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WAEC Physics Past Questions & Answers - Page 158

786.

The ability of a material to store an electric charge when its plates are at different potentials is referred to as its

conductance

inductance

capacitance

resistance

View answer & explanation

Correct answer is C

No explanation has been provided for this answer.

787.

In which of the following media is the transmission of sound wave fastest?

Vacuum

Air

Wood

Iron

View answer & explanation

Correct answer is D

No explanation has been provided for this answer.

788.

A ray of light is incident normally on a plane mirror. If the incident ray is kept fixed while the mirror is rotated through an angle of 30°, determine the initial and final angles of reflection respectively

0^o and 60^o

90^o and 30^o

0^o and 30^o

90^o and 60^o

View answer & explanation

Correct answer is D

No explanation has been provided for this answer.

789.

Which of the following optical instruments does not depend on the use of plane mirrors?

kaleidoscope

simple microscope

sextant

simple periscope

View answer & explanation

Correct answer is B

No explanation has been provided for this answer.

790.

Radio waves travel in air at 3.0 x 10⁸ms^-1. If the waves enter water of refractive index $\frac{4}{3}$ , calculate the speed of radio waves in water

4.33 x 10⁸ms^-1

4.00 x 10⁸ms^-1

2.25 x 10⁸ms^-1

1.33 x 10⁸ms^-1

View answer & explanation

Correct answer is C

$_an_w = \frac{4}{3} = \frac{\text{speed of light in air}}{\text{speed of light in water}}$

$\frac{4}{3} = \frac{3 \times 10^8}{x}$

x = $\frac{9 \times 10^4}{4}$

= 2.25 x 10⁸m/s

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