An oil drop spreads over water because
1). oil Is lighter than water
2). oil is more viscous
3). oil does not mix with water
4). surface tension of oil is much smaller than that of water
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3. The period of revolution of a geo stationary satellite is
4. The strongest force in nature is
5. Which of the following are used for accurately measuring very small time intervals ?
6. Transboundary pollution (or) Acid rain?is caused by:
7. In a refrigerator, the cooling system should always be
8. The boiling point of water decreases at higher altitudes is due to