- ACharge mobility
- BElectronic mobility
- CStatic electricity
- DCurrent electricity
Explanation:
The study of motion or dynamics of charges constitute an electric current. Therefore, the study of electric charges in motion is called current electricity.
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An external resistance R is connected to a battery of e.m.f. V and internal resistance r. The joule heat produced in resistor R is maximum when R is equal to
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(a) r |
(b) |
(c) 2r |
(d) Infinitely large |
In a transformer, number of turns in the primary are 140 and that in the secondary are 280. If current in primary is 4A then that in the secondary is
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(a) 4 A |
(b) 2 A |
(c) 6 A |
(d) 10 A |
n identical condensers are joined in parallel and are charged to potential V. Now they are separated and joined in series. Then the total energy and potential difference of the combination will be
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(a) Energy and potential difference remain same |
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(b) Energy remains same and potential difference is nV |
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(c) Energy increases n times and potential difference is nV |
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(d) Energy increases n times and potential difference remains same |
The V-i graph for a conductor makes an angle θ with V-axis. Here V denotes the voltage and i denotes current. The resistance of conductor is given by
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(a) sin θ |
(b) cos θ |
(c) tan θ |
(d) cot θ |

Microscope is an optical instrument which
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(a) Enlarges the object |
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(b) Increases the visual angle formed by the object at the eye |
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(c) Decreases the visual angle formed by the object at the eye |
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(d) Brings the object nearer |