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2018 - WAEC Physics Past Questions and Answers - page 3

21

Rainbow formation is a natural phenomenon illustrating that white light

A

splits into three components after rainfall

B

is dispersed by glass prisms

C

splits into its constituent colours before rainfall

D

is dispersed into its constituent colours after rainfall

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22

The lens illustrated above can best be described as a

A

converging meniscus

B

plano-convex

C

diverging meniscus

D

bi-convex

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23

Two plane mirrors are inclined to each other such that an object placed between them has 11 images. Determine the angle of inclination 

A

30°

B

45°

C

60°

D

90°

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24

The pitch of a note is not affected by

A
frequency
B
tension in a vibrating string
C
mass of a vibrating string
D
amplitude of sound wave
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25

When two flat plate conductors are arranged in such a way that they possess equal and opposite charges seperated by a dielectric, they form a/an

A
electroscope
B
electrophorus
C
capacitor
D
cell
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26

Which electrical device is illustrated above?

A
a.c. generator
B
a.c. motor
C
d.c. generator
D
d.c. motor
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27

A simple barometer is constructed using a liquid \(Q_{1}\) of density 16.2\(g/cm^{3}\). Calculate the least lenth of the tube to be used to measure pressure of 1.5atm.  [Density of mercury = 13.6\(g/cm^{3}\), 1atm = 76.0 cm of Mercury]

A
1358mm
B
957mm
C
760mm
D
638mm
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28

A bar AB is balanced horizontally on two knife edges as illustrated as in the diagram above. Determine the weight of the bar.

A
10.0N
B
20.0N
C
40.0N
D
50.0N
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29

To obtain a virtual, erect and magnified image from a thin converging lens, an object must be placed 

A
between the focus and the lens
B
at the focus
C
between the focal length and twice the focal length
D
beyond twice the focal length
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30

The diagram above represents a transverse travelling wave. Which two points are 180° out of phase?

A
A and E
B
B and D
C
C and F
D
D and H
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