A potentiometer has uniform potential gradient across it. Two cells connected in series (i) to support each other and (ii) to oppose each other are balanced over 6m and 2m respectively on the potentiometer wire. The e.m.f.’s of the cells are in the ratio of
|
(a) 1 : 2 |
(b) 1 : 1 |
(c) 3 : 1 |
(d) 2 : 1 |
(d) 2 : 1
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A resistor 
dissipates the power P when connected to a certain generator. If the resistor 
is put in series with , the power dissipated by
|
(a) Decreases |
|
(b) Increases |
|
(c) Remains the same |
|
(d) Any of the above depending upon the relative values of |
On increasing the plate separation of a charged condenser, the energy
|
(a) Increases |
(b) Decreases |
(c) Remains unchanged |
(d) Becomes zero |
For the production of X-rays of wavelength 0.1 Å the minimum potential difference will be
|
(a) 12.4 kV |
(b) 24.8 kV |
(c) 124 kV |
(d) 248 kV |
To generate a power of 3.2 mega watt, the number of fissions of 
per minute is (Energy released per fission = 200MeV, 1eV = 1.6 
|
(a) 1.6 |
(b) 6 |
(c) |
(d) 6 |
