WAEC Physics Past Questions & Answers - Page 303

1,511.

An object weighs 10.0 N in air and 7.0 N in water. What is its weight when immersed in a liquid of relative density 1.5?

A.

4.50N

B.

4.67N

C.

5.50N

D.

6.67N

E.

8.50N

View answer & explanation

Correct answer is C

No explanation has been provided for this answer.

1,512.

A simple pendulum makes 50 oscillations in one minute. What is its period of oscillation?

A.

0.02s

B.

0.20s

C.

0.83s

D.

1.20s

E.

50.00s

View answer & explanation

Correct answer is D

No explanation has been provided for this answer.

1,513.

A force F is applied to a body P as shown in the diagram above. If the body P moves through a distance r, which of the following represents the work done?

A.

Fx

B.

F^cosθ/_x

C.

Fx tanθ

D.

Fx sinθ

E.

Fx cosθ

View answer & explanation

Correct answer is E

No explanation has been provided for this answer.

1,514.

Two forces each of 4 N act on the opposite sides of a rectangular plate as shown in the diagram above. Calculate the magnitude of g the couple acting on the plate.

A.

6.4 Nm

B.

3.2 Nm

C.

1.6 Nm

D.

0.8 Nm

E.

0.0 Nm

View answer & explanation

Correct answer is C

couple moment = F x d = 4 x 0.4 = 1.6Nm

1,515.

A girl whose mass is 55kg stands on a spring - weighing machine inside a lift. When the lift starts to ascend, its acceleration is 2ms1. What will be the reading on the machine? (Take g = ms^-2)

A.

66 kg

B.

55 kg

C.

44 kg

D.

22 kg

E.

11 kg

View answer & explanation

Correct answer is A

Reading = mg + ma = m(g + a) = 55(10 + 2)
= 660N = 66kg

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