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HIA International — Grade 7

Unit 1: Breathing and respiration

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Unit 2: Dissolving, solubility and chromatography

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Unit 3: Forces, motion and pressure

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Unit 4: Ecosystems

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Unit 5: Atoms, purity and climate

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Unit 6: Light and objects in space

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Unit 7: Nutrition, health and movement

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Unit 8: Energy changes and reactions of metals

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Unit 9: Magnetism and electromagnets

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Quiz

3.6 Pressure In Liquids And Gases

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Pressure In Liquids And Gases Checkpoint Physics quiz: free practice for Cambridge Checkpoint Physics 0893. Work through this Pressure In Liquids And Gases Checkpoint Physics quiz and get instant feedback on every answer. If you get stuck, review the 2.6 Pressure in liquids and gases lesson. More practice: Cambridge Checkpoint Physics 0893 — all units. Syllabus: Cambridge Lower Secondary programme.

  • Questions count: 50
  • Passing grade: B+
  • Time limit:
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1.
Juan measured the pressure at the bottom of four tanks of water. Which conclusion is supported by the table?
Wider tanks give a greater pressure because they hold more water
Pressure depends on depth, not on tank width
Narrow tanks give a greater pressure because the water is squeezed
Pressure depends on both width and depth equally
2.
A car designer is choosing between oil and air to fill the brake pipes. Which is the best reason for choosing oil?
Air would work better because gas particles move faster than liquid ones
Oil is almost incompressible, so it passes the pressure on
Oil is chosen because liquid pressure only acts downwards onto the brakes
Oil is heavier, so its weight pushes the brake pads without a pedal
3.
Each option pairs a change made to a trapped gas with its effect. Which pairing is correct?
Compressed at fixed temperature – pressure decreases
Heated at fixed volume – pressure increases
Cooled at fixed volume – particles hit walls harder
Volume increased – particles hit walls more often
4.
The deep end of a school swimming pool is 3.5 m deep. What is the pressure on the floor there due to the water alone? (density 1000 kg/m³, g = 10 N/kg)
3500 pascals
350 000 pascals
35 pascals
35 000 pascals
5.
Ella repeats the three-hole bottle experiment to show that pressure increases with depth. To make it a fair test, what must be the same for all three holes?
The size of each hole
The depth of each hole
The distance each jet travels
The time each hole is covered
6.
Ella removed the tape from three holes X, Y and Z in a bottle full of water. The diagram shows the jets. What does the pattern of the jets show?
Dr Dabour Hub Academy - figure 1
Pressure in the water increases with depth
Pressure in water acts only downwards, not sideways
Water near the bottom is heavier than water at the top
Pressure in the water is the same at every depth
7.
Mr Haddad checked his tyres before and after a long drive, as shown in the table. No air was added. Which explanation of the change is correct?
The air particles grew larger when warm and pushed harder on the tyre walls
More air particles were forced into the tyre as the wheels kept turning
The air particles moved faster, hitting the walls harder and more often
The hot air particles collided with each other more, and that caused pressure
8.
Each option pairs an instrument with what it measures. Which pairing is correct?
Depth gauge – temperature of air
Barometer – air pressure
Barometer – depth of water
Tyre gauge – density of rubber
9.
A weather balloon measured atmospheric pressure as it rose. Which statement best describes the data in the graph?
Dr Dabour Hub Academy - figure 2
Pressure falls by exactly the same amount for every kilometre
Pressure rises with height because the balloon nears the Sun
Pressure falls with height, but falls more slowly higher up
Pressure falls quickly at first, then stays steady above 5 km
10.
Tariq drinks juice through a straw. Which explanation of why the juice moves up the straw is correct?
He lowers the air pressure in the straw, so air pressure outside pushes juice up
His sucking pulls the juice particles up by attracting them towards his mouth
The juice pressure increases with height, so it rises up the straw by itself
The air pressure inside the straw becomes higher than outside, lifting the juice
11.
Grace pushed hard on two sealed syringes, one filled with air and one with water. What do her results in the table show?
Water particles are bigger than air particles, so they block the plunger
Liquids can be compressed more easily than gases
Air particles are destroyed when the plunger is pushed in
Gases can be compressed but liquids almost cannot
12.
Gases can be compressed because:
They have no mass
Their particles are far apart
Their particles touch
They are solid
13.
When a gas is heated in a sealed container, the pressure increases because particles:
Stop moving
Move faster and hit the walls harder
Turn into liquid
Get bigger
14.
Engineers must choose one of the three dam wall designs in the diagram for a deep reservoir. Which is the best choice?
Dr Dabour Hub Academy - figure 3
Design 1, as the water pushes hardest on the top of the wall
Design 2, as water pressure is equal at every depth
Design 1, as a thick top stops waves spilling over the wall
Design 3, as it is thickest where the pressure is highest
15.
Water pressure is greater at the bottom of a dam because:
Air pushes less
Water is lighter there
Pressure increases with depth
The dam is thinner
16.
The graph shows how the pressure due to the liquid changes with depth in water and in liquid K. Using g = 10 N/kg, what is the density of liquid K?
Dr Dabour Hub Academy - figure 4
1000 kg/m³
150 kg/m³
15 000 kg/m³
1500 kg/m³
17.
Air pressure at the surface of a lake is 100 000 Pa. What is the total pressure on a diver 10 m below the surface? (water adds 10 000 Pa per metre)
100 000 pascals
110 000 pascals
1 000 000 pascals
200 000 pascals
18.
Use the table and g = 10 N/kg. In a deep tank of cooking oil, at what depth is the pressure due to the oil 20 000 Pa?
2.0 metres
2.5 metres
1.6 metres
0.25 metres
19.
Diego heated a sealed flask of air in a water bath and read a pressure sensor, as graphed. If the same pattern continues, what would the pressure be at 100 °C?
Dr Dabour Hub Academy - figure 5
128 kilopascals
121 kilopascals
135 kilopascals
200 kilopascals
20.
Kai pushed the plunger of a sealed syringe slowly, keeping the temperature steady. Which statement describes the pattern in his results?
Halving the volume halves the pressure
Pressure rises 100 kPa for every 10 cm³ less
Halving the volume doubles the pressure
Volume and pressure rise and fall together
21.
The diagram shows a hydraulic lift filled with oil. A 25 N push is applied to the small piston. What force does the oil exert upwards on the large piston?
Dr Dabour Hub Academy - figure 6
25 newtons
125 newtons
3750 newtons
750 newtons
22.
Each option pairs an application with the idea behind it. Which pairing is correct?
Dam thicker at the base – pressure rises with depth
Car brakes use oil – gases cannot be compressed
Ears pop in a plane – air pressure rises with height
Suction cup – liquid pressure acts downwards only
23.
Each option pairs an observation with its particle explanation. Which pairing is correct?
Balloon stays round – particles only hit the top of it
Balloon stays round – particles hit every part of its wall
Tyre gets harder when hot – particles get larger
Bottle collapses when cooled – particles pull the wall in
24.
Ms Osei heats a can with a little water until steam fills it, then quickly turns it upside down into cold water using tongs. The can is crushed. Why?
Cold water particles pull the metal inwards by attracting the can walls
Steam inside condenses, so the air outside pushes harder than the gas inside
The heat makes the metal weak, so the can collapses under its own weight
The steam particles shrink when cooled and pull the walls of the can in
25.
Both containers in the diagram hold the same gas at the same temperature. How does the gas pressure in container B compare with container A, and why?
Dr Dabour Hub Academy - figure 7
Higher in B, because its particles move much faster
Higher in A, because its particles have room to speed up
Higher in B, as particles hit its walls more often
The same, because both have the same number of particles
26.
A garage wants the jack in the table that produces the largest lifting force. Which design should it choose?
Design B, with an output of 600 N
Design C, with an output of 800 N
Design A, with an output of 1000 N
Design D, with an output of 900 N
27.
Which term is described as: what gas particles do when they hit the walls of their container?
collide
sea level
gravity
dam
28.
In a hydraulic jack, a small force on the small piston produces a _____ force on the large piston.
much smaller
exactly equal
backwards pulling
much larger
29.
A barometer is an instrument used to measure _____.
atmospheric pressure
depth of water
force on a piston
the density of liquids
30.
Gas particles cause pressure by moving randomly and _____ with the walls.
freezing
dissolving
colliding
melting
31.
In the bottle experiment, the holes are covered with _____ while the bottle is being filled with water.
strips of tape
a layer of oil
a paper towel
a sheet of glass
32.
Air in a bicycle pump can be squashed into a smaller volume because _____.
its particles are far apart
its particles are very tiny
its particles stop moving
its particles shrink when pushed
33.
Pressure in a liquid is equal in all _____.
containers
temperatures
depths
directions
34.
Adding more gas particles to a balloon _____ the pressure inside.
decreases
halves
removes
increases
35.
A diver 20 m down in the sea experiences a greater water pressure than a diver 20 m down in a freshwater lake. True or false?
True – the statement is correct
False – the depth is the same, so pressure is the same
False – fresh water is denser than sea water
True, but only because sea water is colder
36.
Water pressure increases with depth.
True
False
37.
Water from a high gap in a dam comes out with more force than water from a low gap. - True or false?
True
False
38.
Particles in a liquid move randomly in all directions, so pressure in a liquid is equal in all directions. - True or false?
True
False
39.
Deeper in a liquid there is more liquid above, and its weight pushes on the particles below. - True or false?
True
False
40.
A hydraulic car jack would work just as well if the oil were replaced with air. True or false?
True – the statement is correct
True, because air particles move faster
True, because air is lighter than oil
False – the air would be compressed
41.
Each extra metre of depth in water adds roughly 10 000 Pa to the pressure. True or false?
False – each metre adds about 1000 Pa
False – each metre adds about 100 Pa
False – depth has no effect on pressure
True – the statement is correct
42.
At sea level, the atmosphere presses on everything with a pressure of about 100 000 Pa. True or false?
False – it is about 100 Pa
True – the statement is correct
False – air has no weight so no pressure
False – it is about 10 000 000 Pa
43.
At 300 m below the sea surface, the pressure due to the water is six times as great as at 50 m. True or false?
False – it is only 250 times greater
False – water pressure is the same at all depths
False – it is 36 times as great
True – the statement is correct
44.
The label on a deodorant can warns "Do not heat", because heating raises the gas pressure inside and the can could burst. True or false?
False – heating lowers the pressure inside
False – gases cannot exert pressure in cans
True – the statement is correct
True, but only if the can is empty
45.
Gas pressure is caused by gas particles colliding with each other in the middle of a container. True or false?
True – the statement is correct
False – it is caused by hits on the walls
True, because collisions make particles bigger
True, but only in very hot gases
46.
Heating a gas makes its particles bigger, and this is what increases the pressure. True or false?
True – the statement is correct
False – the particles move faster instead
True, because hot particles weigh more
True, but only in a sealed container
47.
In the three-hole bottle experiment, the water level should be kept topped up, because a falling level makes all the jets shorter during the test. True or false?
False – the water level has no effect on the jets
False – a falling level makes the jets longer
True – the statement is correct
True, but only for the top hole
48.
Blowing more air into a balloon increases the pressure inside it. - True or false?
True
False
49.
Particles in a liquid move only downwards, so pressure acts only downwards. - True or false?
True
False
50.
When a sealed plastic bottle of warm air is put in a freezer, it gets squashed because the particles inside hit the walls less often and less hard. True or false?
True – the statement is correct
False – cold particles become smaller
False – the freezer sucks the walls inwards
True, but only because the plastic shrinks
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Part of Unit 3: Forces, motion and pressure — see every lesson and quiz in this unit.
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