A fully charged capacitor has a capacitance ‘C’. It is discharged through a small coil of resistance wire embedded in a thermally insulated block of specific heat capacity ‘s’ and mass ‘m’. If the temperature of the block is raised by ‘ ∆T ’, the potential difference ‘V’ across the capacitance is
|
(a) |
(b) |
(c) |
(d) |
(b) 
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P-type semiconductors are made by adding impurity element
|
(a) As |
(b) P |
(c) B |
(d) Bi |
On passing 96500 coulomb of charge through a solution 
the amount of copper liberated is
|
(a) 64 gm |
(b) 32 gm |
(c) 32 kg |
(d) 64 kg |
If n, e, τ and m respectively represent the density, charge relaxation time and mass of the electron, then the resistance of a wire of length l and area of cross-section A will be
|
(a) |
(b) |
(c) |
(d) |
The amount of charge required to liberate 9 gm of aluminium (atomic weight = 27 and valency = 3) in the process of electrolysis is (Faraday's number = 96500 coulombs/gm equivalent)
|
(a) 321660 coulombs |
(b) 69500 coulombs |
(c) 289500 coulombs |
(d) 96500 coulombs |
The process of superimposing signal frequency (i.e. audio wave) on the carrier wave is known as
|
(a) Transmission |
(b) Reception |
(c) Modulation |
(d) Detection |
The cause of the potential barrier in a P-N diode is
|
(a) Depletion of positive charges near the junction |
|
(b) Concentration of positive charges near the junction |
|
(c) Depletion of negative charges near the junction |
|
(d) Concentration of positive and negative charges near the junction |
Which rays are not the portion of electromagnetic spectrum
|
(a) X-rays |
(b) Microwaves |
(c) a-rays |
(d) Radio waves |
