Computer Systems and Organisation Quiz 3

✅ Answer: (c) Binary

The binary number system is base-2, meaning it uses only two digits — 0 and 1. It’s the native language of computer hardware, where each digit (bit) represents an “off” or “on” state.

✅ Answer: (a) 8

Octal is base-8, so it uses exactly 8 unique digits: 0 through 7.

✅ Answer: (c) 10

Decimal is the number system we use every day — it’s base-10, using digits 0 through 9.

✅ Answer: (d) Hexadecimal

Hexadecimal is base-16. Since only 10 digit symbols (0-9) exist, it borrows the letters A-F to represent values 10 through 15.

✅ Answer: (c) 42

101010₂ = (1×32)+(0×16)+(1×8)+(0×4)+(1×2)+(0×1) = 32+8+2 = 42.

✅ Answer: (b) 111010

Each octal digit maps to exactly 3 binary bits: 7 → 111, 2 → 010. Combined: 111010. (Note: some circulated answer keys for this question incorrectly mark “101101” — that value is wrong; 111010 is the verified correct conversion.)

✅ Answer: (c) 92

146 ÷ 16 = 9 remainder 2, so 146 in hex is 92. (This question is corrected from a version circulating with 147, which doesn’t match any of the given options — 147 in hex is actually 93.)

✅ Answer: (a) 101010

2 → 0010, A (=10) → 1010. Combined and trimmed: 101010.

✅ Answer: (a) ASCII

ASCII (as taught at this level) uses 8 bits per character, allowing 256 possible characters — enough for English letters, digits, and common symbols.

✅ Answer: (c) UTF8

UTF-8 is the dominant encoding on the modern web and in most software — it’s backward-compatible with ASCII but can represent virtually any character from any language.

✅ Answer: (a) 8

ASCII characters are represented using 8 bits (1 byte) each.

✅ Answer: (a) American Standard Code for Information Interchange

ASCII stands for American Standard Code for Information Interchange — one of the earliest character-encoding standards, still foundational today.

✅ Answer: (b) ISCII

ISCII (Indian Script Code for Information Interchange) was specifically developed to represent Indian language scripts like Devanagari, Tamil, and Bengali.

✅ Answer: (c) UTF8

UTF-8, as a Unicode encoding, can represent the entire Unicode character set — over 1.1 million possible code points, covering virtually every writing system in use today. (UTF-32 encodes the same Unicode repertoire too, but UTF-8 is the standard answer taught for this property since it’s the most widely deployed.)

✅ Answer: (a) 01000001

‘A’ has ASCII value 65. In 8-bit binary, 65 = 01000001.

✅ Answer: (d) E

1000101₂ = 69 in decimal, and ASCII value 69 corresponds to the character ‘E’. (Corrected from a widely circulated version of this question using “1100101”, which actually converts to 101 = lowercase ‘e’ — not among any of the given options.)

✅ Answer: (c) UTF8

UTF-8 is generally considered the most comprehensive and widely adopted encoding for representing text from virtually every writing system in the world, since it fully implements the Unicode standard.

✅ Answer: (d) UTF32

UTF-32 is fixed-width — every single character, regardless of complexity, is always stored using exactly 32 bits (4 bytes). This makes indexing simple but uses more memory than UTF-8.

✅ Answer: (c) 11001101

C (=12) → 1100, D (=13) → 1101. Combined: 11001101. (Corrected from a version of this question using “1F5”, which needs 9 bits and doesn’t match any 8-bit option given.)

✅ Answer: (c) 72

58 ÷ 8 = 7 remainder 2, so 58 in octal is 72.