Explanation:
In the normal operation of a transistor, the base−emitter junction is forward biassed and the base−collector junction is reverse biassed. This is done so that the conduction of majority carriers can take place across the emitter−base junction and the free electrons can reach the collector to give the output current.
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The temperature coefficient of resistance for a wire is 0.00125/℃. At 300K its resistance is 1 ohm. The temperature at which the resistance becomes 2 ohm is
|
(a) 1154 K |
(b) 1100 K |
(c) 1400 K |
(d) 1127 K |
The ammeter A reads 2 A and the voltmeter V reads 20 V. the value of resistance R is (Assuming finite resistance's of ammeter and voltmeter)
|
(a) Exactly 10 ohm |
(b) Less than 10 ohm |
|
(c) More than 10 ohm |
(d) We cannot definitely say |
In a current carrying long solenoid, the field produced does not depend upon
|
(a) Number of turns per unit length |
(b) Current flowing |
|
(c) Radius of the solenoid |
(d) All of the above three |
The terminal potential difference of a cell when short-circuited is (E = E.M.F. of the cell)
|
(a) E |
(b) E/2 |
(c) Zero |
(d) E/3 |
An antenna is a device
|
(a) That converts electromagnetic energy into radio frequency signal |
|
(b) That converts radio frequency signal into electromagnetic energy |
|
(c) That converts guided electromagnetic waves into free space electromagnetic waves and vice-versa |
|
(d) None of these |
An alpha particle is accelerated through a potential difference of 
. Its kinetic energy will be
|
(a) 1 MeV |
(b) 2 MeV |
(c) 4 MeV |
(d) 8 MeV |