Direction of induced current is given by
Fleming’s left hand rule
Fleming’s right hand rule
Lenz’s law
Newton’s law
The materials which are attracted by magnets are called
Ferromagnetic
Paramagnetic
Bar magnets
Electromagnets
The strength of an electromagnet increases if
The current in the coil increases
The number of turns in the coil increases
the poles are moved close together
All the above
What material is use for making the armature of an electric bell?
Soft iron
Silver
An alloy of iron and steel
Copper
Which of the following is most commonly used galvanometer?
Pivoted type galvanometer
Suspended type galvanometer
Moving coil galvanometer
Which of the following statement is true?
The magnetism induced in iron and steel is temporary
The magnetism induced in iron and steel is permanent
The magnetism induced in iron is permanent while in steel is temporary
The magnetism induced in iron is temporary while in steel is permanent
When a low resistance wire is connected in parallel to the coil of galvanometer, it works as
Voltmeter
Ammeter
Electromagnet
Generator
Which of the following is used to increase or decrease the amplitude of alternating current?
Transformer
Galvanometer
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 speed of the motor can be increased by increasing
Magnetic strength
Current
Number of turns in the coil
