Computer Studies Practice Test – Logic Circuits (Questions with Answers and Explanations)

If A = 0, and B = 1 are inputs for a NOR gate operation, the logical output for  is ______ (NECO 2015)

A. 0   
B. 1
C. -1
D. 0,1.

The logic expression for a NOR gate is ______ (NECO 2018) 

A. X = A + B.
B. X = .
C. X =  + B.
D. X =   .

If the output signal of any logic gate is fed into an inverter, the results is ______ (WASSCE 2014)

A. NOT gate.
B. NOR gate.
C. the inverse of the output signal.
D. the same as the output signal.

X, Y and Z respectively in the above figure represents ________ (WASSCE 2015)

A. input, output and input signals.
B. output, output and input signals.
C. output, input and output signaIs.
D. input, input and output signals.

Given that X and Y are input variables while Z is the output. The truth table represents ______ (WASSCE 2018)

In Figure above, X, Y and Z respectively represent ________ (WASSCE 2014)

A. input, output and input signals.
B. outputs output and input signals.
C. output, input and output signals.
D. input, input and output signals

A Logic gate is an electronic circuit which _________ (NECO 2016) 

A. allows electron flow in one direction.
B. alternates between 0 and 1 value
C. makes logical decisions.
D. simplifies the design of logic circuit.

When signals X = 0 and Y = 1, signal Z is ______ (WASSCE 2015)

A. 0.1
B. 0
C. 1
D. 0 + 1

The table above represents the Truth Table for _______

Which of the following is not a logic function? (NECO 2015)

A. ADD
B. AND
C. NAND
D. NOT

If P =1 and Q = 1, find the value of NOT(P and Q). (NECO 2014)

A. 0     
B. 0 and 1   
C. 1   
D. 1 and 0

The   represents ______ gate. 

A. AND
B. NOR
C. NAND
D. NOT

Figure 1 represents ______ (WASSCE 2018)

A. a NOT gate.
B. a NAND gate.
C. a NOR gate.
D. an OR gate.

The figure above represents ________ (WASSCE 2014) 

A. an AND gate.
B. an OR gate.
C. a NOT gate.
D. a NAND gate

Which of the following set of numbers uses digital circuit? (NECO 2018)

A. 0,0
B. 0,1
C. 1,1
D. 10,11

The function of a “NOT gate” is to ________ (NECO 2018)

A. act as a universal signal.
B. implement logic addition.
C. invert an input or output signal.
D. stop a signal.

In Boolean Algebra which of the following gates is referred to as logical inversion? (NECO 2015)

A. AND
B. NAND
C. NOR
D. NOT

Identify the logic gate in figure 2. (WASSCE 2018)

A. an AND gate.
B. a NAND gate.
C. a NOR gate.
D. an OR gate

The logic gate that will have “on” or “1” as its output when one of its input is “on” is a/an _____ gate. (NECO 2016)

A. AND
B. OR
C. NOR
D. NOT

The above Figure represents ______ (WASSCE 2015)

A. a NOT gate.
B. a NAND gate.
C. an AND gate.
D. an OR gate.

The algebraic equation for the AND gate with input variables A and B is ______ (WASSCE 2018)

A. X = A.B.
B. X = A+B.
C. X = AB.
D. X =

Which of these is not a logic comparison symbol in computer studies? (NECO 2014)

A. =     
B. <     
C. >     
D. A

Which of the following logical operations is represented by the “+” sign in Boolean algebra? (NECO 2018) 

A. AND
B. OR
C. Inversion
D. NAND

A logic gate contains three input variables. The total possible combination of the input variables is _______ (WASSCE 2018)

A. 3.
B. 4.
C. 8.
D. 12.