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WA2 Practice Paper: Weighted Assessment 2 — question paper

QuizQuipPractice Series
QQ/S3PH/WA2

Secondary 3 · Physics (G2 / G3)

WA2 Practice Paper

Weighted Assessment 2

Duration: 55 minutes
Total: 40 marks
Name:
Class:
Register No.:
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 g = 10 N/kg.
  • 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 40.

Original practice material written for the MOE Physics syllabus. It is not an official MOE or school examination paper. Chapters 4–6 (turning effects of forces; pressure; energy, work and power).

For Examiner’s Use
Section A/ 10
Section B/ 30
Total/ 40

Section A: Multiple-choice questions[10 marks]

Answer all questions. For each question, write the letter (A, B, C or D) of the correct answer.

  1. 1

    The SI unit of the moment of a force is the

    1. Anewton per metre
    2. Bnewton metre
    3. Cjoule per second
    4. Dmetre per newton
    ( )
  2. 2

    A 300 N child sits 2.0 m from the pivot of a balanced seesaw. A 200 N child sits on the other side, at a distance of

    1. A1.3 m
    2. B2.0 m
    3. C4.5 m
    4. D3.0 m
    ( )
  3. 3

    An object is in stable equilibrium when its centre of gravity is

    1. Aas high as possible above a narrow base
    2. Blow, with a wide base
    3. Coutside the base of support
    4. Ddirectly above the heaviest point
    ( )
  4. 4

    One pascal (Pa) is equivalent to

    1. Aone newton per square metre
    2. Bone newton metre
    3. Cone kilogram per square metre
    4. Done joule per metre
    ( )
  5. 5

    A water barometer would need a column about 10 m tall because water

    1. Ais less dense than mercury
    2. Bexpands when warmed
    3. Chas a much lower density than mercury, so a much taller column is needed for the same pressure
    4. Dcannot exert pressure
    ( )
  6. 6

    In a hydraulic press a small force on a small piston produces a large force on a large piston because

    1. Athe large piston has a larger area, so the same pressure gives a bigger force
    2. Bthe liquid multiplies pressure equally in all directions
    3. Cenergy is created inside the liquid
    4. Dthe large piston moves faster
    ( )
  7. 7

    A ball falls freely towards the ground. During the fall, its energy changes from

    1. Akinetic to gravitational potential
    2. Belastic to thermal
    3. Cgravitational potential to kinetic
    4. Dkinetic to chemical
    ( )
  8. 8

    A crate is pushed 3.0 m along the floor by a horizontal force of 50 N. The work done by the force is

    1. A17 J
    2. B53 J
    3. C0.060 J
    4. D150 J
    ( )
  9. 9

    A motor converts 600 J of energy in 20 s. Its useful power output, assuming no losses, is

    1. A0.033 W
    2. B30 W
    3. C600 W
    4. D12 000 W
    ( )
  10. 10

    A machine receives 400 J of energy and delivers 100 J of useful output. Its efficiency is

    1. A50%
    2. B75%
    3. C25%
    4. D400%
    ( )

Section B: Structured questions[30 marks]

Answer all questions in the spaces provided.

  1. 1

    A uniform metre rule is balanced at its centre (the 50 cm mark). A 2.0 N weight hangs from the 20 cm mark and a 3.0 N weight hangs from the 70 cm mark, on opposite sides.

    1. (a)

      State the principle of moments.

      [2]
    2. (b)

      Show by calculation that the rule is balanced.

      [3]
    3. (c)

      The 3.0 N weight is now moved to the 65 cm mark. State and explain which way the rule rotates.

      [2]
  2. 2

    A rectangular block of mass 48 kg measures 0.50 m × 0.40 m × 0.10 m and rests on a horizontal table on its largest face.

    1. (a)

      Calculate the weight of the block.

      weight =N[2]
    2. (b)

      Calculate the contact area of the largest face.

      area =m²[1]
    3. (c)

      Calculate the pressure the block exerts on the table.

      pressure =Pa[2]
    4. (d)

      The block is stood on its smallest face (0.40 m × 0.10 m). Calculate the new pressure and state how it compares.

      [2]
  3. 3

    A swimming pool is 2.0 m deep. The density of water is 1000 kg/m³, atmospheric pressure is 100 000 Pa, and g = 10 N/kg.

    1. (a)

      Calculate the pressure due to the water alone at the bottom of the pool.

      pressure =Pa[2]
    2. (b)

      Calculate the total pressure at the bottom, including the atmosphere.

      total pressure =Pa[1]
    3. (c)

      Explain why a dam wall is built thicker at the bottom than at the top.

      [2]
    4. (d)

      In a hydraulic system the small piston has area 0.0010 m² and the large piston 0.050 m². A 100 N force acts on the small piston. Calculate the force produced on the large piston.

      force =N[3]
  4. 4

    A motor lifts a 12 kg load through a height of 5.0 m in 10 s. The electrical energy supplied to the motor in that time is 1200 J.

    1. (a)

      Calculate the useful work done by the motor.

      work =J[2]
    2. (b)

      Calculate the useful power output of the motor.

      useful power =W[2]
    3. (c)

      Calculate the efficiency of the motor.

      efficiency =%[2]
    4. (d)

      Calculate the energy wasted by the motor during the 10 s and name one place where it goes.

      [2]

— End of paper —