- AUnder heavy frequency
- BUltra-high frequency
- CUltra heavy frequency
- DUnder high frequency
Explanation:
UHF stands for Ultra high frequency. Cellular phones used radio waves to transmit voice communication in the Ultra high-frequency Band. The UHF band extends from 900 MHz to 5 x 109 Hz or 5000 MHz. Radio waves are produced by oscillating circuits having an inductor and capacitor.
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Atomic radius of fcc is
|
(a) |
(b) |
(c) |
(d) |
The minimum deviation produced by a hollow prism filled with a certain liquid is found to be 30°. The light ray is also found to be refracted at angle of 30°. The refractive index of the liquid is
|
(a) |
(b) |
(c) |
(d) |
The PN junction diode is used as
| (a) An amplifier | (b) A rectifier | (c) An oscillator | (d) A modulator |
Thermionic emission from a heated filament varies with its temperature T as
|
(a) |
(b) T |
(c) |
(d) |
The true statement is
|
(a) The order of colours in the primary and the secondary rainbows is the same |
|
(b) The intensity of colours in the primary and the secondary rainbows is the same |
|
(c) The intensity of light in the primary rainbow is greater and the order of colours is the same than the secondary rainbow |
|
(d) The intensity of light for different colours in primary rainbow is greater and the order of colours is reverse than the secondary rainbow |