- AAs a rectifier.
- BFor converting light energy to electric energy.
- CFor getting light radiation.
- DFor increasing the amplitude of an AC signal
Explanation:
To increase the amplitude of an AC signal, transistors are used. p-n junction diodes can be used as rectifiers and in photo-diode and LED.
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The cold junction of a thermocouple is maintained at 10℃. No thermo e.m.f. is developed when the hot junction is maintained at 530 ℃ . The neutral temperature is
|
(a) 260℃ |
(b) 270℃ |
(c) 265℃ |
(d) 520℃ |
The neutral temperature of a thermocouple is 350℃ when the cold junction is at 0℃ When the cold junction is immersed in a bath of 30℃, the inversion temperature is
|
(a) 700℃ |
(b) 600℃ |
(c) 350℃ |
(d) 670℃ |
For a crystal system, a = b = c, a = b = g ¹ 90o, the system is
|
(a) Tetragonal system |
(b) Cubic system |
|
(c) Orthorhombic system |
(d) Rhombohedral system |
The ratio of intensities of two waves are given by 4 : 1. The ratio of the amplitudes of the two waves is
|
(a) 2 : 1 |
(b) 1 : 2 |
(c) 4 : 1 |
(d) 1 : 4 |
Earth's magnetic field always has a horizontal component except at or Horizontal component of earth's magnetic field remains zero at
| (a) Equator | (b) Magnetic poles | (c) A latitude of 60o | (d) An altitude of 60o |