Light wave is travelling along y-direction. If the corresponding 
vector at any time is along the x-axis, the direction of 
vector at that time is along
|
(a) y-axis |
(b) x-axis |
(c) + z-axis |
(d) – z axis |
(d) – z axis
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For a given temperature difference, which of the following pairs will generate maximum thermo e.m.f.
|
(a) Antimony-bismuth |
(b) Silver-gold |
(c) Iron-copper |
(d) Lead-nickel |
Voltage in the secondary coil of a transformer does not depend upon.
|
(a) Voltage in the primary coil |
|
(b) Ratio of number of turns in the two coils |
|
(c) Frequency of the source |
|
(d) Both (a) and (b) |
Assertion : Reduction factor (K) of a tangent galvanometer helps in reducing deflection to current.
Reason : Reduction factor increases with increase of current.
|
(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. |
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(c) If assertion is true but reason is false. |
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(d) If the assertion and reason both are false. |
In a semiconductor, the concentration of electrons is 8 
and that of the holes is 5
The semiconductor is
|
(a) P-type |
(b) N-type |
(c) Intrinsic |
(d) PNP-type |