- AE
- B3E
- C6E
- D9E
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The time period of rotation of the sun is 25 days and its radius is 7 . The Doppler shift for the light of wavelength 6000 Å emitted from the surface of the sun will be
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(a) 0.04 Å |
(b) 0.40 Å |
(c) 4.00 Å |
(d) 40.0 Å |
The dependence of binding energy per nucleon,
on the mass number, A, is represented by
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(a)
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(b)
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(C)
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(d)
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If the ratio of intensities of two waves is 1 : 25, then the ratio of their amplitudes will be
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(a) 1 : 25 |
(b) 5 : 1 |
(c) 26 : 24 |
(d) 1 : 5 |
Assertion : The threshold frequency of photoelectric effect supports the particle nature of sunlight.
Reason : If frequency of incident light is less than the threshold frequency, electrons are not emitted from metal surface.
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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. |
An object is placed at a distance of f/2 from a convex lens. The image will be
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(a) At one of the foci, virtual and double its size |
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(b) At 3f / 2, real and inverted |
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(c) At 2f, virtual and erect |
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(d) None of these |
According to Maxwell’s hypothesis, a changing electric field gives rise to
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(a) An e.m.f. |
(b) Electric current |
(c) Magnetic field |
(d) Pressure radiant |
The dispersive power is maximum for the material
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(a) Flint glass |
(b) Crown glass |
(c) Mixture of both |
(d) None of the above |

A capacitor with air as the dielectric is charged to a potential of 100 volts. If the space between the plates is now filled with a dielectric of dielectric constant 10, the potential difference between the plates will be
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(a) 1000 volts |
(b) 100 volts |
(c) 10 volts |
(d) Zero |
Effective resistance between A and B is
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(a) 15 W |
(b) 5 W |
(c) |
(d) 20 W |