If two light waves having same frequency have intensity ratio 4 : 1 and they interfere, the ratio of maximum to minimum intensity in the pattern will be
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(a) 9 : 1 |
(b) 3 : 1 |
(c) 25 : 9 |
(d) 16 : 25 |
(a) 9 : 1
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If a wire of length 1 meter placed in uniform magnetic field 1.5 Tesla at angle 30° with magnetic field. The current in a wire 10 amp. Then force on a wire will be
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(a) 7.5 N |
(b) 1.5 N |
(c) 0.5 N |
(d) 2.5 N |
In a triode valve the amplification factor is 20 and mutual conductance is 10–3 mho. The plate resistance is
|
(a) 2 × 103 W |
(b) 4 × 103 W |
(c) 2 ×104 W |
(d) 2 ×104 W |
Resistivity of a semiconductor depends on
|
(a) Shape of semiconductor |
|
(b) Atomic nature of semiconductor |
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(c) Length of semiconductor |
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(d) Shape and atomic nature of semiconductor |
When neutrons are bombarded on nucleus of 
, the number of emitted neutrons will be
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(a) 1 |
(b) 2 |
(c) 3 |
(d) 4 |
Assertion : The temperature coefficient of resistance is positive for metals and negative for P-type semiconductor.
Reason : The effective charge carriers in metals are negatively charged whereas in P-type semiconductor they are positively charged.
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(a) If both assertion and reason are true and the reason is the correct explanation of the assertion. |
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(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. |