# CEC Digital Electronics & Microprocessor Lesson 6,7 MCQ Answers (Number System)

Number System MCQ:- CEC Digital Electronics And Microprocessor Lesson 6 and 7

## MCQ’S – LESSON 6Answers(Number System)

1.Multiplication is repeated ____

• Division
• Complement
• Subtraction.

2. What is the value(1110)₂ + (0011)₂ in Binary addition?

• 10001
• 11001
• 11100
• 11111

Ans:- 1) 10001

3. What is the value (1111)₂ +(1111)₂ in Binary addition?

• 11110
• 11001
• 11100
• 11111

Ans:- 1) 11110

4. 1’s complement of 01010 is 11100

• 11100
• 11001
• 10101
• 1001

Ans:- 3) 10101

5. 1 ‘s complement of 0 and 1 respectively

• 1 & 0
• 1 & 1
• 0 & 1
• 0 & 0

Ans:- 1 & 0

6. 11011/10 is

• 1100
• 1101
• 1010
• 1011

Ans:- 1101

7. What is the value of 0/1?

• 10
• 11
• 10

Ans:- 0

8. What is the product of 1110*0101.?

• 1000110
• 1000010
• 1100110
• 1010110

Ans:- 1000110

9. Subtraction of 1110 and 1010 is

• 0101
• 0100
• 0110
• 1100

Ans:- 0100

10. What is the value of 10-1?

• 10
• 01

Ans:- 1

11. Binary addition of 11+1 is

• 101
• 001
• 110
• 100

Ans:- 100

12. Product of 111*10.10 is

• 10001.10
• 11001.10
• 10101.10
• 10001.11

Ans:- 10001.10

13. 1’s complement of 1100 is

• 0011
• 1000
• 1001
• 0100

Ans:- 0011

14. 11101010-00001101 is

• 11010101
• 11011101
• 11011100
• 11001101

Ans:- 11011101

15. Product of 11101 and 00000010 is

• 111010
• 111011
• 111110
• 110010

Ans:- 111010

## MCQ’S – LESSON 7Answers(Number System)

1.What is the 1’s complement of 1 ?

• 0
• 11
• 00

Ans:- 0

2. In 1’s complement subtraction if a carry is not produced then it is

• positive number
• negative number
• zero
• one

Ans:- negative number

3. Subtract the following two  numbers using 1’s complement.11010 and 1001

• 110011
• 10001
• 100011
• 101011

Ans:- 10001

4. Subtract 6 from 5 using ones complement.

• -001
• -010
• 101
• 110

Ans:- -001

5. If  carry is not produced in the  result of 2’s complement subtraction then the number is

zero

one

negative

positive

Ans:- negative

6. what is the 2’s complement subtraction of 1100 and 1010.

• 11
• 01
• 10
• 00

Ans:- 10

7. what is the 2’s complement subtraction of 1100 and 1010.

• 11
• 01
• 10
• 00

Ans:- 011

8. Carry should be ignored in 2’s complement subtraction.

• True
• False

Ans:- True

9. Subtract using 9’s complement of 4 and 1 is

• 1

Ans:- 3

10. Subtract using  10’s complement of 23and 28 is

• 3
• -3
• -5
• 5

Ans:- -5

11. In 10’s complement subtraction , the carry generated is ignored.

• True
• False

Ans:- True

12. Digital system offers how many states?

• 4
• 2
• 5

Ans:- 2

13. BCD equivalent of decimal 8 is

• 0001
• 1000
• 1100
• 0010

Ans:- 1000

14. BCD equivalent of 707 is

• 011100000111
• 111100000111
• 011110000111
• 011100000011

Ans:- 011100000111