When a PN junction diode is reverse biased
|
(a) Electrons and holes are attracted towards each other and move towards the depletion region |
|
(b) Electrons and holes move away from the junction depletion region |
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(c) Height of the potential barrier decreases |
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(d) No change in the current takes place |
(b) Electrons and holes move away from the junction depletion region
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Which of the following statement is true
|
(a) Velocity of light is constant in all media |
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(b) Velocity of light in vacuum is maximum
|
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(c) Velocity of light is same in all reference frames |
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(d) Laws of nature have identical form in all reference frames |
The specific resistance of a wire is ρ, its volume is 3 
and its resistance is 3 ohms, then its length will be
|
(a) |
(b) |
(c) |
(d) |
An ammeter gives full deflection when a current of 2 amp. flows through it. The resistance of ammeter is 12 ohms. If the same ammeter is to be used for measuring a maximum current of 5 amp., then the ammeter must be connected with a resistance of
|
(a) 8 ohms in series |
(b) 18 ohms in series |
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(c) 8 ohms in parallel |
(d) 18 ohms in parallel |
A parallel beam of monochromatic light is incident at one surface of a equilateral prism. Angle of incidence is 55° and angle of emergence is 46°. The angle of minimum deviation will be
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(a) Less than 41° |
(b) Equal to 41° |
(c) More than 41° |
(d) None of the above |
E denotes electric field in a uniform conductor, I corresponding current through it, 
drift velocity of electrons and P denotes thermal power produced in the conductor, then which of the following graph is incorrect
|
(a)
|
(b)
|
(c)
|
(d)
|
An infinite number of charges, each of charge 1 mC, are placed on the x-axis with co-ordinates x = 1, 2, 4, 8, ....¥. If a charge of 1 C is kept at the origin, then what is the net force acting on 1 C charge
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(a) 9000 N |
(b) 12000 N |
(c) 24000 N |
(d) 36000 N |
