A diode valve can be used as a rectifier.
A triode valve can be used as a rectifier.
A triode valve can be used as an amplifier.
Explanation:
A diode valve and a triode valve allow current to flow only in one direction. Since a rectifier is a device that converts alternating current (bi-directional) into direct current (uni-directional), a diode valve and a triode valve can be used as rectifiers. A triode valve can control its output in proportion to the input signal. That is, it can act as an amplifier, whereas a diode valve cannot control its output in proportion to the input signal. So, it cannot be use as an amplifier.
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When the N-pole of a bar magnet points towards the south and S-pole towards the north, the null points are at the
| (a) Magnetic axis |
(b) Magnetic centre |
| (c) Perpendicular divider of magnetic axis | (d) N and S poles |
Two rails of a railway track insulated from each other and the ground are connected to a milli voltmeter. What is the reading of voltmeter, when a train travels with a speed of 180 km/hr along the track. Given that the vertical component of earth's magnetic field is 0.2 
and the rails are separated by 1 metre
|
(a) |
(b) |
(c) |
(d) 1 volt |
If the atom 
follows the Bohr model and the radius of is n times the Bohr radius, then find n
|
(a) 100 |
(b) 200 |
(c) 4 |
(d) |
The lead wires should have
|
(a) Larger diameter and low resistance |
|
(b) Smaller diameter and high resistance |
|
(c) Smaller diameter and low resistance |
|
(d) Larger diameter and high resistance |
The relation between dynamic plate resistance (rp) of a vacuum diode and plate current in the space charge limited region, is
|
(a) |
(b) |
(c) |
(d) |
The device that does not work on the principle of mutual induction is
|
(a) Induction coil |
(b) Motor |
(c) Tesla coil |
(d) Transformer |
Assertion : The electric bulbs glows immediately when switch is on.
Reason : The drift velocity of electrons in a metallic wire is very high.
|
(a) If both assertion and reason are true and the reason is the correct explanation of the assertion. |
|
(b) If both assertion and reason are true but reason is not the correct explanation of the assertion. |
|
(c) If assertion is true but reason is false. |
|
(d) If the assertion and reason both are false. |
