The working of dynamo is based on principle of
|
(a) Electromagnetic induction |
(b) Conversion of energy into electricity |
|
(c) Magnetic effects of current |
(d) Heating effects of current |
(a) Electromagnetic induction
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In the following circuit, the resultant capacitance between A and B is 1mF. Then value of C is
|
(a) |
(b) |
(c) |
(d) |
If the magnetic dipole moment of an atom of diamagnetic material, paramagnetic material and ferromagnetic material denoted by 
respectively then
|
(a) |
(b) |
|
(c) |
(d) |
To deposit one gm equivalent of an element at an electrode, the quantity of electricity needed is
|
(a) One ampere |
(b) 96000 amperes |
(c) 96500 farads |
(d) 96500 coulombs |
A wire in the form of a square of side ‘a’ carries a current i. Then the magnetic induction at the centre of the square wire is (Magnetic permeability of free space = 
|
(a) |
(b) |
(c) |
(d) |
Light appears to travel in straight lines since
|
(a) It is not absorbed by the atmosphere |
|
(b) It is reflected by the atmosphere |
|
(c) Its wavelength is very small |
|
(d) Its velocity is very large |
Two resistances 
and 
when connected in series and parallel with 120 V line, power consumed will be 25 W and 100 W respectively. Then the ratio of power consumed by to that consumed by will be
|
(a) 1 : 1 |
(b) 1 : 2 |
(c) 2 : 1 |
(d) 1 : 4 |
