Punjab 10th Class Physics Chapter 6 Electromagnetism Mcqs Test Online

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Question 1 of 20

Physics

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

1.Zero

2.Maximum

3.Positive

4.Negative

Question 1 of 20

Question 2 of 20

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

1.Stationary positive charge

2.Small mass

3.Magnetic compass

4.Stationary negative charge

Question 2 of 20

Question 3 of 20

3. Which statement is true about the magnetic poles?

1.Magnetic poles do not effect each other

2.A single magnetic poles does not exist

3.Like poles attract

4.Unlike poles repel

Question 3 of 20

Question 4 of 20

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

1.Charge

2.Mass

3.Momentum

4.Energy

Question 4 of 20

Question 5 of 20

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

1.Rectangular

2.Elliptical

3.Triangular

4.Circular

Question 5 of 20

Question 6 of 20

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

1.The thumb indicates the direction of current

2.The forefinger points in the direction of magnetic field

3.The middle finger points in the direction of current

4.The thumb indicates the direction of force

Question 6 of 20

Question 7 of 20

7. 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.There are no magnetic field lines

4.From side to side

Question 7 of 20

Question 8 of 20

8. A D.C. motor converts:

1.Electrical energy into mechanical energy

2.Mechanical energy into chemical energy

3.Mechanical energy into electrical energy

4.Electrical energy into chemical energy

Question 8 of 20

Question 9 of 20

9. The step-up transformer:

1.Has more turns in the primary

2.Increases the input current

3.Increases the input voltage

4.Has less turns in the secondary coil

Question 9 of 20

Question 10 of 20

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

2.The same as the direction of field

3.Opposite to the direction of the field

4.Makes an angle of 45° with the current

Question 10 of 20

Question 11 of 20

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

1.Vx = Vv/10

2.Ns = 10 Np

3.Is = 10 Ip

4.Ns = Np / 10

Question 11 of 20

Question 12 of 20

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

1.Increases

2.Remains the same

3.Decreases

4.Will be zero

Question 12 of 20

Question 13 of 20

13. 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:

1.60 volts

2.0 volts

3.30 volts

4.45 volts

Question 13 of 20

Question 14 of 20

14. Which statement is not correct?

1.A solenoid cannot be connected with a galvanometer

2.Battery contains chemical energy in it

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 14 of 20

Question 15 of 20

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

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

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

Question 15 of 20

Question 16 of 20

16. Who discovered electromagnetic induction?

1.Ohm

2.Volta

3.Maxwell

4.Michael Faraday

Question 16 of 20

Question 17 of 20

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

1.Np

2.Ep

3.Es

4.Ns

Question 17 of 20

Question 18 of 20

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

1.Flow of current

2.Direction of voltage

3.North pole

4.South pole

Question 18 of 20

Question 19 of 20

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

1.The slip rings

2.The brushes

3.The commutator

4.The armature

Question 19 of 20

Question 20 of 20

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

1.Mechanical energy

2.Kinetic energy

3.Sound energy

4.Potential energy

Question 20 of 20

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