Central Board of Secondary Education
Practice Question Paper — not an official CBSE document
Subject Code 086 · Set 3 of 3
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.
Life processes, control, reproduction, heredity, environment · Q1–16 · 30 marks · 30 marks
D. Dominant and recessive
NoteDominant and recessive. The other options mix ideas from nearby topics or reverse the textbook fact.
A. Acquired traits are not passed genetically in Mendelian sense
NoteAcquired traits are not passed genetically in Mendelian sense. The other options mix ideas from nearby topics or reverse the textbook fact.
D. Every chapter ends with keywords or a summary that is useful for one-mark answers
NoteEvery 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.
C. Write three points from Heredity in your own words; that is enough for a short-answer start
NoteWrite three points from Heredity 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.
C. Mendel’s monohybrid 3:1 in F2
NoteMendel’s monohybrid 3:1 in F2. The other options mix ideas from nearby topics or reverse the textbook fact.
B. Human sex: XX female, XY male
NoteHuman sex: XX female, XY male. The other options mix ideas from nearby topics or reverse the textbook fact.
C. Read the definitions, diagrams and solved examples in the NCERT textbook before practising extra questions
NoteRead 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.
A. Both A and R are true, and R is the correct explanation of A.
NoteRead Assertion and Reason separately first. Here both match the textbook idea, and R explains why A is taught in this chapter.
A. Both A and R are true, and R is the correct explanation of A.
NoteRead Assertion and Reason separately first. Here both match the textbook idea, and R explains why A is taught in this chapter.
1. Genes are located on chromosomes as taught.
2. Keep the NCERT wording and add one daily-life example from the same chapter.
Two-mark answers work best as two numbered points. One definition plus one example is usually enough.
1. Heredity is an NCERT chapter taught in CBSE Class 10 Science.
2. Keep the NCERT wording and add one daily-life example from the same chapter.
Two-mark answers work best as two numbered points. One definition plus one example is usually enough.
OR
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.
Two-mark answers work best as two numbered points. One definition plus one example is usually enough.
OR — marking points1. 10% law of energy transfer as taught.
2. Keep the NCERT wording and add one daily-life example from the same chapter.
Use the terms used in the NCERT book; do not replace them with unofficial names. Example: Use a situation from the NCERT activity or a labelled diagram in this chapter.
NoteThree-mark questions want a short explanation, not a full essay. Link the idea to a figure or an activity.
Dominant and recessive. Example: Use a situation from the NCERT activity or a labelled diagram in this chapter.
NoteThree-mark questions want a short explanation, not a full essay. Link the idea to a figure or an activity.
(i) Heredity.
(ii) Acquired traits are not passed genetically in Mendelian sense.
(iii) Apply it in a school experiment, a labelled diagram, or a situation described in the NCERT chapter.
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.
OR
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.
NoteLong answers are marked for structure. Use headings or numbered steps so the examiner can see each part.
OR — marking pointsOur Environment — Producers → consumers → decomposers. Explain the idea in order (definition → working → result). End with one application from daily life or a numerical/diagram if the chapter has one.
Reactions, acids–bases, metals, carbon · Q17–29 · 25 marks · 25 marks
C. Write three points from Metals and Non-metals in your own words; that is enough for a short-answer start
NoteWrite three points from Metals and Non-metals 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.
D. Carbon forms four covalent bonds
NoteCarbon forms four covalent bonds. The other options mix ideas from nearby topics or reverse the textbook fact.
D. A more reactive metal can displace a less reactive metal from its salt solution
NoteA more reactive metal can displace a less reactive metal from its salt solution. The other options mix ideas from nearby topics or reverse the textbook fact.
A. Read the definitions, diagrams and solved examples in the NCERT textbook before practising extra questions
NoteRead 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.
C. If the chapter has a diagram, practise labelling it — many school tests ask for labelled figures
NoteIf 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.
A. Mix MCQs with short answers so you remember both facts and explanations from Carbon and its Compounds
NoteMix MCQs with short answers so you remember both facts and explanations from Carbon and its Compounds. The other options mix ideas from nearby topics or reverse the textbook fact.
C. A decomposition reaction splits one compound into two or more products, often with heat, light or electricity
NoteA decomposition reaction splits one compound into two or more products, often with heat, light or electricity. The other options mix ideas from nearby topics or reverse the textbook fact.
A. Both A and R are true, and R is the correct explanation of A.
NoteRead Assertion and Reason separately first. Here both match the textbook idea, and R explains why A is taught in this chapter.
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.
Two-mark answers work best as two numbered points. One definition plus one example is usually enough.
Use the terms used in the NCERT book; do not replace them with unofficial names. Example: Use a situation from the NCERT activity or a labelled diagram in this chapter.
NoteThree-mark questions want a short explanation, not a full essay. Link the idea to a figure or an activity.
OR
In a combination reaction two or more substances join to form a single product. Example: CaO + H2O → Ca(OH)2
NoteThree-mark questions want a short explanation, not a full essay. Link the idea to a figure or an activity.
OR — marking pointsEvery 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.
(i) Acids, Bases and Salts.
(ii) Washing soda, baking soda, plaster of Paris, bleaching powder uses.
(iii) Apply it in a school experiment, a labelled diagram, or a situation described in the NCERT chapter.
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.
OR
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.
NoteLong answers are marked for structure. Use headings or numbered steps so the examiner can see each part.
OR — marking pointsAcids, Bases and Salts — Acids produce H+ in water. Explain the idea in order (definition → working → result). End with one application from daily life or a numerical/diagram if the chapter has one.
Light, human eye, electricity, magnetism · Q30–39 · 25 marks · 25 marks
A. Write three points from Magnetic Effects of Electric Current in your own words; that is enough for a short-answer start
NoteWrite three points from Magnetic Effects of Electric Current 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.
B. Laws of reflection
NoteLaws of reflection. The other options mix ideas from nearby topics or reverse the textbook fact.
A. Both A and R are true, and R is the correct explanation of A.
NoteRead Assertion and Reason separately first. Here both match the textbook idea, and R explains why A is taught in this chapter.
1. One kilowatt-hour is the energy used by 1 kW in 1 hour, equal to 3.6 × 10⁶ J.
2. Keep the NCERT wording and add one daily-life example from the same chapter.
Two-mark answers work best as two numbered points. One definition plus one example is usually enough.
OR
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.
Two-mark answers work best as two numbered points. One definition plus one example is usually enough.
OR — marking points1. Resistance of a conductor R = ρl/A.
2. Keep the NCERT wording and add one daily-life example from the same chapter.
Mix MCQs with short answers so you remember both facts and explanations from Light – Reflection and Refraction. Example: Use a situation from the NCERT activity or a labelled diagram in this chapter.
NoteThree-mark questions want a short explanation, not a full essay. Link the idea to a figure or an activity.
Hypermetropia: converging lens. Example: Use a situation from the NCERT activity or a labelled diagram in this chapter.
NoteThree-mark questions want a short explanation, not a full essay. Link the idea to a figure or an activity.
Electric power P = VI = I²R = V²/R. Example: Use a situation from the NCERT activity or a labelled diagram in this chapter.
NoteThree-mark questions want a short explanation, not a full essay. Link the idea to a figure or an activity.
(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.
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.
OR
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.
NoteLong answers are marked for structure. Use headings or numbered steps so the examiner can see each part.
OR — marking pointsMagnetic Effects of Electric Current — Live, neutral, earth in domestic wiring. Explain the idea in order (definition → working → result). End with one application from daily life or a numerical/diagram if the chapter has one.
*** End of paper ***
No. The layout (sections, question numbers, marks and time) follows the 2025-26 sample paper. The questions are original GKSchools practice.
MCQ, assertion–reason and reading MCQ parts are auto-scored when you submit. Written answers are for self-check against the key.
Download it from CBSE Academic: https://cbseacademic.nic.in/web_material/SQP/ClassX_2025_26/Science-SQP.pdf
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