An electron and a proton with equal momentum enter perpendicularly into a uniform magnetic field, then
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(a) The path of proton shall be more curved than that of electron |
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(b) The path of proton shall be less curved than that of electron |
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(c) Both are equally curved |
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(d) Path of both will be straight line |
(c) Both are equally curved
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The ratio of charge to potential of a body is known as
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(a) Capacitance |
(b) Conductance |
(c) Inductance |
(d) Resistance |
Three point charges are placed at the corners of an equilateral triangle. Assuming only electrostatic forces are acting
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(a) The system can never be in equilibrium |
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(b) The system will be in equilibrium if the charges rotate about the centre of the triangle |
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(c) The system will be in equilibrium if the charges have different magnitudes and different signs |
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(d) The system will be in equilibrium if the charges have the same magnitudes but different signs |
In X-ray tube when the accelerating voltage V is halved, the difference between the wavelength of Ka line and minimum wavelength of continuous X-ray spectrum
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(a) Remains constant |
(b) Becomes more than two times |
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(c) Becomes half |
(d) Becomes less than two times |
Figure gives a system of logic gates. From the study of truth table it can be found that to produce a high output (1) at R, we must have
| (a) X = 0, Y = 1 | (b) X = 1, Y = 1 | (c) X = 1, Y = 0 | (d) X = 0, Y = 0 |
A NPN transistor conducts when
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(a) Both collector and emitter are positive with respect to the base |
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(b) Collector is positive and emitter is negative with respect to the base |
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(c) Collector is positive and emitter is at same potential as the base |
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(d) Both collector and emitter are negative with respect to the base |
The internal resistance of a cell of e.m.f. 12V is 5 
. It is connected across an unknown resistance. Voltage across the cell, when a current of 60 A is drawn from it, is
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(a) 15 V |
(b) 12 V |
(c) 9 V |
(d) 6 V |
A circular disc of which 2/3 part is coated with yellow and 1/3 part is with blue. It is rotated about its central axis with high velocity, then it will be seen as
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(a) Green |
(b) Brown |
(c) White |
(d) Violet |
Water of volume 2 litre in a container is heated with a coil of 1 kW at 27 oC. The lid of the container is open and energy dissipates at rate of 160 J/s. In how much time temperature will rise from 27oC to 77oC [Given specific heat of water is 4.2 kJ/kg]
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(a) 8 min 20 s |
(b) 6 min 2 s |
(c) 7 min |
(d) 14 min |