Current Electricity
Q. Which of the following statements is true about a Wheatstone bridge?
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A.
It can only be used for DC circuits
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B.
It can measure both AC and DC resistances
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C.
It is only used for high resistances
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D.
It requires a power source to function
Solution
A Wheatstone bridge can be used to measure both AC and DC resistances.
Correct Answer: B — It can measure both AC and DC resistances
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Q. Which of the following statements is true regarding a balanced Wheatstone bridge?
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A.
The total resistance is minimized.
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B.
The potential difference across the galvanometer is zero.
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C.
The current through the resistors is equal.
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D.
The resistors must be of equal value.
Solution
In a balanced Wheatstone bridge, the potential difference across the galvanometer is zero, indicating no current flow.
Correct Answer: B — The potential difference across the galvanometer is zero.
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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 a Wheatstone bridge?
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A.
It can only be used for DC circuits.
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B.
It can only be used for AC circuits.
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C.
It can be used for both AC and DC circuits.
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D.
It is only used for measuring voltage.
Solution
A Wheatstone bridge can be used for both AC and DC circuits to measure resistance.
Correct Answer: C — It can be used for both AC and DC circuits.
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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. Which of the following statements is true regarding the Wheatstone bridge?
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A.
It can only measure AC resistances
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B.
It can measure unknown resistances
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C.
It requires a power source to operate
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D.
It is only used in high voltage applications
Solution
The Wheatstone bridge is primarily used to measure unknown resistances by balancing it against known resistances.
Correct Answer: B — It can measure unknown resistances
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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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