Computer Organization and Architecture - MCQS

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Question 1:

A group of bits that tell the computer to perform a specific operation is known as

a. Instruction code

b. Micro-operation

c. Accumulator

d. Register

Select one:

a. d

b. b

c. a

d. c

Correct Answer: Instruction code

Question 2:

Two processors A and B have clock frequencies of 700 Mhz and 900 Mhz respectively. Suppose A can execute an instruction with an average of 3 cycles and B can execute with an average of 5 cycles. How much faster is the  processor compared to the other?(chose the closest answer)

a) 5 times

b) 3 times

c) Both take the same time

d) 1.3 times

Select one:

a. b

b. c

c. a

d. d

Correct Answer: 1.3 times

Question 3:

(2FA0C) 16 is equivalent to

a. 2576

b. (001011111011100) 2

c. Both (A) and (B)

d. (195084) 10

Select one:

a. a

b. d

c. b

d. c

Correct Answer: (195084) 10

Question 4:

Reverse Polish notation, expression A*B+C*D is written as

a.  AB*CD*+

b. A*BCD*+

c. AB*CD+*

d. A*B*CD+

Select one:

a. c

b. d

c. b

d. a

Correct Answer: AB*CD*+

Question 5:

Two processors A and B have clock frequencies of 700 Mhz and 900 Mhz respectively. Suppose A can execute an instruction with an average of 3 cycles and B can execute with an average of 5 cycles. For the execution of the same instruction which processor is faster?

a) A

b) B

c) Both take the same time

d) Insufficient information

Select one:

a. a

b. c

c. d

d. b

Correct Answer: A

Question 6:

Find the effective address of the following instruction : MUL 7(R2,R3)

a) 7+R2+R3

b) 7+(R2*R3)

c) 7+[R2]+[R3]

d) 7*([R2]+[R3])

Select one:

a. b

b. d

c. c

d. a

Correct Answer: 7+[R2]+[R3]

Question 7:

Suppose that a bus has 16 data lines and requires 4 cycles of 250 nsecs each to

transfer data. The bandwidth of this bus would be 2 Megabytes/sec. If the cycle time

of the bus was reduced to 125 nsecs and the number of cycles required for transfer

stayed the same what would the bandwidth of the bus?

a 1 Megabyte/sec

b 4 Megabytes/sec

c. 8 Megabytes/sec

d. 2 Megabytes/sec

Select one:

a. d

b. a

c. c

d. b

Correct Answer: 2 Megabytes/sec

Question 8:

Floating point representation of   (-0.75)10 is

a.10111111010000000000000000000000

b. 00111111010000000000000000000000

c. 11111111010000000000000000000000

d. 10111111010000000000000000001111

Select one:

a. b

b. a

c. d

d. c

Correct Answer: 10111111010000000000000000000000

Question 9:

Generally Dynamic RAM is used as main memory in a computer system as it

a. Consumes less power

b. has higher speed

c. has lower cell density

d. needs refreshing circuitry

Select one:

a. 1

b. d

c. b

d. c

Correct Answer: has higher speed

Question 10:

For a microprocessor having 32 data lines and 64 address lines ,maximum number of bits that can be stored in the memory is

a)64 x 2^32

b)32 x 2^32

c)32 x 2^64

d)64 x 324

Select one:

a. c

b. a

c. d

d. b

Correct Answer: 32 x 2^64