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- 1. Multiple Choice
The diagram shows a mercury barometer, which is used to measure atmospheric pressure. As the atmospheric pressure decreases, which distance decreases?
AB
CD
DE
BD
- 2. Multiple Choice
A woman is in contact with the floor. At which of these poses does she produce the most pressure on the floor?
A
B
C
D
- 3. Multiple Choice
Which of the following combinations of forces when applied to a surface and area over which it acts gives the smallest pressure exerted on the surface?
F = 40 N; A = 0.5 m2
F = 40 N; A = 2.0 m2
F = 80 N; A = 0.5 m2
F = 80 N; A = 2.0 m2
- 4. Multiple Choice
The diagram shows a mercury barometer. The atmospheric pressure increases. What happens to the level of mercury at X and at Y?
X - falls; Y - rises
X - rises; Y - rises
X - falls; Y - falls
X - rises; Y - falls
- 5. Multiple Choice
There is a significant risk to submarines which dive to very great depths. Why is it dangerous to do this?
The temperature of water is too low at greater depths
The density of water is less at grater depths
The pressure is too great at greater depths
The gravitational pull increases at greater depths
- 6. Multiple Choice
A horizontal plate of area 0.036 m2 is beneath the surface of a liquid of density 930 kg/m3. The force on the plate due to the pressure of the liquid is 290N. What is the depth of the plate beneath the surface of the liquid?
0.87 m
1.13 m
8.7 m
9.1 m
- 7. Multiple Choice
The pressure at sea level is approximately 100 000 Pa. The density of sea water is 1030 kg/m3. What is the approximate pressure 80 m below the surface of the sea?
100 000 Pa
180 000 Pa
800 000 Pa
900 000 Pa
- 8. Multiple Choice
The density of mercury is . The pressure difference between the bottom and the top of a column of mercury is 100 kPa. What is the height of the column?
0.74 m
1.3 m
7.5 m
72 m
- 9. Multiple Choice
A diver under water uses breathing apparatus at a depth where the pressure is . A bubble of gas breathed out by the diver has a volume of when it is released. The bubble moves upwards to the surface of the water. At the surface of the water the atmospheric pressure is 100 kPa. The temperature of the water is the same at all depths. What is the volume of the bubble when it reaches the surface?
- 10. Multiple Choice
A student places his thumb firmly on the outlet of a bicycle pump to stop the air from coming out. What happens to the pressure and what happens to the volume of the air trapped as the pump handle is pushed in?
Pressure - decreases; Volume - decreases
Pressure - decreases; Volume - remains the same
Pressure - increases; Volume - decreases
Pressure - increases; Volume - remains the same
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