Punjab 10th Class Physics Chapter 6 Electromagnetism Mcqs Test Online

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Question 1 of 20

Physics

1. 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.Decreases

3.Increases

4.Will be zero

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 slip rings

2.The commutator

3.The brushes

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.Direction of voltage

2.Flow of current

3.South pole

4.North pole

Question 3 of 20

Question 4 of 20

4. 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 4 of 20

Question 5 of 20

5. 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 5 of 20

Question 6 of 20

6. Who discovered electromagnetic induction?

1.Ohm

2.Maxwell

3.Michael Faraday

4.Volta

Question 6 of 20

Question 7 of 20

7. 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 7 of 20

Question 8 of 20

8. 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

2.30 volts

3.45 volts

4.0 volts

Question 8 of 20

Question 9 of 20

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

1.Small mass

2.Magnetic compass

3.Stationary positive charge

4.Stationary negative charge

Question 9 of 20

Question 10 of 20

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

1.Positive

2.Negative

3.Maximum

4.Zero

Question 10 of 20

Question 11 of 20

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

1.Mechanical energy

2.Potential energy

3.Sound energy

4.Kinetic energy

Question 11 of 20

Question 12 of 20

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

1.Is = 10 Ip

2.Ns = 10 Np

3.Ns = Np / 10

4.Vx = Vv/10

Question 12 of 20

Question 13 of 20

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

1.Es

2.Ep

3.Np

4.Ns

Question 13 of 20

Question 14 of 20

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

1.Charge

2.Energy

3.Mass

4.Momentum

Question 14 of 20

Question 15 of 20

15. 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 15 of 20

Question 16 of 20

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

1.There are no magnetic field lines

2.From south pole to north pole

3.From side to side

4.From north pole to south pole

Question 16 of 20

Question 17 of 20

17. 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 17 of 20

Question 18 of 20

18. Which statement is not correct?

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

2.A solenoid cannot be connected with a galvanometer

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

4.Battery contains chemical energy in it

Question 18 of 20

Question 19 of 20

19. 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.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 19 of 20

Question 20 of 20

20. 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 20 of 20

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