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Q1. The 2’s compliment of binary number 0.01011 is:
(A) 1.10101
(B) 0.10101
(C) 1.10100
(D) 0.10100
Answer: (A) 1.10101
Q2. Multiplication of 1112 by 1012 is
(A) 1100112
(B) 1000112
(C) 1111002
(D) 0001012
Answer: (B) 1000112
Q3. What is the hexadecimal equivalent of a binary number 10101111
(A) AF
(B) 9E
(C) 8C
(D) None of the above
Answer: (A) AF
Q4. Addition of 11012 and 10102 is
(A) 101012
(B) 110002
(C) 110112
(D) 101112
Answer: (D) 101112
Q5. Conversion of decimal number 6110 to it’s binary number equivalent is
(A) 1100112
(B) 110011102
(C) 1111012
(D) 111112
Answer:(C) 1111012
Q6. Conversion of binary number 111112 to an octal number is
(A) 358
(B) 328
(C) 378
(D) 428
Answer:(C) 378
Q7. How many full and half-adders are required to add 16-bit numbers?
(A) 8 half-adders, 8 full-adders
(B) 1 half-adders, 15 full-adders
(C) 16 half-adders, no full-adders
(D) 4 half-adders, 12 full-adders
Answer:(B) 1 half-adders, 15 full-adders
Q8. A half-adder is also known as:
(A) AND circuit
(B) NAND circuit
(C) NOR circuit
(D) EX-OR circuit
Answer: (D) EX-OR circuit
Q9. A multiplexer is also known as
(A) Coder
(B) Decoder
(C) Data selector
(D) Multi-vibrator
Answer: (C) Data selector
Q10. The highest decimal number that can be represented with 10 binary digits is
(A) 1023
(B) 1024
(C) 512
(D) All of the above
Answer: (A) 1023
Q11. In which of the following adder circuits, the carry look ripple delay is eliminated?
(A) Half adder
(B) Full adder
(C) Parallel adder
(D) Carry-look-ahead adder
Answer: (D) Carry-look-ahead adder
Q12. Semiconductor memory is:
(A) Somewhat slower than magnetic core memory
(B) A volatile memory
(C) Somewhat larger than the magnetic core memory
(D) None of the above
Answer: (B) A volatile memory
Q13. The number of two-input NAND gates required to produce the two-input OR function is
(A) 4
(B) 3
(C) 2
(D) 1
Answer: (B) 3
Q14. Division of 1000112 by 1012 is
(A) 1002
(B) 1112
(C) 1012
(D) 10102
Answer: (B) 1112
Q15. Conversion of binary number 1011012 to hexadecimal is
(A) 3716
(B) 2D16
(C) 2E16
(D) 2716
Answer: (B) 2D16
Digital Computer Electronics MCQ – All Set
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