Electrical Measuring Instruments | Practice MCQs Physics for Mdcat | mosaicbro.com

Electrical Measuring Instruments | Practice MCQs Physics for Mdcat

7 of 79 questions (Page 10 of 12)

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64 In order to increase the range of an Ammeter, the shunt resistance is:
Correct Answer: B
Explanation: A smaller shunt resistance allows more current to bypass the galvanometer, increasing the ammeter's range.
65 A galvanometer can be converted into ammeter by connecting:
Correct Answer: D
Explanation: A low resistance (shunt) in parallel converts a galvanometer into an ammeter.
66 Wheatstone bridge is an arrangement consisting of:
Correct Answer: B
Explanation: A Wheatstone bridge consists of four resistors arranged in a diamond configuration.
67 A balanced Wheatstone bridge is used to determine:
Correct Answer: C
Explanation: The Wheatstone bridge is primarily used to measure unknown resistances accurately.
68 When the Wheatstone bridge is balanced then:
Correct Answer: B
Explanation: At balance, no current flows through the galvanometer, and the potential difference across it is zero.
69 Which of the following instrument can measure the unknown resistance with sufficient accuracy:
Correct Answer: D
Explanation: A post office box provides high accuracy in measuring unknown resistances using the Wheatstone bridge principle.
70 Post office box is a practical form of:
Correct Answer: C
Explanation: The post office box is a practical implementation of the Wheatstone bridge.
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