CBSE Worksheet for chapter-4 Magnetic Effect of Current and EMI class 10

Worksheet For class 10

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Summary

• Electromagnetic Induction - Faradays law. Lenz’s Law
• Generator – Types, Construction and working
• Electric motor – Types, Construction and working

Section 1 - Objective

Q1. The device which is used for converting mechanical energy into electrical energy is called:

1. Electric motor
2. Dynamo
3. Transformer
4. Battery

Q2. Lenz’s law is a consequence of the law of conservation of:

1. Energy
2. Momentum
3. Angular momentum
4. Charge and mass

Q3. In a DC generator, the induced emf. in the armature is :

1. DC
2. AC
3. Fluctuating DC
4. Both AC and DC

Q4. The induced emf produced when a magnet is inserted into a coil does not depend upon:

1. The number of turns in the coil
2. The resistance of the coil
3. The magnetic moment of the magnet
4. The speed of approach of the magnet

Q5. Lenz’s law:

1. Is the same as the right hand palm rule
2. Determines the magnitude of an induced emf
3. Bears no relation to the law of conservation of energy
4. Is useful in deciding about the direction of an induced emf

Q6. When the current through a solenoid increases at constant rate, the induced current:

1. Is a constant and in a direction of inducing current
2. Is constant and is opposite to the direction of inducing current
3. Increases with time and is in the direction of inducing current
4. Increases with time and is opposite to the direction of inducing current

Q7. The device which is used for converting electrical energy into mechanical energy is called:

1. Electric motor
2. Dynamo
3. Transformer
4. Battery

Q8. The current in the armature of a DC motor is maximum when:

1. The motor achieves maximum speed
2. The motor achieves intermediate speed
3. The motor is switched on
4. The motor is switched off

Q9. The effect of using split rings in a simple DC motor is that:

1. The direction of rotation of the coil is reversed
2. The current in the coil always flows in the same direction
3. The direction of the current flowing in the coil is reversed
4. None of these

Section 2 - Subjective

Q1. Explain electromagnetic induction.

Q2. State faraday’s law of Electromagnetic industries.

Q3. State Fleming’s Right Hand rule.

Q4. A motor converts one form of energy into another. Name the two forms. Draw the diagram of electric motor and also describe it.

Q5. What is the function of a commutator in electric motor ?

Q6. Explain the working of A.C generator with a neat and labelled diagram.

Q7. The given magnet is divided into three parts A, B and C.

A

B

C

Q8. Name the parts where the strength of the magnetic field is:

(i) Maximum

(ii) Minimum

Q9. How will density of magnetic field lines differ at these parts?

Q10. A coil of insulated copper wire is connected to a galvanometer as shown in the diagram. State your observations when a bar magnet is:

(i) Pushed into the coil with its north pole entering first.

(ii) Held at rest inside the coil.

(iii)Name the phenomenon responsible for the above observation.

Q11. State Flemings’s Left Hand Rule.

Q12. What is short-circuiting of an electric circuit? An electric motor of 1.5kW power rating is operated in a domestic electric circuit of current rating 5A. What would happen when it is switched ON? Give reason for your answer.

Solutions for Section 1 & 2

Objective Problems:

1. (B)

2. (A)

3. (B)

4. (B)

5. (D)

6. (B)

7. (A)

8. (C)

9. (C)