Class 11 Physics · Chapter 9 · Test 3
Current and Ohm's Law
39 MCQs This test covers electric current, drift velocity, conventional current, Ohm’s law, resistance, resistivity and conductance. It also covers temperature dependence of resistance, electrical power, emf, internal resistance and terminal voltage with numericals.
39 questions · 35 min · 39 marks
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Sample questions
The first 5 of 39. Try each one, then tap to see the answer.
Question 1
Electric current is the rate of flow of:
- AMass
- BCharge
- CVoltage
- DEnergy
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Answer: B
I = Q/t.
Question 2
The SI unit of current is the ampere which is equal to:
- AOne volt per ohm second
- BOne joule per coulomb
- COne coulomb per second
- DOne ohm per volt
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Answer: C
1 A = 1 C s^-1.
Question 3
The charge carriers in a metallic conductor are:
- AProtons
- BNeutrons
- CPositive ions
- DFree electrons
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Answer: D
Free electrons carry the current in metals.
Question 4
The drift velocity of electrons in a conductor is typically:
- AEqual to the speed of light
- BVery small about a millimetre per second or less
- CAbout 340 m s^-1
- DAbout 10^6 m s^-1
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Answer: B
Drift velocity is very small even though the current is set up almost instantly.
Question 5
A bulb lights up immediately on switching on because:
- AElectrons move at the speed of light
- BElectrons travel from the switch to the bulb quickly
- CAn electric field is set up almost instantly and all free electrons start drifting
- DThe battery pushes only the nearest electrons
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Answer: C
The field is established along the wire at once so all free electrons start to drift.
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