Explanation:
There is no potential gradient along any direction parallel to the surface, and no electric field is parallel with the surface, This means electric field are always at right angle to the equipotential surface.
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The average life T and the decay constant λ of a radioactive nucleus are related as
|
(a) T λ = 1 |
(b) T = |
(c) |
(d) T = |
The average number of prompt neutrons produced per fission of 
is
|
(a) More than 5 |
(b) 3 to 5 |
(c) 2 to 3 |
(d) 1 to 2 |
A narrow beam of white light goes through a slab having parallel faces.
A transformer with efficiency 80% works at 4 kW and 100 V. If the secondary voltage is 200 V, then the primary and secondary currents are respectively
|
(a) 40 A, 16 A |
(b) 16 A, 40 A |
(c) 20 A, 40 A |
(d) 40 A, 20 A |
Assertion : The possibility of an electric bulb fusing is higher at the time of switching ON and OFF
Reason : Inductive effects produce a surge at the time of switch ON and OFF
|
(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. |
The stopping potential (
|
(a) Depends upon the angle of incident light |
|
(b) Depends upon the intensity of incident light |
|
(c) Depends upon the surface nature of the substance |
|
(d) Is independent of the intensity of the incident light |
The process of superimposing signal frequency (i.e. audio wave) on the carrier wave is known as
|
(a) Transmission |
(b) Reception |
(c) Modulation |
(d) Detection |
