# 50 Best MCQ Computer Science Number System Class 11

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## Q1. Which of the following number system is known as base-10 system.

a. Binary Number System

c. Octal Number System

d. Decimal Number System

a. matrix

d. exponent

## Q3. Which of the following is not a number system in reference to computer?

a. Binary number system

b. Decimal number system

c. Octal number system

d. Penta number system

a. 0 and 2

b. 1 and 2

c. 0 and 1

d. 1 and 3

## Q5. Binary number system is also referred as ___________________

a. base-2 system

b. base-8 system

c. base-10 system

d. base-16 system

## Q6. Which of the following is not an examples of binary numbers?

a. 010101

b. 11100.01

c. 111001

d. None of the above

a. 8

b. 7

c. 19

d. 10

a. 0 – 7

b. 1 – 7

c. 1- 8

d. 0- 9

a. 123

b. 478

c. 372

d. 136

a. 8

b. 16

c. 10

d. 2

a. 1

b. 2

c. 3

d. 4

a. 1C2

b. 2A.1

c. 1ABCD

d. 67GA

a. 0

b. 9

c. 10

d. A

a. A

b. C

c. E

d. F

a. 1110

b. 1111

c. 1100

d. 1101

## Q16. Which of the following memory address is easy to remember or compact in size?

d. None of the above

## Q17. Which of the following are application of Hexadecimal number system?

a. To simplify the memory address representation

b. Hexadecimal numbers are used for describing the colors on the webpage.

c. Both of the above

d. None of the above

## Q18. Which of the following number system is mostly used by humans for their mathematical/calculation work?

a. Binary number system

b. Decimal number system

d. Octal number system

## Q19. Which of the following number system is used by digital devices?

a. Binary number system

b. Decimal number system

d. Octal number system

## Q20. Which of the following number system is used to simplify the binary representation for us to understand?

b. Octal number system

c. Both of the above

d. None of the above

## Q21. Which of the following sequence is correct to convert decimal number to binary?

```Step 1: Note the remainder.
Step 2: Divide the given number by 2.
Step 3: Write the noted remainders in the reverse order (from bottom to top)
Step 4: Keep on dividing the quotient by 2 and note the remainder till the quotient is zero.```

a. Step 1, Step 2, Step 3, Step 4

b. Step 2, Step 1, Step 4, Step 3

c. Step 3, Step 2, Step 1, Step 4

d. Step 2, Step 3, Step 1, Step 4

a. 1000001

b. 1000000

c. 1000011

d. 100001

a. 2

b. 8

c. 10

d. 16

a. 172

b. 173

c. 174

d. 171

## Q25. Which of the following will occupy more memory space?

a. 1111 (binary number)

c. 12 (Octal number)

d. None of the above

a. 10

b. 2

c. 8

d. 16

a. 7A

b. 7B

c. 7C

d. 7D

a. 4 bits

b. 2 bits

c. 3 bits

d. 5 bits

## Q29. For converting binary to octal, “If number of bits in a binary number is not multiple of 3, then add required number of 0s on ______ of the binary number

a. least significant position

b. most significant position

c. Any of the above

d. None of the above

a. 4 bits

b. 2 bits

c. 3 bits

d. 5 bits

a. 1101

b. 1111

c. 1001

d. 1000

## Q32. To convert 110010101101 to hexadecimal value, we make a group of 4 bits from ____________

a. right to left

b. left to right

c. between

d. None of the above

## Q33. Which is the Most Significant Bit (MSB) in 010101

a. 0

b. 1

c. Both of the above

d. None of the above

## Q34. Which is the Least Significant Bit (LSB) in 010101

a. 0

b. 1

c. Both of the above

d. None of the above

a. 0.11

b. 0.00

c. 0.01

d. 1.00

## Q36. Which of the following mathematical operation is used to convert Decimal Number with fractional part only like 0.125 to another Number System

b. Subtraction

c. Multiplication

d. Division

a. 2

b. 4

c. 6

d. 8

## Q38. To convert binary number 10101100.01011 to octal number, we will make 3-bit groups from ____________ for the integer part and _______ for the fractional part

a. right to left, left to right

b. left to right, right to left

c. right to left, right to left

d. left to right, left to right

a. 2

b. 10

c. 16

d. 8

a. A

b. B

c. X

d. AB

a. 117

b. 165

c. 75

d. 175

a. 117

b. 165

c. 75

d. 175

a. 117

b. 165

c. 75

d. 175

`98E`

a. 100110001111

b. 100110001110

c. 100110101110

d. 100110001010

`A.A`

a. 10.625

b. 10.125

c. 10.725

d. 10.250

`198`

a. 310

b. 316

c. 306

d. 326

`2960`

a. B90

b. A90

c. B91

d. A91

## Q48. Hexadecimal representation of the following binary number is ______________

`1101011.10101`

a. 6B.A8

b. 6B.A81

c. 6B.98

d. 6A.A8

## Q49. Octal representation of the following binary number is ___________

`1111.0101`

a. 17.25

b. 17.24

c. 17.26

d. 17.27

`A7B`

a. 5175

b. 5174

c. 5173

d. 5172

## Computer Science Number System Class 11 MCQ

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