Punjab 10th Class Physics Chapter 6 Electromagnetism Mcqs Test Online

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Question 1 of 20

Physics

1. Select the statement which is not true:

1.The value of induced e.m.f is inversely proportional to the rate of change of flux

2.When there is relative motion between the coil and the magnet, induced e.m.f. is produced

3.Change of flux induces an e.m.f. in the coil

4.Michael Faraday discovered Faraday’s law of electromagnetic induction in 1831

Question 1 of 20

Question 2 of 20

2. Which part of a D.C. motor reverses the direction of current through the coil every half-cycle?

1.The brushes

2.The commutator

3.The slip rings

4.The armature

Question 2 of 20

Question 3 of 20

3. If curl of fingers of right hand shows the direction of current in solenoid, then thumb indicates:

1.North pole

2.South pole

3.Flow of current

4.Direction of voltage

Question 3 of 20

Question 4 of 20

4. The presence of a magnetic field can be detected by a:

1.Small mass

2.Stationary negative charge

3.Stationary positive charge

4.Magnetic compass

Question 4 of 20

Question 5 of 20

5. Which statement is not correct?

1.Battery contains chemical energy in it

2.If a coil is placed in the magnetic field of a bar magnet, some lines of force will pass through its face

3.Magnetic lines of force can be drawn in any magnetic field

4.A solenoid cannot be connected with a galvanometer

Question 5 of 20

Question 6 of 20

6. When a straight current carrying conductor is placed in a magnetic field at right angles to it, the direction of force acting upon it is:

1.Makes an angle of 45° with the current

2.Opposite to the direction of the field

3.At right angles to both the field and the current

4.The same as the direction of field

Question 6 of 20

Question 7 of 20

7. If the current in a wire which is placed perpendicular to a magnetic field increases, the force on the wire:

1.Will be zero

2.Increases

3.Decreases

4.Remains the same

Question 7 of 20

Question 8 of 20

8. The direction of induced e.m.f. in a circuit is in accordance with conservation of:

1.Mass

2.Momentum

3.Charge

4.Energy

Question 8 of 20

Question 9 of 20

9. Who discovered electromagnetic induction?

1.Ohm

2.Maxwell

3.Volta

4.Michael Faraday

Question 9 of 20

Question 10 of 20

10. Which indicates the number of turns in primary coil?

1.Ep

2.Ns

3.Es

4.Np

Question 10 of 20

Question 11 of 20

11. The shape of magnetic lines of force in case of a straight current carrying conductor is:

1.Rectangular

2.Circular

3.Elliptical

4.Triangular

Question 11 of 20

Question 12 of 20

12. If a coil moves parallel to magnetic field, the induced e.m.f will be:

1.Negative

2.Maximum

3.Positive

4.Zero

Question 12 of 20

Question 13 of 20

13. The turn ratio of a transformer is 10. It means:

1.Ns = 10 Np

2.Is = 10 Ip

3.Ns = Np / 10

4.Vx = Vv/10

Question 13 of 20

Question 14 of 20

14. Which statement is true about the magnetic poles?

1.Unlike poles repel

2.Like poles attract

3.A single magnetic poles does not exist

4.Magnetic poles do not effect each other

Question 14 of 20

Question 15 of 20

15. The D.C, motor converts, electrical energy of battery into ______________ of the coil.

1.Sound energy

2.Mechanical energy

3.Kinetic energy

4.Potential energy

Question 15 of 20

Question 16 of 20

16. Which is not correct according to Fleming’s left hand rule?

1.The forefinger points in the direction of magnetic field

2.The thumb indicates the direction of force

3.The thumb indicates the direction of current

4.The middle finger points in the direction of current

Question 16 of 20

Question 17 of 20

17. A transformer has 100 turns in the primary and 500 turns in the secondary. If 6 volts is applied across its primary, the voltage induced across its secondary would be:

1.30 volts

2.60 volts

3.45 volts

4.0 volts

Question 17 of 20

Question 18 of 20

18. A D.C. motor converts:

1.Electrical energy into mechanical energy

2.Mechanical energy into electrical energy

3.Mechanical energy into chemical energy

4.Electrical energy into chemical energy

Question 18 of 20

Question 19 of 20

19. What is the direction of the magnetic field lines inside a bar magnet?

1.From side to side

2.From south pole to north pole

3.From north pole to south pole

4.There are no magnetic field lines

Question 19 of 20

Question 20 of 20

20. The step-up transformer:

1.Increases the input current

2.Increases the input voltage

3.Has more turns in the primary

4.Has less turns in the secondary coil

Question 20 of 20

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