1. . A logic circuit which can add 2 bits is called:
(A) Half Adder
(B) Full Adder
(C) Half Subtractor
(D) Full Subtractor
2. . A half adder consists of:
(A) 2 inputs & 1 output
(B) 2 inputs & 2 outputs
(C) 3 inputs & 2 outputs
(D) 3 inputs & 3 outputs
3. . This adder cannot handle the input carry:
(A) Half Adder
(B) Full Adder
(C) Half Subtractor
(D) Full Subtractor
4. . The gate who performs the function of Sum in Half adder:
(A) AND gate
(B) OR Gate
(C) X-OR Gate
(D) NAND Gate
5. . The gate which performs the function of CO in Half adder:
(A) AND gate
(B) OR Gate
(C) X-OR Gate
(D) NAND Gate
6. . Boolean expression for CO in Half Adder is:
(A) A + B
(B) A - B
(C) A . B
(D) A + B
7. . A logic circuit which can add 3 bits at a time is called:
(A) Half Adder
(B) Full Adder
(C) Half Subtractor
(D) Full Subtractor
8. . A Full adder consists of:
(A) 2 inputs & 1 output
(B) 2 inputs & 2 outputs
(C) 3 inputs & 2 outputs
(D) 3 inputs & 3 outputs
9. . This adder can handle the input carry:
(A) Half Adder
(B) Full Adder
(C) Half Subtractor
(D) Full Subtractor
10. . If all the inputs of Full Adder are HIGH (1), then its outputs are:
(A) Sum = 0, Co = 1
(B) Sum = 1, Co = 1
(C) Sum = 0, Co = 0
(D) Sum = 1, Co = 0
11. . A logic circuit used to subtract the 2 bits is called:
(A) Half Adder
(B) Full Adder
(C) Half Subtractor
(D) Full Subtractor
12. . A half subtractor consists of:
(A) 2 inputs & 1 output
(B) 2 inputs & 2 outputs
(C) 3 inputs & 2 outputs
(D) 3 inputs & 3 outputs
13. . The gate who performs the function of Di in Half subtractor:
(A) AND gate
(B) OR Gate
(C) X-OR Gate
(D) NAND Gate
14. . A logic circuit used to subtract the 3 bits is called:
(A) Half Adder
(B) Full Adder
(C) Half Subtractor
(D) Full Subtractor
15. . A Full subtractor consists of:
(A) 2 inputs & 1 output
(B) 2 inputs & 2 outputs
(C) 3 inputs & 2 outputs
(D) 3 inputs & 3 outputs
16. . If all the inputs of Full Subtractor are HIGH (1), then its outputs are:
(A) Di = 0, Bo = 1
(B) Di = 1, Bo = 1
(C) Di = 0, Bo = 0
(D) Di = 1, Bo = 0
17. . A logic circuit which can perform both function of adder and subtractor is called:
(A) Full Adder
(B) Full Subtractor
(C) Adder-Subtractor
(D) Comparator
18. . The answer obtained to subtract 10 from 11 is:
(A) 00
(B) 01
(C) 10
(D) 11
19. . A logic circuit which compares the magnitude of two binary numbers is called:
(A) Adder
(B) Subtractor
(C) Comparator
(D) Multiplexer
20. . Which gate can be used as basic comparator?
(A) AND Gate
(B) OR Gate
(C) X-NOR Gate
(D) NAND Gate
21. . The number of full adders in a 4-Bit parallel adder will be:
(A) Two
(B) Three
(C) Four
(D) Eight
22. . For adding two 8-Bit binary number a parallel binary adder must contain full adders.
(A) Two
(B) Three
(C) Four
(D) Eight
23. . An adder-subtractor can used as:
(A) Only Adder
(B) Only Subtractor
(C) Both adder & Subtractor
(D) None of these