- A10–10m.
- B10–6m.
- C10–15m.
- D10–14m.
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In a diffraction pattern by a wire, on increasing diameter of wire, fringe width
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(a) Decreases |
|
(b) Increases |
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(c) Remains unchanged |
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(d) Increasing or decreasing will depend on wavelength |
Two resistors whose value are in ratio 2 : 1 are connected in parallel with one cell. Then ratio of power dissipated is
|
(a) 2 : 1 |
(b) 4 : 1 |
(c) 1 : 2 |
(d) 1 : 1 |
If a lens is cut into two pieces perpendicular to the principal axis and only one part is used, the intensity of the image
|
(a) Remains same |
(b) |
(c) 2 times |
(d) Infinite |
A photocell stops emission if it is maintained at 2V negative potential. The energy of most energetic photoelectron is
|
(a) 2eV |
(b) 2J |
(c) 2kJ |
(d) 2keV |

Assertion : A person touching a high power line gets stuck with the line.
Reason : The current carrying wires attract the man towards it.
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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 length of the wire is doubled. Its conductance will be
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(a) Unchanged |
(b) Halved |
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(c) Quadrupled |
(d) 1/4 of the original value |