Computer Organization & Architecture (COA) – Questions

Computer:- A computer is characterized by the Input–Process–Output (IPO) cycle, in which it accepts input, processes the data, and produces output.

Introduction:-

NET-JUNE-2026

1.    The average memory access time is 130 ns and average time of cache memory is 100 ns . With 75% hit ratio, The average time to access a word is ?

    1.    130 ns

    2.    150 ns

    3.    132.5 ns

    4.    107.5 ns

NET-JUNE-2026

2.    A problem of size n requires n² bit operations. What is the largest size instance that can be solved in 1 second, if each bit operation is carried out in 10^-9 second ?

    1.    10⁹

    2.    3.16 x 10⁴

    3.    3.96 x 10⁷

    4.    2^{10^9}

NET-JUNE-2026

3.    Arrange the following in terms of their capacity from smallest to largest :

        A.    L3 Cache            B.    L1 Cache

        C.    CPU Register        D.    L2 Cache

Choose the correct answer from the options given below:

    1.    C, D, B, A

    2.    C, A, B, D

    3.    C, B, D, A

    4.    A, C, D, B

NET-JUNE-2026

4.    What does "Amdahl's Law" describe in the context of parallel processing ?

      1.    Maximum speedup achievable, considering serial and parallel portions of a program

      2.    The efficiency of message passing in a distributed memory system

      3.    Computational efficiency of a parallel algorithm

      4.    The reliability of a fault tolerant system

NET-DEC-2025

1.    Match the LIST-I with LIST-II

LIST-I		LIST-II
A.	(100110011)2	I.	Error detection  code
B.	Complements	II.	CISC
C.	Parity Bits	III.	Negative number
D.	Variable  length  instruction	IV.	(133)16

Choose the correct answer from the options given below:

1.    A - IV,    B - I,    C - III,    D - II

2.    A - IV,    B - III,    C - I,    D - II

3.    A - IV,    B - II,    C - III,    D - I

4.    A - I,    B - IV,    C - II,    D - III

NET-DEC-2025

2.    Match the LIST-I with LIST-II

LIST-I		LIST-II
A.	RAID level 1	I.	bit-interleaved  parity  organization
B.	RAID level 2	II.	disk mirroring
C.	RAID level 3	III.	block-interleaved  parity  organization
D.	RAID level 4	IV.	ECC organization

Choose the correct answer from the options given below:

1.    A - II,    B - I,    C - IV,    D - III

2.    A - II,    B - IV,    C - I,    D - III

3.    A - III,    B - IV,    C - I,    D - II

4.    A - IV,    B - III,    C - II,    D - I

NET-DEC-2025

3.    Which are often needed to evaluate the cache performance ?

    1.    Hit Ratio

    2.    Latency

    3.    Cache Traces

    4.    Transfer Rate

NET-DEC-2025

4.    Arrange the following in the increasing order with respect to access time.

        A.    Solid State Drive

        B.    Optical Disks

        C.    DRAMs

        D.    SRAMs

        E.    Registers

    Choose the correct answer from the options given below:

        1.    D, C, A, B, E

        2.    B, D, C, A, E

        3.    A, E, B, D, C

    

        4.    E, D, C, A, B

NET-DEC-2025

5.    Correct the order of instruction cycle:

        A.    Read the effective address

    

        B.    Fetch the information

        C.    Execute the instruction

        D.    Decode the instruction

Choose the correct answer from the options given below:

        1.    A, B, C, D

        2.    B, D, A, C

        3.    B, A, D, C

        4.    A, B, D, C

NET-DEC-2025

6.    If the virtual memory size is 32 MB and a physical memory size is 4 MB with a page size of 2 KB, Calculate the number of frames available in physical memory.     

        1.    1024

        2.    2048

        3.    3072

        4.    4096