- Atype of metal.
- Btype of metal surface.
- Ctype of metal surface and surface area.
- ✓type of metal and type of metal surface.
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According to Gauss’ Theorem, electric field of an infinitely long straight wire is proportional to
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(a) r |
(b) |
(c) |
(d) |
The observed wavelength of light coming from a distant galaxy is found to be increased by 0.5% as compared with that coming from a terrestrial source. The galaxy is
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(a) Stationary with respect to the earth |
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(b) Approaching the earth with velocity of light |
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(c) Receding from the earth with the velocity of light |
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(d) Receding from the earth with a velocity equal to 1.5 |
If an electron enters a magnetic field with its velocity pointing in the same direction as the magnetic field, then
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(a) The electron will turn to its right |
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(b) The electron will turn to its left |
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(c) The velocity of the electron will increase |
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(d) The velocity of the electron will remain unchanged |
Which of the following pairs is an isobar
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(a) |
(b) |
(c) |
(d) |
A caesium photocell, with a steady potential difference of 60V across, is illuminated by a bright point source of light 50 cm away. When the same light is placed 1m away the photoelectrons emitted from the cell
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(a) Are one quarter as numerous |
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(b) Are half as numerous |
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(c) Each carry one quarter of their previous momentum |
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(d) Each carry one quarter of their previous energy |
Assertion : A pulsor is a source of radio waves which change in terms of intensity at regular interval of time
Reason : A pulsor is a rotating neutron star
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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. |
A glass slab is placed in the path of beam of convergent light. The point of convergence of light:
In an experiment of meter bridge, a null point is obtained at the centre of the bridge wire. When a resistance of 10 ohm is connected in one gap, the value of resistance in other gap is
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(a) 10 Ω |
(b) 5 Ω |
(c) |
(d) 500 Ω |