Objective questions of current electricity
OBJECTIVE QUESTIONS OF CURRENT
This topic provide important objective questions for electric current it will be very important for the students preparing for class 12th board examination or JEE/NEET
- For which of the following dependence of drift velocity ʋ on electric field E is ohm’s law obeyed?
- (a) ʋ ꭀ E (b) ʋ = constant (c) ʋ ꭀ E1/2 (d) ʋ ꭀ E2
- in metals the time of relaxation of electrons:
- (a)increases with increasing temperature
- (b)decreases with increasing temperature
- (c)does not depend on temperature
- (d)changes suddenly at 400 K
- Constantan wire is used for making standard resistance because it has:
- (a)low specific resistance
- (b)high specific resistance
- (c)negligible temperature coefficient of resistance
- (d)high melting point
- A potential difference is applied across the ends of a metallic wire. If the potential difference is doubled, the drift velocity:
- (a)will be doubled (c) will be quadrupled
- (b)will be halved (d) will remain unchanged
- The maximum current that flows in the fuse wire, before it blow out, varies with the radius r as:
- (a)r3/2 (b) r (c) r2/3 (d) r1/2
- To download entire questions paper click here-click here electric current objective questions
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