Q. No.A galvanometer has a coil resistance of \(100~\Omega\) and gives a full-scale deflection for \(30\) mA of current. If it is to work as a voltmeter in the \(30\) V range, how much resistance does it require to be added?
1. \(900~\Omega\)
2. \(1800~\Omega\)
3. \(500~\Omega\)
4. \(1000~\Omega\)
1. \(900~\Omega\)
2. \(1800~\Omega\)
3. \(500~\Omega\)
4. \(1000~\Omega\)
Subtopic: Â Conversion to Ammeter & Voltmeter |
 80%
Level 1: 80%+
AIPMT - 2010
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The galvanometer of resistance \(80~\Omega\) deflects a full scale for a potential of \(20\) mV. How much resistance is required for a voltmeter to deflect a full scale of \(5\) V to be made using this galvanometer?
| 1. | resistance of \(19.92~ \text{k} \Omega\) parallel to the galvanometer |
| 2. | resistance of \(19.92~ \text{k} \Omega\) in series with the galvanometer |
| 3. | resistance of \(20 ~\Omega\) parallel to the galvanometer |
| 4. | resistance of \(20~ \Omega\) in series with the galvanometer |
Subtopic: Â Conversion to Ammeter & Voltmeter |
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Level 2: 60%+
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A galvanometer with a resistance of \(36~\Omega\) is changed into an ammeter by using a shunt of \(4~\Omega\). The fraction \(f_0\) of total current passing through the galvanometer will be:
| 1. | \(\dfrac{1}{40}\) | 2. | \(\dfrac{1}{4}\) |
| 3. | \(\dfrac{1}{140}\) | 4. | \(\dfrac{1}{10}\) |
Subtopic: Â Conversion to Ammeter & Voltmeter |
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Level 2: 60%+
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A galvanometer having a coil resistance of \(60~\Omega\) shows full-scale deflection when a current of \(1.0\) A passes through it. How can we convert it into an ammeter capable of reading currents up to \(5.0\) A?
| 1. | putting in series resistance of \(240 ~\Omega \text {. }\) |
| 2. | putting in parallel resistance of \(240 ~\Omega \text {. }\) |
| 3. | putting in series resistance of \(15~ \Omega \text {. }\) |
| 4. | putting in parallel resistance of \(15~ \Omega \text {. }\) |
Subtopic: Â Conversion to Ammeter & Voltmeter |
 79%
Level 2: 60%+
NEET - 2009
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A milliammeter of \(10\) mA has a coil resistance of \(1~\Omega\). To use it as an ammeter of range \(1\) A, the required shunt must have a resistance of:
1. \(\frac{1}{101}~\Omega \)
2. \(\frac{1}{100}~\Omega \)
3. \(\frac{1}{99}~\Omega \)
4. \(\frac{1}{9}~\Omega \)
Subtopic: Â Conversion to Ammeter & Voltmeter |
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Level 2: 60%+
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What properties will a galvanometer that is acting as a voltmeter have?
| 1. | high resistance in series with its coil | 2. | low resistance in parallel with its coil |
| 3. | low resistance in series with its coil | 4. | high resistance in parallel with its coil |
Subtopic: Â Conversion to Ammeter & Voltmeter |
 80%
Level 1: 80%+
AIPMT - 2004
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A galvanometer of resistance \(240~\Omega\) allows only \(4\%\) of the main current after connecting a shunt resistance. What is the value of shunt resistance?
1. \(10~\Omega\)
2. \(20~\Omega\)
3. \(8~\Omega\)
4. \(5~\Omega\)
1. \(10~\Omega\)
2. \(20~\Omega\)
3. \(8~\Omega\)
4. \(5~\Omega\)
Subtopic: Â Conversion to Ammeter & Voltmeter |
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Level 2: 60%+
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When a \(12~\Omega\) 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. \(24~\Omega\)
2. \(36~\Omega\)
3. \(48~\Omega\)
4. \(60~\Omega\)
Subtopic: Â Conversion to Ammeter & Voltmeter |
 70%
Level 2: 60%+
PMT - 2002
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On connecting a shunt of \(10 ~ \Omega,\) the deflection in a moving coil galvanometer falls from \(40\) divisions to \(6\) divisions. What is the resistance of the galvanometer?
| 1. | \(\frac{120}{3}~\Omega \) | 2. | \(\frac{30}{7}~\Omega \) |
| 3. | \(\frac{170}{3}~\Omega \) | 4. | \(\frac{150}{7}~\Omega \) |
Subtopic: Â Conversion to Ammeter & Voltmeter |
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Level 2: 60%+
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A galvanometer having a resistance of \(8\) ohms is shunted by a wire of resistance of \(2\) ohms. If the total current is \(1~\text{A},\) the part of it passing through the shunt will be:
1. \(0.25~\text{A}\)
2. \(0.8~\text{A}\)
3. \(0.2~\text{A}\)
4. \(0.5~\text{A}\)
1. \(0.25~\text{A}\)
2. \(0.8~\text{A}\)
3. \(0.2~\text{A}\)
4. \(0.5~\text{A}\)
Subtopic: Â Conversion to Ammeter & Voltmeter |
 70%
Level 2: 60%+
PMT - 1998
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