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1. Who has stated the Right hand Thumb Rule?

(a) Orsted
(b) Fleming
(c) Einstein
(d) Maxwell

(d) Maxwell

2. Magnetic effect of current was discovered by

(a) Oersted
(c) Bohr
(d) Ampere

(a) Oersted

Explanation:

Oersted showed that electricity and magnetism were related phenomena.

3. Inside the magnet, the field lines moves

(a) from north to south
(b) from south to north
(c) away from south pole
(d) away from north pole

(b) from south to north

Explanation:

Magnetic field inside the magnet moves from south to north pole.

4. Which of the following statement is not correct about the magnetic field?

(a) Magnetic field lines form a continuous closed curve.
(b) Magnetic field line do not interest each other.
(c) Direction of tangent at any point on the magnetic field line curve gives the direction of magnetic field at that point.
(d) Outside the magnet, magnetic field lines go from South to North pole of the magnet.

(d) Outside the magnet, magnetic field lines go from South to North pole of the magnet.

Explanation:

Outside the magnet, magnetic field line emerges from North-pole and moves towards south-pole.

5. The nature of magnetic field line passing through the centre of current carrying circular loop is

(a) circular
(b) ellipse
(c) parabolic
(d) straight line

(d) straight line

Explanation:

magnetic field line at the centre of current carrying loop appears as a straight line.

6. What should be the core of an electromagnet?

(a) soft iron
(b) hard iron
(c) rusted iron
(d) none of above

(a) soft iron

7. The strength of magnetic field inside a long current carrying straight solenoid is

(a) more at the ends than at the centre
(b) minimum in the middle
(c) same at all points
(d) found to increase from one end to the other

(c) same at all points

8. The most important safety method used for protecting home appliances from short circuiting or overloading is by

(a) earthing
(b) use of fuse
(c) use of stabilizers
(d) use of electric meter.

(b) use of fuse

9. Select the incorrect statement

(а) Magnetic field lines are closed curves
(b) No two field lines can cross each other
(c) Field lines can cross each other
(d) The relative strength of the magnetic field is shown by degree of closness of the field lines.

(c) Field lines can cross each other

10. Magnetic field lines around a straight conductor forms a pattern of

(a) concentric circles
(b) concentric ellipse
(c) straight line
(d) square shape.

(a) concentric circles

11. Electric motor is a device which converts

(a) mechanical energy to electrical energy
(b) electrical energy to mechanical energy
(c) chemical energy to mechanical energy
(d) mechanical energy to light energy.

(b) electrical energy to mechanical energy

12. The direction of induced current is given by

(a) Fleming’s right hand rule
(b) Fleming’s left hand rule
(c) Right hand thumb rule
(d) Left hand thumb rule.

(a) Fleming’s right hand rule

13. Unit of intensity of magnetic field is:

(a) Tesla
(b) Ohm
(c) Ampere
(d) Volt-ampere

(a) Tesla

14. A current carrying conductor is placed in between the poles of the stable magnetic field. The direction of force acting on the conductor is given by the law:

(a) Maxwell’s Cark-screw rule
(b) Fleming’s Right hand rule
(c) Fleming’s left hand rule
(d) Ohm’s law.

(c) Fleming’s left hand rule

15. In electric motor, to make the coil rotating continuously in the same direction, current is reversed in the coil after every half rotation by a device called

(a) carbon brush
(b) commutator
(c) slip ring
(d) armature

(b) commutator

Explanation:

A device that reverses the direction of current in the arms of armature through a circuit is called commutation.

16. Earth wire carries

(a) current
(b) voltage
(c) no current
(d) heat

(c) no current

17. The insulation colour of earth wire is

(a) blue
(b) red
(c) green
(d) white.

(c) green

18. The magnitude of induced e.m.f. is:

(a) proportional to the rate of change of field lines
(b) proportional to earth’s magnetic field
(c) depend on material of coil
(d) inversely proportional to the rate of change of speed of magnet.

(a) proportional to the rate of change of field lines

19. Lenz’s law is based on which conservation law:

(a) charge
(b) mass
(c) momentum
(d) energy

(d) energy

20. Dynamo converts:

(a) chemical energy into electric energy
(b) sound energy into magnetic energy
(c) mechanical energy into electric energy
(d) mechanical energy into light energy.