- AThe work function of the metal.
- BIntensity of incident radiation.
- CThe saturation current for the given frequency.
- DThe kinetic energy gained by the photoelectrons.
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Assertion : Neutrons penetrate matter more readily as compared to protons.
Reason : Neutrons are slightly more massive than protons.
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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. |
A particle A has charge +q and a particle B has charge +4q with each of them having the same mass m. When allowed to fall from rest through the same electric potential difference, the ratio of their speed will become
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(a) 2 : 1 |
(b) 1 : 2 |
(c) 1 : 4 |
(d) 4 : 1 |
The velocity of light emitted by a source S observed by an observer O, who is at rest with respect to S is c. If the observer moves towards S with velocity v, the velocity of light as observed will be
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(a) c + v |
(b) c - v |
(c) c |
(d) |
In the given figure the capacitors have a capacitance 4mF each if the capacitor
has a capacitance 10mF, then effective capacitance between A and B will be
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(a) 2mF |
(b) 4mF |
(c) 6mF |
(d) 8mF |
When one of the slits of Young’s experiment is covered with a transparent sheet of thickness 4.8 mm, the central fringe shifts to a position originally occupied by the 30th bright fringe. What should be the thickness of the sheet if the central fringe has to shift to the position occupied by 20th bright fringe
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(a) 3.8 mm |
(b) 1.6 mm |
(c) 7.6 mm |
(d) 3.2 mm |
For a triode m = 64 and gm =1600 m mho. It is used as an amplifier and an input signal of 1V (rms) is applied. The signal power in the load of 40 kW will be
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(a) 23.5 mW |
(b) 48.7 mW |
(c) 25.6 mW |
(d) None of these |
A diminished virtual image can be formed only in
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(a) Plane mirror |
(b) A concave mirror |
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(c) A convex mirror |
(d) Concave-parabolic mirror |