Pearson Edexcel International GCSE (9–1) · PHYSICS · Chapter
Density and Pressure
72 practice questions
Topics covered
Practice questions
31–36 of 36 · Normal
Question 31
2 marks · Normal
Answer and see the solution →A mercury column in a barometer stands at 0.60 m high. The density of mercury is 13,600 kg/m³. Use g = 10 N/kg.
Calculate the atmospheric pressure in Pascals.
Question 32
4 marks · Normal
Answer and see the solution →A reservoir contains a liquid with density . The reservoir is 15 m deep. Take .
(a)[2 marks]Calculate the pressure difference between the surface and the bottom of the reservoir.
(b)[2 marks]If a pipe runs from the bottom of the reservoir up to a point 7.5 m above the surface, what is the pressure difference between the bottom of the reservoir and the outlet of the pipe? Explain your reasoning.
Question 33
5 marks · Normal
Answer and see the solution →(a)[2 marks]A glass block has dimensions 0.2 m × 0.10 m × 0.05 m and a mass of 2.5 kg. Calculate the density of the glass. State the correct unit.
(b)[3 marks]The block is laid flat on a table. Calculate the pressure it exerts on the table. Give your answer in pascals.
Question 34
4 marks · Normal
Answer and see the solution →The table shows mass and volume measurements for three different liquids. Liquid Mass (g) Volume (cm^3) A 55 50 B 44 50 C 120 100 (a)[2 marks]For each liquid, calculate its density in g/cm³. Write your answers in the table below.
Liquid Density (g/cm³) A B C (b)[2 marks]Liquid B is poured into a tank to form a layer 0.15 m deep. Calculate the pressure at the base of the tank caused by this layer. (Take gravitational field strength as 10 N/kg. Give answer in pascals. 1 g/cm³ = 1000 kg/m³.)
Question 35
4 marks · Normal
Answer and see the solution →A diver descends to a depth of 25 m in the sea. The density of seawater is 1050 kg/m³.
(a)[2 marks]Calculate the increase in pressure on the diver at this depth due to the water alone. Use g = 10 N/kg. Give your answer in kPa.
(b)[2 marks]State and explain why the pressure inside the diver's air tank must be greater than the pressure at this depth.
Question 36
5 marks · Normal
Answer and see the solution →A student is investigating the density of a small irregular-shaped stone. She records the following measurements:
Measurements taken by the student. Measurement Value Mass of stone 65 g Initial volume of water in measuring cylinder 85 cm³ Final volume of water + stone 107 cm³ (a)[1 mark]Calculate the volume of the stone.
(b)[2 marks]Calculate the density of the stone in g/cm³.
(c)[2 marks]If the stone is placed on a sandy surface and exerts a downward force equal to its weight, with a contact area of 1.3 cm², calculate the pressure (in Pa) the stone exerts on the sand. (Take g = 10 N/kg; 1 cm² = 0.0001 m²)