PU CET Lahore (Engineering & CS): computer science MCQs with Answers

Question 1

What is the Hamming distance between 1001 and 1101?

Accepted Answer

1

Answer

2

Answer

3

Answer

4

Question 2

What is the output of `printf('%d', sizeof(char));`?

Accepted Answer

1

Answer

2

Answer

4

Answer

Depends on the system

Question 3

What is the main advantage of using a Harvard architecture over a von Neumann architecture?

Accepted Answer

Faster execution due to separate instruction and data buses

Answer

Simplified instruction decoding

Answer

Improved memory utilization

Answer

Reduced CPU complexity

Question 4

In a pipelined processor, what is the primary function of the 'IF' stage?

Accepted Answer

Instruction Fetch

Answer

Instruction Decode

Answer

Execution

Answer

Memory Access

Question 5

What is the purpose of the 'TLB' in a virtual memory system?

Accepted Answer

To cache translation of virtual to physical addresses

Answer

To cache frequently accessed instructions

Answer

To cache frequently accessed data

Answer

To cache page tables

Question 6

What is the main benefit of out-of-order execution in a processor?

Accepted Answer

Improved instruction-level parallelism

Answer

Simplified instruction decoding

Answer

Reduced power consumption

Answer

Increased cache hits

Question 7

Which of the following cache replacement policies is based on the least recently used block?

Accepted Answer

LRU

Answer

FIFO

Answer

Random

Answer

Optimal

Question 8

What is the primary function of the 'ID' stage in a pipelined processor?

Accepted Answer

Instruction Decode

Answer

Instruction Fetch

Answer

Execution

Answer

Memory Access

Question 9

In a virtual memory system, what is the purpose of the 'page table'?

Accepted Answer

To store the mapping of virtual to physical addresses

Answer

To store the page frames in main memory

Answer

To store the page replacement policy

Answer

To store the page fault handler

Question 10

What is the main advantage of using a multi-core processor?

Accepted Answer

Better multithreading support

Answer

Improved single-threaded performance

Answer

Increased instruction-level parallelism

Answer

Reduced power consumption

Question 11

Which of the following is a characteristic of a CISC (Complex Instruction Set Computer) architecture?

Accepted Answer

Microcode-based instruction execution

Answer

Load/store architecture

Answer

Simple instruction set

Answer

Fixed-length instructions

Question 12

What is the purpose of the 'branch predictor' in a processor?

Accepted Answer

To predict the outcome of a branch instruction

Answer

To predict the target address of a branch instruction

Answer

To predict the instruction fetch sequence

Answer

To predict the data access pattern

Question 13

In a pipelined processor, what is the effect of a 'stall' or 'bubble'?

Accepted Answer

It reduces the instruction-level parallelism

Answer

It increases the instruction-level parallelism

Answer

It improves the branch prediction accuracy

Answer

It reduces the cache miss rate

Question 14

What is the primary function of the 'MEM' stage in a pipelined processor?

Accepted Answer

Memory Access

Answer

Instruction Fetch

Answer

Instruction Decode

Answer

Execution

Question 15

Which of the following is a type of parallelism that involves executing multiple threads or processes simultaneously?

Accepted Answer

Thread-level parallelism

Answer

Instruction-level parallelism

Answer

Data parallelism

Answer

Pipelining