MCQ
Anti-nodal curves represent the points joining:
- ADestructive interference
- BConstructive interference
- CEqual pressure curves
- DZero pressure curves
Explanation:
Conceptual, anti node represents joining of all points in constructive interface as the amplitude is high.
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The human eye has a lens which has a
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(a) Soft portion at its centre |
(b) Hard surface |
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(c) Varying refractive index |
(d) Constant refractive index |
Between the primary and secondary rainbows, there is a dark band known as Alexandar’s dark band. This is because:
According to Einstein’s photoelectric equation, the plot of the kinetic energy of the emitted photo electrons from a metal versus the frequency, of the incident radiation gives a straight line whose slope
|
(a) Is the same for all metals and independent of the intensity of the radiation |
|
(b) Depends on the intensity of the radiation |
|
(c) Depends both on the intensity of the radiation and the metal used |
|
(d) Depends on the nature of the metals used |
A diminished image of an object is to be obtained on a screen 1.0 m from it. This can be achieved by appropriately placing
|
(a) A convex mirror of suitable focal length |
|
(b) A concave mirror of suitable focal length |
|
(c) A concave lens of suitable focal length |
|
(d) A convex lens of suitable focal length less than 0.25 m |
Doping of intrinsic semiconductor is done
|
(a) To neutralize charge carriers |
|
(b) To increase the concentration of majority charge carriers |
|
(c) To make it neutral before disposal |
|
(d) To carry out further purification |