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P11 Force and Pressure
1.
What does the word fluid mean?
a) a liquid
b) a gas
c) a molten solid
d) a liquid or gas
2.
What does the word normal mean in physics?
a) at right angles
b) standard conditions
c) usual properties
d) everyday occurrence
3.
What does the pressure in a fluid do to a surface it is in contact with?
a) Create a normal amount of force on the surface.
b) Make the surface accelerate.
c) Cause the surface to become pressurised.
d) Cause a force normal to the surface.
4.
Which of the following equations correctly links pressure (p), force (F) and area (A) ?
a) p = F/A
b) p = FA
c) F = p/A
d) F = A/p
5.
Which of the following is not a unit of pressure?
a) Pa
b) N/kg
c) N/m
2
d) kPa
6.
Calculate the pressure when a force of 12 N acts over an area of 4 m
2
a) 3 Pa
b) 48 Pa
c) 4 Pa
d) 0.33 Pa
7.
What force would be exerted by a pressure of 30 Pa acting over and area of 4 m
2
?
a) 7.5 N
b) 120 N
c) 0.13 N
d) 30 N
8.
A pressure of 20 Pa generates a force of 60 N. Calculate the area over which the pressures is acting.
a) 4 m
2
b) 1200 m
2
c) 0.33 m
2
d) 3 m
2
9.
Use the equation pressure = height x density x gravity to calculate the pressure at the base of a water tank that is 1.2 m deep. The density of water is 1000 kg/m
3
and gravity is 10 N/kg.
a) 1,200 Pa
b) 12,000 Pa
c) 120 Pa
d) 12 Pa
10.
The same tank is filled with oil resulting in a pressure of 6,000 Pa. Calculate the density of the oil using the equation pressure = height x density x gravity
a) 2000 kg/m
3
b) 250 kg/m
3
c) 500 kg/m
3
d) 100 kg/m
3
11.
A well has a pressure of 60 kPa at its deepest point. Water has a density of 1000 kg/m
3
and gravity is 10 N/kg. Calculate the depth of the well using the equation pressure = height x density x gravity
a) 60 cm
b) 6 m
c) 60 m
d) 16.6 m
12.
Calculate the pressure difference between points 1 m and 3 m depth in the well.
a) 2,000 Pa
b) 20,000 Pa
c) 400 Pa
d) 4,000 Pa
13.
Which of the following is the best explanation for the pressure in a liquid increasing as the depth increases?
a) Closer to the Earth gravity increases.
b) The deeper you go the more water there is.
c) Pressure is force over area and the area is smaller as you go deeper.
d) There is a greater weight of liquid to pushing down.
14.
Which of the following is the best explanation for the pressure at a given depth in a liquid increasing as the density of the liquid increases?
a) The greater the density the thicker the liquid.
b) The density of liquids increases significantly with pressure.
c) A higher density liquid will have a higher mass and weight. More weight pushes with a greater force and hence pressure.
d) Denser liquids always sink to the bottom.
15.
Which of the following is the best description of upthrust?
a) The upwards push caused by the force of buoyancy.
b) Upthrust is the opposite of downthrust.
c) The force caused by the difference in pressure on the top and bottom surfaces of a submerged object.
d) Upthrust is the force that is equal and opposite to the sinking force.
16.
Calculate the upthrust on a box of size 0.2m by 0.2m and a depth of 0.1m submerged in water. The density of water is 1000 kg/m
3
and gravity is 10 N/kg.
a) 4 N
b) 20 N
c) 2 N
d) 40 N
17.
What will happen to a submerged object whose weight is greater that the upthrust?
a) It will float.
b) It will become weightless.
c) It depends on the density of the liquid.
d) It will sink.
18.
What will happen to a submerged object whose weight is less than the upthrust?
a) It will float.
b) It will sink.
c) It will gain negative buoyancy.
d) It depends on the shape of the object.
19.
If an object is just about floating, and the density of the liquid it is floating in becomes less, what will happen to the object?
a) It will still float.
b) It will rise up out of the liquid.
c) It will sink.
d) It will sink and then float back up.
20.
Which of these is true about the Earth’s atmosphere?
a) It gets denser with increasing altitude.
b) It density does not depend on altitude but does depend on temperature.
c) It gets less dense with increasing altitude.
d) Relative to the size of the Earth the atmosphere is large.
21.
Which of the following is the best description as to how air pressure is caused?
a) Air molecules colliding with a surface.
b) Air pushing outwards.
c) The space between air molecules expanding.
d) Air molecules colliding with each other.
22.
As the height above ground level increases…
a) there are more air molecules so atmospheric pressure increases.
b) the air molecules become lighter so atmospheric pressure decreases.
c) the air molecules become heavier so atmospheric pressure increases.
d) there are fewer air molecules so atmospheric pressure decreases.
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