Potential gradient is defined as
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(a) Fall of potential per unit length of the wire |
|
(b) Fall of potential per unit area of the wire |
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(b) Fall of potential per unit area of the wire |
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(d) Potential at any one end of the wire |
(a) Fall of potential per unit length of the wire
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The amplification factor of a triode is 20 and trans-conductance is 3 milli mho and load resistance 3 
then the voltage gain is
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(a) 16.36 |
(b) 28 |
(c) 78 |
(d) 108 |
The current flowing through a coil of resistance 900 ohms is to be reduced by 90%. What value of shunt should be connected across the coil
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(a) 90 Ω |
(b) 100 Ω |
(c) 9 Ω |
(d) 10 Ω |
A new flashlight cell of e.m.f. 1.5 volts gives a current of 15 amps, when connected directly to an ammeter of resistance 0.04Ω. The internal resistance of cell is
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(a) 0.04 Ω |
(b) 0.06 Ω |
(c) 0.10 Ω |
(d) 10 Ω |
Molybdenum is used as a target element for production of X-rays because it is
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(a) A heavy element and can easily absorb high velocity electrons |
| (b) A heavy element with a high melting point |
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(c) An element having high thermal conductivity |
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(d) Heavy and can easily deflect electrons |
Zener breakdown takes place if
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(a) Doped impurity is low |
(b) Doped impurity is high |
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(c) Less impurity in N-part |
(d) Less impurity in P-type |