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OtisamLMS
Computing

Computing · Quick practice · answer shown after each question

Logic circuits and binary adders

Question 1 of 10

Question 1 of 10

For X = (A + B)·C, when A = 0, B = 1 and C = 1, X is

Question 2 of 10

Question 2 of 10

A three-input truth table has eight rows.

Question 3 of 10

Question 3 of 10

For a half adder with inputs A = 1 and B = 1, the outputs are

Question 4 of 10

Question 4 of 10

The expression for a circuit with A and B feeding an AND gate, whose output goes into a NOT gate, is

Question 5 of 10

Question 5 of 10

A NOT gate can be made from a NAND gate by

Question 6 of 10

Question 6 of 10

A logic circuit whose output depends only on its present inputs is

Question 7 of 10

Question 7 of 10

A logic circuit whose output also depends on previous inputs (memory) is

Question 8 of 10

Question 8 of 10

Show how a NOT gate, an AND gate and an OR gate can each be built using only NAND gates.

Question 9 of 10

Question 9 of 10

Combinational circuits have memory of past inputs.

Question 10 of 10

Question 10 of 10

Gates from which every other gate can be built are called ___ gates.

Questions written by OtisamLMS in the style of the WASSCE. They are not WAEC past questions.