Pearson Edexcel International GCSE (9–1) · PHYSICS · Section
Pressure in Liquids and Gases
16 practice questions
Practice questions
1–8 of 8 · Normal
Question 1
1 mark · Normal
Answer and see the solution →State what is meant by 'pressure at a point acts equally in all directions in a liquid at rest'.
Question 2
4 marks · Normal
Answer and see the solution →A deep-sea diver is submerged at a certain depth in a stationary sea. The pressure at the diver's position is measured in three directions: upwards, downwards, and horizontally.
(a)[2 marks]Explain why the pressure at a point in a stationary liquid is the same in each of these directions.
(b)[2 marks]If the diver is not moving and the water around them is stationary, what would you expect a pressure gauge to read if pointed in any of these three directions at the same point? Explain your answer.
Question 3
4 marks · Normal
Answer and see the solution →Figure 1 shows a metal can with several small holes at the same height, positioned around its base. The can is filled with water and the streams of water coming from each hole are observed.
Can with holes demonstrating liquid pressure. (a)[1 mark]Describe what will be observed from the holes when the can is filled with water.
(b)[3 marks]Explain how this experiment shows that pressure in a liquid acts equally in all directions at a certain depth.
Question 4
1 mark · Normal
Answer and check →Which statement is correct about the pressure inside a stationary gas contained in a sealed box?
- A.The pressure is the same in all directions at a point.
- B.The pressure is greater upwards than downwards.
- C.The pressure only acts downwards due to gravity.
- D.The pressure is zero at the sides.
Question 5
2 marks · Normal
Answer and see the solution →Explain, using the example of the Magdeburg hemispheres, how air pressure acts in all directions and what happens when the air is removed from inside the hemispheres.
Question 6
2 marks · Normal
Answer and see the solution →Some people think that atmospheric pressure only acts downwards. Give two reasons, based on everyday or laboratory evidence, that show atmospheric pressure acts equally in all directions.
Question 7
3 marks · Normal
Answer and see the solution →A laboratory set of Magdeburg hemispheres has a surface area of 0.060 m². The atmospheric pressure is 100,000 Pa.
(a)[2 marks]Calculate the total force acting on the outside of the hemispheres due to air pressure.
(b)[1 mark]Explain why the hemispheres cannot be pulled apart until air is let back in.
Question 8
2 marks · Normal
Answer and see the solution →Describe why a submarine must be designed with a strong hull when it dives deep in the ocean, with reference to liquid pressure acting at points on its surface.