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Free Current Electricity MCQs with Answers

1,052 Current Electricity MCQs from Physics, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.

Steady current relates charge flow to potential difference, resistance and resistivity, including how temperature changes a conductor's resistance. Sources with internal resistance have terminal voltage below their emf when delivering current, and maximum power output occurs under a specific load condition rather than at zero resistance.

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Steady CurrentResistance and ResistivityTemperature Coefficient of ResistivityInternal Resistance of SourcesMaximum Power Output
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1,052 questions · page 18 of 53

341. Algebraic sum of currents meeting at a point is zero according to

  • A. Faraday's law
  • B. Ampere's law
  • C. Kirchhoff first rule
  • D. None of above

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Correct answer: Kirchhoff first rule

342. If both fixed as well as the sliding contact of a rheostat are connected in a circuit,it is to be used as

  • A. Variable resistor
  • B. Power supply
  • C. Potential divider
  • D. Both (a) and (c)

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Correct answer: Both (a) and (c)

343. When ever current is drawn from the battery, its emf and terminal potential difference became

  • A. Equal
  • B. Different
  • C. Zero
  • D. Negative

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Correct answer: Equal

344. Complex system consisting of many resistances can be solved by

  • A. Faraday's law
  • B. Ohm's law
  • C. Kirchhoff rules
  • D. Ampere's law

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Correct answer: Kirchhoff rules

345. Kirchoff first rule is also called the law of conservation of

  • A. Momentum
  • B. Mass
  • C. Energy
  • D. Charge

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Correct answer: Charge

346. If the source of emf is traversed from negative to positive terminal, the potential change are

  • A. Positive
  • B. Negative
  • C. Constant
  • D. Zero

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Correct answer: Positive

347. If the source of emf traversed from positive to negative terminals, the potential change are

  • A. Negative
  • B. Constant
  • C. Zero
  • D. Positive

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Correct answer: Negative

348. If the resistor is resistor is taversed in the direction of current, the potential change are

  • A. Negative
  • B. Zero
  • C. Constant
  • D. Positive

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Correct answer: Negative

349. When the Wheatstone bridge is balanced the galvanometer shows zero deflection because:

  • A. Both the terminals of galvanometer are at the same potential
  • B. Both terminals of the galvanometer have maximum potential
  • C. The resistance of galvanometer becomes zero
  • D. The resistance of galvanometer becomes maximum

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Correct answer: Both the terminals of galvanometer are at the same potential

350. Wheat stone bridge is an arrangement consisting of:

  • A. Four resistances
  • B. Three resistances
  • C. Five resistances
  • D. None of above

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Correct answer: Four resistances

351. A balanced Wheatstone bridge is used to measure the

  • A. Current
  • B. Potential difference
  • C. An unknown resistance
  • D. None of above

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Correct answer: An unknown resistance

352. The condition for the Wheatstone bridge to be balanced is given by:

  • A. R1/R2 = R3/R4
  • B. R2/R1 = R4/R3
  • C. R1/R2 = R4/R3
  • D. None of above

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Correct answer: R1/R2 = R3/R4

353. Which one of the following instrument can measure the unknown resistance with sufficient accuracy

  • A. Potentiometer
  • B. Slide wire bridge
  • C. Galvanometer
  • D. All of above

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Correct answer: Slide wire bridge

354. 124.Slide wire bridge is a practical form of the

  • A. Voltmeter
  • B. Galvanometer
  • C. Wheatstone bridge
  • D. Ammeter

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Correct answer: Wheatstone bridge

355. An instrument which can measure potential without drawing any current is called:

  • A. Voltmeter
  • B. Potentiometer
  • C. Galvanometer
  • D. Ammeter

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Correct answer: Potentiometer

356. A device which gives continuously varying _ is called potential divider.

  • A. Potential difference
  • B. Capacitance
  • C. Charge
  • D. Inductance

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Correct answer: Potential difference

357. The instrument used to measure the emf of two cells is called

  • A. A potentiometer
  • B. An ammeter
  • C. A galvanometer
  • D. All of above

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Correct answer: A potentiometer

358. Which device is used to determine internal resistance of a cell

  • A. Potentiometer
  • B. Wheat stone bridge
  • C. Voltmeter
  • D. Ammeter

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Correct answer: Potentiometer

359. The algebraic sum of potential changes for a closed circuit is zero according to

  • A. Kirchhoff's 2nd rule
  • B. Kirchhoff's first rule
  • C. Ampere's law
  • D. Joule's law

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Correct answer: Kirchhoff's 2nd rule

360. Internal resistance is the resistance offered by

  • A. The conductor
  • B. The circuit
  • C. The resistor
  • D. Source of emf

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Correct answer: Source of emf
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