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.Positive

3.Negative

4.Maximum

Question 1 of 20

Question 2 of 20

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

1.Stationary negative charge

2.Magnetic compass

3.Stationary positive charge

4.Small mass

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. 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.Battery contains chemical energy in it

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

Question 4 of 20

Question 5 of 20

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

1.Potential energy

2.Sound energy

3.Kinetic energy

4.Mechanical energy

Question 5 of 20

Question 6 of 20

6. 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 6 of 20

Question 7 of 20

7. Who discovered electromagnetic induction?

1.Ohm

2.Michael Faraday

3.Volta

4.Maxwell

Question 7 of 20

Question 8 of 20

8. 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.From side to side

4.There are no magnetic field lines

Question 8 of 20

Question 9 of 20

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

1.Rectangular

2.Elliptical

3.Circular

4.Triangular

Question 9 of 20

Question 10 of 20

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

1.Momentum

2.Energy

3.Mass

4.Charge

Question 10 of 20

Question 11 of 20

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

1.The forefinger points in the direction of magnetic field

2.The thumb indicates the direction of current

3.The thumb indicates the direction of force

4.The middle finger points in the direction of current

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.Remains the same

2.Decreases

3.Increases

4.Will be zero

Question 12 of 20

Question 13 of 20

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

1.Vx = Vv/10

2.Ns = Np / 10

3.Ns = 10 Np

4.Is = 10 Ip

Question 13 of 20

Question 14 of 20

14. The step-up transformer:

1.Increases the input voltage

2.Increases the input current

3.Has more turns in the primary

4.Has less turns in the secondary coil

Question 14 of 20

Question 15 of 20

15. 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

3.0 volts

4.45 volts

Question 15 of 20

Question 16 of 20

16. A D.C. motor converts:

1.Electrical energy into chemical energy

2.Electrical energy into mechanical energy

3.Mechanical energy into chemical energy

4.Mechanical energy into electrical energy

Question 16 of 20

Question 17 of 20

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

1.The commutator

2.The armature

3.The slip rings

4.The brushes

Question 17 of 20

Question 18 of 20

18. 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.Opposite to the direction of the field

2.Makes an angle of 45° with the current

3.The same as the direction of field

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

Question 18 of 20

Question 19 of 20

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

1.Ep

2.Ns

3.Es

4.Np

Question 19 of 20

Question 20 of 20

20. 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 20 of 20

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