When pressure is increased the melting point of ice
1). increases
2). does not change
3). decreases
4). depends on the impurities in the ice
2. The different colours of different stars are due to the variation of
3. Why do birds not have respiratory trouble at the time of flying at high altitude
4. What is the size of Electron as comapared to Proton and Neutron?
5. What is the unit of the physical quantity 'Magnetic field strength'?
6. When a steel ball is placed on the surface of mercury, it does not sink because
8. What is the name of the device used to convert alternating current into direct current ?