Explore topic-wise MCQs in Physics Questions and Answers.

This section includes 4 Mcqs, each offering curated multiple-choice questions to sharpen your Physics Questions and Answers knowledge and support exam preparation. Choose a topic below to get started.

1.

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
Discussion
2.

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
Discussion
3.

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
Discussion
4.

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
Discussion