When a 12 Ω resistor is connected with a moving coil galvanometer then its deflection reduces from 50 divisions to 10 divisions. The resistance of the galvanometer is
|
(a) 24 Ω |
(b) 36 Ω |
(c) 48 Ω |
(d) 60 Ω |
(c) 48 Ω
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The plate resistance of a triode is 2.5 × 104 W and mutual conductance is 2 × 10–3 mho. What will be the value of amplification factor
|
(a) 50 |
(b) 1.25 × 107 |
(c) 75 |
(d) 2.25 × 107 |
A power transformer is used to step up an alternating e.m.f. of 220 V to 11 kV to transmit 4.4 kW of power. If the primary coil has 1000 turns, what is the current rating of the secondary ? Assume 100% efficiency for the transformer
|
(a) 4 A |
(b) 0.4 A |
(c) 0.04 A |
(d) 0.2 A |
A parallel plate capacitor of plate separation 2 mm is connected in an electric circuit having source voltage 400 V. if the plate area is 60 cm2, then the value of displacement current for 
will be
|
(a) 1.062 amp |
(b) 1.062 |
(c) 1.062 |
(d) 1.062 |
A resistance of 4
and a wire of length 5 metres and resistance 5 are joined in series and connected to a cell of e.m.f. 10 V and internal resistance 1. A parallel combination of two identical cells is balanced across 300 cm of the wire. The e.m.f. E of each cell is
|
(a) 1.5 V |
(b) 3.0 V |
(c) 0.67 V |
(d) 1.33 V |
Two parallel plates separated by a distance of 5mm are kept at a potential difference of 50 V. A particle of mass 
and charge 
enters in it with a velocity 
. The acceleration of the particle will be
|
(a) |
(b) |
(c) |
(d) 2 |
When a slow neutron goes sufficiently close to a 
nucleus, then the process that takes place is
|
(a) Fission of |
(b) Fusion of neutron |
(c) Fusion of |
(d) First (a) then(b) |
In a parallel beam of white light is incident on a converging lens, the colour which is brought to focus nearest to the lens is
|
(a) Violet |
(b) Red |
|
(c) The mean colour |
(d) All the colours together |
