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WA1 Practice Paper: Weighted Assessment 1 — question paper

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QQ/S4PH/WA1

Secondary 4 · Physics (G2 / G3)

WA1 Practice Paper

Weighted Assessment 1

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.
  • 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 1–4 (general properties of waves; the electromagnetic spectrum; reflection and refraction of light; thin converging lenses).

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

    20 complete water waves pass a point in 4.0 s. The frequency of the waves is

    1. A0.20 Hz
    2. B5.0 Hz
    3. C16 Hz
    4. D80 Hz
    ( )
  2. 2

    A wave of frequency 5.0 Hz has a wavelength of 3.0 m. Its speed is

    1. A0.60 m/s
    2. B1.7 m/s
    3. C15 m/s
    4. D8.0 m/s
    ( )
  3. 3

    Which electromagnetic wave has the longest wavelength?

    1. Agamma rays
    2. Bultraviolet
    3. Cvisible light
    4. Dradio waves
    ( )
  4. 4

    Radiation from a remote control that carries coded signals to a television is

    1. Ainfrared radiation
    2. Bultraviolet radiation
    3. CX-rays
    4. Dmicrowaves
    ( )
  5. 5

    Sound travels from air into water. Compared with its speed in air, its speed in water is

    1. Asmaller
    2. Bthe same
    3. Clarger
    4. Dzero at the surface
    ( )
  6. 6

    A ray strikes a plane mirror. The angle of incidence is measured between the incident ray and the

    1. Amirror surface
    2. Bnormal to the mirror
    3. Creflected ray
    4. Dimage position
    ( )
  7. 7

    A light ray passes from air into glass. It bends

    1. Aaway from the normal, because glass is optically less dense
    2. Balong the normal, whatever the angle
    3. Cnot at all, since light cannot change speed
    4. Dtowards the normal, because glass is optically denser
    ( )
  8. 8

    A glass block has refractive index 1.5. Its critical angle is about

    1. A30°
    2. B48°
    3. C42°
    4. D60°
    ( )
  9. 9

    An object is placed beyond 2F of a thin converging lens. The image formed is

    1. Areal, inverted and diminished, between F and 2F on the far side
    2. Bvirtual, upright and magnified
    3. Creal, upright and the same size
    4. Dat infinity, always
    ( )
  10. 10

    An object 6.0 cm tall gives an image 12 cm tall on a screen. The magnification is

    1. A0.50
    2. B2.0
    3. C6.0
    4. D72
    ( )

Section B: Structured questions[30 marks]

Answer all questions in the spaces provided.

  1. 1

    Water waves in a ripple tank have a frequency of 4.0 Hz and a wavelength of 5.0 cm.

    1. (a)

      Define the frequency of a wave.

      [2]
    2. (b)

      Calculate the speed of the waves in m/s.

      speed =m/s[2]
    3. (c)

      The waves enter shallower water and slow to 0.15 m/s. Calculate the new wavelength and state what happens to the frequency.

      new wavelength =cm[3]
  2. 2

    A ray of light strikes a plane mirror at 30° to the mirror surface. It then passes towards a glass block of refractive index 1.52.

    1. (a)

      State the angle of incidence at the mirror.

      angle of incidence =[1]
    2. (b)

      State the law of reflection.

      [2]
    3. (c)

      The ray enters the glass block at 40° to the normal and refracts at 25°. Calculate the refractive index of the glass.

      refractive index =[3]
    4. (d)

      Calculate the speed of light in this glass.

      speed =m/s[2]
  3. 3

    A dentist’s aiming light guides a beam along a thin glass fibre (an optical fibre) of refractive index 1.5.

    1. (a)

      State the two conditions needed for total internal reflection to occur.

      [2]
    2. (b)

      Calculate the critical angle of the fibre glass.

      critical angle =[3]
    3. (c)

      Explain how the fibre keeps the light inside along its whole length.

      [3]
  4. 4

    A small lamp 6.0 cm tall stands 6.0 cm from a thin converging lens. A sharp image forms on a screen 12 cm from the lens.

    1. (a)

      Describe the image, stating three of its properties.

      [2]
    2. (b)

      Calculate the magnification.

      magnification =[2]
    3. (c)

      Calculate the focal length of the lens.

      focal length =cm[3]

— End of paper —