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Light

37 Grade 6 Integrated Science questions on Light, with worked marking schemes. 37 questions are available on this topic in full.

  1. Question 1

    1 mark

    A learner moved a ball closer to a torch and its shadow on the wall became bigger. The shadow became bigger because the ball:

    A. Moved away from the light source

    B. Became transparent

    C. Blocked more of the light as it got closer to the source

    D. Started producing its own light

    (1 mark)

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  2. Question 2

    3 marks

    When a football is placed between a lit torch and a wall in a dark room, a shadow forms on the wall.

    (a) Explain how the shadow is formed. (2 marks)

    (b) State the property of light that makes it possible for shadows to form. (1 mark)

    (3 marks)

    Marking scheme

    (a) The football is an opaque object; it blocks/stops the light from the torch from reaching the wall, so a dark area (shadow) forms on the wall behind the ball (2 marks). (b) Light travels in straight lines (1 mark).

  3. Question 3

    1 mark

    An object that produces its own light is said to be:

    A. Opaque

    B. Translucent

    C. Non-luminous

    D. Luminous

    (1 mark)

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  4. Question 4

    1 mark

    When light hits a smooth, shiny surface, it bounces back. This is called

    A. refraction

    B. reflection

    C. absorption

    D. diffraction

    (1 mark)

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  5. Question 5

    1 mark

    Which surface would reflect light best?

    A. A dull brown wall

    B. A flat shiny mirror

    C. A rough black cloth

    D. A piece of wood

    (1 mark)

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  6. Question 6

    1 mark

    Which of the following is a natural source of light?

    A. A candle

    B. An electric bulb

    C. A torch

    D. The sun

    (1 mark)

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  7. Question 7

    3 marks

    Reflection of light is used in many everyday items.

    (a) Explain what is meant by reflection of light. (2 marks)

    (b) Give one everyday use of reflection of light. (1 mark)

    (3 marks)

    Marking scheme

    (a) Reflection is the bouncing back of light when it hits/strikes a surface (especially a smooth shiny surface) (2 marks). (b) Any one: using a mirror to see our image/appearance; car mirrors/side mirrors; a periscope; shiny surfaces/reflectors on vehicles and bicycles for safety at night (1 mark).

  8. Question 8

    4 marks

    A simple experiment can be used to show how light travels. Describe an experiment using three cards with holes (and a candle or torch) to show that light travels in straight lines. (4 marks)

    (4 marks)

    Marking scheme

    Make a small hole at the same height in the centre of each of three cards (1 mark). Arrange the three cards in a straight line so the holes are in line, with a candle/torch at one end (1 mark). When you look through the holes you can see the light/flame (1 mark); if one card is moved sideways so the holes are no longer in a straight line, the light can no longer be seen — this shows light travels in straight lines (1 mark).

  9. Question 9

    1 mark

    Light passes through transparent materials such as

    A. brick wall

    B. metal sheet

    C. clear glass

    D. cardboard

    (1 mark)

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  10. Question 10

    2 marks

    Taking care of our eyes and using light safely is important. State two safety rules to observe concerning light and our eyes. (2 marks)

    (2 marks)

    Marking scheme

    Any two (1 mark each): never look directly at the sun / very bright light; do not stare at welding light or bright bulbs; read/write in good/enough light; do not shine bright torch light into someone's eyes; wear sunglasses in very bright sunshine.

  11. Question 11

    1 mark

    Kiptoo shone a torch through a small hole and noticed that the beam of light moved in one direction only. This shows that light travels in:

    A. Zig-zag lines

    B. Circles

    C. Straight lines

    D. Curved lines

    (1 mark)

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  12. Question 12

    1 mark

    The bending of light as it passes from one medium to another is called

    A. reflection

    B. diffusion

    C. refraction

    D. absorption

    (1 mark)

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  13. Question 13

    1 mark

    A periscope uses

    A. one lens to magnify objects

    B. a battery to produce light

    C. two mirrors to see around corners or over obstacles

    D. a prism to split light

    (1 mark)

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  14. Question 14

    1 mark

    Which of the following is a non-luminous object?

    A. The moon

    B. A burning firewood

    C. A lit candle

    D. The sun

    (1 mark)

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  15. Question 15

    1 mark

    During a night power blackout, Mwikali used a device that makes its own light to find her way. Which of these is an artificial source of light?

    A. The sun

    B. A firefly

    C. The stars

    D. A torch

    (1 mark)

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  16. Question 16

    1 mark

    For safety, learners are warned NEVER to do which of the following?

    A. Use a lamp at night

    B. Read in good light

    C. Look directly at the bright sun

    D. Play outside during the day

    (1 mark)

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  17. Question 17

    4 marks

    After a rainy morning, learners saw a beautiful rainbow.

    (a) Name the source of light that produces a rainbow. (1 mark)

    (b) List any three colours seen in a rainbow. (3 marks)

    (4 marks)

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  18. Question 18

    1 mark

    Materials that allow some light to pass through but scatter it are called

    A. reflective

    B. translucent

    C. transparent

    D. opaque

    (1 mark)

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  19. Question 19

    3 marks

    A learner placed a stick upright in the school compound in the morning and again at noon, and noticed the shadow was long in the morning but short at noon. Explain why the length of the shadow changed during the day. (3 marks)

    (3 marks)

    Marking scheme

    The position/height of the sun in the sky changes during the day (1 mark). In the morning the sun is low in the sky, so the stick blocks the light to make a long shadow (1 mark); at noon the sun is high/almost overhead, so the shadow becomes short (1 mark).

  20. Question 20

    3 marks

    Materials can be transparent, translucent or opaque depending on how they allow light to pass. Give one example of a material for each type. (3 marks)

    (i) Transparent —

    (ii) Translucent —

    (iii) Opaque —

    (3 marks)

    Marking scheme

    (i) Transparent: clear/window glass, clean water, clear polythene (1 mark). (ii) Translucent: frosted glass, tracing/greaseproof paper, oiled paper, thin cloth (1 mark). (iii) Opaque: wood/wooden door, brick/wall, metal, stone, cardboard (1 mark).

  21. Question 21

    1 mark

    We are able to see objects around us because light from a source:

    A. Is stored inside our eyes

    B. Is made by the objects themselves

    C. Bounces off the objects into our eyes

    D. Comes only from our eyes

    (1 mark)

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  22. Question 22

    1 mark

    Which of the following is an opaque material?

    A. A sheet of clear polythene

    B. Clean water

    C. A clear glass tumbler

    D. A wooden table

    (1 mark)

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  23. Question 23

    3 marks

    Light is very useful in our daily lives. State three uses of light at home or in school. (3 marks)

    (3 marks)

    Marking scheme

    Any three (1 mark each): to see/for lighting rooms; for reading and writing/learning; to help plants make food (photosynthesis); for taking photographs; for signalling/warning (e.g. traffic lights, torches); for drying clothes/crops (sunlight); to see our reflection using mirrors.

  24. Question 24

    1 mark

    A rainbow is formed when sunlight is

    A. split into different colours by water droplets

    B. reflected by the moon

    C. absorbed by clouds

    D. blocked by buildings

    (1 mark)

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  25. Question 25

    1 mark

    Through which material can you see clearly because light passes through it completely?

    A. Clear window glass

    B. A brick wall

    C. A wooden door

    D. A frosted bathroom window

    (1 mark)

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  26. Question 26

    4 marks

    Sources of light can be grouped as natural or artificial.

    (a) Explain the difference between a natural and an artificial source of light. (2 marks)

    (b) Give one example of each. (2 marks)

    (4 marks)

    Marking scheme

    (a) A natural source of light occurs on its own in nature (not made by people), while an artificial source of light is made/produced by people (2 marks). (b) Natural: sun / stars / lightning / firefly. Artificial: torch / electric bulb / candle / lamp (1 mark each = 2 marks).

  27. Question 27

    4 marks

    Objects can be grouped as either luminous or non-luminous.

    (a) Explain the difference between a luminous and a non-luminous object. (2 marks)

    (b) Give one example of each. (2 marks)

    (4 marks)

    Marking scheme

    (a) A luminous object produces/gives out its own light, while a non-luminous object does not produce its own light (it only reflects light from other sources) (2 marks). (b) Luminous example: sun / candle / electric bulb / torch / firefly. Non-luminous example: moon / table / book / wall (1 mark each = 2 marks).

  28. Question 28

    1 mark

    When light hits a shiny surface and bounces back, this is called:

    A. Absorption

    B. Digestion

    C. Reflection

    D. Circulation

    (1 mark)

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  29. Question 29

    1 mark

    A plane mirror forms an image that is

    A. larger than the object

    B. smaller than the object

    C. the same size as the object but laterally inverted

    D. upside down

    (1 mark)

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  30. Question 30

    1 mark

    A shadow is longest when the light source is at a

    A. low angle

    B. 90 degree angle

    C. high angle directly above

    D. very close distance

    (1 mark)

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  31. Question 31

    1 mark

    When Wanjiru looks into a plane mirror she sees an image of herself. This image is formed because of:

    A. Splitting of light

    B. Bending of sound

    C. Reflection of light

    D. Blocking of light

    (1 mark)

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  32. Question 32

    1 mark

    Which part of the eye allows light to enter into the eye?

    A. The pupil

    B. The eyebrow

    C. The eyelash

    D. The ear drum

    (1 mark)

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  33. Question 33

    1 mark

    A material that allows only some light to pass through so that objects behind it appear blurred is said to be:

    A. Transparent

    B. Luminous

    C. Opaque

    D. Translucent

    (1 mark)

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  34. Question 34

    2 marks

    The moon shines brightly at night, yet it is described as a non-luminous object. Explain why the moon is said to be non-luminous even though we see it shining. (2 marks)

    (2 marks)

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  35. Question 35

    1 mark

    How many colours are seen in a rainbow?

    A. Three

    B. Seven

    C. Ten

    D. Five

    (1 mark)

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  36. Question 36

    1 mark

    After a rain shower the sun came out and Baraka saw a rainbow in the sky. A rainbow is formed when white light from the sun is:

    A. Absorbed by the clouds

    B. Turned into sound

    C. Blocked by an opaque object

    D. Split into different colours

    (1 mark)

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  37. Question 37

    1 mark

    A shadow is formed when:

    A. Light passes through clear glass

    B. Water flows over a surface

    C. An opaque object blocks light

    D. Light is switched off completely

    (1 mark)

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