UGC NET Computer Science 2024 Previous Year Questions (PYQs) – Page 16 of 20

If $L_1$ and $L_2$ are context free languages, which of the following is True about $L_1 \cap L_2$ ?

Arrange the following stages of a Turing Machine (TM) operation in the correct order as they occur during computation.

(A) Writing a symbol on the tape

(B) Moving the tape head left or right

(C) Reading a symbol from the tape

(D) Transitioning to a new state based on the current state and symbol read

(E) Halting and accepting or rejecting the input

Choose the correct answer from the options given below :

Which of the following statements are TRUE about Privileged Instructions?

(A) It can only be executed by the Operating System kernel and not by user applications.

(B) It is designed to perform operations that can directly affect the hardware or system state such as I/O operations or changing memory management setting.

(C) User applications can execute privileged instructions if they have correct permissions, set by the Operating System.

(D) It is usually executed in user mode to ensure the safety and security of the system.

Choose the correct answer from the options given below :

A CPU has a 5-stage pipeline with the following stages:

Fetch (F), Decode (D), Execute (E), Memory (M) and Write-back (W).

Each stage takes one clock cycle to complete. Assume there are no pipeline stalls and the pipeline is initially empty.

How many clock cycles are required to complete the execution of 10 instructions?

Match List – I with List – II.

Choose the correct answer from the options given below :