WAEC Computer Science Past Questions & Answers - Page 11

51.
52.

When does the output of a NAND gate =1?

A.

whenever a 0 is present at an input

B.

only when all input =0

C.

whenever 1 is present at an input

D.

only when all input =1

Correct answer is A

Whenever a 0 is present at an input, NAND gate =0

53.

A word processor can be used to

A.

write text

B.

edit text

C.

print text

D.

all of these

Correct answer is D

No explanation has been provided for this answer.

54.

In order to avoid damages caused by security breaches, the user must?

A.

configure firewall

B.

encourage piracy

C.

install cracked software

D.

promote cyber crime

Correct answer is A

No explanation has been provided for this answer.

55.

Viruses, worms and trojan horses are all? 

A.

application software

B.

malicious software

C.

robust software

D.

system software

Correct answer is B

No explanation has been provided for this answer.