WAEC Physics Past Questions & Answers - Page 182

906.

The period of an oscillatory motion is defined as the

A.

average of the time used in completing different numbers of oscillations

B.

time to complete a number of oscillations

C.

time to complete one oscillation

D.

time taken to move from one extreme position to another

Correct answer is C

No explanation has been provided for this answer.

907.

A moving object is said to have a uniform acceleration if its

A.

displacement decreases at a constant rate

B.

speed is directly proportional with time

C.

velocity increases by equal amount in equal time intervals

D.

velocity varies inversely with time

Correct answer is C

No explanation has been provided for this answer.

908.

A force acts on a body for 0.5s changing its momentum from 16.0kg ms-1 to 21.0kgms-1, calculate the magnitude of the force

A.

42.0N

B.

37.0N

C.

32.0N

D.

10.0N

Correct answer is D

F = \(\frac{mv - mu}{1} = \frac{21 - 16}{0.5} = 10N\)

909.

The tendency of a body to remain at rest when a force is supplied to it is called

A.

impulse

B.

momentum

C.

inertia

D.

friction

Correct answer is C

No explanation has been provided for this answer.

910.

A piece of metal of relative density 5.0 weighs 60N in air. Calculate its weight when fully immersed in water

A.

4N

B.

5N

C.

48N

D.

60N

Correct answer is C

R.D = \(\frac{m}{m - m_2} = 5 = \frac{60}{60 - m_1} = \frac{240}{5} = 48N\)