VARDAAN LEARNING INSTITUTE

1. Who discovered the magnetic effect of current? (a) Faraday (b) Oersted (c) Ampere (d) Maxwell
2. The magnetic field lines inside a current carrying solenoid are: (a) Curved (b) Circular (c) Parallel and Straight (d) Irregular
3. The direction of magnetic field produced by a straight current carrying conductor is given by: (a) Maxwell's Right Hand Thumb Rule (b) Fleming's Left Hand Rule (c) Fleming's Right Hand Rule (d) Ohms Law
4. The unit of magnetic field strength is: (a) Joule (b) Tesla (c) Watt (d) Volt
5. A device that converts electrical energy into mechanical energy is: (a) Generator (b) Motor (c) Galvanometer (d) Ammeter
6. The phenomenon of electromagnetic induction was discovered by: (a) Oersted (b) Faraday (c) Newton (d) Bohr
7. Which of the following serves as the core of an electromagnet? (a) Steel (b) Soft Iron (c) Copper (d) Aluminum
8. In domestic circuits, the color of the insulation of the live wire is: (a) Black (b) Green (c) Red (d) Yellow
9. The frequency of AC supply in India is: (a) 45 Hz (b) 50 Hz (c) 60 Hz (d) 100 Hz
10. A fuse is always connected in _______ wire. (a) Live (b) Neutral (c) Earth (d) Any of these
11. The magnetic field is strongest at: (a) Middle of magnet (b) Poles (c) Nowhere (d) Everywhere same
12. Overloading happens when: (a) Live and Neutral wire touch (b) Too many appliances connected to a single socket (c) Voltage drops (d) Circuit is open
13. Short circuiting occurs when: (a) Insulation is damaged (b) Live touches Neutral (c) Current increases abruptly (d) All of these
14. The potential of earth wire is: (a) 220V (b) 110V (c) 0V (d) Fluctuating
15. AC generator works on the principle of: (a) Force on conductor (b) Electromagnetic Induction (c) Heating effect (d) Chemical effect
16. Commutator is used in: (a) AC Generator (b) DC Motor (c) Transformer (d) Inductor
17. To increase the strength of an electromagnet, we can: (a) Increase current (b) Increase number of turns (c) Use soft iron core (d) All of these
18. 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) Screw Rule
19. Magnetic field lines: (a) Intersect at 90 degrees (b) Intersect at 45 degrees (c) Never intersect (d) Merge at poles
20. An electric fuse works on the: (a) Chemical effect of current (b) Magnetic effect of current (c) Lighting effect of current (d) Heating effect of current

21. A magnet attracts materials like _______, Cobalt and Nickel.
22. Like magnetic poles _______ each other.
23. Unlike magnetic poles _______ each other.
24. Magnetic field lines emerge from the _______ pole outside the magnet.
25. Inside a magnet, field lines go from _______ to _______ pole.
26. A current carrying straight wire produces a field in the form of _______ circles.
27. A coil of many turns of wire wrapped in shape of cylinder is called a _______.
28. The device used to test the presence of small current is _______.
29. Current that changes direction periodically is called _______ current.
30. Current that flows in one direction only is called _______ current.
31. The safe limit of current for domestic line is mainly _______ A and 15 A.
32. _______ wire is used to protect user from electric shock.
33. Kilowatt-hour is the unit of _______.
34. Magnetic field is a quantity that has both magnitude and _______.
35. Two magnetic field lines never _______ each other.
36. The pattern of magnetic field around a straight conductor can be traced using a _______.
37. In a battery, the longer line represents the _______ terminal.
38. The strength of magnetic field produced by a solenoid is directly proportional to the _______.
39. Soft iron is a _______ magnetic material.
40. Hard steel is used to make _______ magnets.

41. Magnetic field lines are closed curves.
42. A compass needle is a small bar magnet.
43. No force acts on a stationary charge in a magnetic field.
44. A current carrying solenoid behaves like a bar magnet.
45. Fleming's Left Hand Rule gives the direction of induced current.
46. An electric motor converts mechanical energy into electrical energy.
47. Copper is a magnetic material.
48. Earth's magnetic field resembles that of a bar magnet.
49. A fuse wire has a high melting point.
50. Parallel connection is used in domestic wiring.
51. The potential difference between live and neutral wire is 220V.
52. Green insulation is used for the live wire.
53. A freely suspended magnet always points in East-West direction.
54. Monopoles (isolated poles) can exist.
55. Magnetic field lines are crowded where the field is strong.
56. Oersted discovered the heating effect of current.
57. Electric generator is based on electromagnetic induction.
58. Force on a current carrying conductor is maximum when it is parallel to the magnetic field.
59. MCBs are used as a safety device in place of fuses.
60. AC can be transmitted over long distances with less energy loss.

Set 1: Discoveries & Rules

Set 2: Devices & Functions

Set 3: Wires & Colors (Old/New Convention mixed)

Set 4: Materials & Properties

81. Name the instrument used to find the direction of magnetic field.
82. What is the angle between magnetic field and current for maximum force?
83. What is the angle between magnetic field and current for zero force?
84. Name the device which reverses the direction of current in a motor.
85. Which rule gives the direction of magnetic field due to a loop?
86. What prevents electric shock when touching a metallic appliance?
87. Does a stationary charge experience force in a magnetic field?
88. What is the nature of magnetic field lines inside a solenoid?
89. State the polarity of the face of the loop carrying clockwise current.
90. State the polarity of the face of the loop carrying anti-clockwise current.
91. Which physical quantity is represented by the degree of closeness of field lines?
92. Name the type of current supplied by a battery.
93. Name the type of current supplied to our houses.
94. What happens to the field if current in a wire is doubled?
95. What happens to the field if distance from the wire is doubled?
96. Who gave the law of heating effect? (Related to Fuse).
97. Name a natural magnet.
98. What is the full form of MCB?
99. What type of magnetic field is produced by the earth?
100. Can we separate the poles of a magnet?