Digital Electronics MCQ Online Test

Practice Online Digital Electronics Test and check your score before you appear for your next written test.

1. The output of a logic gate is 1 when all its inputs are at logic 0. The gate is either

A) a NOR or an X-NOR
B) a NAND or an X-OR
C) an OR or an X-NOR
D) an AND or an X-OR

2. For checking the parity of a digital word, it is preferable to use

A) AND gates
B) NOR gates
C) NAND gates
D) X-OR gates

3. A gate is enabled when its enable input is at logic 1. The gate is

A) NAND
B) NOR
C) none of the answers
D) OR

4. The output of a logic gate is 1 when all its inputs are at logic 0. The gate is either

A) an OR or a NAND
B) an X-OR or an X-NOR
C) an AND or an X-NOR
D) a NAND or a NOR

5. The output of a gate is HIGH if and only if all its inputs are LOW. It is true for

A) NOR
B) X-NOR
C) X-OR
D) NAND

6. A bubbled NOR gate is equivalent to a

A) AND gate
B) X-OR gate
C) NOR gate
D) NAND gate

7. The output of a gate is LOW when at least one of its inputs is HIGH. This is true for

A) NOR
B) AND
C) OR
D) NAND

8. The output of a gate is HIGH when at least one of its inputs is LOW. It is true for

A) NAND
B) NOR
C) OR
D) X-OR

9. Which of the following gates cannot be used as an inverter?

A) AND
B) NAND
C) X-NOR
D) NOR

10. A gate is disabled when its disable input is at logic 0. The gate is

A) AND
B) none of the answers
C) OR
D) NOR

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