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When light of wavelength λ is incident on an equilateral prism kept in its minimum deviation position, it is found that the angle of deviation equals the angle of the prism itself. The refractive index of the material of the prism for the wavelength λ is, then
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(a) |
(b) |
(c) 2 |
(d) |
If in a nuclear fusion process the masses of the fusing nuclei be 
and 
and the mass of the resultant nucleus be 
, then
(a) 
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(b) 
|
(c) 
|
(d) 
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Function of rectifier is
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(a) To convert ac into dc |
(b) To convert dc into ac |
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(c) Both (a) and (b) |
(d) None of these |
Assertion : Interference pattern is made by using blue light instead of red light, the fringes becomes narrower.
Reason : In Young’s double slit experiment, fringe width is given by relation B = 
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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. |
When NPN transistor is used as an amplifier
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(a) Electrons move from base to collector |
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(b) Holes move from emitter to base |
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(c) Electrons move from collector to base |
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(d) Holes move from base to emitter |
Yellow light is used in single slit diffraction experiment with slit width 0.6 mm. If yellow light is replaced by X-rays then the pattern will reveal
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(a) That the central maxima is narrower |
(b) No diffraction pattern |
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(c) More number of fringes |
(d) Less number of fringes |
A proton enters a magnetic field of flux density 1.5 
with a velocity of 2 
at an angle of 30° with the field. The force on the proton will be
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(a) 2.4 |
(b) 0.24 |
(c) 24 |
(d) 0.024 |
