The binary number system uses digits
- A. 0–9
- B. 0 and 1
- C. A–F only
- D. 1–8
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Correct option: B — 0 and 1
Each place is a power of 2.
Class 9 · कंप्यूटर · 255+ Q&A
Class 9 Computer — Number System Important Questions with Answers
IT basics, hardware, software, internet safety and MS Office for Class 9. Showing 20 of 21 on page 1 / 2.
- अध्याय चुनें
- MCQ टेस्ट दें — उत्तर पहले छिपा है
- View answer से मिलाएँ
- अगला पेज · एक स्क्रीन पर 20 प्रश्न
All chapters
1. Hardware
2. Software
3. Operating System
4. Memory and Storage
5. Input and Output
6. Networking
7. Internet and Email
8. Cyber Safety
9. MS Office
10. Number System
11. IPR and Digital Ethics
Page 1 of 2 · 21 questions in this view
Decimal 5 in binary is
- A. 100
- B. 101
- C. 111
- D. 110
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Correct option: B — 101
4+1 = 5 → 101.
Binary 1101 in decimal is
- A. 11
- B. 13
- C. 8
- D. 15
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Correct option: B — 13
8+4+1 = 13.
One byte can represent how many distinct values?
- A. 8
- B. 256
- C. 1024
- D. 2
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Correct option: B — 256
2^8 = 256 (0 to 255).
ASCII is used to
- A. cool laptops
- B. code characters as numbers
- C. measure UPS watts
- D. draw fibre maps
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Correct option: B — code characters as numbers
A letter becomes a code the computer can store.
Hexadecimal uses base
- A. 2
- B. 8
- C. 10
- D. 16
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Correct option: D — 16
Digits 0–9 and A–F; often shown for colours and memory.
Octal system base is
- A. 2
- B. 8
- C. 10
- D. 16
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Correct option: B — 8
Digits 0–7.
LSB means
- A. Large Software Bundle
- B. Least Significant Bit
- C. Local School Browser
- D. Long Slide Bar
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Correct option: B — Least Significant Bit
The rightmost bit in the usual writing of a binary number.
Decimal 8 in binary is
- A. 1000
- B. 1001
- C. 111
- D. 1010
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Correct option: A — 1000
2^3 = 8 → 1000.
Binary 10000 in decimal is
- A. 8
- B. 16
- C. 32
- D. 10
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Correct option: B — 16
2^4 = 16.
The place values in binary from right are
- A. 1, 2, 4, 8, 16, …
- B. 1, 10, 100
- C. 1, 8, 64
- D. 1, 16, 256 only
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Correct option: A — 1, 2, 4, 8, 16, …
Powers of two.
Convert decimal 2 to binary.
- A. 10
- B. 11
- C. 01 as the only 2-bit? 10 is 2
- D. 100
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Correct option: A — 10
2 = 10 in binary.
How many bits in 2 bytes?
- A. 2
- B. 8
- C. 16
- D. 1024
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Correct option: C — 16
2 × 8 = 16 bits.
MSB is the
- A. middle school book
- B. Most Significant Bit — usually the leftmost
- C. mail server box
- D. macro start button
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Correct option: B — Most Significant Bit — usually the leftmost
Opposite of LSB.
Convert decimal 13 to binary and show steps.
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13 ÷ 2 = 6 remainder 1, 6 ÷ 2 = 3 r 0, 3 ÷ 2 = 1 r 1, 1 ÷ 2 = 0 r 1. Remainders upward: 1101. Check: 8+4+1=13. Write remainders from last to first.
Why do computers use binary?
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Electronic circuits easily show two states: on/off, high/low voltage. Two symbols 0 and 1 are enough to code numbers, text (ASCII/Unicode) and instructions. Binary is simple for hardware, even if long for humans.
Convert binary 10110 to decimal.
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Places from the right: 0×1 + 1×2 + 1×4 + 0×8 + 1×16 = 2+4+16 = 22. Write the weights 16 8 4 2 1 under the digits. Check by converting 22 back if time allows.
What is ASCII? Why is Unicode needed?
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ASCII maps English letters and control codes to numbers (e.g. ‘A’ is 65 in decimal). Unicode can represent Hindi and many scripts so Class 9 Hindi files display correctly. Encoding mismatch shows box characters.
Explain binary conversion both ways with two examples each.
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Decimal to binary: divide by 2, list remainders upwards. 13 → 1101; 8 → 1000. Binary to decimal: add powers of two where bits are 1. 10110 → 16+4+2 = 22; 101 → 4+1 = 5. Also state 1 byte = 8 bits = 256 values. Mention ASCII as character coding. Show working in a table of weights 16 8 4 2 1. Neat steps score more than the final digit alone.
Write a short lesson on number systems: decimal, binary, octal, hex.
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Decimal base 10 (0–9) is daily life. Binary base 2 (0,1) is machine language of bits. Octal base 8 (0–7) and hexadecimal base 16 (0–9,A–F) shorten long binary (each hex digit is 4 bits). Convert using division or place values. Example: decimal 15 is 1111 binary and F hex. Class 9 may only require binary–decimal; mention others if the syllabus lists them.
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Class 9 Computer में कितने प्रश्न हैं? 255 महत्वपूर्ण प्रश्न: 174 MCQ, 50 लघु, 31 दीर्घ।
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