What material is use for making the armature of an electric bell?
Soft iron
Silver
An alloy of iron and steel
Copper
When a low resistance wire is connected in parellel to the coil of galvanometer, it works as
Voltmeter
Ammeter
Electromagnet
Generator
Direction of induced current is given by
Fleming’s left hand rule
Fleming’s right hand rule
Lenz’s law
Newton’s law
Which of the following law states the law of conservation of energy?
All the above
Which of the following is used to measure the current in a circuit?
Galvanometer
Rheostat
A d.c motor converts
Electrical energy into mechanical energy
Mechanical energy into electrical energy
Electrical energy into heat energy
Mechanical energy into heat energy
The materials which are attracted by magnets are called
Ferromagnets
Paramagnets
Bar magnets
Electromagnets
Which one of the following is used to increase a.c potential?
A.c generator
D.c generator
Step-up transformer
Step-down transformers
A device is used to transform 12 V d.c. to 200 V a.c.What is the name of the device?
Step-down transformer
Moving coil galvanometer
The speed of the motor can be increased by increasing
Magnetic strength
Current
Number of turns in the coil
