- AIncreasing the e.m.f of the cell.
- BIncreasing the length of the potentiometer.
- CDecreasing the length of the potentiometer wire.
- DNone of these.
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Light of wavelength is 700 Å in air. It has a wavelength in glass (μ = 1.5) equal to
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(a) 7200 Å |
(b) 4800 Å |
(c) 10800 Å |
(d) 7201.5 Å |
A Daniel cell is balanced on 125 cm length of a potentiometer wire. Now the cell is short-circuited by a resistance 2 ohm and the balance is obtained at 100 cm. The internal resistance of the Daniel cell is
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(a) 0.5 ohm |
(b) 1.5 ohm |
(c) 1.25 ohm |
(d) 4/5 ohm |
A ray of light incident at an angle θ on a refracting face of a prism emerges from the other face normally. If the angle of the prism is 5º and the prism is made of a material of refractive index 1.5, the angle of incidence is:
Two insulated rings, one of slightly smaller diameter than the other are suspended along their common diameter as shown. Initially the planes of the rings are mutually perpendicular. When a steady current is set up in each of them
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(a) The two rings rotate into a common plane |
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(b) The inner ring oscillates about its initial position |
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(c) The inner ring stays stationary while the outer one moves into the plane of the inner ring |
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(d) The outer ring stays stationary while the inner one moves into the plane of the outer ring |
A signal emitted by an antenna from a certain point can be received at another point of the surface in the form of
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(a) Sky wave |
(b) Ground wave |
(c) Sea wave |
(d) Both (a) and (b) |
There is 10 units of charge at the centre of a circle of radius 10m. The work done in moving 1 unit of charge around the circle once is
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(a) Zero |
(b) 10 units |
(c) 100 units |
(d) 1 unit |
An iron rod of volume and relative permeability 1000 is placed inside a long solenoid wound with 5 turns/cm. If a current of 0.5 A is passed through the solenoid, then the magnetic moment of the rod is
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(a) 10 |
(b) 15 |
(c) 20 |
(d) 25 |
The two bulbs as in the above question are connected in series to a 200 volt line. Then
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(a) The potential drop across the two bulbs is the same |
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(b) The potential drop across the 40 watt bulb is greater than the potential drop across the 100 watt bulb |
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(c) The potential drop across the 100 W bulb is greater than the potential drop across the 40 W bulb |
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(d) The potential drop across both the bulb is 200 volt |