The unit of reduction factor of the tangent galvanometer is 

(1) Ampere

(2) Gauss

(3) Radian

(4) None of these

Subtopic:  Moving Coil Galvanometer |
PMT - 1987
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In order to pass 10% of the main current through a moving coil galvanometer of 99 ohms, the resistance of the required shunt is :

(1) 9.9 Ω

(2) 10 Ω

(3) 11 Ω

(4) 9 Ω

Subtopic:  Conversion to Ammeter & Voltmeter |
 77%
From NCERT
PMT - 1994
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When a 12 Ω resistor is connected in parallel with a moving coil galvanometer, its deflection reduces from 50 divisions to 10 divisions. What will be the resistance of the galvanometer?

1. 24 Ω

2. 36 Ω

3. 48 Ω

4. 60 Ω

Subtopic:  Conversion to Ammeter & Voltmeter |
 69%
From NCERT
PMT - 2002
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A voltmeter has a resistance of G ohms and range V volts. The value of resistance used in series to convert it into a voltmeter of range nV volts is :

(1) nG

(2) (n1)G

(3) Gn 

(4) G(n1)

Subtopic:  Conversion to Ammeter & Voltmeter |
 76%
From NCERT
PMT - 1999
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Which of the following statement is wrong:

(1) Voltmeter should have high resistance

(2) Ammeter should have low resistance

(3) Ammeter is placed in parallel across the conductor in a circuit

(4) Voltmeter is placed in parallel across the conductor in a circuit

Subtopic:  Conversion to Ammeter & Voltmeter |
 69%
From NCERT
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A moving coil galvanometer has a resistance of 50 Ωand gives full scale deflection for 10 mA. How could it be converted into an ammeter with a full scale deflection for 1A :

(1) 50/99 Ω in series

(2) 50/99 Ω in parallel

(3) 0.01 Ω in series

(4) 0.01 Ω in parallel

Subtopic:  Conversion to Ammeter & Voltmeter |
 77%
From NCERT
PMT - 1996
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The resistance of an ideal voltmeter is 

(1) Zero

(2) Very low

(3) Very large

(4) Infinite

Subtopic:  Conversion to Ammeter & Voltmeter |
 67%
From NCERT
PMT - 1998
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The net resistance of a voltmeter should be large to ensure that :

1. It does not get overheated
2. It draws excessive current
3. It can measure large potential difference
4. It does not appreciably change the potential difference to be measured
Subtopic:  Conversion to Ammeter & Voltmeter |
 51%
From NCERT
PMT - 1999
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A galvanometer having a resistance of 8 ohms is shunted by a wire of resistance 2 ohms. If the total current is 1 amp, the part of it passing through the shunt will be :

(1) 0.25 amp

(2) 0.8 amp

(3) 0.2 amp

(4) 0.5 amp

Subtopic:  Conversion to Ammeter & Voltmeter |
 64%
From NCERT
PMT - 1998
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A voltmeter of resistance 1000 Ω gives full-scale deflection when a current of 100 mA flow through it. The shunt resistance required across it to enable it to be used as an ammeter reading 1 A at full-scale deflection is :

(1) 10000 Ω

(2) 9000 Ω

(3) 222 Ω

(4) 111 Ω

Subtopic:  Moving Coil Galvanometer |
 70%
From NCERT
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