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Class 7 Science Chapter 10 Electric Current And Its Effects Quiz 7 (60 MCQs)

Quiz Instructions

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1. ..... is an example for temporary magnet
2. A ..... is a safety device which prevents damages to electrical circuits and possible fires.
3. What device makes a fan plugged into the wall spin?
4. The force on a conductor carrying current in a magnetic field is kept perpendicular to the field. The force acting on it will be:
5. The substances which have very low ignition temperature will
6. Current rating of a fuse wire in a circuit having heating appliances is:
7. The two types of current are .....
8. ..... north pole of the earth is located near the geographic south pole
9. When a switch is in OFF position:(i) circuit starting from the positive terminal of the cell stops at the switch.(ii) circuit is open.(iii) no current flows through it.(iv) current flows after some time.Choose the combination of correct answer from the following:
10. Connection of more than one device/ appliance to a single socket is called-part of g.k
11. The LED that produces light from current flow is a:
12. A common household device, that do not use an electromagnet in its working, is-
13. For measurement of potential difference, a potentiometer is preferred over voltmeter because
14. Which of the following statements regarding an electromagnet is not true?
15. A glowing bulb becomes warm due to the:-
16. Tick the chemical effect of elecric current
17. Our body is a ..... of electricity?
18. If too much electric current passes through a circuit, the wires can
19. In current electricity, charges are always on the move.
20. When the electric current through the fuse exceeds a certain limit, the fuse wire melts and breaks.
21. One advantage for physiological effects of electric current
22. Who ultimately succeeded in making the first bulb
23. Acids are good conductors of electricity
24. Which rule is used to find the direction of the magnetic field around a current-carrying conductor?
25. To electroplate silver on Copper jewellery, the electrolyte that can be used is:
26. Which works does not work on magnetic effect of current
27. True or False. Electrons move easily.
28. If a current of 2 A passes through a point in 3 s then charge passes thatpoint is
29. On passing electricity through water, oxygen was formed at the .....
30. Electroplating is based on ..... of an electric current.
31. The front face of a circular wire carrying current behaves like a north pole. The direction of current in this face of the circular wire is:
32. Which of the following is a bad conductor of electricity?
33. A device that uses chemical energy to make electricity
34. When the circuit is closed, the electric current does not flow throughout the circuit.
35. In an electric circuit a fuse is a ..... to prevent possible fire.
36. Which of the following liquids are bad conductors?
37. Which of these materials is a conductor?
38. Iron, Nickel and cobalt are all ..... materials
39. Who developed dry cell?
40. We coat iron with zinc
41. Ocean water is more dense than fresh water at the same temperature due to differences in .....
42. Crane has a strong ..... attached to it.
43. Dynamo works on the principle of
44. Turning off an electric light creates a(n) ..... path
45. All of the follow are true EXCEPT
46. The longer lead of LED is always connected to the ..... terminal of the battery.
47. A flash of lightning is an example of an electric .....
48. What happens at the anode during electrolysis?
49. The stationary charges on the surface of a balloon can produce a(n) .....
50. Which of these is an example of current electricity?
51. What is a wire in a circuit wrapped around an iron core called?
52. Which of the following is incorrect about the batteries used in cars, buses and truck?
53. A crystal of NaCl can conduct electricity.
54. When electrodes are immersed in water and electricity passed, the bubbles formed on the positive terminal is actually ..... gas.
55. An electric current flowing in one direction only
56. What is the full form of MCB-
57. The direction of current in the coil at one end of an electromagnet is clockwise. This end of the electromagnet will be:
58. Deep Ocean currents are primarily caused by .....
59. If you were plating with copper, which electrolyte could be used
60. What is the Voltage of a circuit that has a resistance of 5 $\Omega$ and a current of 2 A?
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