The sky appears blue because
1). all colours interfere to produce blue
2). in white light the blue component dominates
3). the atmosphere scatters blue colour more than the others
4). it is actually blue
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1. If objects appear enlarged and inverted in a rear view mirror, then which type of mirror is used?
3. A photostat machine works on
4. Which of the following uses a Non Renewable Energy Source?
6. Which conservation principle is applicable in the case of the motion of a rocket?
7. The device which convert AC to DC is :
8. Optical fibre works on which of the following principle of light?
9. The average kinetic energy of the molecules of an ideal gas is directly proportional to