WAEC Past Questions and Answers - Page 2270

11,346.

Major behavioural manifestations of drug addicts include the following except

A.

Mental disorder

B.

Isolation and withdrawal

C.

Depression and regrets

D.

Humility and boldness

Correct answer is D

No explanation has been provided for this answer.

11,347.

A society that is free from HIVIAIDS infected persons will likely experience

A.

Increase in level of poverty

B.

Increase in productivity

C.

Loss of man power

D.

High death rate

Correct answer is B

No explanation has been provided for this answer.

11,348.

Which of the following agents is not saddled with the responsibility of maintaining traffic regulation in Nigeria?

A.

Vehicle Inspection officer

B.

Nigerian Customs Officer

C.

Police Traffic Warden

D.

Corps Marshal

Correct answer is D

No explanation has been provided for this answer.

11,349.

The population of a village decreased from 1,230 to 1,040 due to breakout of an epidemic. What is the percentage decrease in the population?

A.

15.44%

B.

15.43%

C.

15.42%

D.

15.45%

Correct answer is D

Original population = 1,230
New population = 1,040
Decrease in population = 1,230 – 1,040 = 190
Percentage decrease in population = decrease in population   x 100%
                                                              original population         

= \(\frac {190}{1,230}\) x 100 = 15.45%

11,350.

Let '*' and '^' be two binary operations such that a * b = a\(^2\)b and a ^ b = 2a + b. Find (-4 * 2) ^ (7 * -1).

A.

-49

B.

64

C.

113

D.

15

Correct answer is D

Given that, a * b = a\(^2\)b and a ^ b = 2a + b

(-4 * 2) = (-4)\(^2\) x 2 = 16 x 2 = 32

(7 * -1) = 7\(^2\) x (-1) = 49 x (-1) = -49

∴ (-4 * 2) ^ (7 * -1) = 2(32) + (-49) = 64 - 49 = 15