WAEC Past Questions and Answers - Page 2893

14,462.

A man weighing 200 N runs up a staircase in 5s. If the height of the staircase is 9 m, calculate the power of the man.

A.

1000 W

B.

360 W

C.

40 W

D.

1800 W

Correct answer is B

power = \(\frac{force * distance}{time}\) →  \(\frac{200 *  9}{5}\)

power = 36w

14,463.

Which of the following statements best describes the particles in a solid at room temperature? They are

A.

far apart and moving randomly

B.

close together and vibrating.

C.

close together and stationary

D.

close together and moving randomly

Correct answer is B

No explanation has been provided for this answer.

14,465.

In the diagram above, a bulb is lit by drawing 2.0A from 440V a.c. source. Calculate the cost of keeping the bulb on for two days at $0.40 per kilowatt-hour .                 

 

A.

$16.90

B.

$84.48

C.

$1690.00

D.

$8.48

Correct answer is A

Power[p] = IV → 2 * 440 = 880Watt

Energy = p * t = 880 * 48hrs

= 42240 or 42.24kwh

But 1 kwh cost $0.40
∴ 42.24kwh costs 42.24 x 0.40

= 16.896 or $16.90