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The two ends of a uniform conductor are joined to a cell of e.m.f. E and some internal resistance. Starting from the midpoint P of the conductor, we move in the direction of current and return to P. The potential V at every point on the path is plotted against the distance covered (x). Which of the following graphs best represents the resulting curve
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(a)
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(b)
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(c)
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(d)
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Which one of the following is true in photoelectric emission
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(a) Photoelectric current is directly proportional to the amplitude of light of a given frequency |
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(b) Photoelectric current is directly proportional to the intensity of light of a given frequency at moderate intensities |
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(c) Above the threshold frequency, the maximum K.E. of photoelectrons is inversely proportional to the frequency of incident light |
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(d) The threshold frequency depends upon the wavelength of incident light |
A beam of light AO is incident on a glass slab (μ = 1.54) in a direction as shown in figure. The reflected ray OB is passed through a Nicol prism on viewing through a Nicole prism, we find on rotating the prism that
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(a) The intensity is reduced down to zero and remains zero |
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(b) The intensity reduces down some what and rises again |
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(c) There is no change in intensity |
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(d) The intensity gradually reduces to zero and then again increases |
A uniform wire of resistance R is uniformly compressed along its length, until its radius becomes n times the original radius. Now resistance of the wire becomes
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(a) |
(b) |
(c) |
(d) nR |
Two charges each equal to 2μC are 0.5m apart. If both of them exist inside vacuum, then the force between them is
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(a) 1.89 N |
(b) 2.44 N |
(c) 0.144 N |
(d) 3.144 N |
The number of turns in the primary coil of a transformer is 200 and the number of turns in the secondary coil is 10. If 240 volt AC is applied to the primary, the output from the secondary will be
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(a) 48 V |
(b) 24 V |
(c) 12 V |
(d) 6 V |
An air capacitor of capacity C = 10μF is connected to a constant voltage battery of 12 V. Now the space between the plates is filled with a liquid of dielectric constant 5. The charge that flows now from battery to the capacitor is
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(a) 120 μC |
(b) 699 μC |
(c) 480 μC |
(d) 24 μC |
