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Q1. Which of the following Boolean algebra statements represent commutative law
(A) (A+B)+CA+(B+C)
(B) A.(B+C)(A.B)+(A.C)
(C) A+BB+A
(D) A+AA
Answer: (C) A+BB+A
Q2. Computers use thousands of flip-flops. To coordinate the overall action, a common signal called the _ is sent to each flip-flop.
(A) Latch
(B) Clock
(C) Master
(D) Slave
Answer: (B) Clock(B) Clock
Q3. How many bytes are there in 1011 1001 0110 1110 numbers?
(A) 1
(B) 2
(C) 4
(D) 8
Answer:(B) 2
Q4. Consider as RS flip-flops with both inputs set to 0. If a momentary ‘1’ is applied at the input S, then the output
(A) Q will flip from 0 to 1
(B) Q will flip from 0 to 1 and then back to 0
(C) Q̅ will flip from 0 to 1
(D) Q̅ will flip from 0 to 1 and then back to 0
Answer:(A) Q will flip from 0 to 1
Q5. Conversion of decimal number 9910 to it’s octal number equivalent is
(A) 1218
(B) 1438
(C) 1248
(D) 1198
Answer: (B) 1438
Q6. A logic circuit which is used to change a BCD number into an equivalent decimal number is
(A) Decoder
(B) Encoder
(C) Multiplexer
(D) Code converter
Answer: (B) 1438
Q7. An odd-parity generator produces an odd-parity bit to go along with the data. The parity of the transmitted data is An XOR gate can test each received word for parity rejecting words with parity.
(A) Odd, even
(B) High, low
(C) Low, high
(D) Even, odd
Answer: (A) Odd, even
Q8. The 2-input XOR gate has a high output only when the input bits are __
(A) Even
(B) Different
(C) Low
(D) High
Answer: (B) Different
Q9. A half-adder adds _ bits
(A) 2
(B) 8
(C) 10
(D) 16
Answer: (A) 2
Q10. A half-adder adds _ bits
(A) 2
(B) 8
(C) 10
(D) 16
Answer: (A) 2
Q11. The 2’s compliment of binary number 010111.1100 is
(A) 101001.1100
(B) 101000.0100
(C) 010111.0011
(D) 101000.0011
Answer: (B) 101000.0100
Q12. Conversion of an octal number 478 to its binary number is
(A) 1100112
(B) 1001112
(C) 1100112
(D) 11110112
Answer: (B) 1001112
Q13. What is the 1’s complement of 0000 1111 0010 1101 number?
(A) 1111 0000 0010 1101
(B) 1111 0000 1101 0010
(C) 1111 1100 1010 1100
(D) 1001 0010 1010 1100
Answer: (B) 1111 0000 1101 0010
Q14. The OR gate has two or more input signals. If any input is _ the output is high.
(A) Low
(B) High
(C) Zero
(D) None of the above
Answer: (B) High
Q15. Computer ICs work reliably because they are based on _ design.
(A) Top-bottom
(B) System
(C) Two-stage
(D) Two-states
Answer: (D) Two-states
Digital Computer Electronics MCQ – All Set
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