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Logic Gates – 1 – 3

11. An AND gate will function as OR if :

(a) All the inputs to the gates are “1”
(b) All the inputs are ‘0’
(c) Either of the inputs is “1”
(d) All the inputs and outputs are complemented

Answer
Answer : (d)

Explanation
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12. NAND gates are preferred over others because these :

(a) Have lower fabrication area
(b) Can be used to make any gate
(c) Consume least electronic power
(d) Provide maximum density in a chip

Answer
Answer : (b)

Explanation
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13. In case of OR gate, no matter what the number of inputs.

(a) A 1 at any input causes the output to be at logic 1
(b) A 1 at any input causes the output to be at logic 0
(c) A 0 at any input causes the output to be at logic 0
(d) A 0 at any input causes the output to be at logic 1

Answer
Answer : (a)

Explanation
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14. The output of a ……… gate is only 1 when all of its inputs are 1.

(a) NOR
(b) XOR
(c) AND
(d) NOT

Answer
Answer : (c)

Explanation
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15. Which of these are universal gates :

(a) Only NOR
(b) Only NAND
(c) Both NOR and NAND
(d) Neither NOR nor NAND

Answer
Answer : (c)

Explanation
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