MCQ
Alternative current generator is basically based upon:
- AAmperes law
- BLenz's law
- CFaradays law
- Dcoulombs law
Explanation:
Alternative current generator is based on Faraday's Law. Faraday's Law states that when the magnetic flux linking a circuit changes,an emf is induced in the circuit proportional to the rate of change of flux linkage.
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The sum of the reciprocals of object distance and image distance is equal to the __________ of a mirror.
When a current of 1 ampere is passed through a conductor whose ends are maintained at temperature difference of 1 ℃, the amount of heat evolved or absorbed is called
|
(a) Peltier coefficient |
(b) Thomson coefficient |
|
(c) Thermoelectic power |
(d) Thermo e.m.f. |
Two wires of same material have length L and 2L and cross–sectional areas 4A and A respectively. The ratio of their specific resistance would be
|
(a) 1 : 2 |
(b) 8 : 1 |
(c) 1 : 8 |
(d) 1 : 1 |
A convex lens of focal length 40 cm is in contact with a concave lens of focal length 25 cm. The power of combination is
|
(a) – 1.5 D |
(b) – 6.5 D |
(c) + 6.5 D |
(d) + 6.67 D |