STANDARD SINGLE LOGIC GATE OBJECTIVE QUESTIONS

1) The output of an AND gate with three inputs, A, B, and C, is HIGH when _

a) A = 1, B = 1, C = 0.

 

b) A = 0, B = 0, C = 0.

 

c) A = 1, B = 1, C = 1.

 

d) A = 1, B = 0, C = 1.

 

 

2) Which of the following logical operations is represented by the + sign in Boolean algebra?

a) inversion.

 

b) AND.

 

c) OR.

 

d) complementation.

 

 

3) The output of an OR gate with three inputs, A, B, and C, is LOW when

a) A = 0, B = 0, C = 0.

 

b) A = 0, B = 0, C = 1.

 

c) A = 0, B = 1, C = 1.

 

d) All of the above.

 

 

4) Output will be a LOW for any case when one or more inputs are zero for a(n) _

a) OR gate.

 

b) NOT gate.

 

c) AND gate.

 

d) NOR gate.

 

 

5) The format used to present the logic output for various combinations of logic inputs to a gate is called a(n) _

a) Boolean constant.

 

b) Boolean variable.

 

c) Truth Table.

 

d) Input logic function.

 

 

6) If a 3 – input AND gate has eight input possibilities, how many of those possibilities result in a HIGH output?

a) 1.

 

b) 2.

 

c) 7.

 

d) 8.

 

 

7) How many inputs of a four- input AND gate must be HIGH in order for the output of the logic gate to go HIGH?

a) any one of the inputs.

 

b) any two of the inputs.

 

c) any three of the inputs.

 

d) all four inputs.

 

 

8) If the output of a three – input AND gate must be a logic LOW, what must the condition of the inputs be?

a) All inputs must be LOW.

 

b) All inputs must be HIGH.

 

c) At last one input must be LOW.

 

d) At least one input must be HIGH.

 

 

9) The AND function can be used to _ and the OR function can be used to _

a) enable  disable.

 

b) disable , enable.

 

c) enable or disable, enable or disable.

 

d) detect, invert.

 

 

10) If a signal passing through a gate is inhibited by sending a LOW into one of the inputs, and the output is HIGH, the gate is a(n)  _

a) AND.

 

b) NAND.

 

c) NOR.

 

d) OR.