The wire of flash bulb is made of:
1). Copper
2). Barium
3). Magnesium
4). Silver
1. The natural resource known as black gold is
2. Which of the following fibres catches fire least ?
4. The acid rain destroys vegetations because it contains
5. Potassium Permanganate is used for purifying drinking water, because________
7. The long range potential of nu I clear energy in India depends on i its reserves of
10. Ozone layer in the upper parts of the atmosphere serves as a protective shield against harmful