Digital Logic Circuits and Discrete Mathematical Structures Topic Wise Pyq

21. The translation from symbolic program into binary is done in:
Symbolic program को binary में किसमें बदला जाता है?
(UKPSC PGT C.S. Asstt. Prof. 2017)
A. Two passes
B. Directly
C. Three passes
D. Four passes

Correct Answer: A

Explanation (EN): Symbolic program means Assembly language. It is converted into machine (binary) language using an Assembler. Most assemblers work in two passes: 1. First pass → builds symbol table 2. Second pass → generates machine code

Explanation (HI): Symbolic program का अर्थ Assembly language होता है। इसे binary (machine language) में बदलने के लिए Assembler का उपयोग होता है। अधिकांश assembler two-pass method पर काम करते हैं: 1. पहला pass → symbol table बनाता है 2. दूसरा pass → machine code बनाता है

22. What will be binary equivalent of 562₈?
562₈ का binary equivalent क्या होगा?
(HTET PGT C.S. 2025)
A. 101110010₂
B. 101100010₂
C. 111110010₂
D. 101110011₂

Correct Answer: A

Explanation (EN): Each octal digit corresponds to 3 binary bits 5 → 101 6 → 110 2 → 010 Combine → 101110010₂

Explanation (HI): हर octal digit को 3-bit binary में बदलते हैं: 5 → 101 6 → 110 2 → 010 इन्हें जोड़ने पर → 101110010₂

23. What will be binary equivalent of 2AB₁₆?
2AB₁₆ का binary equivalent क्या होगा?
(HTET PGT C.S. 2025)
A. 1011101011₂
B. 1110101011₂
C. 1000101011₂
D. 1010101011₂

Correct Answer: D

Explanation (EN): Each hex digit = 4-bit binary 2 → 0010 A → 1010 B → 1011 Combine → 001010101011 → remove leading zeros Final = 1010101011₂

Explanation (HI): हर hexadecimal digit = 4-bit binary होता है 2 → 0010 A → 1010 B → 1011 जोड़ने पर → 001010101011 leading zero हटाकर → 1010101011₂

24. To convert a Gray Code to binary, which technique is used?
Gray code को binary में बदलने के लिए कौन-सी तकनीक उपयोग होती है?
(Bihar STET C.S. 2023)
A. Subtraction
B. Addition
C. XOR operation
D. Division

Correct Answer: C

Explanation (EN): Conversion rule: • MSB same रहता है • बाकी bits → previous binary bit XOR current Gray bit Example: Gray = 1011 → Binary = 1110

Explanation (HI): Gray से binary conversion में: • पहला bit same रहता है • बाकी bits = previous binary bit XOR current Gray bit उदाहरण: Gray = 1011 → Binary = 1110

25. The octal equivalent of 111010₂ is:
111010₂ का octal equivalent क्या है?
(Bihar STET C.S. 2020)
A. 81
B. 72
C. 81
D. None

Correct Answer: B

Explanation (EN): Group into 3 bits: 111 010 111 = 7 010 = 2 So result = 72₈

Explanation (HI): 3-3 bits में समूह बनाते हैं: 111 010 111 = 7 010 = 2 अतः उत्तर = 72₈

26. ASCII and EBCDIC are popular coding systems. What does EBCDIC stand for?
EBCDIC का full form क्या है?
(Bihar STET C.S. 2019)
A. Extended Binary Coded Decimal Interchange Code
B. Extended Bit Code Decimal Interchange Code
C. Extended Bit Case Decimal Interchange Code
D. Extended Binary Case Decimal Interchange Code

Correct Answer: A

Explanation (EN): EBCDIC stands for Extended Binary Coded Decimal Interchange Code

Explanation (HI): EBCDIC का पूरा नाम Extended Binary Coded Decimal Interchange Code है।

27. The hexadecimal number F4 is equivalent to which binary number?
F4₁₆ का binary equivalent क्या है?
(Bihar STET C.S. 2023)
A. 11111001
B. 11110100
C. 11111100
D. 11111010

Correct Answer: B

Explanation (EN): F = 15 → 1111 4 → 0100 Combine → 11110100₂

Explanation (HI): F = 15 → 1111 4 → 0100 जोड़ने पर → 11110100₂

28. Which is exact octal equivalent of (101110001011)₂?
(101110001011)₂ का सही octal equivalent क्या है?
(KVS PGT 2023)
A. (232023)₈
B. (A8A)₈
C. (5613)₈
D. (3165)₈

Correct Answer: C

Explanation (EN): Group into 3 bits: 101 110 001 011 → 5 6 1 3 So answer = 5613₈

Explanation (HI): 3-3 bits में समूह बनाते हैं: 101 110 001 011 → 5 6 1 3 अतः उत्तर = 5613₈

29. What is full form of ISCII encoding scheme?
ISCII का full form क्या है?
(KVS PGT 2023)
A. Indian Standard Code for Interchange of Information
B. Indian Standard Code for Information Interchange
C. Indian Standard Coding for Information
D. Indian Scheme of Coding

Correct Answer: B

Explanation (EN): ISCII stands for Indian Standard Code for Information Interchange

Explanation (HI): ISCII का पूरा नाम Indian Standard Code for Information Interchange है।

30. Accuracy of floating point numbers in two 16-bit words is approximately:
दो 16-bit words में floating point numbers की accuracy लगभग कितनी होती है?
(Bihar STET C.S. 2020)
A. 16 digits
B. 6 digits
C. 9 digits
D. All

Correct Answer: B

Explanation (EN): 32-bit floating point has about 6–7 decimal digits precision So approx answer = 6 digits

Explanation (HI): 32-bit floating point representation में लगभग 6–7 decimal digits की accuracy होती है। इसलिए उत्तर = 6 digits