LOGIC GATES MCQ
Short notes
Objective questions (Answers are given below)
- A logic gate is an electronic circuit which
(a) makes logic decision
(b) allows electron flow only in one direction
(c) works on binary algebra
(d) alternates between 0 and 1 values. - In positive logic, logic state 1 corresponds to
(a) positive voltage
(b) higher voltage level
(c) zero voltage level
(d) lower voltage level. - In negative logic, the logic state 1 corresponds
to
(a) negative voltage
(b) zero voltage
(c) more negative voltage
(d) lower voltage level. - The voltage levels of a negaive logic system
(a) must necessarily be negative
(b) may be negative orpositive
(c) must necessarily be positive
(d) must necessarily be 0V and −5V - The output of a 2-input OR gate is zero only
when its
(a) both inputs are 0
(b) either input is 1
(c) both inputs are 1
(d) either input is 0. - An XOR gate produces an output only when
its two inputs are
(a) high (b) low
(c) different (d) same. - An AND gate
(a) implements logic addition
(b) is equivalent to a series switching circuit
(c) is an any-or-all gate
(d) is equivalent to a parallel switching circuit. - When an input electrical signal A = 10100 is
applied to a NOT gate, its output signal is
(a) 01011 (b) 10101
(c) 10100 (d) 00101. - The only function of a NOT gate is to
(a) stop a signal
(b) recomplement a signal
(c) invert an input signal
(d) act as a universal gate. - A NOR gate is ON only when all its inputs are
(a) ON (b) positive
(c) high (d) OFF. - For getting an output from an XNOR gate, its
both inputs must be
(a) high (b) low
(c) at the same logic level
(d) at the opposite logic levels. - In a certain 2-input logic gate, when A = 0, B =
0, then C = 1 and when A = 0, B = 1, then again
C = 1. It must be ……. gate.
(a) XOR (b) AND
(c) NAND (d) NOR - The logic symbol shown in Fig. 70.105 represents
(a) s i n g l e – o u t p u t
AND gate
(b) NAND gate
(c) NAND gate used
as NOT gate
(d) NOR gate.
- (a) 2. (b) 3. (d) 4. (b) 5. (a) 6. (c) 7. (b) 8. (a) 9. (c) 10. (d) 11.(c) 12. (c) 13. (d)
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