- AConnecting an inductor in series with the load
- BConnecting a capacitor in series with the load
- CConnecting an inductor in parallel with the load
- DConnecting a capacitor in parallel with the load
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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 |
Two wires A and B of same material and mass have their lengths in the ratio 1 : 2. On connecting them to the same source, the rate of heat dissipation in B is found to be 5W. The rate of heat dissipation in A is
|
(a) 10W |
(b) 5W |
(c) 20W |
(d) None of these |
The intensity of X-rays from a Coolidge tube is plotted against wavelength as shown in the figure. The minimum wavelength found is
and the wavelength of the
line is
. As the accelerating voltage is increased

|
(a) ( |
(b) ( |
(c) |
(d) |
99% of a radioactive element will decay between
|
(a) 6 and 7 half lives |
(b) 7 and 8 half lives |
|
(c) 8 and 9 half lives |
(d) 9 half lives |
The electric potential inside a conducting sphere
|
(a) Increases from centre to surface |
|
(b) Decreases from centre to surface |
|
(c) Remains constant from centre to surface |
|
(d) Is zero at every point inside |
A charge Q is divided into two parts of q and Q - q. If the coulomb repulsion between them when they are separated is to be maximum, the ratio of should be
|
(a) 2 |
(b) 1/2 |
(c) 4 |
(d) 1/4 |
The time period of a freely suspended magnet is 4 seconds. If it is broken in length into two equal parts and one part is suspended in the same way, then its time period will be
| (a) 4 sec | (b) 2 sec | (c) 0.5 sec | (d) 0.25 sec |
Angle of prism is A and its one surface is silvered. Light rays falling at an angle of incidence 2A on first surface return back through the same path after suffering reflection at second silvered surface. Refractive index of the material of prism is
|
(a) 2 sin A |
(b) 2 cos A |
(c) |
(d) tan A |
If a high power heater is connected to electric mains, then the bulbs in the house become dim, because there is a
|
(a) Current drop |
(b) Potential drop |
(c) No current drop |
(d) No potential drop |