Class VIII

Speed of light in a vacuum is
  1. 300000000m/s
  2. 400000000m/s
  3. 600000000m/s
  4. 900000000m/s
In swimming pools they appear shallower than they are actual because of
  1. reflection
  2. refraction
  3. both a and b
  4. none
Darker region in shadow with well-defined outline is called
  1. umbra
  2. penumbra
  3. screen
  4. source
A spinning of rainbow colors disc will produce
  1. multi shape spin
  2. white light
  3. dispersed light
  4. red light
Diamond is a
  1. transparent
  2. translucent
  3. opaque
  4. semi-absorbent
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