- AElectromagnetic radiations.
- BThe electrons orbiting around the nucleus.
- CCharged particles emitted by nucleus.
- DNeutral particles.
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To make a PN junction conducting
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(a) The value of forward bias should be more than the barrier potential |
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(b) The value of forward bias should be less than the barrier potential |
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(c) The value of reverse bias should be more than the barrier potential |
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(d) The value of reverse bias should be less than the barrier potential |
Audio signal cannot be transmitted because
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(a) The signal has more noise |
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(b) The signal cannot be amplified for distance communication |
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(c) The transmitting antenna length is very small to design |
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(d) The transmitting antenna length is very large and impracticable |
The resistances of a wire at temperatures t℃ and 0℃ are related by
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(a) |
(b) |
(c) |
(d) |
In nuclear fission, the fission reactions proceeds with a projectile. Which of the following suits the best
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(a) Slow proton |
(b) Fast neutron |
(c) Slow neutron |
(d) None of these |
Light is an electromagnetic wave. Its speed in vacuum is given by the expression
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(a) |
(b) |
(c) |
(d) |
A person cannot see distinctly at the distance less than one metre. Calculate the power of the lens that he should use to read a book at a distance of 25 cm
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(a) + 3.0 D |
(b) + 0.125 D |
(c) – 3.0 D |
(d) + 4.0 D |
To convert a 800 mV range milli voltmeter of resistance 40 W into a galvanometer of 100 mA range, the resistance to be connected as shunt is
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(a) 10 W |
(b) 20 W |
(c) 30 W |
(d) 40 W |