Function of rectifier is
|
(a) To convert ac into dc |
(b) To convert dc into ac |
|
(c) Both (a) and (b) |
(d) None of these |
Function of rectifier is
|
(a) To convert ac into dc |
(b) To convert dc into ac |
|
(c) Both (a) and (b) |
(d) None of these |
(a) To convert ac into dc
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A potentiometer circuit shown in the figure is set up to measure e.m.f. of a cell E. As the point P moves from X to Y the galvanometer G shows deflection always in one direction, but the deflection decreases continuously until Y is reached. In order to obtain balance point between X and Y it is necessary to
|
(a) Decreases the resistance R |
(b) Increase the resistance R |
|
(c) Reverse the terminals of battery V |
(d) Reverse the terminals of cell E |
The armature of dc motor has 20Ω resistance. It draws current of 1.5 ampere when run by 220 volts dc supply. The value of back e.m.f. induced in it will be
|
(a) 150 V |
(b) 170 V |
(c) 180 V |
(d) 190 V |
The refractive indices of violet and red light are 1.54 and 1.52 respectively. If the angle of prism is 10°, then the angular dispersion is
|
(a) 0.02 |
(b) 0.2 |
(c) 3.06 |
(d) 30.6 |

When light travels from glass to air, the incident angle is
and the refracted angle is
. The true relation is
|
(a) |
(b) |
(c) |
(d) Not predictable |
The mass and energy equivalent to 1 a.m.u. respectively
|
(a) 1.67 |
(b) 1.67 |
|
(c) 1.67 |
(d) 1.67 |