- ASmall and negative.
- BSmall and positive.
- CLarge and positive.
- DLarge and negative.
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Semiconductor is damaged by the strong current due to
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(a) Lack of free electron |
(b) Excess of electrons |
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(c) Excess of proton |
(d) None of these |
In a typical Wheatstone network, the resistances in cyclic order are A = 10 W, B = 5 W, C = 4 W and D = 4 W for the bridge to be balanced

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(a) 10 W should be connected in parallel with A |
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(b) 10 W should be connected in series with A |
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(c) 5 W should be connected in series with B |
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(d) 5 W should be connected in parallel with B |
The oscillating electric and magnetic vectors of an electromagnetic wave are oriented along
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(a) The same direction but differ in phase by 90° |
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(b) The same direction and are in phase |
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(c) Mutually perpendicular directions and are in phase |
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(d) Mutually perpendicular directions and differ in phase by 90° |
A rectangular loop is being pulled at a constant speed v, through a region of certain thickness d, in which a uniform magnetic field B is set up. The graph between position x of the right hand edge of the loop and the induced emf E will be

(a)
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(b)
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(c)
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(d)
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A ray of monochromatic light is incident on one refracting face of a prism of angle 75°. It passes through the prism and is incident on the other face at the critical angle. If the refractive index of the material of the prism is , the angle of incidence on the first face of the prism is
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(a) 30° |
(b) 45° |
(c) 60° |
(d) 0° |
The energy of a charged capacitor resides in
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(a) The electric field only
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(b) The magnetic field only |
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(d) Neither in electric nor magnetic field |
(d) Neither in electric nor magnetic field |
AB is a potentiometer wire of length 100 cm and its resistance is 10 ohms. It is connected in series with a resistance R = 40 ohms and a battery of e.m.f. 2 V and negligible internal resistance. If a source of unknown e.m.f. E is balanced by 40 cm length of the potentiometer wire, the value of E is
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(a) 0.8 V |
(b) 1.6 V |
(c) 0.08 V |
(d) 0.16 V |