2011 - JAMB Physics Past Questions and Answers - page 2
11
A machine is used to lift a load of 20 N through a height of 10 m. if the efficiency of the machine is 40%, how much work is done?
A
80 J
B
500 J
C
300 J
D
120 J
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12
I. Density of the liquid.
II. Depth below the surface of the liquid.
III. Surface area of the liquid.
In which of the statement above will pressure be dependent?
II. Depth below the surface of the liquid.
III. Surface area of the liquid.
In which of the statement above will pressure be dependent?
A
I and II only.
B
II and III only.
C
I, II and III only.
D
I and III only.
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13
Which of the following could be effectively used to reduce friction?
A
kerosene
B
grease
C
water
D
petrol
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14
Which of the following types of waves needs a medium for propagation?
A
sound waves
B
light waves
C
radio waves
D
x - rays
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15
Which of the following electromagnetic waves has the highest frequency?
A
utra - violet rays
B
radio waves
C
x - rays
D
infrared - rays
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16
A perfect emitter or absorber of radiant energy is a
A
conductor
B
black body
C
white body
D
red body
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17
The ground is always cold at night because the
A
atmosphere absorbs the sun's energy at night
B
earth radiates heat to the atmosphere at night
C
sun no longer shine at night
D
atmosphere reflects the sun's energy at night
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18
A cannon is fired from town X,after how long is the sound heard at a town Y 4.95 km away?
[velocity of sound in the air = 330 ms-1]
[velocity of sound in the air = 330 ms-1]
A
30 s
B
10 s
C
10 s
D
15 s
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19
The phenomenon that shows that increase in pressure lowers the melting point can be observed in
A
sublimation
B
condensation
C
coagulation
D
regelation
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20
A block of aluminum is heated electrically by a 30 w heater if the temperature rises by 10°c in 5 minutes, the heat capacity of the aluminum is
A
900 JK-1
B
90 JK-1
C
100 JK-1
D
200 JK-1
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