Consider the points lying on a straight line joining two fixed opposite charges. Between the charges there is
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(a) No point where electric field is zero |
|
(b) Only one point where potential is zero |
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(c) Only one point where electric field is zero |
|
(d) a, b |
(d) a, b
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A radioactive sample with a half life of 1 month has the label : “Activity=2 micro curies on 1.8.1991.'' What will be its activity two months later
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(a) 1.0 micro curies |
(b) 0.5 micro curies |
(c) 4 micro curies |
(d) 8 micro curies |
In the arrangement of resistances shown below, the effective resistance between points A and B is
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(a) 20 Ω |
(b) 30 Ω |
(c) 90 Ω |
(d) 110 Ω |
The example of nuclear fusion is
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(a) Formation of barium and krypton from uranium |
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(b) Formation of helium from hydrogen |
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(c) Formation of plutonium 235 from uranium 235 |
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(d) Formation of water from hydrogen and oxygen |
A charge q coulomb moves in a circle at n revolutions per second and the radius of the circle is r metre. Then magnetic field at the centre of the circle is
|
(a) |
(b) |
|
(c) |
(d) |
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 |
