Pearson Edexcel International GCSE (9–1) · PHYSICS · Unit
Solids, Liquids and Gases
279 practice questions
Topics covered
Practice questions
51–60 of 144 · Normal
Question 51
2 marks · Normal
Answer and see the solution →A gardener stands on soft ground with both feet, exerting a total force of 700 N downwards. The combined area of both boots in contact with the ground is 0.36 m². Calculate the pressure exerted on the ground. Give your answer to 2 significant figures.
Question 52
4 marks · Normal
Answer and see the solution →A rectangular block of wood has a mass of 4.5 kg. It is placed flat on the ground so that it touches the floor with its largest face. The area of this face is 0.3 m².
(a)[1 mark]Calculate the weight of the block. (Take g = 10 N/kg.)
(b)[2 marks]Calculate the pressure the block exerts on the ground. Give the unit.
(c)[1 mark]If the block is stood on its smallest face of area 0.05 m², calculate the new pressure exerted on the ground.
Question 53
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 54
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 55
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 56
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 57
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 58
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 59
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 60
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.