When the angle of incidence on a material is 60°, the reflected light is completely polarized. The velocity of the refracted ray inside the material is (in ms–1)
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(a) 3 |
(b) |
(c) |
(d) 0.5 |
(c) 
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Assertion : Only a change in magnetic flux will maintain an induced current the coil.
Reason : The presence of large magnetic flux through a coil maintains a current in the coil if the circuit is continuous.
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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. |
Assertion : An ac generator is based on the phenomenon of self-induction.
Reason : In single coil, we consider self-induction only.
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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 assertion is false but reason is true. |
Unit of radioactivity is Rutherford. Its value is
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(a) 3.7 |
(b) 3.7 |
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(c) 1.0 |
(d) 1.0 |
If the separation between slits in Young’s double slit experiment is reduced to 
the fringe width becomes n times. The value of n is
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(a) 3 |
(b) |
(c) 9 |
(d) |
An LC resonant circuit contains a 400 pF capacitor and a 100 mH inductor. It is set into oscillation coupled to an antenna. The wavelength of the radiated electromagnetic waves is
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(a) 377 mm |
(b) 377 metre |
(c) 377 cm |
(d) 3.77 cm |
1000 small water drops each of radius r and charge q coalesce together to form one spherical drop. The potential of the big drop is larger than that of the smaller drop by a factor of
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(a) 1000 |
(b) 100 |
(c) 10 |
(d) 1 |
| C-1 (waves) | C-II (Production) |
| (1) Infra-red | P. Rapid vibration of electrons in aerials |
| (2) Radio | Q. Electrons in atoms emit light when they move from higher to lower energy level. |
| (3) Light | R. Klystron valve |
| (4) Microwave | S. Vibration of atoms and molecules |
