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⇱ Quiz about Threads in Operating Systems

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Question 1

Consider the following two threads T1 and T2. Initially, a = b = 1. Each statement executes atomically.

Which lists all possible values of (a, b) after both threads finish?

( GATE 2020 | MCQ )

  • {(4,4)}

  • {(3,3), (4,4)}

  • {(3,3), (4,4), (3,4), (4,3)}

  • {(2,2), (2,4), (3,3), (3,4), (4,3), (4,4)}

Question 2

Threads are effective only if the CPU is:

  • Multi-core

  • Single-core

  • High speed

  • Idle

Question 3

Which of the following is shared among all threads in a process?

  • Stack

  • Program counter

  • Register set

  • Code section

Question 4

Which component is NOT unique to each thread?

  • Thread ID

  • Program Counter

  • Stack

  • Address space

Question 5

The OS data structure maintained for a thread includes:

( GATE 2016 | MCQ )

  • Page table, open file table, signal table

  • Program counter, register set, stack

  • Both (a) and (b)

  • Only PCB

Question 6

Which statement about threads is TRUE?

( GATE 2023 | MCQ )

  • Two threads of the same process cannot run simultaneously on a single-core CPU.

  • A thread can exist without a process.

  • Threads share address space but have separate stacks and program counters.

  • Switching threads of different processes is cheaper than within the same process.

Question 7

Which one of the following is FALSE?

( GATE 2014 | MCQ )

  • User-level threads are not scheduled by the kernel.

  • When a user-level thread is blocked, all threads of the process are blocked.

  • Context switching between user-level threads is faster than between kernel-level threads.

  • Kernel-level threads cannot share the code segment.

Question 8

Which of the following is FALSE?

( GATE 2002 | MCQ )

  • Context switching is slower for kernel-level threads than user-level threads.

  • Blocking one kernel-level thread blocks all related threads.

  • User-level threads do not require hardware support.

  • Kernel-level threads can run on different processors.

Question 9

A thread is called a lightweight process because it shares resources with other threads. Which of the following is TRUE?

( GATE 2011 | MCQ )

  • OS maintains only CPU registers per thread.

  • OS does not maintain a separate stack per thread.

  • OS does not maintain virtual memory state per thread.

  • OS maintains only scheduling information per thread.

Question 10

Main difference between a process and a thread is:

  • Processes share memory, threads do not

  • Threads share memory, processes do not

  • Threads are heavier than processes

  • Processes are faster to create than threads

There are 12 questions to complete.

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