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WAEC Computer Science Past Questions & Answers - Page 78

386.

The logical equation for the logic circuit in Figure 3 is

A.

¯A+B ¯C

B.

Z=A.B+C

C.

Z=A+B.C

D.

Z=¯A.B + ¯C

Correct answer is D

No explanation has been provided for this answer.

387.

Use the logic gate in Fig 2 to answer question 13.

Which of the following statements is true about logic gates X and Y?

A.

They both have multiple output variables

B.

The output state of each depends on the input state

C.

The output is true only if all inputs are true

D.

They are both equivalent gates.

Correct answer is D

No explanation has been provided for this answer.

388.
389.

The logic gates represented in Figure 1 is called 

A.

AND gate

B.

NAND gate

C.

NOR gate

D.

OR gate

Correct answer is B

No explanation has been provided for this answer.

390.

What is the least number of 750 MB capacity CD-ROM discs needed to transfer 10 GB size file?

A.

75

B.

31

C.

14

D.

13

Correct answer is B

No explanation has been provided for this answer.