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Q. No.A circuit contains an ammeter, a battery of \(30~\text{V}\), and a resistance \(40.8~\Omega\) all connected in series. If the ammeter has a coil of resistance \(480~\Omega\) and a shunt of \(20~\Omega\), then the reading in the ammeter will be:
1. \(0.5~\text{A}\)
2. \(0.02~\text{A}\)
3. \(2~\text{A}\)
4. \(1~\text{A}\)
In an ammeter, \(0.2 \%\) of the main current passes through the galvanometer. If the resistance of the galvanometer is \(G,\) the resistance of the ammeter will be:
| 1. | \({1 \over 499}G\) | 2. | \({499 \over 500}G\) |
| 3. | \({1 \over 500}G\) | 4. | \({500 \over 499}G\) |
A millivoltmeter of \(25~\text{mV}\) range is to be converted into an ammeter of \(25~\text{A}\) range. The value (in ohm) of the necessary shunt will be:
1. \(0.001\)
2. \(0.01\)
3. \(1\)
4. \(0.05\)
A galvanometer of resistance, \(\mathrm G,\) is shunted by the resistance of \(\mathrm S\) ohm. How much resistance is to be put in series with the galvanometer to keep the main current in the circuit unchanged?
| 1. | \( \mathrm{G \over (S+G)}\) | 2. | \( \mathrm{S^2 \over (S+G)}\) |
| 3. | \( \mathrm{SG \over (S+G)}\) | 4. | \( \mathrm{G^2 \over (S+G)}\) |
A galvanometer has a coil resistance of 100 Ω 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
2. 1800
3. 500
4. 1000
| 1. | Putting in parallel, a resistance of \(24~ \Omega\) |
| 2. | Putting in series, a resistance of \(15~ \Omega\) |
| 3. | Putting in series, a resistance of \(240~ \Omega\) |
| 4. | Putting in parallel, a resistance of \(15~ \Omega\) |
1. \(1050~ \Omega\)
2. \(1550~ \Omega\)
3. \(2050~ \Omega\)
4. \(1500~ \Omega\)
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 |
A galvanometer of \(50~\Omega\) resistance has \(25\) divisions. A current of \(4\times 10^{-4}~\text{A}\) gives a deflection of one division. To convert this galvanometer into a voltmeter having a range of \(25~\text{V}\), it should be connected with a resistance of:
| 1. | \(245~\Omega\) as a shunt |
| 2. | \(2550~\Omega\) in series |
| 3. | \(2450~\Omega\) in series |
| 4. | \(2500~\Omega\) as a shunt |
To convert a galvanometer into a voltmeter one should connect a:
| 1. | high resistance in series with the galvanometer. |
| 2. | low resistance in series with the galvanometer. |
| 3. | high resistance in parallel with the galvanometer. |
| 4. | low resistance in parallel with the galvanometer. |
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