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Class 7 Science Chapter 10 Electric Current And Its Effects Quiz 14 (60 MCQs)

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1. Electric current that flows in only one direction.
2. Rajan made an electromagnet by winding 50 turns of the wire over an iron screw. Priya also made an electromagnet by winding 100 turns of the wire over an iron screw. which electromagnet will attract more pins?
3. If current is passed in a spring with a weight hung on it, then the spring
4. The front face of a circular coil carrying current behaves like a North pole. The direction of current in the face of the circular coil is:
5. A circuit consists of a 12 V battery connected across a single resistor. If the current in the circuit is 3 A, calculate the size of the resistor.
6. Electric cell has
7. Resistance is .....
8. What is the SI unit of magnetic field strength?
9. Which of these will conduct electricity
10. Approximate the instantaneous current of the function at x =-1. $q\left(x\right)=3x^2+2x-1$
11. '+' is the ..... sign whereas '-' is the ..... sign.
12. The filament of A bulb, is a wire of
13. We describe the flow of electricity as being:
14. *While performing a activity on electromagnet, it is observed that when the electric current is switched off, the nail looses its magnetism. Is this statement true or false?
15. Electric Potential ..... as distance increases
16. Which of the following is the best example of an electrical conductor?
17. The switch that automatically stops the current in a circuit if the current exceeds the specified limit, is knows as
18. The movement of deep, cold, nutrient filled water to the surface of the ocean is .....
19. A magnetic field line is used to find the direction of:
20. Which of the following statements is correct about conductor and insulator?
21. Two organisms are good friends and live together. One provides shelter, water, and nutrients while the other prepares and provides food. Such an association of organisms is termed as
22. Current rating of a fuse wire in a circuit having bulb and tubes is:
23. What is the region of force around a magnet known as?
24. Electric current can flow through a wire only if it forms a .....
25. The symbol for 1 ..... is A
26. Which of the following liquids conducts the least amount of electricity?
27. Which one has less resistance?
28. If you turn on all of the lights in your house, the electric meter measuring Kilowatt-hours outside your home will read a ..... value than if the lights are off.
29. The filament of the bulb gets heated to a high temperature due to the
30. In the process of electroplating, the positive ion of the ionised solution gets attracted towards
31. Describe the process of corrosion and its impact on metals.
32. The type of energy converted to electrical energy by a photo-voltaic cell is:
33. A current carrying conductor behaves like a magnet
34. Pure or distilled water is a
35. An electric heater of resistance 8 $\Omega$ draws 15 A from the service mains 2 hours. Calculate the rate at which heat is developed in the heater
36. What kind of process don't go when observe the chemical effect of electric current
37. ..... is the opposition of a material to the flow of electric current.
38. Which of the following is not a reason for excessive currents in electrical circuits?
39. STATE WHETHER TRUE OF FALSE It is convenient to represent electric components by symbols.
40. If the filament of one bulb fuses, rest of the circuit still remains operational. (Identify the circuit)
41. The cyclotron frequency of an electron gyrating in a magnetic field of 1 T is:
42. What is the voltage of a circuit with 4 ohms of resistance and 3 amps of current?
43. Consider The Following Statements And Choose The Correct One:
44. A conductor is any material which ..... electricity to pass through it
45. The essential difference between an A.C. generator and a D.C. generator is that:
46. While trying to put out fire in an electrical appliance, we should
47. In making a battery:
48. Electromagnetism is a magnetism produced by an electric current.
49. Surface Ocean currents are primarily caused by
50. Which of the following are applications of electroplating?
51. Electric fuse is made of material of:
52. What is current?
53. What are some methods to prevent corrosion?
54. Small amount of mineral salts present naturally in water are beneficial for human health.
55. To have a complete electric circuit, the path must be .....
56. Which of the following materials is commonly used to make permanent magnets?
57. A set of electric trains are powered by a 9V battery. What is the resistance of the trains if they draw 3.0 A of current?
58. ..... is a safety device which works on heating effect of electric current.
59. Assertion:Electric Motor converts Electric Energy into mechanical Energy. Reason:Electric motor is based on the principle of Flemings right-hand rule.
60. The object to be electroplated is taken as ..... electrode.
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