- ✓Gamma rays
- BX-rays
- CRadio waves
- DMicro waves
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
A vibration magnetometer consists of two identical bar magnets placed one over the other such that they are perpendicular and bisect each other. The time period of oscillation in a horizontal magnetic field is
seconds. One of the magnets is removed and if the other magnet oscillates in the same field, then the time period in seconds is
|
(a) |
(b) |
(c) 2 |
(d) |
Finger prints on a piece of paper may be detected by sprinkling fluorescent powder on the paper and then looking it into
|
(a) Mercury light |
(b) Sunlight |
(c) Infrared light |
(d) Ultraviolet light |
Which is the correct relation for forbidden energy gap in conductor, semi conductor and insulator
|
(a) |
|
(b) |
|
(c) |
|
(d) |
The 21 cm radio wave emitted by hydrogen in interstellar space is due to the interaction called the hyperfine interaction is atomic hydrogen. the energy of the emitted wave is nearly
|
(a) |
(b) 1 Joule |
(c) 7 |
(d) |
Smaller pieces of heavy stones and metals which on entering earth's atmosphere burns out are
|
(a) Comets |
(b) Meteorites |
(c) Asteroids |
(d) All of these |