JAMB and WAEC Computer Studies questions: Logic gates and Boolean algebra

39 questions with answers and explanations. Tap an option to check yourself.

All topics Algorithms and flowcharts · 39 Application packages · 46 Computer hardware and the CPU · 41 Computer networks and the internet · 45 Computer security, ethics and safety · 40 Data processing and information · 40 Evolution of computing · 42 Input and output devices · 40 Logic gates and Boolean algebra · 39 Memory and storage devices · 44 Number systems and data representation · 47 Programming languages and BASIC · 43 Software and operating systems · 42

Question 21· Logic gates and Boolean algebra· JAMB
In Boolean algebra, A + A equals
Explanation and discussion
Question 22· Logic gates and Boolean algebra· JAMB
De Morgan's law states that NOT(A AND B) equals
Explanation and discussion
Question 23· Logic gates and Boolean algebra· WAEC
An XOR gate gives output 1 when
Explanation and discussion
Question 24· Logic gates and Boolean algebra· JAMB
The output of an OR gate with inputs 0 and 1 is
Explanation and discussion
Question 25· Logic gates and Boolean algebra· WAEC
An AND gate gives an output of 1 only when
Explanation and discussion
Question 26· Logic gates and Boolean algebra· JAMB
The Boolean expression for an AND gate with inputs A and B is
Explanation and discussion
Question 27· Logic gates and Boolean algebra· JAMB
By De Morgan's law, NOT (A AND B) equals
Explanation and discussion
Question 28· Logic gates and Boolean algebra· JAMB
The output of an AND gate is 1 only when
Explanation and discussion
Question 29· Logic gates and Boolean algebra· WAEC
A circuit outputs 1 only when input A is 1 and input B is NOT 1. Which gate combination does this?
Explanation and discussion
Question 30· Logic gates and Boolean algebra· JAMB
A half adder produces
Explanation and discussion
Question 31· Logic gates and Boolean algebra· WAEC
A truth table shows
Explanation and discussion
Question 32· Logic gates and Boolean algebra· JAMB
A NAND gate with both inputs at 1 gives an output of
Explanation and discussion
Question 33· Logic gates and Boolean algebra· JAMB
A NOT gate
Explanation and discussion
Question 34· Logic gates and Boolean algebra· WAEC
If the input to a NOT gate is 1, the output is
Explanation and discussion
Question 35· Logic gates and Boolean algebra· WAEC
A NOT gate with input 1 gives an output of
Explanation and discussion
Question 36· Logic gates and Boolean algebra· WAEC
For inputs A = 1 and B = 0, the output of a NOR gate is
Explanation and discussion
Question 37· Logic gates and Boolean algebra· WAEC
A NAND gate is equivalent to
Explanation and discussion
Question 38· Logic gates and Boolean algebra· JAMB
An XNOR gate gives 1 when
Explanation and discussion
Question 39· Logic gates and Boolean algebra· WAEC
For an OR gate with inputs A = 0 and B = 1, the output is
Explanation and discussion

Practise Computer Studies like the real exam. A timed CBT, your score, and the topics to fix.

Start a Computer Studies test

JAMB and WAEC Computer Studies questions: Logic gates and Boolean algebra

In Boolean algebra, A + A equals

De Morgan's law states that NOT(A AND B) equals

An XOR gate gives output 1 when

The output of an OR gate with inputs 0 and 1 is

An AND gate gives an output of 1 only when

The Boolean expression for an AND gate with inputs A and B is

By De Morgan's law, NOT (A AND B) equals

The output of an AND gate is 1 only when

A circuit outputs 1 only when input A is 1 and input B is NOT 1. Which gate combination does this?

A half adder produces

A truth table shows

A NAND gate with both inputs at 1 gives an output of

A NOT gate

If the input to a NOT gate is 1, the output is

A NOT gate with input 1 gives an output of

For inputs A = 1 and B = 0, the output of a NOR gate is

A NAND gate is equivalent to

An XNOR gate gives 1 when

For an OR gate with inputs A = 0 and B = 1, the output is