ICSE Class 10th Science Chapter 10 - Electro Magnetism Important Questions with Answers

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Which coil of a step up transformer is made thicker and why?

Question 2.

Name the transformer used in the power transmitting station of a power plant.

Question 3.

What type of current is transmitted from the power station?

Question 4.

On reversing the direction of the current in a wire, the magnetic field produced by it gets ______.

gets reversed in direction

increases in strength

decreases in strength

remains unchanged in strength and direction

Question 5.

Why does a current carrying, freely suspended solenoid rest along a particular direction?

Question 6.

State the direction in which current-carrying freely suspended solenoid rests

Question 7.

Give two similarities an AC generator and a DC motor

Question 8.

Name a common device that uses electromagnets.

Question 9.

Name two factors on which the magnitude of an induced e.m.f. in the secondary coil depends.

Question 10.

In the following diagram an arrow shows the motion of the coil towards the bar magnet.
(1) State in which direction the current flows, A to B or B to A?
(2) Name the law used to come to the conclusion.

Question 1.

How is the e.m.f. across primary and secondary coils of a transformer related with the number of turns of the coil in them?

Question 2.

On which type of current do transformers work?

Question 3.

State any two advantages of electromagnets over permanent magnets.

Question 4.

The diagram shows a coil wound around a U shape soft iron bar AB.

1) What is the polarity induced at the ends A and B when the switch is pressed?

2) Suggest one way to strengthen the magnetic field in the electromagnet

3) What will be the polarities at A & B if the direction of current is reversed in the circuit?

Question 5.

State two ways to increase the speed of rotation of a D.C. motor.

Question 6.

A magnet kept at the centre of two coils A and B is moved to and fro as shown in the diagram. The two galvanometers show deflection. State with a reason whether : x > y or x< y [x and y are magnitudes of deflection.]

Question 7.

Draw a neat labeled diagram of an A.C. generator

Question 8.

A coil has a self-inductance of 0·05 Henry. Find the magnitude of the emf induced in it when the current flowing through it is changing at the rate of 100 As^-1.

Question 9.

Why is the core of a transformer made of soft iron?

Question 10.

The diagram below shows an insulated copper wire wound around a hollow cardboard cylindrical tube. Answer the questions that follow:

What are the magnetic poles at A and B when the key K is closed?
State two ways to increase the strength of the magnetic field in this coil without changing the coil.
If we place a soft iron bar at the centre of the hollow cardboard and replace the DC source with an AC source then will it attract small iron pins toward itself when the current is flowing through the coil?