- AAttacks.
- BRepels.
- CBoth a and b.
- DNone.
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Three capacitors of capacity are connected in series. Their total capacity will be
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(a) |
(b) 1/ |
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(c) ( |
(d) None of these |
A photon of 1.7
Joules is absorbed by a material under special circumstances. The correct statement is
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(a) Electrons of the atom of absorbed material will go the higher energy states |
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(b) Electron and positron pair will be created |
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(c) Only positron will be produced |
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(d) Photoelectric effect will occur and electron will be produced |
A coin kept in a container and not visible can be viewed by pouring water into the container. It happens because of the:
Assertion : The permeability of a ferromagnetic material is independent of the magnetic field.
Reason : Permeability of a material is a constant quantity.
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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. |
Two short magnets having magnetic moments in the ratio 27 : 8, when placed on opposite sides of a deflection magnetometer, produce no deflection. If the distance of the weaker magnet is 0.12 m from the centre of deflection magnetometer, the distance of the stronger magnet from the centre is
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(a) 0.06 m |
(b) 0.08 m |
(c) 0.12 m |
(d) 0.18 m |
Cathode rays are
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(a) Positive rays |
(b) Neutral rays |
(c) He rays |
(d) Electron waves |