A cylindrical conductor has uniform cross-section. Resistivity of its material increase linearly from left end to right end. If a constant current is flowing through it and at a section distance x from left end, magnitude of electric field intensity is E, which of the following graphs is correct
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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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Assuming that universe is expanding, if the spectrum of light coming from a star which is going away from earth is tested, then in the wavelength of light
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(a) There will be no change |
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(b) The spectrum will move to infrared region |
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(c) The spectrum will seems to shift to ultraviolet side |
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(d) None of the above |
In an interference experiment, third bright fringe is obtained at a point on the screen with a light of 700 nm. What should be the wavelength of the light source in order to obtain 5th bright fringe at the same point
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(a) 500 nm |
(b) 630 nm |
(c) 750 nm |
(d) 420 nm |
Faraday's laws are consequence of conservation of
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(a) Energy |
(b) Energy and magnetic field |
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(c) Charge |
(d) Magnetic field |
In a hydrogen atom, an electron moves in a circular orbit of radius 5.2 
and produces a magnetic induction of 12.56 T at its nucleus. The current produced by the motion of the electron will be (Given 
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(a) 6.53 |
(b) 13.25 |
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(c) 9.6 |
(d) 1.04 |
The energy band diagrams for three semiconductor samples of silicon are as shown. We can then assert that
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(a) Sample X is undoped while samples Y and Z have been doped with a third group and a fifth group impurity respectively |
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(b) Sample X is undoped while both samples Y and Z have been doped with a fifth group impurity |
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(c) Sample X has been doped with equal amounts of third and fifth group impurities while samples Y and Z are undoped |
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(d) Sample X is undoped while samples Y and Z have been doped with a fifth group and a third group impurity respectively |
In the following star circuit diagram (figure), the equivalent resistance between the points A and H will be
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(a) 1.944 r |
(b) 0.973 r |
(c) 0.486 r |
(d) 0.243 r |
The shift by which object appears to be raised ....... with the increase in the thickness of the denser medium.
