Potentiometer
Q. Which of the following factors does NOT affect the accuracy of a potentiometer?
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A.
Temperature
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B.
Length of the wire
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C.
Material of the wire
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D.
Color of the wire
Solution
The color of the wire does not affect the accuracy of a potentiometer; however, temperature, length, and material do.
Correct Answer: D — Color of the wire
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Q. Which of the following is NOT a use of a potentiometer?
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A.
Measuring emf of a cell.
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B.
Comparing emf of two cells.
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C.
Measuring resistance directly.
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D.
Calibrating voltmeters.
Solution
A potentiometer is not used for direct resistance measurement; it is primarily used for voltage measurements.
Correct Answer: C — Measuring resistance directly.
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Q. Which of the following materials is commonly used for potentiometer wires?
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A.
Copper
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B.
Aluminum
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C.
Constantan
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D.
Silver
Solution
Constantan is commonly used for potentiometer wires due to its stable resistance over a range of temperatures.
Correct Answer: C — Constantan
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Q. Which of the following materials is commonly used for the wire in a potentiometer?
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A.
Copper
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B.
Aluminum
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C.
Constantan
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D.
Silver
Solution
Constantan is commonly used for potentiometer wires due to its stable resistance over a range of temperatures.
Correct Answer: C — Constantan
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Q. Which of the following statements about a potentiometer is true?
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A.
It can only measure AC voltages.
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B.
It requires a constant current for accurate measurements.
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C.
It can measure both AC and DC voltages.
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D.
It is only used in laboratory settings.
Solution
A potentiometer requires a constant current to ensure accurate measurements of voltage.
Correct Answer: B — It requires a constant current for accurate measurements.
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Q. Which of the following statements is true regarding a potentiometer?
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A.
It can measure both AC and DC voltages
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B.
It can only measure DC voltages
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C.
It can only measure AC voltages
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D.
It cannot measure voltages
Solution
A potentiometer can measure both AC and DC voltages, but it is primarily used for DC measurements due to its principle of operation.
Correct Answer: B — It can only measure DC voltages
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Q. Which of the following statements is true regarding the use of a potentiometer?
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A.
It can measure current directly
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B.
It requires a galvanometer for operation
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C.
It can only measure AC voltages
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D.
It is not affected by the internal resistance of the source
Solution
A potentiometer is not affected by the internal resistance of the source because it measures voltage by balancing it against a known voltage.
Correct Answer: D — It is not affected by the internal resistance of the source
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Q. Why is a potentiometer preferred over a voltmeter for measuring voltage?
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A.
It is cheaper
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B.
It provides more accurate measurements
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C.
It is easier to use
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D.
It requires less power
Solution
A potentiometer is preferred because it provides more accurate measurements as it does not draw current from the circuit.
Correct Answer: B — It provides more accurate measurements
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