List of top Computer Organization and Architecture Questions on Memory hierarchy asked in CUET (PG)

Given below are two statements: One is labelled as Assertion (A) and the other is labelled as Reason (R):
Assertion (A): Gray code easy to use in counter.
Reasons (R): Counter is a register, which is made of flip flops.
In the light of the above Statements, choose the most appropriate answer from the options given below :

In a memory mapped I/O system, which of the following will not be there?

During the execution of an instruction in a processor
(A) Program Counter (PC) is used to hold the address of next instruction to be executed.
(B) Instruction Register (IR) hold the instruction to be executed.
(C) Memory Address Register (MAR) is used to perform address translation.
(D) Data Register (DR) is used to perform operation on the data.
(E) Clock generates necessary control signals
Choose the correct answer from the options given below: