# Computer Organization Questions and Answers – Numbers and Arithmetic Operations

This set of Computer Organization Questions and Answers for Aptitude test focuses on “Numbers and Arithmetic Operations”.

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

Explanation: 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 complement
c) 2’S complement
d) None of the mentioned

Explanation: The two’s complement 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 complement
c) 2’s complement
d) None of the mentioned

Explanation: One is positive and one for negative.

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

Explanation: First the 2’s complement 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 complement form is ________
a) 11110
b) 1110
c) 1010
d) 0010

Explanation: First the 2’s complement 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 complement form is _________
a) 0001
b) 1101
c) 0101
d) 1001

Explanation: First the 2’s complement 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 flags called ________
a) Conditional code flags
b) Test output flags
c) Type flags
d) None of the mentioned

Explanation: These flags are used to indicate if there is an 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

Explanation: 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 has resulted in an overflow
d) None of the mentioned

Explanation: This is used to check the overflow occurs 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 _______
d) SumSetCC

Explanation: By using this instruction the condition flags won’t 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

Explanation: None.

12. For the addition of large integers, most of the systems make use of ______
d) None of the mentioned

Explanation: 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 occurred we make use of ________
a) And gate
b) Nand gate
c) Nor gate
d) Xor gate

Explanation: 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

Explanation: 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

Explanation: None.

Sanfoundry Global Education & Learning Series – Computer Organization and Architecture.

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