Punjab 10th Class Physics Chapter 6 Electromagnetism Mcqs Test Online

Question 1 of 20

Physics

1. 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.A solenoid cannot be connected with a galvanometer

4.Battery contains chemical energy in it

Question 1 of 20

Question 2 of 20

2. The step-up transformer:

1.Increases the input current

2.Has less turns in the secondary coil

3.Increases the input voltage

4.Has more turns in the primary

Question 2 of 20

Question 3 of 20

3. A D.C. motor converts:

1.Mechanical energy into chemical energy

2.Mechanical energy into electrical energy

3.Electrical energy into mechanical energy

4.Electrical energy into chemical energy

Question 3 of 20

Question 4 of 20

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

1.Ns = 10 Np

2.Vx = Vv/10

3.Ns = Np / 10

4.Is = 10 Ip

Question 4 of 20

Question 5 of 20

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

1.Magnetic compass

2.Stationary positive charge

3.Small mass

4.Stationary negative charge

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.Makes an angle of 45° with the current

2.Opposite to the direction of the field

3.The same as the direction of field

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

Question 6 of 20

Question 7 of 20

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

1.Mass

2.Charge

3.Momentum

4.Energy

Question 7 of 20

Question 8 of 20

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

1.There are no magnetic field lines

2.From side to side

3.From north pole to south pole

4.From south pole to north pole

Question 8 of 20

Question 9 of 20

9. 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 9 of 20

Question 10 of 20

10. 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 10 of 20

Question 11 of 20

11. 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:

1.0 volts

2.45 volts

3.60 volts

4.30 volts

Question 11 of 20

Question 12 of 20

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

1.Positive

2.Negative

3.Maximum

4.Zero

Question 12 of 20

Question 13 of 20

13. Which statement is true about the magnetic poles?

1.A single magnetic poles does not exist

2.Unlike poles repel

3.Like poles attract

4.Magnetic poles do not effect each other

Question 13 of 20

Question 14 of 20

14. Who discovered electromagnetic induction?

1.Maxwell

2.Michael Faraday

3.Volta

4.Ohm

Question 14 of 20

Question 15 of 20

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

1.South pole

2.North pole

3.Direction of voltage

4.Flow of current

Question 15 of 20

Question 16 of 20

16. Select the statement which is not true:

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

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

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 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. Which indicates the number of turns in primary coil?

1.Ns

2.Es

3.Ep

4.Np

Question 18 of 20

Question 19 of 20

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

1.Increases

2.Will be zero

3.Remains the same

4.Decreases

Question 19 of 20

Question 20 of 20

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

1.Elliptical

2.Rectangular

3.Triangular

4.Circular

Question 20 of 20

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