Punjab 10th Class Physics Chapter 6 Electromagnetism Mcqs Test Online

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Question 1 of 20

Physics

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

1.The brushes

2.The armature

3.The commutator

4.The slip rings

Question 1 of 20

Question 2 of 20

2. The step-up transformer:

1.Increases the input current

2.Increases the input voltage

3.Has less turns in the secondary coil

4.Has more turns in the primary

Question 2 of 20

Question 3 of 20

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

1.From south pole to north pole

2.From north pole to south pole

3.From side to side

4.There are no magnetic field lines

Question 3 of 20

Question 4 of 20

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

1.The thumb indicates the direction of force

2.The thumb indicates the direction of current

3.The middle finger points in the direction of current

4.The forefinger points in the direction of magnetic field

Question 4 of 20

Question 5 of 20

5. Who discovered electromagnetic induction?

1.Michael Faraday

2.Maxwell

3.Ohm

4.Volta

Question 5 of 20

Question 6 of 20

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

1.Mass

2.Charge

3.Energy

4.Momentum

Question 6 of 20

Question 7 of 20

7. 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.The same as the direction of field

2.Opposite to the direction of the field

3.Makes an angle of 45° with the current

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

Question 7 of 20

Question 8 of 20

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

1.North pole

2.Direction of voltage

3.South pole

4.Flow of current

Question 8 of 20

Question 9 of 20

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

1.Elliptical

2.Triangular

3.Circular

4.Rectangular

Question 9 of 20

Question 10 of 20

10. Which statement is not correct?

1.Battery contains chemical energy in it

2.A solenoid cannot be connected with a galvanometer

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

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

Question 10 of 20

Question 11 of 20

11. 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:

1.0 volts

2.45 volts

3.60 volts

4.30 volts

Question 11 of 20

Question 12 of 20

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

1.Sound energy

2.Kinetic energy

3.Potential energy

4.Mechanical energy

Question 12 of 20

Question 13 of 20

13. Select the statement which is not true:

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

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

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

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

Question 13 of 20

Question 14 of 20

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

1.Ns

2.Np

3.Es

4.Ep

Question 14 of 20

Question 15 of 20

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

1.Magnetic compass

2.Small mass

3.Stationary negative charge

4.Stationary positive charge

Question 15 of 20

Question 16 of 20

16. A D.C. motor converts:

1.Electrical energy into chemical energy

2.Mechanical energy into electrical energy

3.Electrical energy into mechanical energy

4.Mechanical energy into chemical energy

Question 16 of 20

Question 17 of 20

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

1.Positive

2.Maximum

3.Negative

4.Zero

Question 17 of 20

Question 18 of 20

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

1.Decreases

2.Will be zero

3.Remains the same

4.Increases

Question 18 of 20

Question 19 of 20

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

1.Vx = Vv/10

2.Ns = Np / 10

3.Ns = 10 Np

4.Is = 10 Ip

Question 19 of 20

Question 20 of 20

20. Which statement is true about the magnetic poles?

1.Magnetic poles do not effect each other

2.Unlike poles repel

3.Like poles attract

4.A single magnetic poles does not exist

Question 20 of 20

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