Explanation:
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Three capacitors of capacitance 1 mF, 2 mF and 3 mF are connected in series and a potential difference of 11 V is applied across the combination. Then, the potential difference across the plates of 1 mF capacitor is
|
(a) 2 V |
(b) 4 V |
(c) 1 V |
(d) 6 V |
A transistor is used as an amplifier in CB mode with a load resistance of 5 k W the current gain of amplifier is 0.98 and the input resistance is 70 W, the voltage gain and power gain respectively are
|
(a) 70, 68.6 |
(b) 80, 75.6 |
(c) 60, 66.6 |
(d) 90, 96.6 |
In a P-type semiconductor, germanium is doped with
|
(a) Boron |
(b) Gallium |
(c) Aluminium |
(d) All of these |
The amount of heat produced in a resistor when a current is passed through it can be found using
|
(a) Faraday’s Law |
(b) Kirchhoff’s Law |
(c) Laplace’s Law |
(d) Joule’s Law |
The explosion of the atomic bomb takes place due to
|
(a) Nuclear fission |
(b) Nuclear fusion |
|
(c) Scattering |
(d) Thermionic emission |
Photoelectric effect was successfully explained first by
|
(a) Planck |
(b) Hallwash |
(c) Hertz |
(d) Einstein |
Armature current in dc motor will be maximum when
|
(a) Motor has acquired maximum speed |
(b) Motor has acquired intermediate speed |
|
(c) Motor has just started moving |
(d) Motor is switched off |
An electric heater of resistance 6 ohm is run for 10 minutes on a 120 volt line. The energy liberated in this period of time is
|
(a) 7.2 |
(b) 14.4 |
(c) 43.2 |
(d) 28.8 |
