Share Grade 4 Science Revision semester 2
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Is it artificial or natural source of light: lightning
natural
dirty water in the pond is a) transparent b) translucent c) opaque
opaque
What light source does not produce heat?
appropriate answer
Give 3 examples of high pitch sounds
whistle, doorbell, phone ringing etc.
Give 3 examples of low pitch sounds
dog barking, cat purring, brushing teeth etc
Frequency describes
how many waves per second sound makes
True or False: Sound is a straight line
false
True or False: The Moon is a source of light
false
True or False: paper sheet is an opaque material
false
True or False: if a sound is high pitched it must be quiet
false
True or False: there are 3 tiny boned inside the ear
true
what is translucent?
light can partially go through
what is transparent?
light can go through
what is opaque?
light can not go through
does black skirt reflect or absorb light?
absorb
does white coat reflect or absorb light?
reflect
