Chapter 16 Practice Paper: Light, lenses and colour (Physics only) — question paper

Section A: Multiple-choice questions[10 marks]

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

1. 1

   A convex lens brings parallel rays together at the

   1. Aedge of the lens
   2. Bprincipal focus
   3. Cobject position
   4. Doptic nerve
   ( )
2. 2

   Magnification equals

   1. Aobject height ÷ image height
   2. Bfocal length ÷ wavelength
   3. Cimage height ÷ object height
   4. Dobject distance × image distance
   ( )
3. 3

   A microscope makes a 16 mm image of a mark that is actually 4.0 mm tall. The magnification is

   1. A4.0
   2. B0.25
   3. C64
   4. D12
   ( )
4. 4

   The angle of incidence is measured from

   1. Athe surface
   2. Bthe reflected ray
   3. Cthe normal
   4. Dthe light source
   ( )
5. 5

   A rough wall is visible from every angle because it reflects light

   1. Ain one sharp direction
   2. Bdiffusely, scattering it in many directions
   3. Cat the speed of sound
   4. Dwithout any absorption
   ( )
6. 6

   White light passes through a red filter. The beam that emerges is

   1. Ainvisible
   2. Bwhite but dimmer
   3. Cgreen
   4. Dred — only red was transmitted
   ( )
7. 7

   In the infrared practical, the surface emitting most radiation at one temperature is

   1. Aglossy white
   2. Bpolished silver
   3. Cmatte black
   4. Dclear glass
   ( )
8. 8

   A virtual image is one that

   1. Acannot be formed on a screen
   2. Bonly appears in photographs
   3. Cis always upside down
   4. Dis always smaller than the object
   ( )
9. 9

   A prism turns white light into a spectrum by

   1. Areflecting it twice
   2. Babsorbing red light
   3. Cpolarising it
   4. Ddispersing the colours by different amounts
   ( )
10. 10

    In the infrared practical a detector is moved closer to the cube without other changes. The reading rises because infrared intensity

    1. Aincreases with temperature only
    2. Bdepends on the room lighting
    3. Cis absorbed by the detector case
    4. Dincreases as the detector nears the source
    ( )

Section B: Structured questions[20 marks]

Answer all questions in the spaces provided.

1. 11

   A stamp collector views a 5.0 mm printed mark through a magnifying glass; the image appears 15 mm tall.

   1. (a)

      State the equation linking magnification, image height and object height.

      [1]
   2. (b)

      Calculate how many times bigger the image is than the mark.

      [2]
   3. (c)

      State three properties of this image.

      [2]
   4. (d)

      Name the type of lens used as a magnifying glass.

      [1]
2. 12

   A class investigates the law of reflection with a ray box, plane mirror and protractor sheet. One set of results: incidence 20° → reflection 20°; incidence 35° → reflection 35°; incidence 50° → reflection 51°.

   1. (a)

      Describe how the angles should be measured.

      [2]
   2. (b)

      State the conclusion the results support.

      [2]
   3. (c)

      The mirror is swapped for a sheet of white card. Explain why the reflected beam is now much harder to see.

      [3]
3. 13

   A student uses a Leslie cube of hot water (75 °C) and an infrared detector to compare its matte black, glossy black, matte white and polished silver faces. (Higher)

   1. (a)

      Describe the procedure for a fair comparison.

      [3]
   2. (b)

      Which face gives the strongest infrared reading, and which gives the weakest?

      [2]
   3. (c)

      Explain one reason the same ranking predicts how fast each face would cool in a cold room.

      [2]