The curves (a), (b) (c) and (d) show the variation between the applied potential difference (V) and the photoelectric current (i), at two different intensities of light (I1 > I2). In which figure is the correct variation shown
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(a)
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(b)
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(c)
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(d)
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(b)
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Nuclear forces are
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(a) Short ranged attractive and charge independent |
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(b) Short ranged attractive and charge dependent |
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(c) Long ranged repulsive and charge independent |
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(d) Long ranged repulsive and charge dependent |
Focal length of a convex lens will be maximum for
|
(a) Blue light |
(b) Yellow light |
(c) Green light |
(d) Red light |
Vibration magnetometer before use, should be set
| (a) In magnetic meridian | (b) In geographical meridian |
| (c) Perpendicular to magnetic meridian | (d) In any position |
Assertion : If the temperature of a semiconductor is increased then it's resistance decreases.
Reason : The energy gap between conduction band and valence band is very small
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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. |
Two equal point charges are fixed at x = -a and x = +a on the x-axis. Another point charge Q is placed at the origin. The Change in the electrical potential energy of Q, when it is displaced by a small distance x along the x-axis, is approximately proportional to
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(a) x |
(b) |
(c) |
(d) 1/x |
