The least penetrating power ray is
1). $alpha$ Ray
2). ?X ? Ray?
3). $gamma$ Ray
4). $beta$ Ray
1. Conversion of heat into electrical is achieved by using :
2. The weight of a body acts through the centre of
4. Mercury is the _______ planet from the Sun.
5. A geostationary satellite should be launched such that it moves from:
7. When a ship enters the sea from a river
8. Why does ice covered in sawdust not melt quickly ?
9. If objects appear enlarged and inverted in a rear view mirror, then which type of mirror is used?
10. A gas thermometer is more sensitive than a liquid thermometer because a gas :