Moving Coil Galvanometer ( its sensitivity, and conversion to ammeter and voltmeter) NEET Questions

Physics - Magnetic Effects of Current and Magnetism

Moving Coil Galvanometer ( its sensitivity, and conversion to ammeter and voltmeter) MCQ Questions


13.
To increase the sensitivity of a moving coil galvanometer, the torsional constant of the suspension wire should be

NEET - 2020

A.
High
B.
Low
C.
Infinity
D.
Zero
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ANSWER :
B. Low
14.
Why is a high resistance connected in series with a galvanometer to convert it into a voltmeter?
A.
To increase the deflection per unit voltage
B.
To reduce the sensitivity of the galvanometer
C.
To prevent excessive deflection
D.
To protect the galvanometer from high voltage
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ANSWER :
A. To increase the deflection per unit voltage
15.
Which of the following is the unit of the sensitivity of a moving coil galvanometer?
A.
A/mA
B.
rad/A
C.
A/V
D.
V/A
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ANSWER :
D. V/A
16.
A galvanometer is converted into an ammeter using a shunt. The shunt resistance is chosen such that

NEET - 2017

A.
The total resistance decreases
B.
The total resistance increases
C.
The deflection remains the same
D.
The sensitivity increases
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ANSWER :
A. The total resistance decreases
17.
The deflection of a moving coil galvanometer is directly proportional to:
A.
Current
B.
Voltage
C.
Magnetic field
D.
Charge
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ANSWER :
A. Current
18.
A galvanometer is converted into an ammeter by connecting a shunt because:
A.
It increases resistance
B.
It decreases resistance
C.
It prevents excess deflection
D.
It prevents heating of the coil
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ANSWER :
B. It decreases resistance