Pearson Edexcel International GCSE (9–1) · PHYSICS · Chapter
Units (Solids, Liquids and Gases)
69 practice questions
Topics covered
Practice questions
21–30 of 36 · Normal
Question 21
3 marks · Normal
Answer and see the solution →Describe how you could demonstrate that gases exert pressure using simple apparatus in the laboratory.
Question 22
4 marks · Normal
Answer and see the solution →The pressure due to the atmosphere is about 100,000 Pa. A rectangular hatch on a submarine has an area of 0.24 m².
(a)[2 marks]Calculate the total force exerted by the atmosphere on the hatch.
(b)[2 marks]The submarine dives so there is sea water on the other side. State one factor that will increase the force on the hatch.
Question 23
2 marks · Normal
Answer and see the solution →Some machines, such as bulldozers, use wide caterpillar tracks instead of wheels. Explain why this design helps the machines move on soft ground.
Question 24
2 marks · Normal
Answer and see the solution →Calculate the pressure at a depth of 6 m under oil of density 800 kg/m³. Take .
Question 25
4 marks · Normal
Answer and see the solution →A diver is swimming in a freshwater lake. The density of freshwater is . The gravitational field strength is .
(a)[3 marks]Calculate the pressure difference between the surface and a point 3.5 m below the surface.
(b)[1 mark]State two factors that would cause the pressure at the same depth in another liquid to be greater.
Question 26
2 marks · Normal
Answer and see the solution →Explain, using ideas about forces, why the pressure at the bottom of a swimming pool is greater than the pressure at the surface.
Question 27
4 marks · Normal
Answer and see the solution →A scientist designs a rectangular tank filled with oil. The base measures 0.80 m by 1.20 m. The oil has a density of 900 kg/m³. The height of the oil column is 2.0 m and g = 10 N/kg.
(a)[2 marks]Calculate the pressure difference between the top and bottom of the oil in the tank.
(b)[2 marks]Calculate the force exerted by the oil on the base of the tank.
Question 28
1 mark · Normal
Answer and check →Which row correctly shows the combination that would give the greatest pressure at the bottom of a liquid column, according to ?
- A.High h, low ρ, low g
- B.Low h, high ρ, low g
- C.Low h, low ρ, high g
- D.High h, high ρ, high g
Question 29
3 marks · Normal
Answer and see the solution →A student makes a homemade water barometer. The atmospheric pressure supports a column of water 10.0 m high. The density of water is 1000 kg/m³ and g = 10 N/kg.
(a)[2 marks]Calculate the pressure the atmosphere is applying to the water.
(b)[1 mark]State one reason why mercury is often used in barometers instead of water.
Question 30
4 marks · Normal
Answer and see the solution →The table gives data about liquid Y at different depths.
Depth / m Pressure difference / Pa 1.0 8500 2.0 17000 3.0 25500 (a)[3 marks]Calculate the density of liquid Y. Take g = 8.5 N/kg.
(b)[1 mark]Describe the relationship between depth and pressure difference in liquid Y.