9 · Subject: Science · Chapter: Atoms and Molecules · Original GKSchools practice (NCERT-aligned, not an official CBSE paper).
Q62Assertion and Reason1 markModerate
Assertion (A): If the chapter has a diagram, practise labelling it — many school tests ask for labelled figures.
Reason (R): Diagrams is a key idea in the chapter Atoms and Molecules.
Choose the correct option.
A. Both A and R are true, and R is the correct explanation of A.
B. Both A and R are true, and R is not the correct explanation of A.
C. A is true but R is false.
D. A is false but R is true.
Answer
A. Both A and R are true, and R is the correct explanation of A.
Explanation
Read Assertion and Reason separately first. Here both match the textbook idea, and R explains why A is taught in this chapter.
Meta
Class: Class 9 · Subject: Science · Chapter: Atoms and Molecules · Original GKSchools practice (NCERT-aligned, not an official CBSE paper).
Q63Assertion and Reason1 markModerate
Assertion (A): Write three points from Atoms and Molecules in your own words; that is enough for a short-answer start.
Reason (R): Revision is a key idea in the chapter Atoms and Molecules.
Choose the correct option.
A. Both A and R are true, and R is the correct explanation of A.
B. Both A and R are true, and R is not the correct explanation of A.
C. A is true but R is false.
D. A is false but R is true.
Answer
A. Both A and R are true, and R is the correct explanation of A.
Explanation
Read Assertion and Reason separately first. Here both match the textbook idea, and R explains why A is taught in this chapter.
Meta
Class: Class 9 · Subject: Science · Chapter: Atoms and Molecules · Original GKSchools practice (NCERT-aligned, not an official CBSE paper).
Q64Assertion and Reason1 markDifficult
Assertion (A): Use the terms used in the NCERT book; do not replace them with unofficial names.
Reason (R): Accuracy is a key idea in the chapter Atoms and Molecules.
Choose the correct option.
A. Both A and R are true, and R is the correct explanation of A.
B. Both A and R are true, and R is not the correct explanation of A.
C. A is true but R is false.
D. A is false but R is true.
Answer
A. Both A and R are true, and R is the correct explanation of A.
Explanation
Read Assertion and Reason separately first. Here both match the textbook idea, and R explains why A is taught in this chapter.
Meta
Class: Class 9 · Subject: Science · Chapter: Atoms and Molecules · Original GKSchools practice (NCERT-aligned, not an official CBSE paper).
Q65Assertion and Reason1 markModerate
Assertion (A): Mix MCQs with short answers so you remember both facts and explanations from Atoms and Molecules.
Reason (R): Practice is a key idea in the chapter Atoms and Molecules.
Choose the correct option.
A. Both A and R are true, and R is the correct explanation of A.
B. Both A and R are true, and R is not the correct explanation of A.
C. A is true but R is false.
D. A is false but R is true.
Answer
A. Both A and R are true, and R is the correct explanation of A.
Explanation
Read Assertion and Reason separately first. Here both match the textbook idea, and R explains why A is taught in this chapter.
Meta
Class: Class 9 · Subject: Science · Chapter: Atoms and Molecules · Original GKSchools practice (NCERT-aligned, not an official CBSE paper).
Q66Assertion and Reason1 markModerate
Assertion (A): Law of conservation of mass.
Reason (R): Atoms and Molecules is a key idea in the chapter Atoms and Molecules.
Choose the correct option.
A. Both A and R are true, and R is the correct explanation of A.
B. Both A and R are true, and R is not the correct explanation of A.
C. A is true but R is false.
D. A is false but R is true.
Answer
A. Both A and R are true, and R is the correct explanation of A.
Explanation
Read Assertion and Reason separately first. Here both match the textbook idea, and R explains why A is taught in this chapter.
Meta
Class: Class 9 · Subject: Science · Chapter: Atoms and Molecules · Original GKSchools practice (NCERT-aligned, not an official CBSE paper).
Q67Assertion and Reason1 markModerate
Assertion (A): Law of constant proportions.
Reason (R): Atoms and Molecules is a key idea in the chapter Atoms and Molecules.
Choose the correct option.
A. Both A and R are true, and R is the correct explanation of A.
B. Both A and R are true, and R is not the correct explanation of A.
C. A is true but R is false.
D. A is false but R is true.
Answer
A. Both A and R are true, and R is the correct explanation of A.
Explanation
Read Assertion and Reason separately first. Here both match the textbook idea, and R explains why A is taught in this chapter.
Meta
Class: Class 9 · Subject: Science · Chapter: Atoms and Molecules · Original GKSchools practice (NCERT-aligned, not an official CBSE paper).
Q68Assertion and Reason1 markDifficult
Assertion (A): Atom is the smallest unit of an element that takes part in a reaction as taught here.
Reason (R): Atoms and Molecules is a key idea in the chapter Atoms and Molecules.
Choose the correct option.
A. Both A and R are true, and R is the correct explanation of A.
B. Both A and R are true, and R is not the correct explanation of A.
C. A is true but R is false.
D. A is false but R is true.
Answer
A. Both A and R are true, and R is the correct explanation of A.
Explanation
Read Assertion and Reason separately first. Here both match the textbook idea, and R explains why A is taught in this chapter.
Meta
Class: Class 9 · Subject: Science · Chapter: Atoms and Molecules · Original GKSchools practice (NCERT-aligned, not an official CBSE paper).
Q69Case Based4 marksModerateRevision pick
A student is revising Atoms and Molecules and notes: “Molecule of an element or compound.” Using this case, answer: (i) Name the idea. (ii) State it in your own words. (iii) Give one classroom or daily-life use.
Answer
(i) Atoms and Molecules.
(ii) Molecule of an element or compound.
(iii) Apply it in a school experiment, a labelled diagram, or a situation described in the NCERT chapter.
Explanation
Case-based items recycle a short story. Pull the fact out first, then apply it. This is original practice in CBSE case style — not a copied board paper.
Meta
Class: Class 9 · Subject: Science · Chapter: Atoms and Molecules · Original GKSchools practice (NCERT-aligned, not an official CBSE paper).
Q70Case Based4 marksModerate
A student is revising Atoms and Molecules and notes: “Chemical formula uses symbols and valency.” Using this case, answer: (i) Name the idea. (ii) State it in your own words. (iii) Give one classroom or daily-life use.
Answer
(i) Atoms and Molecules.
(ii) Chemical formula uses symbols and valency.
(iii) Apply it in a school experiment, a labelled diagram, or a situation described in the NCERT chapter.
Explanation
Case-based items recycle a short story. Pull the fact out first, then apply it. This is original practice in CBSE case style — not a copied board paper.
Meta
Class: Class 9 · Subject: Science · Chapter: Atoms and Molecules · Original GKSchools practice (NCERT-aligned, not an official CBSE paper).
Q71Case Based4 marksModerate
A student is revising Atoms and Molecules and notes: “Atoms and Molecules is an NCERT chapter taught in CBSE Class 9 Science.” Using this case, answer: (i) Name the idea. (ii) State it in your own words. (iii) Give one classroom or daily-life use.
Answer
(i) Atoms and Molecules.
(ii) Atoms and Molecules is an NCERT chapter taught in CBSE Class 9 Science.
(iii) Apply it in a school experiment, a labelled diagram, or a situation described in the NCERT chapter.
Explanation
Case-based items recycle a short story. Pull the fact out first, then apply it. This is original practice in CBSE case style — not a copied board paper.
Meta
Class: Class 9 · Subject: Science · Chapter: Atoms and Molecules · Original GKSchools practice (NCERT-aligned, not an official CBSE paper).
Q72Case Based4 marksDifficult
A student is revising Atoms and Molecules and notes: “Read the definitions, diagrams and solved examples in the NCERT textbook before practising extra questions.” Using this case, answer: (i) Name the idea. (ii) State it in your own words. (iii) Give one classroom or daily-life use.
Answer
(i) Textbook first.
(ii) Read the definitions, diagrams and solved examples in the NCERT textbook before practising extra questions.
(iii) Apply it in a school experiment, a labelled diagram, or a situation described in the NCERT chapter.
Explanation
Case-based items recycle a short story. Pull the fact out first, then apply it. This is original practice in CBSE case style — not a copied board paper.
Meta
Class: Class 9 · Subject: Science · Chapter: Atoms and Molecules · Original GKSchools practice (NCERT-aligned, not an official CBSE paper).
Q73Case Based4 marksModerateRevision pick
A student is revising Atoms and Molecules and notes: “Every chapter ends with keywords or a summary that is useful for one-mark answers.” Using this case, answer: (i) Name the idea. (ii) State it in your own words. (iii) Give one classroom or daily-life use.
Answer
(i) Keywords.
(ii) Every chapter ends with keywords or a summary that is useful for one-mark answers.
(iii) Apply it in a school experiment, a labelled diagram, or a situation described in the NCERT chapter.
Explanation
Case-based items recycle a short story. Pull the fact out first, then apply it. This is original practice in CBSE case style — not a copied board paper.
Meta
Class: Class 9 · Subject: Science · Chapter: Atoms and Molecules · Original GKSchools practice (NCERT-aligned, not an official CBSE paper).
Q74Case Based4 marksModerate
A student is revising Atoms and Molecules and notes: “CBSE often tests a concept by asking a daily-life example from the same chapter.” Using this case, answer: (i) Name the idea. (ii) State it in your own words. (iii) Give one classroom or daily-life use.
Answer
(i) Examples.
(ii) CBSE often tests a concept by asking a daily-life example from the same chapter.
(iii) Apply it in a school experiment, a labelled diagram, or a situation described in the NCERT chapter.
Explanation
Case-based items recycle a short story. Pull the fact out first, then apply it. This is original practice in CBSE case style — not a copied board paper.
Meta
Class: Class 9 · Subject: Science · Chapter: Atoms and Molecules · Original GKSchools practice (NCERT-aligned, not an official CBSE paper).
Q75Case Based4 marksModerate
A student is revising Atoms and Molecules and notes: “If the chapter has a diagram, practise labelling it — many school tests ask for labelled figures.” Using this case, answer: (i) Name the idea. (ii) State it in your own words. (iii) Give one classroom or daily-life use.
Answer
(i) Diagrams.
(ii) If the chapter has a diagram, practise labelling it — many school tests ask for labelled figures.
(iii) Apply it in a school experiment, a labelled diagram, or a situation described in the NCERT chapter.
Explanation
Case-based items recycle a short story. Pull the fact out first, then apply it. This is original practice in CBSE case style — not a copied board paper.
Meta
Class: Class 9 · Subject: Science · Chapter: Atoms and Molecules · Original GKSchools practice (NCERT-aligned, not an official CBSE paper).
Q76Case Based4 marksDifficult
A student is revising Atoms and Molecules and notes: “Write three points from Atoms and Molecules in your own words; that is enough for a short-answer start.” Using this case, answer: (i) Name the idea. (ii) State it in your own words. (iii) Give one classroom or daily-life use.
Answer
(i) Revision.
(ii) Write three points from Atoms and Molecules in your own words; that is enough for a short-answer start.
(iii) Apply it in a school experiment, a labelled diagram, or a situation described in the NCERT chapter.
Explanation
Case-based items recycle a short story. Pull the fact out first, then apply it. This is original practice in CBSE case style — not a copied board paper.
Meta
Class: Class 9 · Subject: Science · Chapter: Atoms and Molecules · Original GKSchools practice (NCERT-aligned, not an official CBSE paper).
Q77Competency Based3 marksModerateRevision pick
Competency practice: A classmate can recall the heading Accuracy but cannot explain it. How will you teach it in two steps using the textbook idea?
Answer
Step 1: State the fact — Use the terms used in the NCERT book; do not replace them with unofficial names. Step 2: Show one example or diagram from the chapter and ask the classmate to repeat it in their own words.
Explanation
Competency-based items check whether you can use a concept, not only name it. Teach-back is a simple way to prove understanding.
Meta
Class: Class 9 · Subject: Science · Chapter: Atoms and Molecules · Original GKSchools practice (NCERT-aligned, not an official CBSE paper).
Q78Competency Based3 marksDifficult
Competency practice: A classmate can recall the heading Practice but cannot explain it. How will you teach it in two steps using the textbook idea?
Answer
Step 1: State the fact — Mix MCQs with short answers so you remember both facts and explanations from Atoms and Molecules. Step 2: Show one example or diagram from the chapter and ask the classmate to repeat it in their own words.
Explanation
Competency-based items check whether you can use a concept, not only name it. Teach-back is a simple way to prove understanding.
Meta
Class: Class 9 · Subject: Science · Chapter: Atoms and Molecules · Original GKSchools practice (NCERT-aligned, not an official CBSE paper).
Q79Competency Based3 marksModerate
Competency practice: A classmate can recall the heading Atoms and Molecules but cannot explain it. How will you teach it in two steps using the textbook idea?
Answer
Step 1: State the fact — Law of conservation of mass. Step 2: Show one example or diagram from the chapter and ask the classmate to repeat it in their own words.
Explanation
Competency-based items check whether you can use a concept, not only name it. Teach-back is a simple way to prove understanding.
Meta
Class: Class 9 · Subject: Science · Chapter: Atoms and Molecules · Original GKSchools practice (NCERT-aligned, not an official CBSE paper).
Q80Competency Based3 marksModerate
Competency practice: A classmate can recall the heading Atoms and Molecules but cannot explain it. How will you teach it in two steps using the textbook idea?
Answer
Step 1: State the fact — Law of constant proportions. Step 2: Show one example or diagram from the chapter and ask the classmate to repeat it in their own words.
Explanation
Competency-based items check whether you can use a concept, not only name it. Teach-back is a simple way to prove understanding.
Meta
Class: Class 9 · Subject: Science · Chapter: Atoms and Molecules · Original GKSchools practice (NCERT-aligned, not an official CBSE paper).
Q81Competency Based3 marksDifficultRevision pick
Competency practice: A classmate can recall the heading Atoms and Molecules but cannot explain it. How will you teach it in two steps using the textbook idea?
Answer
Step 1: State the fact — Atom is the smallest unit of an element that takes part in a reaction as taught here. Step 2: Show one example or diagram from the chapter and ask the classmate to repeat it in their own words.
Explanation
Competency-based items check whether you can use a concept, not only name it. Teach-back is a simple way to prove understanding.
Meta
Class: Class 9 · Subject: Science · Chapter: Atoms and Molecules · Original GKSchools practice (NCERT-aligned, not an official CBSE paper).
Q82Competency Based3 marksModerate
Competency practice: A classmate can recall the heading Atoms and Molecules but cannot explain it. How will you teach it in two steps using the textbook idea?
Answer
Step 1: State the fact — Molecule of an element or compound. Step 2: Show one example or diagram from the chapter and ask the classmate to repeat it in their own words.
Explanation
Competency-based items check whether you can use a concept, not only name it. Teach-back is a simple way to prove understanding.
Meta
Class: Class 9 · Subject: Science · Chapter: Atoms and Molecules · Original GKSchools practice (NCERT-aligned, not an official CBSE paper).
Q83Competency Based3 marksModerate
Competency practice: A classmate can recall the heading Atoms and Molecules but cannot explain it. How will you teach it in two steps using the textbook idea?
Answer
Step 1: State the fact — Chemical formula uses symbols and valency. Step 2: Show one example or diagram from the chapter and ask the classmate to repeat it in their own words.
Explanation
Competency-based items check whether you can use a concept, not only name it. Teach-back is a simple way to prove understanding.
Meta
Class: Class 9 · Subject: Science · Chapter: Atoms and Molecules · Original GKSchools practice (NCERT-aligned, not an official CBSE paper).
Q84Competency Based3 marksDifficult
Competency practice: A classmate can recall the heading Atoms and Molecules but cannot explain it. How will you teach it in two steps using the textbook idea?
Answer
Step 1: State the fact — Atoms and Molecules is an NCERT chapter taught in CBSE Class 9 Science. Step 2: Show one example or diagram from the chapter and ask the classmate to repeat it in their own words.
Explanation
Competency-based items check whether you can use a concept, not only name it. Teach-back is a simple way to prove understanding.
Meta
Class: Class 9 · Subject: Science · Chapter: Atoms and Molecules · Original GKSchools practice (NCERT-aligned, not an official CBSE paper).
Q85Application Based3 marksModerate
Apply the idea of Textbook first to a real situation you might meet in school or daily life.
Answer
Read the definitions, diagrams and solved examples in the NCERT textbook before practising extra questions. Use this fact to explain a real object, habit, experiment or measurement from the chapter.
Explanation
Application questions reward a specific situation. Name the place (kitchen, playground, lab) and connect it to the fact.
Meta
Class: Class 9 · Subject: Science · Chapter: Atoms and Molecules · Original GKSchools practice (NCERT-aligned, not an official CBSE paper).
Q86Application Based3 marksModerate
Apply the idea of Keywords to a real situation you might meet in school or daily life.
Answer
Every chapter ends with keywords or a summary that is useful for one-mark answers. Use this fact to explain a real object, habit, experiment or measurement from the chapter.
Explanation
Application questions reward a specific situation. Name the place (kitchen, playground, lab) and connect it to the fact.
Meta
Class: Class 9 · Subject: Science · Chapter: Atoms and Molecules · Original GKSchools practice (NCERT-aligned, not an official CBSE paper).
Q87Application Based3 marksModerate
Apply the idea of Examples to a real situation you might meet in school or daily life.
Answer
CBSE often tests a concept by asking a daily-life example from the same chapter. Use this fact to explain a real object, habit, experiment or measurement from the chapter.
Explanation
Application questions reward a specific situation. Name the place (kitchen, playground, lab) and connect it to the fact.
Meta
Class: Class 9 · Subject: Science · Chapter: Atoms and Molecules · Original GKSchools practice (NCERT-aligned, not an official CBSE paper).
Q88Application Based3 marksDifficult
Apply the idea of Diagrams to a real situation you might meet in school or daily life.
Answer
If the chapter has a diagram, practise labelling it — many school tests ask for labelled figures. Use this fact to explain a real object, habit, experiment or measurement from the chapter.
Explanation
Application questions reward a specific situation. Name the place (kitchen, playground, lab) and connect it to the fact.
Meta
Class: Class 9 · Subject: Science · Chapter: Atoms and Molecules · Original GKSchools practice (NCERT-aligned, not an official CBSE paper).
Q89Application Based3 marksModerate
Apply the idea of Revision to a real situation you might meet in school or daily life.
Answer
Write three points from Atoms and Molecules in your own words; that is enough for a short-answer start. Use this fact to explain a real object, habit, experiment or measurement from the chapter.
Explanation
Application questions reward a specific situation. Name the place (kitchen, playground, lab) and connect it to the fact.
Meta
Class: Class 9 · Subject: Science · Chapter: Atoms and Molecules · Original GKSchools practice (NCERT-aligned, not an official CBSE paper).
Q90Application Based3 marksModerate
Apply the idea of Accuracy to a real situation you might meet in school or daily life.
Answer
Use the terms used in the NCERT book; do not replace them with unofficial names. Use this fact to explain a real object, habit, experiment or measurement from the chapter.
Explanation
Application questions reward a specific situation. Name the place (kitchen, playground, lab) and connect it to the fact.
Meta
Class: Class 9 · Subject: Science · Chapter: Atoms and Molecules · Original GKSchools practice (NCERT-aligned, not an official CBSE paper).
Q91HOTS3 marksModerate
HOTS: If someone ignored the idea “Mix MCQs with short answers so you remember both facts and explanations from Atoms and Molecules”, what mistake could they make while solving a question from Atoms and Molecules?
Answer
They would use the wrong term or the reverse relation. Remember: Mix MCQs with short answers so you remember both facts and explanations from Atoms and Molecules. Always check the NCERT definition before jumping to a formula or a long explanation.
Explanation
HOTS items ask you to predict an error. That is still chapter revision — not a claim that this exact wording will appear in the board exam.
Meta
Class: Class 9 · Subject: Science · Chapter: Atoms and Molecules · Original GKSchools practice (NCERT-aligned, not an official CBSE paper).
Q92HOTS3 marksModerate
HOTS: If someone ignored the idea “Law of conservation of mass”, what mistake could they make while solving a question from Atoms and Molecules?
Answer
They would use the wrong term or the reverse relation. Remember: Law of conservation of mass. Always check the NCERT definition before jumping to a formula or a long explanation.
Explanation
HOTS items ask you to predict an error. That is still chapter revision — not a claim that this exact wording will appear in the board exam.
Meta
Class: Class 9 · Subject: Science · Chapter: Atoms and Molecules · Original GKSchools practice (NCERT-aligned, not an official CBSE paper).
Q93HOTS3 marksDifficultRevision pick
HOTS: If someone ignored the idea “Law of constant proportions”, what mistake could they make while solving a question from Atoms and Molecules?
Answer
They would use the wrong term or the reverse relation. Remember: Law of constant proportions. Always check the NCERT definition before jumping to a formula or a long explanation.
Explanation
HOTS items ask you to predict an error. That is still chapter revision — not a claim that this exact wording will appear in the board exam.
Meta
Class: Class 9 · Subject: Science · Chapter: Atoms and Molecules · Original GKSchools practice (NCERT-aligned, not an official CBSE paper).
Q94HOTS3 marksModerate
HOTS: If someone ignored the idea “Atom is the smallest unit of an element that takes part in a reaction as taught here”, what mistake could they make while solving a question from Atoms and Molecules?
Answer
They would use the wrong term or the reverse relation. Remember: Atom is the smallest unit of an element that takes part in a reaction as taught here. Always check the NCERT definition before jumping to a formula or a long explanation.
Explanation
HOTS items ask you to predict an error. That is still chapter revision — not a claim that this exact wording will appear in the board exam.
Meta
Class: Class 9 · Subject: Science · Chapter: Atoms and Molecules · Original GKSchools practice (NCERT-aligned, not an official CBSE paper).
Q95HOTS3 marksModerate
HOTS: If someone ignored the idea “Molecule of an element or compound”, what mistake could they make while solving a question from Atoms and Molecules?
Answer
They would use the wrong term or the reverse relation. Remember: Molecule of an element or compound. Always check the NCERT definition before jumping to a formula or a long explanation.
Explanation
HOTS items ask you to predict an error. That is still chapter revision — not a claim that this exact wording will appear in the board exam.
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Class: Class 9 · Subject: Science · Chapter: Atoms and Molecules · Original GKSchools practice (NCERT-aligned, not an official CBSE paper).
Q96HOTS3 marksDifficult
HOTS: If someone ignored the idea “Chemical formula uses symbols and valency”, what mistake could they make while solving a question from Atoms and Molecules?
Answer
They would use the wrong term or the reverse relation. Remember: Chemical formula uses symbols and valency. Always check the NCERT definition before jumping to a formula or a long explanation.
Explanation
HOTS items ask you to predict an error. That is still chapter revision — not a claim that this exact wording will appear in the board exam.
Meta
Class: Class 9 · Subject: Science · Chapter: Atoms and Molecules · Original GKSchools practice (NCERT-aligned, not an official CBSE paper).
Q97NCERT-style2 marksModerate
NCERT-style exercise: In your own words, write what the chapter teaches about Atoms and Molecules.
Answer
Atoms and Molecules is an NCERT chapter taught in CBSE Class 9 Science. Keep the answer as short as the in-text questions in the textbook.
Explanation
This is original practice in the style of NCERT in-text/exercise questions. It is not copied from any solutions website.
Meta
Class: Class 9 · Subject: Science · Chapter: Atoms and Molecules · Original GKSchools practice (NCERT-aligned, not an official CBSE paper).
Q98NCERT-style2 marksModerate
NCERT-style exercise: In your own words, write what the chapter teaches about Textbook first.
Answer
Read the definitions, diagrams and solved examples in the NCERT textbook before practising extra questions. Keep the answer as short as the in-text questions in the textbook.
Explanation
This is original practice in the style of NCERT in-text/exercise questions. It is not copied from any solutions website.
Meta
Class: Class 9 · Subject: Science · Chapter: Atoms and Molecules · Original GKSchools practice (NCERT-aligned, not an official CBSE paper).
Q99NCERT-style2 marksModerate
NCERT-style exercise: In your own words, write what the chapter teaches about Keywords.
Answer
Every chapter ends with keywords or a summary that is useful for one-mark answers. Keep the answer as short as the in-text questions in the textbook.
Explanation
This is original practice in the style of NCERT in-text/exercise questions. It is not copied from any solutions website.
Meta
Class: Class 9 · Subject: Science · Chapter: Atoms and Molecules · Original GKSchools practice (NCERT-aligned, not an official CBSE paper).
Q100NCERT-style2 marksDifficult
NCERT-style exercise: In your own words, write what the chapter teaches about Examples.
Answer
CBSE often tests a concept by asking a daily-life example from the same chapter. Keep the answer as short as the in-text questions in the textbook.
Explanation
This is original practice in the style of NCERT in-text/exercise questions. It is not copied from any solutions website.
Meta
Class: Class 9 · Subject: Science · Chapter: Atoms and Molecules · Original GKSchools practice (NCERT-aligned, not an official CBSE paper).
FAQs
Are these official CBSE board questions?
No. They are original practice questions aligned to NCERT topics used in CBSE classrooms. Official sample papers are published on cbseacademic.nic.in.
Will these questions appear in the board exam?
Nobody can promise a question. Use them for revision of frequently tested concepts and exam-style practice.
Is the chapter list the latest NCERT list?
Yes, the catalog follows current NCERT textbooks used in CBSE schools (including new middle-stage books such as Ganita Prakash and Curiosity). Always match the book issued by your school.
How should I use the 100 questions?
Try the question first, then tap Show answer. Mix MCQs with long answers. Revise formulas and diagrams from the textbook alongside this set.
Where are NCERT solutions?
Open the NCERT-style practice link on this subject or chapter. For word-for-word textbook exercise answers, use the NCERT book itself; we do not copy solution keys from other websites.
What is the suggested URL pattern?
Hub /cbse/, then /cbse/class-9/, then subject and chapter slugs.
Why is this a separate URL?
So students searching for “Important Formulas” land on a filtered set, while the chapter page remains the full 100-question bank. Same facts, different search intent.
Today's 3-step path
Follow this loop every day: mixed test, current affairs, then today's subject. A new set arrives tomorrow.
