Two protons exerts a nuclear force on each other, the distance between them is
|
(a) |
(b) |
(c) |
(d) |
Two protons exerts a nuclear force on each other, the distance between them is
|
(a) |
(b) |
(c) |
(d) |
(a)
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A potential barrier of 0.50 V exists across a P-N junction. If the depletion region is 5.0
m wide, the intensity of the electric field in this region is
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(a) 1.0 |
(b) 1.0 |
(c) 2.0 |
(d) 2.0 |
The figure shows a circuit diagram of a ‘Wheatstone Bridge’ to measure the resistance G of the galvanometer. The relation will be satisfied only when
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(a) The galvanometer shows a deflection when switch S is closed |
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(b) The galvanometer shows a deflection when switch S is open |
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(c) The galvanometer shows no change in deflection whether S is open or closed |
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(d) The galvanometer shows no deflection |
An electron is accelerated through a p.d. of 45.5 volt. The velocity acquired by it is (in ms-1)
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(a) 4 |
(b) 4 |
(c) |
(d) Zero |

Assertion : Anode of Coolidge tube gets heated up at time of emission of X-rays.
Reason : The anode of Coolidge tube is made of a material of high melting point.
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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. |
0.2 Fcapacitor is charged to 600 V by a battery. On removing the battery, it is connected with another parallel plate condenser of 1F. The potential decreases to
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(a) 100 volts |
(b) 120 volts |
(c) 300 volts |
(d) 600 volts |
Assertion : The comet do not obey Kepler's laws of planetary motion
Reason : The comet do not have elliptical orbit
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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 electrons are emitted in the photoelectric effect from a metal surface
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(a) Only if the frequency of the incident radiation is above a certain threshold value |
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(b) Only if the temperature of the surface is high |
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(c) At a rate that is independent of the nature of the metal |
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(d) With a maximum velocity proportional to the frequency of the incident radiation |
Given below are four logic gate symbol (figure). Those for OR, NOR and NAND are respectively

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(a) 1, 4, 3 |
(b) 4, 1, 2 |
(c) 1, 3, 4 |
(d) 4, 2, 1 |