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A conducting loop carrying a current I is placed in a uniform magnetic field pointing into the plane of the paper as shown. The loop will have a tendency to
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(a) Contract |
(b) Expand |
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(c) Move towards +ve x –axis |
(d) Move towards –ve x-axis |
In Young’s double-slit experiment, an interference pattern is obtained on a screen by a light of wavelength 6000 Å, coming from the coherent sources S1 and S2. At certain point P on the screen third dark fringe is formed. Then the path difference S1P – S2P in microns is
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(a) 0.75 |
(b) 1.5 |
(c) 3.0 |
(d) 4.5 |
When a bar magnet falls through a long hollow metal cylinder fixed with its axis vertical, the final acceleration of the magnet is
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(a) Equal to zero |
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(b) Less than g |
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(c) Equal to g |
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(d) Equal to g in to beginning and then more than g |
Assertion : Radioactive nuclei emit 
particles.
Reason : Electrons exist inside the nucleus.
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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. |
The phenomenon of radioactivity is
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(a) Exothermic change which increases or decreases with temperature |
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(b) Increases on applied pressure |
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(c) Nuclear process does not depend on external factors |
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(d) None of the above |
Two plane mirrors are at right angles to each other. A man stands between them and combs his hair with his right hand. In how many of the images will he be seen using his right hand
| (a) None | (b) 1 | (c) 2 | (d) 3 |