
- AFirst flows from A to B and then from B to A
- BFirst flows from B to A and then from A to B
- CAlways flows from B to A
- DAlways flows from A to B

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A gamma ray photon creates an electron- positron pair. If the rest mass energy of an electron is 0.5 MeV and the total K.E. of the electron- positron pair is 0.78 MeV, then the energy of the gamma ray photon must be
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(a) 0.78 MeV |
(b) 1.78 MeV |
(c) 1.28 MeV |
(d) 0.28 MeV |
The dimensions of magnetic flux are
|
(a) |
(b) |
(c) |
(d) |
Wave nature of light follows because
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(a) Light rays travel in a straight line |
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(b) Light exhibits the phenomena of reflection and refraction |
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(c) Light exhibits the phenomenon of interference |
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(d) Light causes the phenomenon of photoelectric effect |
The fine powder of a coloured glass is seen as
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(a) Coloured |
(b) White |
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(c) That of the glass colour |
(d) Black |
Which arrangement of four identical resistances should be used to draw maximum energy from a cell of voltage V
|
(a)
|
(b)
|
|
(c)
|
(d)
|