Punjab 10th Class Physics Chapter 6 Electromagnetism Mcqs Test Online

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Question 1 of 20

Physics

1. The step-up transformer:

1.Increases the input voltage

2.Increases the input current

3.Has less turns in the secondary coil

4.Has more turns in the primary

Question 1 of 20

Question 2 of 20

2. Who discovered electromagnetic induction?

1.Volta

2.Ohm

3.Michael Faraday

4.Maxwell

Question 2 of 20

Question 3 of 20

3. 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 3 of 20

Question 4 of 20

4. Select the statement which is not true:

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

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

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

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

Question 4 of 20

Question 5 of 20

5. Which statement is true about the magnetic poles?

1.Magnetic poles do not effect each other

2.Like poles attract

3.A single magnetic poles does not exist

4.Unlike poles repel

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.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 6 of 20

Question 7 of 20

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

1.Magnetic compass

2.Small mass

3.Stationary positive charge

4.Stationary negative charge

Question 7 of 20

Question 8 of 20

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

1.Ep

2.Es

3.Np

4.Ns

Question 8 of 20

Question 9 of 20

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

1.Positive

2.Zero

3.Maximum

4.Negative

Question 9 of 20

Question 10 of 20

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

1.South pole

2.Direction of voltage

3.North pole

4.Flow of current

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 armature

2.The brushes

3.The slip rings

4.The commutator

Question 11 of 20

Question 12 of 20

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

1.Elliptical

2.Triangular

3.Rectangular

4.Circular

Question 12 of 20

Question 13 of 20

13. 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 13 of 20

Question 14 of 20

14. 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.There are no magnetic field lines

4.From north pole to south pole

Question 14 of 20

Question 15 of 20

15. A D.C. motor converts:

1.Mechanical energy into chemical energy

2.Electrical energy into mechanical energy

3.Electrical energy into chemical energy

4.Mechanical energy into electrical energy

Question 15 of 20

Question 16 of 20

16. Which statement is not correct?

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

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

3.Battery contains chemical energy in it

4.A solenoid cannot be connected with a galvanometer

Question 16 of 20

Question 17 of 20

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

1.Potential energy

2.Mechanical energy

3.Sound energy

4.Kinetic energy

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.Will be zero

2.Increases

3.Remains the same

4.Decreases

Question 18 of 20

Question 19 of 20

19. 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:

1.45 volts

2.0 volts

3.30 volts

4.60 volts

Question 19 of 20

Question 20 of 20

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

1.The middle finger points in the direction of current

2.The forefinger points in the direction of magnetic field

3.The thumb indicates the direction of current

4.The thumb indicates the direction of force

Question 20 of 20

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