2008 - JAMB Physics Past Questions and Answers - page 2
11
When cold water is poured on a can containing hot water, the can collapses because the
A
steam condeses and occupies the partial vacuum in the can
B
external air pressure counter balances the pressure within the can
C
steam expands to occupy the vacuum remaining in the can
D
external pressure becomes greater than the pressure within the can.
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12
An empty density bottle weighs 2 N. if its weighs 5 N when filled with water and 4 N when filled with olive oil, the relative density of olive oil is
A
(1)/3
B
(2)/3
C
(1)/5
D
(2)/5
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13
The thermometric properties of a thermocouple is the change in?
A
equivalent resistance
B
electromotive force
C
colour
D
pressure
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14
During summer, the balance wheel of a clock expands.what effect does this have on the accuracy of the clock?
A
the clock gians time
B
the accuracy of the clock is not affected
C
the clock losses time
D
the clock stops working
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15
A sealed flask contains 600cm3 of air at 27°C and is heated to 35°C at constant pressure. The new volume is?
A
508 cm3
B
516 cm3
C
608 cm3
D
616 cm3
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16
A block of aluminum is heated electrically by a 25 W heater. if the temperature rises by 10°C in 5 minutes, the heat capacity of the aluminum is?
A
850 JK-1
B
750 JK-1
C
650 JK-1
D
500 JK-1
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17
If the partial pressure of water vapour at 27°C is 18 mm Hg and the saturated vapour pressure of the atmosphere at the same temperature is 24 mm Hg, the relative humidity at this temperature is?
A
25%
B
33%
C
75%
D
82%
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18
In a good thermos flask, the main cause of heat loss is?
A
conduction through the cork
B
the plastic base of the thermos flask
C
the silvered walls and shiny metals
D
the outer cover or jacker
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19
Given the progressive wave equation y = 5 sin (2000 πt - 0.4x), calculate wave length
A
12.4 m
B
15.7 m
C
17.5 m
D
18.6 m
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20
The fundamental property of a propagating wave which depends only on the source and not the medium of propagation is the?
A
wavelength
B
harmonies
C
frequency
D
velocity
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