# Half & Full Subtractor MCQ’s

This set of Digital Circuits Multiple Choice Questions & Answers (MCQs) focuses on “Half & Full Subtractor”.

1. For subtracting 1 from 0, we use to take a _______ from neighbouring bits.

a) Carry

b) Borrow

c) Input

d) Output

2. How many outputs are required for the implementation of a subtractor?

a) 1

b) 2

c) 3

d) 4

3. Half subtractor is used to perform subtraction of ___________

a) 2 bits

b) 3 bits

c) 4 bits

d) 5 bits

4. Let the input of a subtractor is A and B then what the output will be if A = B?

a) 0

b) 1

c) A

d) B

5. Let A and B is the input of a subtractor then the borrow will be ___________

a) A AND B’

b) A’ AND B

c) A OR B

d) A AND B

6. Full subtractor is used to perform subtraction of ___________

a) 2 bits

b) 3 bits

c) 4 bits

d) 8 bits

7. Let A and B is the input of a subtractor then the output will be ___________

a) A XOR B

b) A AND B

c) A OR B

d) A EXNOR B

8. What does minuend and subtrahend denotes in a subtractor?

a) Their corresponding bits of input

b) Its outputs

c) Its inputs

d) Borrow bits

9. The full subtractor can be implemented using ___________

a) Two XOR and an OR gates

b) Two half subtractors and an OR gate

c) Two multiplexers and an AND gate

d) Two comparators and an AND gate

10. The output of a full subtractor is same as ____________

a) Half adder

b) Full adder

c) Half subtractor

d) Decoder

11. The output of a subtractor is given by (if A, B and X are the inputs).

a) A AND B XOR X

b) A XOR B XOR X

c) A OR B NOR X

d) A NOR B XOR X

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