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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When a current passes through a wire whose different parts are maintained at different temperatures, evolution or absorption of heat all along the length of wire is known as
|
(a) Joule effect |
(b) Seebeck effect |
(c) Peltier effect |
(d) Thomson effect |
In any fission process the ratio 
is
|
(a) Less than 1 |
|
(b) Greater than 1 |
|
(c) Equal to 1 |
|
(d) Depends on the mass of the parent nucleus |
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
|
(a) 10 W should be connected in parallel with A |
|
(b) 10 W should be connected in series with A |
|
(c) 5 W should be connected in series with B |
|
(d) 5 W should be connected in parallel with B |
A 50 ohm galvanometer gets full scale deflection when a current of 0.01 A passes through the coil. When it is converted to a 10 A ammeter, the shunt resistance is
|
(a) 0.01 W |
(b) 0.05 W |
(c) 2000 W |
(d) 5000 W |
A point object O is placed on the principal axis of a convex lens of focal length f = 20cm at a distance of 40cm to the left of it. The diameter of the lens is 10cm. An eye is placed 60cm to right of the lens and a distance h below the principal axis. The maximum value of h to see the image is:
The pole pieces of the magnet used in a pivoted coil galvanometer are
|
(a) Plane surfaces of a bar magnet |
|
(b) Plane surfaces of a horse-shoe magnet |
|
(c) Cylindrical surfaces of a bar magnet |
|
(d) Cylindrical surfaces of a horse-shoe magnet |