Punjab 10th Class Physics Chapter 6 Electromagnetism Mcqs Test Online

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Question 1 of 20

Physics

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

1.The forefinger points in the direction of magnetic field

2.The middle finger points in the direction of current

3.The thumb indicates the direction of current

4.The thumb indicates the direction of force

Question 1 of 20

Question 2 of 20

2. Who discovered electromagnetic induction?

1.Maxwell

2.Ohm

3.Volta

4.Michael Faraday

Question 2 of 20

Question 3 of 20

3. 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

2.0 volts

3.45 volts

4.60 volts

Question 3 of 20

Question 4 of 20

4. 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 4 of 20

Question 5 of 20

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

1.Remains the same

2.Increases

3.Will be zero

4.Decreases

Question 5 of 20

Question 6 of 20

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

1.Es

2.Ep

3.Np

4.Ns

Question 6 of 20

Question 7 of 20

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

1.Ns = 10 Np

2.Ns = Np / 10

3.Is = 10 Ip

4.Vx = Vv/10

Question 7 of 20

Question 8 of 20

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

1.Zero

2.Negative

3.Maximum

4.Positive

Question 8 of 20

Question 9 of 20

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

1.Charge

2.Mass

3.Energy

4.Momentum

Question 9 of 20

Question 10 of 20

10. Which statement is not correct?

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

2.A solenoid cannot be connected with a galvanometer

3.Battery contains chemical energy in it

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

Question 10 of 20

Question 11 of 20

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

1.The slip rings

2.The armature

3.The brushes

4.The commutator

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. The step-up transformer:

1.Has more turns in the primary

2.Increases the input voltage

3.Increases the input current

4.Has less turns in the secondary coil

Question 13 of 20

Question 14 of 20

14. 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 14 of 20

Question 15 of 20

15. 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.The same as the direction of field

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

4.Opposite to the direction of the field

Question 15 of 20

Question 16 of 20

16. A D.C. motor converts:

1.Mechanical energy into electrical energy

2.Electrical energy into chemical energy

3.Mechanical energy into chemical energy

4.Electrical energy into mechanical energy

Question 16 of 20

Question 17 of 20

17. Which statement is true about the magnetic poles?

1.Unlike poles repel

2.A single magnetic poles does not exist

3.Like poles attract

4.Magnetic poles do not effect each other

Question 17 of 20

Question 18 of 20

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

1.From side to side

2.There are no magnetic field lines

3.From north pole to south pole

4.From south pole to north pole

Question 18 of 20

Question 19 of 20

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

1.Direction of voltage

2.South pole

3.Flow of current

4.North pole

Question 19 of 20

Question 20 of 20

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

1.Circular

2.Rectangular

3.Elliptical

4.Triangular

Question 20 of 20

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