A capacitor is kept connected to the battery and a dielectric slab is inserted between the plates. During this process
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(a) No work is done |
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(b) Work is done at the cost of the energy already stored in the capacitor before the slab is inserted |
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(c) Work is done at the cost of the battery |
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(d) Work is done at the cost of both the capacitor and the battery |
(c) Work is done at the cost of the battery
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Two capacitors C1 and C2 = 2C1 are connected in a circuit with a switch between them as shown in the figure. Initially the switch is open and C1 holds charge Q. The switch is closed. At steady state, the charge on each capacitor will be
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(a) Q, 2Q |
(b) Q/3, 2Q/3 |
(c) 3Q/2, 3Q |
(d) 2Q/3, 4Q/3 |
The smallest temperature difference that can be measured with a combination of a thermocouple of thermo e.m.f. 30mV per degree and a galvanometer of 50 ohm resistance, capable of measuring a minimum current of 3 × 10–7 amp is
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(a) 0.5 degree |
(b) 1.0 degree |
(c) 1.5 degree |
(d) 2.0 degree |
Two positive charges of 20 coulomb and Q coulomb are situated at a distance of 60 cm. The neutral point between them is at a distance of 20 cm from the 20 coulomb charge. Charge Q is
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(a) 30 C |
(b) 40 C |
(c) 60 C |
(d) 80 C |
In the circuit given, the correct relation to a balanced Wheatstone bridge is
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(a) |
(b) |
(c) |
(d) None of these |
has half life 5700 years. At the end of 11400 years, the actual amount left is
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(a) 0.5 of original amount |
(b) 0.25 of original amount |
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(c) 0.125 of original amount |
(d) 0.0625 of original amount |
When a ray of light emerges from a block of glass, the critical angle is
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(a) Equal to the angle of reflection |
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(b) The angle between the refracted ray and the normal |
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(c) The angle of incidence for which the refracted ray travels along the glass-air boundary |
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(d) The angle of incidence |
Figure represents a graph of kinetic energy (K) of photoelectrons (in eV) and frequency (v) for a metal used as cathode in photoelectric experiment. The work function of metal is
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(a) 1 eV |
(b) 1.5 eV |
(c) 2 eV |
(d) 3 eV |
