MCQs on Digital Electronics

MCQs on Digital Electronics

Q: Boolean Algebra is essentially based on

1. Truth
2. Logic
3. Symbol
4. Numbers

Answer: (b) Logic

Q: The logic behind NOR gate is that it gives

1. HIgh output when both the inputs are low
2. Low output when both the inputs are low
3. HIgh output when both the inputs are high
4. None of the above

Answer: (a) HIgh output when both the inputs are low

Q: A logic gate is an electronic circuit which

1. Makes logic decisions
2. Allows electrons flow only in one direction
3. Woks binary algebra
4. Alternates between 0 and 1 values

Answer: (a) Makes logic decisions

Q: How many NAND gates are used to form an AND gate?

1. 1
2. 2
3. 3
4. 4

Answer: (b) 2

Q: The output of OR gate is 1

1. If both inputs are zero
2. If either or both inputs are 1
3. Only if both inputs are 1
4. If either input is zero

Answer: (b) If either or both inputs are 1

Which of the following logic gate is a universal gate?

1. OR
2. NOT
3. AND
4. NOR

Answer: (d) NOR

A gate in which all the inputs must be low to get a high output is

1. NAND gate
2. Inverter
3. NOR gate
4. AND gate

Answer: (b) and (c) Inverter and NOR gate

Q: The outputs of a NAND gate is 0

1. If both inputs are 0
2. If one input is 0 and the other input is 1
3. If both inputs are 1
4. If both inputs are 1 or one of the inputs is 1 and the other one is 0

Answer: (c) If both inputs are 1