Chapter 5 Practice Paper: Pressure — question paper (print)

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Secondary 3 · Physics (G2 / G3)

Chapter 5 Practice Paper

Pressure

Duration: 40 minutes

Total: 30 marks

Name:

Class:

Date:

READ THESE INSTRUCTIONS FIRST

Write your name, class and register number in the spaces at the top of this page.
Answer all questions.
Give numerical answers correct to 3 significant figures unless stated otherwise, with units where a quantity is calculated.
Take the acceleration of free fall g as 10 m/s² unless stated otherwise.
The number of marks is given in brackets [ ] at the end of each question or part question.
The total number of marks for this paper is 30.

Original practice material written for the MOE Physics syllabus. It is not an official MOE or school examination paper. Pressure = force/area, hydraulic systems, density, liquid-column pressure, barometers and manometers.

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

Section A: Multiple-choice questions[10 marks]

Choose the one correct answer for each question.

1
A pressure of one pascal (Pa) equals
1. Aone newton per square centimetre
2. Bone newton per square metre
3. Cone kilogram per square metre
4. Done joule per metre
( )
2
A girl of weight 400 N stands on snow shoes with a total contact area of 0.080 m². The pressure she exerts on the snow is
1. A32 Pa
2. B320 Pa
3. C5000 Pa
4. D32 000 Pa
( )
3
In a hydraulic system a small force on a small piston can lift a car because
1. Athe liquid multiplies the energy put in
2. Bpressure applied to an enclosed liquid is transmitted equally in all directions
3. Cthe large piston moves faster than the small one
4. Dthe liquid becomes denser under the car
( )
4
The pressure at the bottom of a 5.0 m deep pool of water (density 1000 kg/m³) is, taking g = 10 N/kg,
1. A50 Pa
2. B500 Pa
3. C5000 Pa
4. D50 000 Pa
( )
5
A metal block has mass 270 g and volume 100 cm³. Its density is
1. A2.7 g/cm³
2. B0.37 g/cm³
3. C27 g/cm³
4. D27 000 g/cm³
( )

Section B: Structured questions[20 marks]

Answer all questions in the spaces provided.

1
A man of weight 720 N stands on two feet of total contact area 0.030 m². Take g = 10 N/kg.
1. (a)
  Calculate the pressure he exerts on the ground.
  pressure =Pa[2]
2. (b)
  He now stands on one foot of area 0.015 m². State and calculate the new pressure.
  pressure =Pa[2]
3. (c)
  Calculate his mass.
  mass =kg[1]
4. (d)
  State one way he could reduce the pressure he exerts on soft ground without changing his weight.
  [1]
2
A hydraulic lift has a small piston of area 0.0020 m² and a large piston of area 0.050 m². A mechanic pushes the small piston with 40 N.
1. (a)
  Calculate the pressure transmitted through the liquid.
  pressure =Pa[2]
2. (b)
  Calculate the force produced on the large piston.
  force =N[2]
3. (c)
  The large piston rises 2.0 cm. Explain how the principle of conservation of energy applies to the distance the small piston moves.
  [3]
3
A glass U-tube manometer contains water of density 1000 kg/m³ and is connected to a gas supply. The water level on the gas side is 16 cm lower than the open side, i.e. the gas pushes the water 0.16 m down on its side.
1. (a)
  State what the 0.16 m level difference tells you about the gas pressure compared with the atmosphere.
  [1]
2. (b)
  Calculate, in pascals, how much the gas pressure exceeds atmospheric pressure.
  excess pressure =Pa[2]
3. (c)
  Taking atmospheric pressure as 101 kPa, state the total pressure of the gas supply in pascals.
  pressure =Pa[1]
4. (d)
  The manometer is refilled with a liquid of density 800 kg/m³. Calculate the new height difference for the same gas pressure.
  height =m[3]

— End of paper —