In an experiment, a graph was plotted of the potential difference V between the terminals of a cell against the circuit current i by varying load rheostat. Internal conductance of the cell is given by
|
(a) xy |
(b) |
(c) |
(d) (x – y) |
(b) 
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In a diode AM-detector, the output circuit consist of R = 1kW and C = 10 pF. A carrier signal of 100 kHz is to be detected. Is it good
|
(a) Yes |
(b) No |
|
(c) Information is not sufficient |
(d) None of these |
If half life of radium is 77 days. Its decay constant in day will be
|
(a) 3 |
(b) |
(c) 1 |
(d) 6 |
In an inductor of inductance L = 100 mH, a current of I = 10A is flowing. The energy stored in the inductor is
|
(a) 5 J |
(b) 10 J |
(c) 100 J |
(d) 1000 J |
How much water should be filled in a container 21 cm in height, so that it appears half filled when viewed from the top of the container (given that a
= 4/3)
|
(a) 8.0 cm |
(b) 10.5 cm |
(c) 12.0 cm |
(d) None of the above |
To compare magnetic moments of two magnets by vibration magnetometer, 'sum and difference method' is better because
|
(a) Determination of moment of inertia is not needed which minimises the errors |
| (b) Less observations are required |
| (c) Comparatively less calculations |
| (d) All the above |
The (𝜏 – 𝜃) graph for a coil is
|
(a)
|
(b)
|
(c)
|
(d)
|
Wires P and Q have the same resistance at ordinary (room) temperature. When heated, resistance of P increases and that of Q decreases. We conclude that
|
(a) P and Q are conductors of different materials |
|
(b) P is N-type semiconductor and Q is P-type semiconductor |
|
(c) P is semiconductor and Q is conductor |
|
(d) P is conductor and Q is semiconductor |
The magnetic field B with in the solenoid having n turns per metre length and carrying a current of i ampere is given by
|
(a) |
(b) |
(c) 4π |
(d) ni |
