This set of Computer Fundamentals Interview Questions and Answers for freshers focuses on “The Decimal Number System”.

1. The value of base in a decimal number system is ____________

a) 8

b) 2

c) 10

d) 16

View Answer

Explanation: A decimal number system consists of 10 digits from 0 to 9.

The definition of base describes it as a quantity to represent the number of digits present in that particular number system.

Therefore, here, the base is 10.

2. Convert : (110)_{2} = ( __ )_{10} .

a) 4

b) 5

c) 6

d) 9

View Answer

Explanation: The base 2 represents that the number is binary ,whereas, the base 10 represents that it is to be converted to the decimal format.

Conversion: 2

^{2}* 1 + 2

^{1}* 1 + 2

^{0}*0 = 6.

3. The 2’s complement of 15 is ____________

a) 0000

b) 0001

c) 0010

d) 0100

View Answer

Explanation: 2’s complement is obtained by adding 1 to the 1’s complement of the number.

Here, Binary of 15 = 1111

1’s complement of 15= 0000

2’s complement of 15= 0000+1=0001.

4. Another name for base is __________

a) root

b) radix

c) entity

d) median

View Answer

Explanation: Another name for base is radix. Base refers to the number of digits that a particular number system consists of.

The base of decimal number system is 10 , binary is 2 and so on.

5. The decimal equivalent of (0.101)_{2} will be ____________

a) 0.5

b) 0.625

c) 0.25

d) 0.875

View Answer

Explanation: Since the base is 2 , it could be easily guessed that the number is binary. Conversion: 2

^{-1}* 1 + 2

^{-2}* 0 + 2

^{-3}* 1 = 0.625.

6.The signed magnitude for -3 will be ___________

a) 00000011

b) 10000011

c) 11111101

d) 11111100

View Answer

Explanation: Signed Magnitude of a number is a representation to determine if the number is positive or negative.

If the MSB of a number is 0 , the number is positive , else if it is 1 the number is negative.

Here, +3 = 00000011

-3= 100000011.

7. A number with both integer and a fractional part has digits raised to both positive and negative powers of 2 in a decimal number system.

a) True

b) False

View Answer

Explanation: In a decimal number system, a number with both integer and a fractional part has digits raised to both positive and negative powers of 10 and not 2.

e.g. 22.34 = 2 * 10

^{1}+ 2 * 10

^{0}+ 3 * 10

^{-1}+ 4 * 10

^{-2}.

8. The hexadecimal representation of 14 is _______________

a) A

b) F

c) D

d) E

View Answer

Explanation: The hexadecimal representations are as follows:

10 : A

11 : B

12 : C

13 : D

14 : E

15 : F.

9. Which of the following is not a decimal number?

a) 114

b) 43.47

c) 99.9A

d) 10101

View Answer

Explanation: All the numbers except 99.9A are decimal numbers.

This number has a hexadecimal component A in it therefore , it is not a valid decimal number.

The decimal equivalent of A is 10.

10. Select the incorrect option :

a) (101)_{10} = (1100101)_{2}

b) G is valid in hexadecimal system.

c) C represents 12

d) The base of a decimal number system is 10.

View Answer

Explanation: G is not a valid hexadecimal number. In this system , only representations from A to E are used to represent the numbers from 10 to 15. The base of the hexadecimal number system is 16.

**Sanfoundry Global Education & Learning Series – Computer Fundamentals.**

To practice all areas of Computer Fundamentals for Interviews, __here is complete set of 1000+ Multiple Choice Questions and Answers__.