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

Electrical Measuring Instruments | Practice MCQs Physics for Mdcat

7 of 79 questions (Page 2 of 12)

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8 To measure the current in an electric device:
Correct Answer: C
Explanation: An ammeter must be connected in series to measure the current flowing through a device.
9 The best instrument for the accurate measurement of the E.M.F. of a cell is:
Correct Answer: C
Explanation: A potentiometer measures EMF without drawing current, providing high accuracy.
10 A voltmeter always gives lower value of p.d. because:
Correct Answer: B
Explanation: The internal resistance of the cell causes a voltage drop, leading to a lower measured p.d.
11 A galvanometer can be converted into a voltmeter by connecting:
Correct Answer: A
Explanation: A high resistance in series increases the range of the galvanometer to measure voltage.
12 To convert a moving coil galvanometer into an ammeter one has to connect:
Correct Answer: B
Explanation: A shunt (small resistance in parallel) diverts most of the current, allowing the galvanometer to measure larger currents.
13 Ohm meter is a device for directly measuring the resistance of conductor. It is a modification of:
Correct Answer: A
Explanation: An ohmmeter is typically a modified moving coil galvanometer.
14 The Wheatstone bridge is most sensitive when:
Correct Answer: A
Explanation: The bridge is most sensitive when the ratio arms are equal (1:1).
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