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WAEC Computer Science Past Questions & Answers - Page 82

406.

In hexadecimal number system, B, D, E represent_________

A.

11, 12, 13 respectively

B.

12, 14, 15 respectively

C.

13, 14, 15 respectively

D.

14, 16, 17 respectively

Correct answer is B

A = 10
B = 11
C = 12
D = 13
E = 14
F = 15
B = 11, D = 13, E = 14

407.

Given that 26 10 = X 2, X is _________

A.

11011

B.

11010

C.

11110

D.

10111

Correct answer is B

2     26
2     13     r    0
2      6      r    1
2      3      r    0
2      1      r    1
        0      r    1
11010
x = 11010

408.

Evaluate the BASIC statement:

LET Z = 4*W^2  + 2*Y
Given that W = 5 and Y = 10

A.

50

B.

80

C.

100

D.

120

Correct answer is D

4*W^2 + 2*Y
Given that W = 5 and Y = 10

4(5) \^2 + 2(10)
4(25) + 2(10)
100 + 20 = 120

409.

The process of restarting a computer is known as ________

A.

Cold booting

B.

Warm booting

C.

Resume booting

D.

Restart booting

Correct answer is B

No explanation has been provided for this answer.

410.

The Instruction fetched into the CPU is decoded by the___________

A.

Primary memory

B.

Program counter

C.

ALU

D.

Control unit

Correct answer is D

No explanation has been provided for this answer.