Punjab 10th Class Physics Chapter 6 Electromagnetism Mcqs Test Online

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Question 1 of 20

Physics

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

1.Circular

2.Elliptical

3.Rectangular

4.Triangular

Question 1 of 20

Question 2 of 20

2. The step-up transformer:

1.Has less turns in the secondary coil

2.Has more turns in the primary

3.Increases the input voltage

4.Increases the input current

Question 2 of 20

Question 3 of 20

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

1.Decreases

2.Remains the same

3.Will be zero

4.Increases

Question 3 of 20

Question 4 of 20

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

1.The armature

2.The commutator

3.The slip rings

4.The brushes

Question 4 of 20

Question 5 of 20

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

3.A solenoid cannot be connected with a galvanometer

4.Battery contains chemical energy in it

Question 5 of 20

Question 6 of 20

6. Which statement is true about the magnetic poles?

1.Unlike poles repel

2.A single magnetic poles does not exist

3.Magnetic poles do not effect each other

4.Like poles attract

Question 6 of 20

Question 7 of 20

7. 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

2.60 volts

3.45 volts

4.0 volts

Question 7 of 20

Question 8 of 20

8. 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 8 of 20

Question 9 of 20

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

1.Stationary negative charge

2.Stationary positive charge

3.Magnetic compass

4.Small mass

Question 9 of 20

Question 10 of 20

10. Select the statement which is not true:

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

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

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

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

Question 10 of 20

Question 11 of 20

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

1.North pole

2.South pole

3.Flow of current

4.Direction of voltage

Question 11 of 20

Question 12 of 20

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

1.Ns = Np / 10

2.Is = 10 Ip

3.Vx = Vv/10

4.Ns = 10 Np

Question 12 of 20

Question 13 of 20

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

1.Ns

2.Np

3.Es

4.Ep

Question 13 of 20

Question 14 of 20

14. A D.C. motor converts:

1.Electrical energy into mechanical energy

2.Mechanical energy into chemical energy

3.Electrical energy into chemical energy

4.Mechanical energy into electrical energy

Question 14 of 20

Question 15 of 20

15. 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 15 of 20

Question 16 of 20

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

3.Opposite to the direction of the field

4.The same as the direction of field

Question 16 of 20

Question 17 of 20

17. Who discovered electromagnetic induction?

1.Volta

2.Maxwell

3.Ohm

4.Michael Faraday

Question 17 of 20

Question 18 of 20

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

1.Kinetic energy

2.Mechanical energy

3.Sound energy

4.Potential energy

Question 18 of 20

Question 19 of 20

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

1.Negative

2.Zero

3.Positive

4.Maximum

Question 19 of 20

Question 20 of 20

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

1.The thumb indicates the direction of force

2.The middle finger points in the direction of current

3.The forefinger points in the direction of magnetic field

4.The thumb indicates the direction of current

Question 20 of 20

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