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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381. In potentiometer experiment, when the galvanometer shows no deflection, then no current flows in:
- A. Galvanometer circuit
- B. Potentiometer wire
- C. Battery
- D. None of above
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Correct answer: Galvanometer circuit- A. Copper
- B. Manganin
- C. Aluminum
- D. Steel
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Correct answer: Manganin- A. Decrease
- B. Increase
- C. Remains unchanged
- D. None of the above
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Correct answer: Increase- A. The lower length of wire than before
- B. The higher length of wire than before
- C. The same length of wire
- D. None of the above
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Correct answer: The lower length of wire than before- A. A potentiometer
- B. A voltmeter
- C. An ammeter
- D. Slide wire bridge
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Correct answer: A potentiometer- A. A
- B. B
- C. C
- D. D
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Correct answer: C- A. Dyne
- B. Siemen
- C. Ohm
- D. Volt
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Correct answer: Siemen388. Secondary cells are:
- A. Non-chargeable
- B. Rechargeable
- C. Both (a), (b)
- D. Like primary cells
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Correct answer: Rechargeable- A. Greater than larger individual resistance
- B. Less than smaller individual resistance
- C. Equal to larger value
- D. Equal to smaller value
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Correct answer: Less than smaller individual resistance- A. Find emf
- B. Compare emf of two cells
- C. Find internal resistance of cell
- D. All of these
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Correct answer: All of these- A. Double
- B. Same
- C. Half
- D. One fourth
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Correct answer: Same- A. Length
- B. Area of cross-section
- C. Resistivity
- D. Mass
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Correct answer: Mass- A. Its temperature increase
- B. Its temperature decrease
- C. Its length increases
- D. None of these
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Correct answer: Its temperature decrease- A. K
- B. K-1
- C. °C
- D. K-2
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Correct answer: K-1- A. 4800 J
- B. 40 J
- C. 144000 J
- D. 14400 J
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Correct answer: 144000 J- A. 1 A
- B. 0.5 A
- C. 2.5 A
- D. 3.5 A
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Correct answer: 0.5 A- A. 20 ohm
- B. 0.5 ohm
- C. 240 ohm
- D. 2 ohm
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Correct answer: 240 ohm- A. 280 x10⁵ J
- B. 288 x 10³ J
- C. 80 J
- D. 400 J
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Correct answer: 288 x 10³ J- A. Internal resistance = External resistance
- B. Internal resistance > External resistance
- C. Internal resistance < External resistance
- D. None of these
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Correct answer: Internal resistance = External resistance- A. Momentum
- B. Charge
- C. Energy
- D. None of these
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Correct answer: Energy