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# Computer Organization & Architecture MCQ [ Set - 9 ] | Computer Organization and Architecture mcq for Gate

Table of Content (toc)

1. Logic X-OR operation of (4ACO)H& (B53F)H results _____.

AACB
0000
FFFF

2.  Instruction cycle is

fetch-decode-execution
fetch-execution-decode
decode-fetch-execution

3. The processing elements are linked by a 2-dimension near-neighbour mesh and this gives an advantage of high bandwidth.

State True or False:

1- False, 2- False
1- True, 2- True
1- False, 2- True
ANSWER= (C) 1- False, 2- True

4. Gray code is -

weighed code
unweighted code
self complementing code
ANSWER= (B) unweighted code

5. The average time required to reach a storage location in memory and obtain itscontents is called

Latency time.
Access time.
Turnaround time.
ANSWER= (B) Access time.

6. Floating point representation is used to store -

Boolean values
whole numbers
real integers
ANSWER= (C) real integers

7. If the main memory is of 8K bytes and the cache memory is of 2K words. Ituses associative mapping. Then each word of cache memory shall be_____.

11 bits
21 bits
16 bits

ANSWER= (C) 16 bits

8. In signed-magnitude binary division, if the dividend is (11100)2, and divisor is (10011)2, then the result is

(00100)2
(11001)2
(10100)2

9. The half adder performs

Decimal addition operation for 2 decimal inputs
Binary addition operation for 2 binary inputs
Decimal addition operation for 2 binary inputs
ANSWER= (B) Binary addition operation for 2 binary inputs

10. (-27)10 can be represented in a signed magnitude format and in a l's complement format is

111011 & 100100
100100 & 111011
011011 & 100100
ANSWER= (A)  111011 & 100100

11. In which year was the first analog computer built by an American named vinegar Bush?

1920
1930
1940

12. In floating point representation, biased exponent is used to

facilitate tion of zero
increase the range of representation
reduce the overhead of comparing the sign bits of exponent in floating point arithmetic
ANSWER= (D) both (b) & (c)

13. The Cray-1usually had a performance of about ___, but with up to three chains running, it could hit the highest point at ___.

80 MFLOPS, 140 MFLOPS
80 MFLOPS, 120 MFLOPS
80 MFLOPS, 240 MFLOPS
ANSWER= (A) 80 MFLOPS, 240 MFLOPS

14. Maximum value of a n bit 2's complement number is -

2n
2-1
2n-¹-1

15. The load instruction is mostly used to designate a transfer from memory to aprocessor register known as____.

Accumulator
Instruction Register
Program counter

16. Which of the following comment about the SP is true ?

It is used to count the no of instructions
It is a General Purpose Register
During execution of the current instruction, its content changes
ANSWER= (D) Holds the address of the top element of the stack

17. Logic gates with a set of input and outputs is arrangement of

Combinational circuit
Logic circuit
Design circuits
ANSWER= (A) Combinational circuit

18. The addressing mode used in an instruction of the form ADD X,#10 is

absolute register
immediate
indirect

19. Computer system is controlled by its

DVD
CPU
RAM

20. Which of the following register is loaded with the contents of the memory location pointed by the PC

Memory data registers
Instruction register

21. ___ helps in instruction execution. It receives branch instructions and resolves the conditional branches as early as possible.

Branch processing, Intel IA-64 architecture
Branch prediction, Branch processing
Intel IA-64 architecture, RISC
ANSWER= (A) Branch prediction, Branch processing

22. Which of the following storage devices require constant electricity?

Hard drive
Disks
Tape drive

23. ALU performs

only arithmetic operation
both arithmetic and logic operation
storing of data
ANSWER= (B) both arithmetic and logic operation

24. The main difference between JK and RS flip-flop is that

ANSWER= (C) JK flip-flop accepts both inputs as 1

25. On a PC, how much memory is available to application software?

560 KB
640 KB
760 KB
ANSWER= (B) 640 KB

26. The circuit used to store one bit of data is known as ______.

Encoder
OR gate
Flip Flop
ANSWER= (C) Flip Flop

27. For arithmetic operations computers uses

2's complement form
1's complement form
no complement form
ANSWER= (A) 2's complement form

28. (2FAOC) 16 is equivalent to

(195 084) 10
(001011111010 0000 1100) 2
Both (A) and (B)
ANSWER= (B) (001011111010 0000 1100) 2

29. Simplified form of the expression XYZ + YZ+ XZ is

XY
X + Y

30. An instruction pipeline can be implemented by means of

LIFO buffer
FIFO buffer
Stack
ANSWER= (B) FIFO buffer

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