Explanation:
In a photodiode, photocurrent is directly proportional to intensiy of incident light. More the incident light intensity, more will be the current produced.
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According to corpuscular theory of light, the different colours of light are due to
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(a) Different electromagnetic waves |
|
(b) Different force of attraction among the corpuscles |
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(c) Different size of the corpuscles |
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(d) None of the above |
While doing his experiment, Millikan one day observed the following charges on a single drop
(i) 6.563 
(ii) 8.204 
(iii) 11.50 (iv) 13.13 
(v) 16.48 (vi) 18.09
From this data the value of the elementary charge (e) was found to be
|
(a) 1.641 |
(b) 1.630 |
(c) 1.648 |
(d) 1.602 |
A lens of power +2 diopters is placed in contact with a lens of power – 1 diopter. The combination will behave like
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(a) A convergent lens of focal length 50 cm |
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(b) A divergent lens of focal length 100 cm |
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(c) A convergent lens of focal length 100 cm |
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(d) A convergent lens of focal length 200 cm |
A rectangular coil of 300 turns has an average area of average area of 25 cm × 10 cm. The coil rotates with a speed of 50 cps in a uniform magnetic field of strength 4 
about an axis perpendicular of the field. The peak value of the induced e.m.f. is (in volt)
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(a) 3000 π |
(b) 300 π |
(c) 30 π |
(d) 3 π |
Positive rays consists of
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(a) Electrons |
(b) Neutrons |
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(c) Positive ions |
(d) Electro magnetic waves |
If the decay or disintegration constant of a radioactive substance is λ, then its half life and mean life are respectively
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(a) |
(b) |
(c) |
(d) |
