- ✓$\mu \gg 1$
- B$\mu=1$
- C$\mu<1$
- D$\mu=0$
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If rotational velocity of a dynamo armature is doubled, then induced e.m.f. will become
|
(a) Half |
(b) Two times |
(c) Four times |
(d) Unchanged |
A step up transformer has transformation ration 5 : 3. What is voltage in secondary if voltage in primary is 60 V
|
(a) 20 V |
(b) 60 V |
(c) 100 V |
(d) 180 V |
The relaxation time in conductors
|
(a) Increases with the increase of temperature |
|
(b) Decreases with the increase of temperature |
|
(c) It does not depend on temperature |
|
(d) All of sudden changes at 400 K |
In a moving coil galvanometer, the deflection of the coil θ is related to the electrical current i by the relation
|
(a) i ∝ tanθ |
(b) i ∝ θ |
(c) i ∝ |
(d) i ∝ |
The length of Milky way is
|
(a) 100,000 light years |
(b) 10,000 light years |
(c) 1000 light years |
(d) 100 light years |
A radioactive sample of U238 decay to Pb through a process for which half life is 4.5 × 109 years. The ratio of number of nuclei of Pb to U238 after a time of 1.5 × 109 years (given 21/3 = 1.26)
|
(a) 0.12 |
(b) 0.26 |
(c) 1.2 |
(d) 0.37 |
Assertion : Gauss theorem is not applicable in magnetism.
Reason : Mono magnetic pole does not exist.
|
(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. |