Computer Organization MCQ set number 00078

1. Which method/s of representation of numbers occupies large amount of memory than others ?
a) Sign-magnitude
b) 1’s compliment
c) 2’s compliment
d) 1’s & 2’s compliment

Answer

Answer: a [Reason:] It takes more memory as one bit used up to store the sign.

2. Which representation is most efficient to perform arithmetic operations on the numbers ?
a) Sign-magnitude
b) 1’s compliment
c) 2’S compliment
d) None of the mentioned

Answer

Answer: c [Reason:] The two’s compliment form is more suitable to perform arithmetic operations as there is no need to involve the sign of the number into consideration.

3. Which method of representation has two representations for ‘0’ ?
a) Sign-magnitude
b) 1’s compliment
c) 2’s compliment
d) None of the mentioned

Answer

Answer: a [Reason:] One is positive and one for negative.

4. When we perform subtraction on -7 and 1 the answer in 2’s compliment form is ___
a) 1010
b) 1110
c) 0110
d) 1000

Answer

Answer: d [Reason:] First the 2’s compliment is found and that is added to the number and the overflow is ignored.

5. When we perform subtraction on -7 and -5 the answer in 2’s compliment form is ________
a) 11110
b) 1110
c) 1010
d) 0010

Answer

Answer: b [Reason:] First the 2’s compliment is found and that is added to the number and the overflow is ignored.

6. When we subtract -3 from 2 , the answer in 2’s compliment form is ___
a) 0001
b) 1101
c) 0101
d) 1001

Answer

Answer: c [Reason:] First the 2’s compliment is found and that is added to the number and the overflow is ignored.

7. The processor keeps track of the results of its operations using a flags called ________
a) Conditional code flags
b) Test output flags
c) Type flags
d) None of the mentioned

Answer

Answer: a [Reason:] These flags are used to indicate if there is a overflow or carry or zero result occurrence.

8. The register used to store the flags is called as ___
a) Flag register
b) Status register
c) Test register
d) Log register

Answer

Answer: b [Reason:] The status register stores the condition codes of the system.

9. The Flag ‘V’ is set to 1 indicates that,
a) The operation is valid
b) The operation is validated
c) The operation as resulted in an overflow
d) None of the mentioned

Answer

Answer: c [Reason:] This is used to check the overflow occurrence in the operation.

10. In some pipelined systems, a different instruction is used to add to numbers which can affect the flags upon execution. That instruction is _______
a) AddSetCC
b) AddCC
c) Add++
d) SumSetCC

Answer

Answer: a [Reason:] By using this instruction the condition flags wont be affected at all.

11. The most efficient method followed by computers to multiply two unsigned numbers is _______
a) Booth algorithm
b) Bit pair recording of multipliers
c) Restoring algorithm
d) Non restoring algorithm

Answer

Answer: b [Reason:] None.

12. For the addition of large integers most of the systems make use of ______
a) Fast adders
b) Full adders
c) Carry look-ahead adders
d) None of the mentioned

Answer

Answer: c [Reason:] In this method the carries for each step are generated first.

13. In a normal n-bit adder, to find out if an overflow as occured we make use of ________
a) And gate
b) Nand gate
c) Nor gate
d) Xor gate

Answer

Answer: d [Reason:] None.

14. In the implementation of a Multiplier circuit in the system we make use of _______
a) Counter
b) Flip flop
c) Shift register
d) Push down stack

Answer

Answer: c [Reason:] The shift registers are used to store the multiplied answer.

15. When 1101 is used to divide 100010010 the remainder is ______
a) 101
b) 11
c) 0
d) 1

Answer

Answer: d [Reason:] None.