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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Heavy water is
|
(a) Water at 4 ℃ |
|
(b) Compound of deuterium and oxygen |
|
(c) Compound of heavy oxygen and heavy hydrogen |
| (d) Water, in which soap does not lather |
Every atom makes one free electron in copper. If 1.1 ampere current is flowing in the wire of copper having 1 mm diameter, then the drift velocity (approx.) will be (Density of copper = 9 and atomic weight = 63)
|
(a) 0.3 mm/sec |
(b) 0.1 mm/sec |
(c) 0.2 mm/sec |
(d) 0.2 mm/sec |
A certain amount of current when flowing in a properly set tangent galvanometer, produces a deflection of 45°. If the current be reduced by a factor of
, the deflection would
| (a) Decrease by 30° | (b) Decrease by 15° | (c) Increase by 15° | (d) Increase by 30° |
Zener diode is used as
|
(a) Half wave rectifier |
(b) Full wave rectifier |
|
(c) ac voltage stabilizer |
(d) dc voltage stabilizer |