In a triode valve
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(a) If the grid voltage is zero then plate current will be zero |
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(b) If the temperature of filament is doubled, then the thermionic current will also be doubled |
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(c) If the temperature of filament is doubled, then the thermionic current will nearly be four times |
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(d) At a definite grid voltage the plate current varies with plate voltage according to Ohm’s law |
(c) If the temperature of filament is doubled, then the thermionic current will nearly be four times
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On increasing the plate separation of a charged condenser, the energy
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(a) Increases |
(b) Decreases |
(c) Remains unchanged |
(d) Becomes zero |
A conductor ABOCD moves along its bisector with a velocity of 1 m/s through a perpendicular magnetic field of 1 wb/m2, as shown in fig. If all the four sides are of 1m length each, then the induced emf between points A and D is
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(a) 0 |
(b) 1.41 volt |
(c) 0.71 volt |
(d) None of the above |
Two insulated charged spheres of radii 20 cm and 25 cm respectively and having an equal charge Q are connected by a copper wire, then they are separated
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(a) Both the spheres will have the same charge Q |
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(b) Charge on the 20 cm sphere will be greater than that on the 25 cm sphere |
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(c) Charge on the 25 cm sphere will be greater than that on the 20 cm sphere |
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(d) Charge on each of the sphere will be 2Q |
A motor having an armature of resistance 2Ω is designed to operate at 220 V mains. At full speed, it develops a back e.m.f. of 210V. When the motor is running at full speed, the current in the armature is
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(a) 5A |
(b) 105A |
(c) 110A |
(d) 215A |
The refractive index of a material of a prism of angles 45°– 45° – 90° is 1.5. The path of the ray of light incident normally on the hypotenuse side is shown in
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(a)
|
(b)
|
(b)
|
(d)
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The ratio of specific charge of an α -particle to that of a proton is
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(a) 2 : 1 |
(b) 1 : 1 |
(c) 1 : 2 |
(d) 1 : 3 |
