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


7.
Why is the magnetic field in a moving coil galvanometer made radial?
A.
To prevent damage
B.
To increase sensitivity only
C.
To reduce cost
D.
To make the deflection Ο† proportional to current I (linear scale)
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ANSWER :
D. To make the deflection Ο† proportional to current I (linear scale)
8.
The soft iron core in a moving coil galvanometer serves to:
A.
Reduce weight
B.
Make the magnetic field radial and increase its strength
C.
Increase resistance
D.
Provide restoring torque
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ANSWER :
B. Make the magnetic field radial and increase its strength
9.
To convert a galvanometer into an ammeter, we connect:
A.
High resistance in series
B.
High resistance in parallel
C.
Low resistance in series
D.
Low resistance (shunt) in parallel
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ANSWER :
D. Low resistance (shunt) in parallel
10.
To convert a galvanometer into a voltmeter, we connect:
A.
Low resistance in parallel
B.
High resistance in parallel
C.
Low resistance in series
D.
High resistance in series
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ANSWER :
D. High resistance in series
11.
An ammeter should have:
A.
High resistance
B.
Infinite resistance
C.
Variable resistance
D.
Low resistance (ideally zero)
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ANSWER :
D. Low resistance (ideally zero)
12.
A voltmeter should have:
A.
Zero resistance
B.
Zero capacitance
C.
Low resistance
D.
High resistance (ideally infinite)
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ANSWER :
D. High resistance (ideally infinite)