Find out the e.m.f. produced when the current changes from 0 to 1 A in 10 second, given L = 10 mH
|
(a) 1 V |
(b) 1 mV |
(c) 1 mV |
(d) 0.1 V |
Find out the e.m.f. produced when the current changes from 0 to 1 A in 10 second, given L = 10 mH
|
(a) 1 V |
(b) 1 mV |
(c) 1 mV |
(d) 0.1 V |
(b) 1 mV
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The output of a dynamo using a splitting commutator is
|
(a) dc |
(b) ac |
|
(c) Fluctuating dc |
(d) Half-wave rectified voltage |
Two condensers
and
in a circuit are joined as shown in figure. The potential of point A is
and that of B is
. The potential of point D will be

|
(a) |
(b) |
(c) |
(d) |
The graph gives the magnitude B(t) of a uniform magnetic field that exists throughout a conducting loop, perpendicular to the plane of the loop. Rank the five regions of the graph according to the magnitude of the emf induced in the loop, greatest first

|
(a) b > (d = e) < (a = c) |
(b) b > (d = e) > (a = c) |
|
(c) b < d < e < c < a |
(d) b > (a = c) > (d = e) |
In the following reaction the value of ‘X’ is ![]()
|
(a) |
(b) |
(c) |
(d) |
The alloys constantan and manganin are used to make standard resistance due to they have
|
(a) Low resistivity |
(b) High resistivity |
|
(c) Low temperature coefficient of resistance |
(d) Both (b) and (c) |
Which of the following is not a mode of radioactive decay
|
(a) Positron emission |
(b) Electron capture |
(c) Fusion |
(d) Alpha decay |
Assertion : Cyclotron is a device which is used to accelerate the positive ion.
Reason : Cyclotron frequency depends upon the velocity.
|
(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. |
