MCQ
Induction occurs due to ______?
- AMovement of electron.
- BLeakage of charge.
- CIonization of atoms.
- DUniform charge distribution.
Explanation:
When a positive or negative charged body comes close to another body, the electrons of the second body redistribute themselves. Electrons of the second body are attracted by the positively charged body and repelled by the negatively charged body.
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When the number of turns in a coil is doubled without any change in the length of the coil, its self inductance becomes
|
(a) Four times |
(b) Doubled |
(c) Halved |
(d) Unchanged |
In Bohr model of the hydrogen atom, the lowest orbit corresponds to
|
(a) Infinite energy |
(b) The maximum energy |
|
(c) The minimum energy |
(d) Zero energy |
A charge of Q coulomb is placed on a solid piece of metal of irregular shape. The charge will distribute itself
|
(a) Uniformly in the metal object |
|
(b) Uniformly on the surface of the object |
|
(c) Such that the potential energy of the system is minimised |
|
(d) Such that the total heat loss is minimised |
A point object is placed at a distance of 30 cm from a convex mirror of focal length 30cm. The image will form at
|
(a) Infinity |
(b) Focus |
|
(c) Pole |
(d) 15 cm behind the mirror |
Which of the following is true
|
(a) Common base transistor is commonly used because current gain is maximum |
|
(b) Common emitter is commonly used because current gain is maximum |
|
(c) Common collector is commonly used because current gain is maximum |
|
(d) Common emitter is the least used transistor |
If two wires having resistance R and 2R. Both joined in series and in parallel then ratio of heat generated in this situation, applying the same voltage,
|
(a) 2 : 1 |
(b) 1 : 2 |
(c) 2 : 9 |
(d) 9 : 2 |