WAEC Past Questions and Answers - Page 4217

21,081.

A stone tied to a string is made to revolve in a horizontal circle of radius 4m with an angular speed of 2 rad per sec. With what tangential velocity will the stone move off the circle if the string is cut?

A.

16.0 ms-1

B.

8.0 ms-1

C.

6.0 ms-1

D.

2.0 ms-1

E.

0.5 ms-1

View answer & explanation

Correct answer is B

V = wr = 2x4 = 8.0 ms-1

21,082.

A piece of cork floating on water is acted upon by the forces of...

A.

Weight and viscosity

B.

weight and upthrust

C.

upthrust and viscosity

D.

weight only

E.

upthrust only

View answer & explanation

Correct answer is B

No explanation has been provided for this answer.

21,083.

A block of material of volume 20cm-3 and density 2.5gcm-3 is suspended from a spring balance with half the volume immersed in water. What is the reading of the spring balance? (Density of water = 1.0gcm-3).

A.

8g

B.

25g

C.

30g

D.

40g

E.

50g

View answer & explanation

Correct answer is D

W = pvg = (2.5 x 10 x 60)/100 = 0.500N.
Upthrust = wt of liquid displaced = pvg water.
pvg water = (1x20x10)/2 = 0.10N
Reading => 0.500N - 0.100N = 0.4N = 40g

21,084.

Which of the following is used to determine the relative density of the acid in a car battery?

A.

Hypsometer

B.

Hygrometer

C.

Manometer

D.

Hydrometer

E.

Spectrometer

View answer & explanation

Correct answer is D

No explanation has been provided for this answer.

21,085.

A boy pulls a nail from the wall with a string tied to the nail. The string is inclined at an angle of 60o to the wall. If the tension in the string is 4N, what is the effective force used in pulling the nail?

A.

2√3 N

B.

4 N

C.

4√3 N

D.

8 N

E.

2 N

View answer & explanation

Correct answer is A

F = 4 x sin 60o
F = 4 x √3/2 = 2√3 N


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