2013 - WAEC Physics Past Questions and Answers - page 2
11
From Newton's first law of motion,
A
a body can only undergo translational motion
B
once a body remains at rest no force acts on it
C
the net force acting in uniform linear motion is zero
D
a body's inertia is its weight
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12
A body of mass 11kg is suspended from a ceiling fan by an aluminum wire of length 2m and diameter 2mm. Calculate the elastic energy stored in the wire [Young's modulus of aluminum is 7.0 x 1010Nm-2, g = 10ms-2, \(\pi\) = 3.142]`
A
1.1 x 10-1J
B
5.5 x 10-2J
C
1.1 x 10-4J
D
5.5 x 10-8J
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13
The velocity ratio of an inclined plane
A
increases with increase in the angle of inclination
B
increases with decrease in the angle of inclination
C
decreases with decrease in the angle of inclination
D
is independent of the angle of inclination
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14
Which of the following types of thermometer is used for the calibration of other thermometers?
A
liqud-in-glass thermometer
B
constant volume gas thermometer
C
optical pyrometer
D
thermocouple
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15
The magnitude of the expansion or contraction of a substance depends on the i. temperature change ii. nature of the substance iii. size of the substance. Which of the statements above are correct?
A
i and ii only
B
ii and iii only
C
i and iii only
D
i, ii and iii
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16
Highly polished silvery surfaces are
A
poor absorbers and poor emitters of radiation
B
poor absorbers and good emitters of radiation
C
good absorbers and poor emitters of radiation
D
good absorbers and good emitters of radiation
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17
The volume of a given mass of gas at 27oC and 800 mmHg is 76cm2. Calculate its volume at s.t.p
A
100.0 cm3
B
72.8 cm3
C
60.0 cm3
D
36.4 cm3
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18
Ice of mass 10g at 5°C was completely converted to water at 0oC, calculate the quantity of heat used. [specific heat capacity of ice = 2.1 Jg\(^{-1}\)K\(^{-1}\), specific latent heat of fusion of ice = 336 Jg\(^{-1}\)]
A
105J
B
3255J
C
3465J
D
16821J
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19
An electric heater has a resistance of 50\(\Omega\). When it is immersed in water and connected to mains source, it draws a current of 4.0A. Calculate the heat gained by the water if the heater is switched on for 2 minutes, assuming no heat losses to the surroundings
A
400J
B
1600J
C
24000J
D
96000J
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20
When salt is dissolved in water, the freezing point of the water
A
increases
B
decreases
C
remains the same
D
increases and later decrease
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