2018 - WAEC Physics Past Questions and Answers - page 2
11
An object at rest is said to possess
A
potential energy
B
kinetic energy
C
chemical energy
D
electrical energy
12
According to Newton's law of cooling, the heat energy lost per unit area of a body depends on the
I. Surface area
II. Nature of the surface
III. Temperature of the surface
IV. Excess temperature over the surroundings
A
I and II only
B
II and IV only
C
I,II and III
D
I, II and IV
13
The graph of density against temperature for water is correctly illustrated by
A
I
B
II
C
III
D
IV
14
A football is kicked at an angle of 45° to the horizontal over a defense line up with a velocity of 15\(ms^{-1}\). Calculate the magnitudeof horizontal velocity of the ball at its highest point [Neglect friction, g = 10\(ms^{-2}\)].
A
0.0\(ms^{-1}\)
B
5.6\(ms^{-1}\)
C
10.6\(ms^{-1}\)
D
15.0\(ms^{-1}\)
15
The ice point on the absolute scale of temperature is
A
0K
B
32K
C
100K
D
273K
16
Which of the following factors does not increase the rate of evaporation of water in a lake?
A
Increase in the pressure of the atmosphere
B
Rise in temperature
C
Increase in the surface area of the lake
D
Increase in the speed of the wind
17
The bob of a simple pendulum takes 8.0s to complete 10 oscillations. Determine the frequency of oscillation of the bob.
A
0.125Hz
B
1.25Hz
C
7.50Hz
D
8.00Hz
18
The diagram above illustrates the mercury-in-glass thermometer used for determining the temperature of a room. Use the data on it to determine the room temperature.
A
3.3°C
B
7.0°C
C
13°C
D
30.0°C
19
Frequency is measured in
A
meter per second
B
seconds
C
hertz
D
farad
20
Which of the following electromagnetic waves is most energetic?
A
Radio waves
B
X-ray
C
Gamma rays
D
Ultra-violet rays
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