The Electromagnetism

01. Name the following: The path along which the unit north pole moves in a magnetic field
02. Magnetic lines of force are
(a) closed, continuous curves
(b) go from North Pole to South pole
(c) tangent gives direction of Magnetic field
(d) do not intersect (cross)
(e) All of the above
03. True or False: If magnetic lines of force are crowded, it means field is Weak
04. True or False: Like poles Attract each other
05. Fill in the Blank: If ________ is passed through a wire, electric field is produced near it.
06. Fill in the Blank: Magnitude of magnetic field is directly proportional to __________
07. Magnitude of magnetic field is _________ to distance from the wire
(a) Inversely proportional
(b) Proportional
(c) Independent of
(d) Directly Proportional
08. ________ showed that electricity and magnetism are related phenomena.
(a) Newton
(b) Fleming
(c) Faraday
(d) Oersted
09. Fill in the Blank: Imagine you are holding a straight conductor carrying current, in your Right hand. If Thumb Points towards direction of current, then Curled fingers gives direction of ________
10. Name the following: A coil of many turns of insulated copper wire wrapped in the shape of cylinder
11. True or False: Field of a Solenoid is similar to that of a bar magnet
12. The alloy used to produce permanent magnets is ____
(a) Nipermag
(b) Brass
(c) Mild Steel
(d) Stainless Steel
13. Alnico is an alloy of _____
(a) Fe, C, Ni
(b) Fe, Ni, Ca
(c) Al, Ni, Co
(d) Cu, Al, Ni
14. Fill in the Blank: Force is exerted on the rod carrying the current when placed in a magnetic field. Force is maximum, when direction of current is ________ to direction of magnetic field
15. Fleming’s Left-Hand Rule is applicable for
(a) Generators
(b) Motors
(c) Transformers
(d) Turbines
16. Name the following: The device for accelerating charged particle to bombard heavy atoms so as to study structure of matter.
17. Fill in the Blank: A device which converts electrical energy into ____________ is called an electric motor.
18. ________ first studied that if a conductor is moving inside a magnetic field or magnetic field is changing around a fixed conductor, electric current is generated.
(a) Alessandro Volta
(b) Michael Faraday
(c) George Simon Ohm
(d) Andre Ampere
19. Fill in the Blank: The process by which a changing magnetic field in a conductor induces a current in another conductor, is called _____
20. Nipermag is an alloy of _____
(a) Sn, Ni, Al, Cu
(b) Au, Ni, Al, Co
(c) Cu, C, Al, Co
(d) Fe, Ni, Al, Ti
21. The induced current is maximum, when direction of motion of coil is_____ to the magnetic field.
(a) Parallel
(b) Diagonal
(c) Perpendicular
(d) at 45°
22. A ______ is an instrument which is used to detect the presence of current in a circuit
(a) Voltmeter
(b) Potentiometer
(c) Transformer
(d) Galvanometer
23. Fleming’s Right-Hand Rule is applicable for
(a) Generators
(b) Motors
(c) Transformers
(d) Turbines
24. Fill in the Blank: A device which converts mechanical energy into ____________ is called an electric generator.
25. ________ works on the principle that a current carrying conductor placed in a magnetic field experiences a force.
(a) Generators
(b) Motors
(c) Transformers
(d) Turbines
26. Find Odd one out:
Armature Coil,
Strong Magnet,
Split Ring Commutator,
Brushes,
Switch
27. True or False: The frequency of DC Current is 50 Hz in India
28. Fill in the Blank: Electric generator works on the principle of _________
29. Find Odd one out:
Fuses,
Insulated gloves,
Wire insulation,
Earthing,
Electric Iron
30. Find Odd one out:
Mixers,
Blenders,
Fans,
Washing machines,
Transformer
Answers:


01. magnetic lines of force or magnetic field lines.
02. (e) All of the above
03. False { That means field is Strong }
04. False { They Repel }
05. electric current
06. electric current
07. (a) Inversely proportional
08. (d) Oersted
09. magnetic field
10. Solenoid
11. True
12. (a) Nipermag
13. (c) Al, Ni, Co
14. perpendicular
15. (b) Motors
16. Cyclotron
17. mechanical energy
18. (b) Michael Faraday
19. Electromagnetic Induction
20. (d) Fe, Ni, Al, Ti
21. (c) Perpendicular
22. (d) Galvanometer
23. (a) Generators
24. electrical energy
25. (b) Motors
26. Switch { Rest are parts of motor }
27. False { AC Current has frequency of 50 Hz }
28. Electromagnetic Induction
29. Electric Iron { Rest are Safety measures in using electricity }
30. Transformer { Rest are applications of motor }