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21.
The splitting of different colours of light in a prism is
- A.Reflection of light
- C.Diffraction of light
- B.Dispersion of light
- D.Refraction of light
- Answer
- Report
Answer : [D]
22.
Ball bearings are used in cycles, scooters, etc, to
- A.Reduce the friction between the wheel and the axle
- B.Increase the friction between the wheel and the axle
- C.Reduce the friction between ground and the wheel
- D.None of these
- Answer
- Report
Answer : [A]
23.
The working principle of a washing machine is
- A.diffusion
- C.dialysis
- B.reverse osmosis
- D.centrifugation
- Answer
- Report
Answer : [D]
24.
Electromagnetic theory was proposed by
- A.Newton
- C.Maxwell
- B.Huygens
- D.Max Planck
- Answer
- Report
Answer : [C]
25.
Ozone layer in the upper atmosphere is due to the reactions of
- A.carbon dioxide and layers of atmosphere
- C.oxygen and ultraviolet rays
- B.carbon dioxide and oxygen
- D.infra-red rays and ultraviolet rays
- Answer
- Report
Answer : [C]
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