MCQOPTIONS

Explore topic-wise MCQs in Physics.

This section includes 14 Mcqs, each offering curated multiple-choice questions to sharpen your Physics knowledge and support exam preparation. Choose a topic below to get started.

1.	In a galvanometer 15% of the total current in the circuit passes through it. If the resistance of the galvanometer is G, then find out the shunt resistance S that is connected to the galvanometer.
A.	\(\frac {17G}{3}\)
B.	\(\frac {16G}{3}\)
C.	\(\frac {5G}{17}\)
D.	\(\frac {3G}{17}\)
Answer» E.

2.	The current passing through a galvanometer is 30 mA, resistance of the galvanometer is 50 Ω and a shunt is 1 Ω is connected to the galvanometer. What is the maximum current that can be measured by this ammeter?
A.	1.53 A
B.	15.3 A
C.	0.153 A
D.	153 A
Answer» B. 15.3 A

3.	What is the value of the shunt resistance (S) required if a galvanometer has a resistance f 50 Ω and a maximum of 0.05A current that can be passed through it? The ammeter range is changed to 20 A.
A.	0.120 Ω
B.	0.125 Ω
C.	0.130 Ω
D.	0.145 Ω
Answer» C. 0.130 Ω

4.	A moving coil galvanometer has the following characteristics – Number of turns of coil = 50; Area of coil = 70 mm2; Resistance of coil = 30 Ω; Flux density of radial field = 0.1 T; Torsional constant of suspension wire = 7 × 10-8 N m/rad. Calculate the current and voltage sensitivity.
A.	10 div/mA, 0.166 div/mV
B.	15 div/mA, 0.115 div/mV
C.	5 div/mA, 0.167 div/mV
D.	20 div/mA, 0.100 div/mV
Answer» D. 20 div/mA, 0.100 div/mV

5.	When 0.010A current flows through a moving coil galvanometer, it gives full deflection. Then, it is converted into a voltmeter which gives a reading of 10 V using an external resistance of 950 Ω. What is the resistance of the galvanometer (G)?
A.	40 Ω
B.	50 Ω
C.	60 Ω
D.	70 Ω
Answer» C. 60 Ω

6.	A galvanometer has resistance of 10 ohms and a full scale deflection is produced by 5 milli amperes. What is the value of resistance that should be connected in series with it in order to enable it to read 2V?
A.	20 Ω
B.	10 Ω
C.	40 Ω
D.	30 Ω
Answer» E.

7.	The galvanometer shown below has a resistance (RG) of 50.00 Ω. Now, this galvanometer is converted to an ammeter with the help of a shunt resistance (rS) of 0.05 Ω. Calculate the current passing through the galvanometer in both the cases.
A.	0.0545 A, 0.594 A
B.	0.0545 A, 0.05 A
C.	0.0545 A, 0.06 A
D.	0.07 A, 0.05 A
Answer» B. 0.0545 A, 0.05 A

8.	An ideal ammeter has infinite resistance and an ideal voltmeter has zero resistance.
A.	True
B.	False
Answer» C.

9.	What should be the value of shunt resistance of the ammeter in order to increase its range?
A.	S = (n – 1) G
B.	S = (n – 1)/G
C.	S = \(\frac {G}{(n – 1)}\)
D.	S = \(\frac {G}{(n + 1)}\)
Answer» D. S = \(\frac {G}{(n + 1)}\)

10.	How is galvanometer converted into a voltmeter?
A.	By connecting a high resistance multiplier in parallel to the galvanometer
B.	By connecting a low resistance multiplier in parallel to the galvanometer
C.	By connecting a low resistance multiplier in series with the galvanometer
D.	By connecting a high resistance multiplier in series with the galvanometer
Answer» E.

11.	How is a galvanometer converted into an ammeter?
A.	By connecting a high resistance shunt in parallel to the galvanometer
B.	By connecting a low resistance shunt in parallel to the galvanometer
C.	By connecting a high resistance shunt in series with the galvanometer
D.	By connecting a low resistance shunt in series with the galvanometer
Answer» C. By connecting a high resistance shunt in series with the galvanometer

12.	Voltage sensitivity and current sensitivity are related.
A.	True
B.	False
Answer» B. False

13.	Pick out the expression for galvanometer constant from the following?
A.	G = \(\frac {k}{NAB}\)
B.	G = k × NAB
C.	G = \(\frac {NAB}{k}\)
D.	\(\frac {1}{G} \, = \, \frac {k}{NAB}\)
Answer» B. G = k × NAB

14.	What is moving coil galvanometer used for?
A.	Measurement of voltage only
B.	Measurement of resistance
C.	Measurement of small currents
D.	Measurement of electric field
Answer» D. Measurement of electric field