Pearson Edexcel International GCSE (9–1) · PHYSICS · Unit
Solids, Liquids and Gases
279 practice questions
Topics covered
Practice questions
271–279 of 279
Question 271
2 marks · Easy
Answer and check →Which of the following correctly describes the motion of particles in a liquid?
- A.Particles are very spread out and move slowly in fixed positions.
- B.Particles are tightly packed in a regular pattern and cannot move.
- C.Particles are close together but can move past each other at random.
- D.Particles are far apart and move rapidly with almost no attraction.
Question 272
4 marks · Easy
Answer and see the solution →A block of soap rests on a bathroom shelf. The mass of the soap is 200 g and its base measures 8.0 cm by 5.0 cm.
(a)[1 mark]Calculate the area of the base of the soap in m².
(b)[2 marks]Calculate the pressure the soap exerts on the shelf, stating the equation used.
(c)[1 mark]Give the correct SI unit for pressure.
Question 273
4 marks · Easy
Answer and see the solution →In an experiment, a student heats a 0.25 kg block of copper from 18 °C to 38 °C. The specific heat capacity of copper is 390 J/kg °C.
(a)[1 mark]State the equation used to calculate the change in thermal energy.
(b)[2 marks]Calculate the change in thermal energy of the copper block as it is heated.
(c)[1 mark]State what happens to the thermal energy supplied when the temperature of the copper block stops rising.
Question 274
6 marks · Normal
Answer and see the solution →A science teacher uses an ice block and an iron block to demonstrate differences in properties of solids and liquids. She measures the volume and mass of both blocks. Later, she places the iron block on a wooden bench and the ice block in water.
(a)[2 marks]State the equation to calculate the density of a substance, and name the correct SI unit for density.
(b)[2 marks]The iron block has a mass of 1.20 kg and a volume of 1.5 × 10⁻⁴ m³. Calculate the density of the iron block.
(c)[2 marks]When the iron block is placed on a wooden bench, it exerts a force of 12 N over an area of 0.006 m². Calculate the pressure applied to the bench by the iron block. Give your answer in Pa.
Question 275
5 marks · Normal
Answer and see the solution →A student observes the boiling of water and describes the random motion of bubbles inside it.
(a)[2 marks]Explain how the random motion of water molecules results in boiling and formation of bubbles.
(b)[2 marks]Describe, in terms of pressure, what happens to the bubbles as they rise towards the surface.
(c)[1 mark]State the property of pressure in liquids that explains why bubbles are spherical.
Question 276
5 marks · Normal
Answer and see the solution →A student places a wooden block on a bench and wants to find the pressure it exerts on the surface. After, she measures the density of a sample of oil.
(a)[3 marks]The wooden block has a mass of 2.5 kg and its base measures 0.10 m by 0.20 m. Calculate the pressure the block exerts on the bench. Give your answer in pascals (Pa).
(b)[2 marks]She uses a measuring cylinder to find the volume of a sample of oil. The oil mass is 50 g and its volume is 56 mL. Calculate the density of the oil in kg/m³.
Question 277
5 marks · Normal
Answer and see the solution →A glass tube contains a trapped sample of air. The pressure inside is recorded at different temperatures.
(a)[1 mark]Convert the temperature 25°C to Kelvin.
(b)[4 marks]The initial pressure is 100 kPa at 25°C. What is the pressure if the temperature rises to 75°C, assuming the volume and mass of air remain constant? (Give your answer in kPa, to 2 significant figures.)
Question 278
5 marks · Normal
Answer and see the solution →A metal block is being used in a laboratory investigation.
(a)[3 marks]Describe how you would use apparatus to determine the density of the metal block, including the measurements needed.
(b)[2 marks]The block has a mass of 480 g and its volume is found to be 60 cm³. Calculate its density in kg/m³.
Question 279
4 marks · Normal
Answer and see the solution →A laboratory demonstration shows the random motion of gas particles.
(a)[2 marks]Explain why gases exert pressure on the walls of their container, using the idea of particles.
(b)[2 marks]State and describe one property of gases which is evidence for the random motion of their particles.