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Class 7 Science Chapter 10 Electric Current And Its Effects Quiz 3 (60 MCQs)

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1. Current is measured in ..... using a ..... placed in ..... in a circuit.
2. The Positive Terminal is connected to the ..... Terminal & Negative Terminal is connected to ..... Terminal in a battery
3. What is open circuit
4. Iron is used in bridges and automobiles to provide strength, however, iron tends to corrode and rust, so a coating of ..... is deposited on iron to protect it from corrosion and formation of rust.
5. During electroplating, why should the salt solution be the same metal as the metal to be coated?
6. How much work is done in moving a charge of 2 Coulomb across two points having a potential difference of 12 Volt
7. The strength of the magnetic field is directly proportional to magnitude of electric current
8. When the switch is in the 'ON' position, the electric circuit is said to be
9. Electrical energy is created by the conversion of other forms of energy.
10. What are some common methods used for corrosion prevention?
11. Organisms such as ..... , ..... , and ..... rely on ocean currents for transportation.
12. Which of the following is an application of electroplating.
13. Copper wires are used as connecting wires because
14. An eletric cell has ..... terminals
15. Electromagnets could be used in particular devices
16. Most cores are made of .....
17. In a stereo amplifier circuit, there is a resistor across which you measure 25V, and your ammeter indicates 50mA of current through the resistor. What is the resistor's value in kilohms? In ohms?
18. The energy transferred per unit charge is called
19. What is an electromagnet?
20. Which scientist suggested that the magnet must also exert an equal and opposite force on the current?
21. The magnetic field lines along a straight current carrying conductor.
22. When current flows through a conducting solution than the electrode connected to the negative terminal of the battery is called:
23. An object becomes postiively charged when which of the following occurs?
24. Electric bell has
25. Substances through which electric charges flow easily are called
26. When the electric current passes through fuse exceeds a certain limit, the fuse wire melts and breaks
27. ..... causes the Coriolis Effect
28. The amount of charge that flows through a component in 5 minutes is 600 C. What is the current through the component?
29. Sugar solution is a good conductor of electricity
30. Which of the following characteristics of electrons determines the current in a conductor?
31. Force per unit length is called .....
32. Electric Bell works on the principle of-
33. Which of the following appliances does not use an electromagnet?
34. A fuse wire is made up of alloy
35. The electrode that contains the item to be electroplated
36. ..... was the first person who noticed the deflection of compass needle every time the current was passed through the wire.
37. Does the compass needle show deflection of tap water
38. The electrode connected to the positive terminal of the battery is called
39. Electrical energy is converted to ..... energy in a hair dryer.
40. Smaller bodies of salt water are called
41. Current is expressd in Ampere .....
42. What are electrons in electric circuit
43. Good insulators are ..... resistors
44. Will distilled water conduct electricity?
45. Tungsten is used for the manufacture of an electric bulb because
46. When the strength of the current flowing through a coil is increased, which of the following statements is true for it?
47. The passage of an electric current through a conducting solution causes .....
48. Which part of the electric bell gets attracted towards the electromagnet
49. The longer thinner line in the symbol of a cell denotes
50. What word best fits this definition:A device which converts electrical energy into mechanical energy usually through the rotation of an electromagnet in the field of a stationary magnet.
51. The phenomenon of decomposition of an electrolyte when electricity is passed through is known as
52. Current can produce magnetic field
53. Define electric current.
54. North pole is also called North Seeking Pole.
55. When a current flows into a wire, such as a wire that connects a battery to a light, the wire stays electrically .....
56. Magnetic force and gravitational force are examples of .....
57. The movement of electrons from atom to atom in a closed wire results in a flow of .....
58. When electricity flows through heating coil it becomes ..... hot and gives out ..... energy, which is to put in practical use.
59. Assertion:It is preferable to classify materials as good conductors and poor conductors instead of classifying as conductors and insulators.Reason:Under certain conditions most of the materials conduct electricity.
60. Melt down limit of a fuse wire does not depend on:
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