NEET Physics Digital Electronics and Logic Gates MCQs

Question: In Boolean algebra, Y = A + B implies that

a) output Y exists when both inputs A and B exist

b) output Y exists when either input A exists or input B exists or both inputs A and B exist

c) output Y exists when either input A exists or input B exists but not when both inputs A and B exist

d) output Y exists when both inputs A and B exists but not when either input A or B exist

Answer: output Y exists when both inputs A and B exist

Question: NAND and NOR gates are called universal gates primarily because they

a) can be combined to produce OR, AND and NOT gates

b) are widely used in Integrated circuit packages

c) are easiest to manufacture

d) are available universally

Answer: can be combined to produce OR, AND and NOT gates

Question: The gate for which output is high if atleast one input is low?

a) OR

b) AND

c) NOR

d) NAND

Answer: OR

Question:  What is the value of A.C + A.B.C where A, B and C are inputs ?

a) A.B

b) A

c) B

d) A.C

Answer:  A.B

Question:

a) NAND

b) AND

c) OR

d) XOR

Answer:  NAND

Question:

a) OR gate

b) NOR gate

c) NAND gate

d) AND gate

Answer:  OR gate

Question:

a) C

b) B

c) A

d) D

Answer:  C

Question:

a) XOR gate

b) NAND gate

c) OR gate

d) AND gate

Answer: XOR gate

Question:

a) OR gate

b) AND gate

c) NOR gate

d) NAND gate

Answer: OR gate

Question:

a) XOR gate

b) NAND gate

c) NAND gate

d) OR gate

Answer: XOR gate