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Class 7 Science Chapter 10 Electric Current And Its Effects Quiz 11 (60 MCQs)

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1. The heating coils/elements of different electrical appliances are usually made from ..... or ..... wires. 1. Copper 2. Aluminum 3. Nichrome 4. Tungsten
2. Which sea creature can produce significant amounts of electricity?
3. Warm ocean currents generally come from
4. If two charges repel each other, the two charges must be
5. As current flows through a wire, the number of ..... stays the same
6. ..... is the source of heat energy.
7. It is important to use electrical appliances with ..... marks on it.
8. Distilled water becomes a good conductor of electricity on dissolving
9. Cations are negatively charged ions.
10. When does the filament of a bulb give off light
11. In a conducting liquid electricity is conducted with the help of:
12. Electricity and magnetism are connected to each other. Electricity can produce magnetism. When an electric current flows through a wire, the current creates a very small magnetic field.
13. How many volts would we need to produce a current flow of 8 A through a 6 $\Omega$ resistor
14. In an experiment, a student wraps a copper wire around a nail and connects it to a battery. What is the student likely trying to demonstrate?
15. The plane of the loop is perpendicular to the magnetic field the torque on the current loop is .....
16. Electrolyte that ionise completely to form free mobile ions in the solution is known as
17. What is the purpose of using a sacrificial anode in corrosion prevention?
18. Which among the following is the diadvantage of heating effect of current?
19. In case of thunderstorms, we use ..... to protect appliances.
20. Explain the concept of electroplating.
21. Thin metal wire inside the electric bulb
22. Which of these is plated on the iron to prevent it from chemically reacting with food?
23. Electroplating is a process whereby a metal surface is coated with a non-metal.
24. What is the amount of current flowing through an electric press, if the amount of charge passing through a conductor in 10 minutes is 300 $^{0 }$C?
25. Which among the following are the advantages of heating effect of current?
26. The device used for producing electric current is called a:
27. The greater the resistance offered by the wire to the flow of current, the ..... would be the heat generated.
28. The amount of matter in a given volume
29. In a non-uniform magnetic field the field lines are:
30. Though we specify the direction of direct current by putting an arrow, why is it not considered a vector quantity?
31. Name the effect that causes a coil of current-carrying wire in an electric motor to move.
32. Discharge lamps such as fluorescent lamps, are filled with:
33. Which word best fits this definition:The rotating part of a motor.
34. The method of purification of metals by using electricity is known as
35. Electricians wear rubber gloves because it is
36. Which type of electricity moves along a pathway to make a light turn on?
37. Two types of ocean currents are
38. The direction of electric current in a solenoid when seen from a particular end is clockwise, then this end of the solenoid will be:
39. What unit do we measure charge in?
40. A device for making or breaking an electric circuit.
41. Choose the incorrect statements from the following regarding magnetic lines of field.
42. A current carrying conductor is held in exactly vertical direction. In order to produce a clockwise magnetic field around the conductor, the current should be passed in the conductor:
43. The Coriolis Effect is caused by
44. What is formed when a wire in an electric circuit is wrapped around an iron core producing a magnetic field?
45. Which of the following is caused by static electricity?
46. What unit is used to measure resistance?
47. While making fruit cell zinc strip acts as a-
48. Which mark is necessary on an electric appliance in India:
49. Which best briefly summarizes the law of electric charges?
50. Moving coil galvanometer is used to find the ..... in the circuit.
51. What would increase the strength of an electromagnet?
52. Can electric current flow through thermocol(TRUE/FALSE )
53. What are the two ends of a battery called?
54. The circuit found in household appliances. (Identify the circuit)
55. In the U.S most electrical outlets supply a voltage of .....
56. The North-South polarities of an electromagnet can be determined easily by using:
57. What happens when a rubber rod is rubbed with a piece of fur, giving the rod a negative charge?
58. What characteristics impact resistance of a material?
59. Small amount of a mineral salt present naturally in water makes it a ..... of electricity.
60. In North America, many species of birds fly south during the winter to live in warmer temperatures. These birds have an internal compass that allows them to navigate to their winter homes. The inner compass of a bird is aligned with the ..... to help them navigate.
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