Chapter 13 Practice Paper: Pressure in fluids (Physics only) — question paper (print)

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GCSE (9–1) · GCSE Physics (Physics only (separate science))

Chapter 13 Practice Paper

Pressure in fluids (Physics only)

Duration: 40 minutes

Total: 30 marks

Name:

Class:

Date:

READ THESE INSTRUCTIONS FIRST

Answer all questions.
Section A contains ten multiple-choice questions. Choose one answer, A, B, C or D, for each.
Section B contains structured questions. Write your answers in the spaces provided.
You may use a calculator. Take g = 9.8 N/kg and the density of water as 1 000 kg/m³.
The number of marks is given in brackets [ ] at the end of each question or part question.
The total mark for this paper is 30.

Original practice material written for the MOE GCSE Physics syllabus. It is not an official MOE or school examination paper. Chapter 13: pressure P = F/A, liquid pressure and depth, upthrust and floating, P = h ρ g (Higher), and atmospheric pressure (Physics only content).

For Examiner’s Use
Section A	/ 10
Section B	/ 20
Total	/ 30

Section A: Multiple-choice questions[10 marks]

Choose one answer for each question. Each question is worth 1 mark.

1
Pressure is best defined as
1. Aforce × area
2. Bforce per unit volume
3. Cforce per unit area
4. Darea per unit force
( )
2
One pascal equals one
1. Anewton per square metre
2. Bnewton-metre
3. Ckilogram per metre
4. Djoule per second
( )
3
A box of weight 60 N rests on a base of area 0.30 m². The pressure is
1. A18 Pa
2. B0.005 Pa
3. C63 Pa
4. D200 Pa
( )
4
Compared with the pressure near the surface of a lake, the pressure 3 m deeper is
1. Asmaller
2. Blarger
3. Cthe same
4. Dzero
( )
5
The upthrust on a submerged object equals
1. Athe object’s volume
2. Bthe object’s weight in air
3. Cthe weight of fluid displaced
4. Dthe fluid’s density alone
( )
6
A 600 N load spreads over a contact area of 0.020 m². The pressure is
1. A12 Pa
2. B620 Pa
3. C30 000 Pa
4. D0.000033 Pa
( )
7
As a helicopter climbs from sea level to 3 000 m, the atmospheric pressure it experiences
1. Afalls
2. Bdoubles
3. Cstays the same
4. Drises
( )
8
In the equation P = h ρ g, the symbol h stands for
1. Aheight above the liquid
2. Bthe object’s height
3. Chalf the density
4. Ddepth below the liquid surface
( )
9
A boat floats because the upthrust on it
1. Ais less than its weight
2. Bequals its weight
3. Cis zero at the surface
4. Ddepends on the boat’s colour
( )
10
Snow shoes let a walker cross soft snow because they
1. Areduce the walker’s weight
2. Bincrease the pressure on the snow
3. Creduce the contact area
4. Dspread the weight over a larger area, reducing the pressure
( )

Section B: Structured questions[20 marks]

Answer all questions in the spaces provided.

11
A skier of weight 700 N stands on both skis. Each ski has a contact area of 0.30 m² with the snow.
1. (a)
  State the equation linking pressure, force and area.
  [1]
2. (b)
  The skier lifts one ski. Calculate the pressure under the single ski.
  [2]
3. (c)
  Calculate the pressure when standing on both skis.
  [2]
4. (d)
  Explain the change between (b) and (c).
  [1]
12
A diver descends to 15 m in sea water of density 1 000 kg/m³ (g = 9.8 N/kg). Atmospheric pressure is 100 000 Pa. (Higher)
1. (a)
  State what each symbol represents in P = h ρ g.
  [2]
2. (b)
  Calculate the liquid pressure at 15 m.
  [2]
3. (c)
  Calculate the total pressure on the diver.
  [1]
4. (d)
  The diver’s eardrum has area 5.0 × 10⁻⁵ m². Calculate the force on it at 15 m.
  [2]
13
A rock weighs 24 N in air and 16 N when fully submerged in water of density 1 000 kg/m³ (g = 9.8 N/kg). (Higher)
1. (a)
  Calculate the upthrust on the rock.
  [1]
2. (b)
  Calculate the volume of water the rock displaces.
  [2]
3. (c)
  Calculate the mass and then the density of the rock.
  [3]
4. (d)
  Deduce whether the rock would float in water.
  [1]

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