The saturated vapour pressure of a liquid increases as the
Avolume of the liquid increases
Bvolume of the liquid decreases
Ctemperature of the liquid increases
Dtemperature of the liquid decreases
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Question 932
jamb1991
How long does it take a 750W heater to raise the temperature of 1kg of water from 20oC to 50oC [specific heat capacity of water = 4200Jkg-1K-1]
A84s
B112s
C168s
D280s
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Question 933
jamb1991
What is the difference in the amount of heat given out by 4kg of steam and 4kg of water when both are cooled from 100ºC to 80ºC? [the specific latent heat of steam is 2,260,000Jkg\(^{-1}\), specific heat capacity of water is 4200Jkg\(^{-1}\)K\(^{-1}\)]
A4200J
B2,260,OOOJ
C9,040,000J
D9,380,000J
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Question 934
jamb1991
A brass rod is 2m long at a certain temperature. What is the length for a temperature rise of 100K, if the expansivity of brass is 18 x 10-6K-1?
A2.0036m
B2.0018cm
C2.1800
D2.0360m
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Question 935
jamb1991
A thermometer with an arbitrary scale S, of equal division registers -30oS at the ice point and +90oS at the steam point. Calculate the Celsius temperature corresponding to 60oS
A25.0oC
B50.0oC
C66.7oC
D75.0oC
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Question 936
jamb1991
In which of the following is surface tension important?
Athe floating of a ship in water
Bthe floating of a dry needle in water
Cthe floating of a baloon in air
Dthe diffusion of sugar solution across a membrane
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Question 937
jamb1991
A pilot records the atmospheric pressure outside its plane as 63cm of Hg while a ground observer records a reading of 75cm of Hg for the atmospheric pressure on the ground. Assuming that the density of the atmosphere is constant, calculate the height of the plane above the ground. (Relative density of Hg = 13.0 and that of air = 0.00013)
A1200m
B6300m
C7500m
D13800m
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Question 938
jamb1991
The mass of a stone is 15.0g when completely immersed in water and 10.0g when completely immersed in a liquid of relative density 2.0. The mass of the stone in air is
A5.0g
B12.0g
C20.0g
D25.0g
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Question 939
jamb1991
The spiral spring of a spring balance is 25.0cm long when 5N hangs on it and 30cm long, when the weight is 10N. What is the length of the spring if the weight is 3N assuming Hooke's law is obeyed?
A15.0cm
B17.0cm
C20.0cm
D23.0cm
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Question 940
jamb1991
A 20kg mass is to be pulled up a slope inclined at 30o to the horizontal. If the efficiency of the plane is 75%, the force required to pull the load up the plane is [g = 10ms-2]
A13.3N
B73.5N
C133.3N
D53.2N
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Question 941
jamb1991
A wheel and axle have radii 80cm and 10cm respectively. If the efficiency of the machine is 0.85, an applied force of 1200N to the wheel will raise a load of
A8.0N
B6.8N
C8160N
D9600N
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Question 942
jamb1991
A spring of force constant 1500Nm-1 is acted upon by a constant force of 75N. Calculate the potential energy stored in the string
A1.9J
B2.8J
C3.45J
D0.43J
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Question 943
jamb1991
A body of mass 100g moving with a velocity of 10.0ms-1 collides with a wall. If after collision, it moves with a velocity of 2.0ms-1 in the opposite direction, calculate the change in momentum.
A0.8Ns
B1.2Ns
C12.0Ns
D80.0Ns
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Question 944
jamb1991
An object moves with uniform speed round a circle. Its acceleration has
Aconstant magnitude and constant direction
Bconstant magnitude and varying direction
Cvarying magnitude but constant direction
Dvarying magnitude and varying direction
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Question 945
jamb1991
A small metal ball thrown vertically upwards from the top of a tower with an initial velocity of 20ms-1. If the ball took a total of 6s to reach ground level, determine the height of the tower [g = 10ms-2]
A60m
B80m
C100m
D120m
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Question 946
jamb1991
A body of weight W N rest on a smooth plane inclined at an angle\(\theta\)o to the horizontal. What is the resolved part of the weight in Newtons along the plane?
AW sin\(\theta\)
BW cos\(\theta\)
CW sec\(\theta\)
DW tan\(\theta\)
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Question 947
jamb1991
Which of the following is the most suitable for use as an altimeter?
AA mecury barometer
BA fortin barometer
CA mecury manometer
DAn aneroid barometer
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Question 948
jamb1990
A force of 5N act at a point Y on a rod XYZ as shown in the diagram above, if XY is 2m. What is the moment of the force about point X?
A0Nm
B3Nm
C7Nm
D10Nm
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Question 949
jamb1990
What is the average velocity of the sprinter whose velocity time graph is as shown above
A85.0ms-1
B17.0ms-1
C8.5ms-1
D1.7ms-1
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Question 950
jamb1990
Two horizontal forces, 10N and 8N and another force F1 inclined at 30 to the vertical acting as shown in the diagram above, keep the body P in equilibrium, The weight of the body is
