Choose the correct option:

- AA: Virtual Image, B: Real Image
- BA: Real Image, B: Virtual Image
- CA: Real Image, B: Real Image
- DA: Virtual Image, B: Virtual Image
Choose the correct option:

Explanation:
As shown in figure A, a virtual image is formed because refracted rays only appear to meet at the image.
As shown in figure B, a real image is formed because refracted rays actually meet at the image.
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Electric power is transmitted over long distances through conducting wires at high voltage because
|
(a) High voltage travels faster |
|
(b) Power loss is large |
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(c) Power loss is less |
|
(d) Generator produced electrical energy at a very high voltage |
Which of the following statement is true
|
(a) The presence of a large magnetic flux through a coil maintains a current in the coil if the circuit is continuous |
|
(b) A coil of a metal wire kept stationary in a non-uniform magnetic field has an e.m.f. induced in it |
|
(c) A charged particle enters a region of uniform magnetic field at an angle of 85° to the magnetic lines of force;the path of the particle is a circle |
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(d) There is no change in the energy of a charged particle moving in a magnetic field although a magnetic force is acting on it |
In the circuit of a triode valve, there is no change in the plate current, when the plate potential is increased from 200 volt to 220 volt and the grid potential is decreased from – 0.5 volt to –1.3 volt. The amplification factor of this valve is
|
(a) 15 |
(b) 20 |
(c) 25 |
(d) 35 |
Gauss’s law is true only if force due to a charge varies as
|
(a) |
(b) |
(c) |
(d) |
In the following reaction the value of ‘X’ is ![]()
|
(a) |
(b) |
(c) |
(d) |
A current i ampere flows in a circular arc of wire whose radius is R, which subtend an angle 3π/2 radian at its centre. The magnetic induction B at the centre is

|
(a) |
(b) |
(c) |
(d) |