UGC NET · PAPER 2
UGC NET Paper 2 Computer Science – Unit 2: Computer System Architecture PYQ (December 2022 Shift 1)
Q5. In 16-bit 2's complement representation, the decimal number −28 is
- 1111 1111 0001 1100
- 1111 1111 1111 0100
- 1111 1111 1110 0100
- 1111 1111 1110 0011
Q6. Simplify using a K-map: F(A, B, C, D) = Σm(3, 4, 5, 6, 7, 11, 15)
- AB + C′D
- A′B + CD
- AC + BD
- A′B + B′C
Q7. A 3-bit synchronous counter uses T flip-flops P, Q, R (all clocked together) with inputs T_P = R, T_Q = P′ and T_R = Q′. If the initial state PQR is 000, what are the next three states?
- 011, 101, 000
- 001, 010, 111
- 011, 101, 111
- 001, 010, 000
Q8. Let R1 and R2 be two 4-bit registers that store numbers in 2's complement form. For the operation R1 + R2, which values of R1 and R2 give an arithmetic overflow?
- R1 = 1011 and R2 = 1110
- R1 = 1100 and R2 = 1010
- R1 = 0011 and R2 = 0100
- R1 = 1001 and R2 = 1111
Q44. Consider the Boolean expression F = (X + Y + Z)(X′ + Y)(Y′ + Z). Which of the following Boolean expressions is/are equivalent to F′ (the complement of F)?
A. (X′ + Y′ + Z′)(X + Y′)(Y + Z′)
B. XY′ + Z′
C. (X + Z′)(Y′ + Z′)
D. XY′ + YZ′ + X′Y′Z′
Choose the correct answer from the options given below:
A. (X′ + Y′ + Z′)(X + Y′)(Y + Z′)
B. XY′ + Z′
C. (X + Z′)(Y′ + Z′)
D. XY′ + YZ′ + X′Y′Z′
Choose the correct answer from the options given below:
- A, B and C Only
- B, C and D Only
- A, C and D Only
- A, B and D Only
Q45. Which of the following statements is/are true?
A. The processor has direct access to both primary and secondary memory.
B. Primary memory stores the active instructions and data of the program being executed.
C. Secondary memory is used as backup memory.
D. The memory system is implemented as a single-level memory.
Choose the correct answer from the options given below:
A. The processor has direct access to both primary and secondary memory.
B. Primary memory stores the active instructions and data of the program being executed.
C. Secondary memory is used as backup memory.
D. The memory system is implemented as a single-level memory.
Choose the correct answer from the options given below:
- A and B only
- B and C only
- A, B and C only
- A and D only
Q67. Match List I (8085 instructions) with List II
| List I | List II |
|---|---|
| A. DAA | I. Program Control Instruction |
| B. LXI | II. Interrupt instruction |
| C. RST | III. Data Movement Instruction |
| D. JMP | IV. Arithmetic Instruction |
- A-IV, B-II, C-I, D-III
- A-IV, B-III, C-II, D-I
- A-IV, B-II, C-III, D-I
- A-III, B-IV, C-II, D-I
Q77. The sequence of events during a typical instruction fetch is:
A. Memory
B. MBR
C. MAR
D. PC
E. IR
Choose the correct order from the options given below:
A. Memory
B. MBR
C. MAR
D. PC
E. IR
Choose the correct order from the options given below:
- A, B, C, D, E
- D, C, A, B, E
- E, D, C, B, A
- D, C, A, E, B