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Q1. The output of the following gate is 1 only if at least one of its inputs is 0.
(A) AND gate
(B) OR gate
(C) NAND gate
(D) NOR gate
Answer:(C) NAND gate
Q2. ASCII and EBCDIC differ in
(A) Their efficiency in storing data
(B) The random and sequential access method
(C) The number of bytes used to store characters
(D) Their collecting sequences
Answer:(D) Their collecting sequences
Q3. Arithmetic operation are coded in
(A) Decision symbols
(B) Input/Output (I/O)
(C) Processing symbols
(D) Terminal symbols
Answer: (C) Processing symbols
Q4. With a NAND latch a low R and a low S produce a _ condition.
(D) No change
Answer: (A) Race
Q5. Conversion of binary number 1011012 to its decimal number is
Answer: (A) 4510
Q6. In which code the successive code characters differ in only one bit position?
(A) Gray code
(B) Excess 3 code
(C) 8421 code
(D) Algebraic code
Answer: (A) Gray code
Q7. Addition of 1101011012, 1110111012, 0001111112, 1001011012, 1111101112 is
Answer: (A) 10110101110102
Q8. De Morgan’s second theorem says that NAND gate is equivalent to a bubbled _ gate.
Answer: (D) OR
Q9. __ is the fastest logic family; it’s used in high-speed applications.
Answer: (C) ECL
Q10. A p-channel enhancement type MOSFET performs much the same function as a PNP transistor, except that
(A) It operates much faster
(B) It is considerably larger
(C) It is controlled by voltage rather than by current, so that it requires very little current at the control terminal
(D) It is controlled by current rather than by voltage like a bipolar transistor
Answer: (C) It is controlled by voltage rather than by current, so that it requires very little current at the control terminal
Q11. The radix of the binary number is:
Answer: (C) 2
Q12. What is the 2’s complement of 0011 0101 1001 1100 number?
(A) 1100 1010 1100 1011
(B) 1100 1010 0110 0011
(C) 1100 1010 0110 0100
(D) 1100 1010 1111 1111
Answer: (C) 1100 1010 0110 0100
Q13. An AND gate has 7 inputs, what is the only input word that produces a 1 output?
Answer: (D) 1111111
Q14. The inverter OR gate and AND gate are called decision-making elements because they can recognize some input while disregarding others. A gate recognizes a word when its output is
(A) Words, high
(B) Bytes, low
(C) Bytes, high
(D) Character, low
Answer: (A) Words, high
Q15. When the LOAD input of a buffer register is active, the input word is stored on the next positive _ edge.
Answer: (A) Clock
Digital Computer Electronics MCQ – All Set
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