Please be patient as the PDF generation may take up to a minute.

1. 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. \(5~\Omega\)

2.

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. \(60~\Omega\)

3. 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.	\(\dfrac{1}{10}\)

4.

Which among the following options needs to be decreased to increase the sensitivity of a moving coil galvanometer?

1.	the number of turns in the coil.	2.	the area of the coil.
3.	the magnetic field.	4.	the couple per unit twist of the suspension.

5.

A millivoltmeter of 25 mV range is to be converted into an ammeter of 25 A range. The value (in ohm) of necessary shunt will be:
1. 0.001                                     
2. 0.01
3. 1                                           
4. 0.05

6. 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.	\({500 \over 499}G\)

7. 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. \(1000~\Omega\)

8. When will the current sensitivity of a moving coil galvanometer be high?
(\(N=\) number of turns, \(B=\) magnetic field, \(A=\) area of coil, and \(C=\) Torsional constant of spring)

1.	\(N\) is small	2.	\(B\) is small
3.	\(A\) is small	4.	\(C\) is small

9. The current sensitivity of a moving coil galvanometer is \(5\) div/mA and its voltage sensitivity (angular deflection per unit voltage applied) is \(20\) div/V. How much is the resistance of the galvanometer?

1.	\(40~ \Omega\)	2.	\(25~ \Omega\)
3.	\(250~ \Omega\)	4.	\(500~ \Omega\)

10. By which relation is the deflection of the coil \(\theta\) related to the electrical current \(i\) in a moving coil galvanometer?
1. \(i \propto \tan \theta\)
2. \(i \propto \theta\) 
3. \(i \propto \theta^{2}\)
4. \(i \propto \sqrt{\theta}\)

11. What is the relation between voltage sensitivity \((\sigma_v)\) and current sensitivity \((\sigma_i)\) of a moving coil galvanometer? (Resistance of Galvanometer = \(G\))
1. \(\frac{\sigma_{i}}{G} = \sigma_{v}\)
2. \(\frac{\sigma_{v}}{G} =\sigma_{i}\)
3. \(\frac{G}{\sigma_{v}} =\sigma_{i}\)
4. \(\frac{G}{\sigma_{i}} =\sigma_{v}\)

12.

What happens when the number of turns in a galvanometer is doubled?

1.	The voltage sensitivity becomes double.
2.	The current sensitivity becomes double.
3.	the voltage sensitivity becomes half.
4.	The current sensitivity remains the same.

13. 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.	\(\frac{150}{7}~\Omega \)

14. 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

15. A galvanometer of resistance, \(G,\) is shunted by the resistance of \(S\) ohm. How much resistance is to be put in series with the galvanometer to keep the main current in the circuit unchanged?

1.	\({G \over (S+G)}\)	2.	\({S^2 \over (S+G)}\)
3.	\({SG \over (S+G)}\)	4.	\({G^2 \over (S+G)}\)

16.

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