Cryogenics is a science dealing with
1). high temperatures
2). low temperatures
3). friction and wear
4). growth of crystals
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1. The least penetrating power ray is
2. Water cannot be used to extinguish fire caused by electric current because
3. Hydraulic brakes work on the principle of
5. The splitting of different colours of light in a prism is :
7. Perspiration cools the body because?
8. Heat from the sun reaches earth by the process of
9. Temperature of distant luminous bodies can be determined by