If the current is doubled, the deflection is also doubled in
|
(a) A tangent galvanometer |
(b) A moving coil galvanometer |
|
(c) Both (a) and (b) |
(d) None of these |
(b) A moving coil galvanometer
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A current of 2 A passing through conductor produces 80 J of heat in 10 seconds. The resistance of the conductor is
|
(a) 0.5 Ω |
(b) 2 Ω |
(c) 4 Ω |
(d) 20 Ω |
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 |
Light of frequency n is incident on a certain photoelectric substance with threshold frequency n0. The work function for the substance is
|
(a) hn |
(b) hn0 |
(c) |
(d) |
A charge q is placed at the centre of the open end of cylindrical vessel. The flux of the electric field through the surface of the vessel is
|
(a) Zero |
(b) |
(c) |
(d) |
Two parallel wires are carrying electric currents of equal magnitude and in the same direction. They exert
|
(a) An attractive force on each other |
(b) A repulsive force on each other |
|
(c) No force on each other |
(d) A rotational torque on each other |
What is used as a moderator in a nuclear reactor
| (a) Water | (b) Graphite |
(c) Cadmium |
(d) Steel |
A small bar magnet has a magnetic moment 1.2 A-m2. The magnetic field at a distance 0.1 m on its axis will be : (m0 = 4p × 10–7 T-m/A)
|
(a) 1.2 × 10–4 T |
(b) 2.4 × 10–4 T |
(c) 2.4 × 104 T | (d) 1.2 × 104 T |
