12 cells each having same emf are connected in series with some cells wrongly connected. The arrangement is connected in series with an ammeter and two cells which are in series. Current is 3 A when cells and battery aid each other and is 2 A when cells and battery oppose each other. The number of cells wrongly connected is
|
(a) 4 |
(b) 1 |
(c) 3 |
(d) 2 |
(b) 1
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In the given figure, potential difference between A and B is
|
(a) 0 |
(b) 5 volt |
(c) 10 volt |
(d) 15 volt |
Einstein's photoelectric equation states that 
. In this equation 
refers to
|
(a) Kinetic energy of all the emitted electrons |
|
(b) Mean kinetic energy of the emitted electrons |
|
(c) Maximum kinetic energy of the emitted electrons |
|
(d) Minimum kinetic energy of the emitted electrons |
In the disintegration series 
the values of Z and A respectively will be
|
(a) 92, 236 |
(b) 88, 230 |
(c) 90, 234 |
(d) 91, 234 |
The radius of two metallic spheres A and B are 
and 
respectively (
. They are connected by a thin wire and the system is given a certain charge. The charge will be greater
|
(a) On the surface of the sphere B |
(b) On the surface of the sphere A |
|
(c) Equal on both |
(d) Zero on both |
Cathode rays travelling from east to west enter into region of electric field directed towards north to south in the plane of paper. The deflection of cathode rays is towards
|
(a) East |
(b) South |
(c) West |
(d) North |