For television broadcasting the frequency employed is normally
1). 30 ? 300 MHz
2). 30 ? 300 GHz
3). 30 ? 300 kHz?
4). 30 ? 300 Hz?
1. Rocket works on the principle of
3. Sound travels at the fastest speed in
4. Which of the following is indicated by the colour of a star ?
5. A gradual increase in loudness is known as
6. Bending of light rays in denser medium is termed as:
8. The function of ball bearings in a wheel is :
9. The massive hole in the ozne layer over the Antharctica was first discovered in