- Araises the potential barrier.
- Breduces the majority carrier current to zero.
- ✓lowers the potential barrier.
- DNone of the above.
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Two electric lamps of 40 watt each are connected in parallel. The power consumed by the combination will be
|
(a) 20 watt |
(b) 60 watt
|
(c) 80 watt |
(d) 100 watt |
The point representing the cut off grid voltage on the mutual characteristic of triode is
| (a) S | (b) R |
(c) O |
(d) P |
In the diagram shown, the reading of voltmeter is 20 V and that of ammeter is 4 A. The value of R should be (Consider given ammeter and voltmeter are not ideal)
|
(a) Equal to 5Ω |
|
(b) Greater from 5 Ω |
|
(c) Less than 5 Ω |
|
(d) Greater or less than 5 Ω depends on the material of R |
A nucleus of
originally at rest emits a particle with speed v. What will be the recoil speed of the daughter nucleus
| (a) 4v/206 | (b) 4v/214 | (c) v/206 | (d) v/214 |
Two lenses of power +12 and – 2 diopters are placed in contact. What will the focal length of combination
|
(a) 10 cm |
(b) 12.5 cm |
(c) 16.6 cm |
(d) 8.33 cm |
The critical angle between an equilateral prism and air is 45°. If the incident ray is perpendicular to the refracting surface, then
|
(a) After deviation it will emerge from the second refracting surface |
|
(b) It is totally reflected on the second surface and emerges out perpendicularly from third surface in air |
|
(c) It is totally reflected from the second and third refracting surfaces and finally emerges out from the first surface |
|
(d) It is totally reflected from all the three sides of prism and never emerges out |
Diamagnetic substances are
|
(a) Feebly attracted by magnets |
(b) Strongly attracted by magnets |
|
(c) Feebly repelled by magnets |
(d) Strongly repelled by magnets |