__Logic gates mcq questions and answers pdf__

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__MCQ on Logic Gates __

__MCQ on Logic Gates__

**1. The output of a two input OR gate is zero, only when ______**

(a) its both inputs are one

(b) its either input : is zero

(c) its both inputs are zero

(d) its either input is zero

Answer : C

**2. The output of a two input AND gate is one only when_______**

(a) its either input is one

(b) its both inputs are one

(c) its either input is zero

(d) its both inputs are zero

Answer : B

**3. An AND gate_________**

(a) is equivalent to a series switching circuit

(b) is equivalent to a parallel switching circuit

(c) is a universal gate

(d) is a combination of series and switching circuits

Answer : A

**4. If two inputs of a NAND gate are shorted, then it is equivalent to________**

(a) an OR gate

(b) a NOT gate

(c) AND gate

(d) NOR gate

Answer: B

**5. The output logic level of an OR gate is one________**

(a) if both inputs are zero

(b) only if both inputs are one

(c) if either or both inputs are one

(d) if the inputs are neither zero nor one

Answer: C

**6. Which one of the following gates is not a basic gate______**

(a) AND

(b) OR

(c) NOR

(d) NOT

Answer: C

**7. The inverter is__________**

(a) an NOR gate

(b) A NOT gate

(c) an AND gate

(d) combination of OR and AND gate

**Answer: B**

**8. A NOR gate gives ___________**

(a) high output when both inputs are high

(b) high output when both inputs are low

(c) low output when both inputs are low

(d) high output when one input is low and the other input is high

**Answer: B**

**9. For which logic gate the following statement is true ? All low inputs produce a high output_______**

(a) OR

(b) AND

(c) NAND

(d) NOT

**Answer: C**

**10. For which logic gate the following statement is true ? The output is high, if and only if all inputs are high_______**

(a) AND

(b) OR

(c) NAND

(d) NOR

**Answer: A**

**11. The truth table of a logic gate is a table________**

(a) giving only the true numbers

(b) rejecting only the wrong numbers

(c) giving the relation-between the input and output variables of a logic gate

(d) which gives all the possible input logic levels and the corresponding resultant logic levels in the output.

**Answer: D**

**12. For a two input logic gate, the truth table has 4 possible input combinations. For a 3 input logic gate the number of combinations (entries) in the input side of the truth table are_______**

(a) 4

(b) 6

(c) 8

(d) 10

**Answer: C**

**13. The logic expression y = ABC is read as_______**

(a) y is equal to A plus B plus C

(b) y is equal to A or B or C

(c) y is equal to A and B and C

(d) y is equal to A dot B dot C

**Answer: C**

**14. For which logic gate the following statement is true ? The output is low if and only if all the inputs are high ___________**

(a) NAND

(b) NOR

(c) OR

(d) AND

**Answer: A**

**15. NAND gate is combination of ________**

(a) AND gate and OR gate

(b) AND gate and NOT gate

(c) NOT gate and OR gate

(d) AND gate and AND gate

**Answer: B**

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