In general, metallic ropes are suspended on the carriers which take inflammable material. The reason is
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(a) There speed is controlled |
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(b) To keep the centre of gravity of the carrier nearer to the earth |
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(c) To keep the body of the carrier in contact with the earth |
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(d) Nothing should be placed under the carrier |
(c) To keep the body of the carrier in contact with the earth
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The graph Shows the variation in magnetic flux ∅(t) with time through a coil. Which of the statements given below is not correct
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(a) There is a change in the direction as well as magnitude of the induced emf between B and D |
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(b) The magnitude of the induced emf is maximum between B and C |
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(c)There is a change in the direction as well as magnitude of induced emf between A and C |
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(d) The induced emf is zero at B |
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 |
Photo cell is a device to
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(a) Store photons |
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(b) Measure light intensity |
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(c) Convert photon energy into mechanical energy |
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(d) Store electrical energy for replacing storage batteries |
Total internal reflection of light is possible when light enters from
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(a) Air to glass |
(b) Vacuum to air |
(c) Air to water |
(d) Water to air |
The radioactive nucleus 
decays to 
through the emission of
|
(a) Neutron |
(b) Proton |
(c) Electron |
(d) Positron |