Weight of a person at a height of 2R from the centre of the earth, where R is the radius of the earth _______.
1). remains same
2). becomes half
3). becomes twice
4). becomes one-fourth
2. Which of the following liquids has the least density
3. Why does a fountain pen leak in aeroplane flying at a height?
4. Permissible noise level at Residential area during night time Is:
5. A 'Market Economy' is one which
6. Holography is a technique of
7. Ventilators are provided near the ceiling of the room because