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Grade 4 Science Revision semester 2

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  • Name 3 artificial sources of light
    candle, tv screen, phone screen, lightbulb and etc.
  • what is translucent?
    light can partially go through
  • Name 3 high pitched sounds
    appropriate answer
  • does black skirt reflect or absorb light?
    absorb
  • does metal spoon reflect or absorb light?
    reflect
  • dirty water in the pond is a) transparent b) translucent c) opaque
    opaque
  • Name 3 low pitched sounds
    appropriate answer
  • True or False: paper sheet is an opaque material
    false
  • does white coat reflect or absorb light?
    reflect
  • How is a shadow created?
    opaque objects block the light
  • Frequency describes
    how many waves per second sound makes
  • True or False: The Moon is a source of light
    false
  • Give 3 examples of high pitch sounds
    whistle, doorbell, phone ringing etc.
  • does mirror reflect or absorb light?
    reflect
  • does wall reflect or absorb light?
    absorb
  • Why do cat's eyes look bright?
    they reflect light
  • Is it artificial or natural source of light: lightning
    natural
  • True or False: if a sound is high pitched it must be quiet
    false
  • what is opaque?
    light can not go through
  • Name 3 natural sources of light
    lightning, firefly, the Sun, fire etc
  • what is pitch and amplitude of a phone ring? Why?
    high pitched, quiet. So that people in the room could hear but not disturbing others
  • what is transparent?
    light can go through
  • What light source does not produce heat?
    appropriate answer
  • True or False: there are 3 tiny boned inside the ear
    true
  • True or False: Sound is a straight line
    false
  • Give 3 examples of low pitch sounds
    dog barking, cat purring, brushing teeth etc
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