1 mark questions
1. What is electricity?
2. What is electric current? Write its unit.
3. What is D.C?
4. What is a transformer?
5. Define step-up transformer.
6. Which principle is dynamo based on?
7. What is filament? Which material is used as filament?
8. What is the magnetic effect of current electricity?
9. What is mean by heating effect of the electricity?
10. What is full form of CFL and EMF?
11. What is a fuse?
12. Name the material used as a fuse.
13. What do you mean by kilowatt-hour?
14. What is electromagnetic induction?
15. State Faraday's laws of electromagnetic induction.
16. What is motor effect?
17. What is an electromagnet?
18. What is electromagnetic induction? Write its uses.
19. Write down the type of transformer in which turnings of wire in the secondary
coil is less than that of the primary coil.
20. Which coil has greater number of winding in a step-up transformer?
21. What is electroplating?
22. What is electrolysis of water?
23. What do you mean by short circuit?
24. What is inverter?
25. Why is inverter used?
26. What type of metal is used for heating element?
27. Write one example of each instrument that produces less amount of electricity
and large amount of electricity.
28. Which metals are used to make nichrome wire?
29. Why inert gas is filled in filament bulb?
30. What is filament?
31. Name the instrument that is used to increase or decrease the amount of
alternating current.
32. Name the type of transformer, which is used to play a radio with 5 volts in
the electric line of 240 V.
33. What are the special feature of alternating current?
34. What is the frequency of AC supplied in our home?
2 marks questions
1. What is electricity and magnetism?
2. Explain the use of tungsten in an electric bulb.
3. What is fuse? Name the material of the fuse.
4. What capacity of fuse is used in an electric iron of 750W connected to 220 V mains?
5. What do you mean by Kilowatt-hour? What is the relation between 1KWh and Joule?
6. State Faraday's law of electromagnetic induction. What is electromagnetic induction?
7. What is AC? What is the frequency of AC supplied in our house?
8. The coil of the transformer is coated by enamel, why?
9. The fluorescent lamp of 40W give more light than the filament lamp of 40 W, why?
10. State any two differences between step up and step down transformer.
11. Write two differences between tungsten and nichrome.
12. Write down the differences between AC and DC.
13. What is the cause of filling the tube of fluorescent lamp with mercury vapour
and filament bulb with nitrogen gas?
14. Explain how fuse protects an electric circuit.
15. What is dynamo and generator?
16. Why is A.C power used for long distance transmission?
17. Write down the two difference between dynamo and generator.
18. Write down the two difference between filament lamp and fluorescent lamp.
19. Write down the two difference between serial and parallel combination of cells.
20. Write down the two difference between serial and parallel combination of resistors.
21. Why nichrome is used as heating element in a heater?
22. The use of AC is limited without transformer, explain it.
23. Why do we use only AC power for long distance transmission?
24. A current carrying conductor is placed in a magnetic field experiences a force, why?
25. Why does a current carrying conductor kept in magnetic field shift from its position?
26. Why Inert gas is used inside the filament lamp?
27. What is inverter and charger?
28. What is one unit of electricity? Define transformer.
29. Write down the difference between series and parallel connection of cells.
30. What is heating element? Which heating element is used in heater and why?
31. Transformer is used in most of the electric and electronic devices, why?
32. Show that 1 kwh = 3.6 ×106.
33. What happens to the magnitude of the induced electromotive force in an
electric generator if the speed of rotor is doubled? Why?
34. Why is the core of transformer laminated?
35. The coil of the transformer is coated by enamel, why?
36. Write down two differences between electricity generated form dynamo and battery.
37. Why the number of turns in primary coil and secondary coil of a transformer
is never made equal?
38. What is the meaning of the saying that the frequency of alternating current is 50Hz?
39. Why is soft iron core used in transformer?
40. What happens when oxygen gas is used into the filament bulb?
41. The fluorescent lamp with power 80W gives more brightness than the filament
lamp with the same power, why?
42. The filament of the bulb are made of very thin and coiled wire, why?
43. Mention the uses of a battery charger.
44. The filament bulb is filled with nitrogen or inert gases, why?
45. The tungsten metal wire is not used in the heater as heating element, why?
46. The naked wire is not used while making electromagnet, Why?
47. Why the inner wall of the tube light is coated with fluorescent powder?
48. Draw a labeled diagram of an electric bulb.
49. Describe the working mechanism of a solar cell.
50. Give reason.
a. When an electric current is passed through a filament, it glows with bright light
due to heating but it does not happen in other wires.
b. The nichrome is used as an heating element in a heater.
c. Air is removed from the electric bulb.
d. Why are the filament bulbs filled with an inert gas?
e. All electrical appliances are connected in parallel.
f. The switch is always connected to the live wire.
g. The fuse is connected to the live wire.
h. Thin and long tungsten is used in filament bulbs.
i. Tungsten metal wire is not used in heaters.
j. The use of alternating current would be limited, if transformers were not inverted.
k. The number of turns in the primary coil and in the secondary coil are
never made equal in transformers.
l. A fluorescent lamp of 40W glows brighter than the filament bulb with the same power.
51. Write down two differences of each
i. Step up and step down transformer
ii. Filament and fluorescent lamp
iii. Generator and electric motor.
iv. Tungsten and Nichrome
v. Series and parallel combination of resistors.
vi. Series and parallel combination of cell.
vii. AC and DC
3 marks questions
52. Motor effect and electromagnetic induction are opposite to each other.
Classify this statement.
53. Write any three ways to increase magnetic strength of electromagnet.
54. Write three reasons of using electromagnet widely.
55. How can we prove that there is magnetic field around a current carrying conductor?
56. What is an Adapter? How does it make the voltage DC suitable for consumer electronics?
57. Write three laws of Faraday’s electromagnetic induction.
58. State the methods to increase the magnitude of the current generated form a
generator/dynamo.
59. What is the principle of transformer?
60. Does an inverter produce power? Mention its working.
61. Study the diagram and answer the following:
i. Why type of transformer is it?
ii. Calculate the output voltage. (ans. 238.09 V)
iii. Write one use of the type of transformer mentioned.
62. Study the diagram and answer the following:
i. what is shown in the figure?
ii. What about the effect shown in the diagram.
iii. Why does the coil rotates when current is passed?
4 marks questions
63. Name the substance which is used to laminate core of transformer. Give two reasons
for laminating its core. One what principle, it is based on?
64. When wheel of cycle is rotated slowly, bulb becomes dim and when rotated fast,
bulb becomes bright, Why? What change can be seen in the brightness of bulb if
magnetic field is placed parallel to conductor in dynamo?
65. Write any 4 ways to increase induced current from generator or dynamo.
66. What is inverter? It is quiet useful in under development country. Give reason.
Convert 1Kwh into joule.
67. Draw labeled diagram of a step up and step down transformer.
68. Explain the working phenomena of electric bell with diagram.
69. How electricity is produced form generator? Describe with labeled diagram.
70. Draw the ladled diagram of a dynamo and explain its working.
71. Study the diagram and answer the following:
i. Explain why the galvanometer needle shows deflection when the copper wire is
moved up and down perpendicular to the magnetic field lines.
ii. The copper wire is stopped and then the galvanometer is replaced with one ac
source suggest what will be observed.
1. What is electricity?
2. What is electric current? Write its unit.
3. What is D.C?
4. What is a transformer?
5. Define step-up transformer.
6. Which principle is dynamo based on?
7. What is filament? Which material is used as filament?
8. What is the magnetic effect of current electricity?
9. What is mean by heating effect of the electricity?
10. What is full form of CFL and EMF?
11. What is a fuse?
12. Name the material used as a fuse.
13. What do you mean by kilowatt-hour?
14. What is electromagnetic induction?
15. State Faraday's laws of electromagnetic induction.
16. What is motor effect?
17. What is an electromagnet?
18. What is electromagnetic induction? Write its uses.
19. Write down the type of transformer in which turnings of wire in the secondary
coil is less than that of the primary coil.
20. Which coil has greater number of winding in a step-up transformer?
21. What is electroplating?
22. What is electrolysis of water?
23. What do you mean by short circuit?
24. What is inverter?
25. Why is inverter used?
26. What type of metal is used for heating element?
27. Write one example of each instrument that produces less amount of electricity
and large amount of electricity.
28. Which metals are used to make nichrome wire?
29. Why inert gas is filled in filament bulb?
30. What is filament?
31. Name the instrument that is used to increase or decrease the amount of
alternating current.
32. Name the type of transformer, which is used to play a radio with 5 volts in
the electric line of 240 V.
33. What are the special feature of alternating current?
34. What is the frequency of AC supplied in our home?
2 marks questions
1. What is electricity and magnetism?
2. Explain the use of tungsten in an electric bulb.
3. What is fuse? Name the material of the fuse.
4. What capacity of fuse is used in an electric iron of 750W connected to 220 V mains?
5. What do you mean by Kilowatt-hour? What is the relation between 1KWh and Joule?
6. State Faraday's law of electromagnetic induction. What is electromagnetic induction?
7. What is AC? What is the frequency of AC supplied in our house?
8. The coil of the transformer is coated by enamel, why?
9. The fluorescent lamp of 40W give more light than the filament lamp of 40 W, why?
10. State any two differences between step up and step down transformer.
11. Write two differences between tungsten and nichrome.
12. Write down the differences between AC and DC.
13. What is the cause of filling the tube of fluorescent lamp with mercury vapour
and filament bulb with nitrogen gas?
14. Explain how fuse protects an electric circuit.
15. What is dynamo and generator?
16. Why is A.C power used for long distance transmission?
17. Write down the two difference between dynamo and generator.
18. Write down the two difference between filament lamp and fluorescent lamp.
19. Write down the two difference between serial and parallel combination of cells.
20. Write down the two difference between serial and parallel combination of resistors.
21. Why nichrome is used as heating element in a heater?
22. The use of AC is limited without transformer, explain it.
23. Why do we use only AC power for long distance transmission?
24. A current carrying conductor is placed in a magnetic field experiences a force, why?
25. Why does a current carrying conductor kept in magnetic field shift from its position?
26. Why Inert gas is used inside the filament lamp?
27. What is inverter and charger?
28. What is one unit of electricity? Define transformer.
29. Write down the difference between series and parallel connection of cells.
30. What is heating element? Which heating element is used in heater and why?
31. Transformer is used in most of the electric and electronic devices, why?
32. Show that 1 kwh = 3.6 ×106.
33. What happens to the magnitude of the induced electromotive force in an
electric generator if the speed of rotor is doubled? Why?
34. Why is the core of transformer laminated?
35. The coil of the transformer is coated by enamel, why?
36. Write down two differences between electricity generated form dynamo and battery.
37. Why the number of turns in primary coil and secondary coil of a transformer
is never made equal?
38. What is the meaning of the saying that the frequency of alternating current is 50Hz?
39. Why is soft iron core used in transformer?
40. What happens when oxygen gas is used into the filament bulb?
41. The fluorescent lamp with power 80W gives more brightness than the filament
lamp with the same power, why?
42. The filament of the bulb are made of very thin and coiled wire, why?
43. Mention the uses of a battery charger.
44. The filament bulb is filled with nitrogen or inert gases, why?
45. The tungsten metal wire is not used in the heater as heating element, why?
46. The naked wire is not used while making electromagnet, Why?
47. Why the inner wall of the tube light is coated with fluorescent powder?
48. Draw a labeled diagram of an electric bulb.
49. Describe the working mechanism of a solar cell.
50. Give reason.
a. When an electric current is passed through a filament, it glows with bright light
due to heating but it does not happen in other wires.
b. The nichrome is used as an heating element in a heater.
c. Air is removed from the electric bulb.
d. Why are the filament bulbs filled with an inert gas?
e. All electrical appliances are connected in parallel.
f. The switch is always connected to the live wire.
g. The fuse is connected to the live wire.
h. Thin and long tungsten is used in filament bulbs.
i. Tungsten metal wire is not used in heaters.
j. The use of alternating current would be limited, if transformers were not inverted.
k. The number of turns in the primary coil and in the secondary coil are
never made equal in transformers.
l. A fluorescent lamp of 40W glows brighter than the filament bulb with the same power.
51. Write down two differences of each
i. Step up and step down transformer
ii. Filament and fluorescent lamp
iii. Generator and electric motor.
iv. Tungsten and Nichrome
v. Series and parallel combination of resistors.
vi. Series and parallel combination of cell.
vii. AC and DC
3 marks questions
52. Motor effect and electromagnetic induction are opposite to each other.
Classify this statement.
53. Write any three ways to increase magnetic strength of electromagnet.
54. Write three reasons of using electromagnet widely.
55. How can we prove that there is magnetic field around a current carrying conductor?
56. What is an Adapter? How does it make the voltage DC suitable for consumer electronics?
57. Write three laws of Faraday’s electromagnetic induction.
58. State the methods to increase the magnitude of the current generated form a
generator/dynamo.
59. What is the principle of transformer?
60. Does an inverter produce power? Mention its working.
61. Study the diagram and answer the following:
ii. Calculate the output voltage. (ans. 238.09 V)
iii. Write one use of the type of transformer mentioned.
62. Study the diagram and answer the following:
i. what is shown in the figure?
ii. What about the effect shown in the diagram.
iii. Why does the coil rotates when current is passed?
4 marks questions
63. Name the substance which is used to laminate core of transformer. Give two reasons
for laminating its core. One what principle, it is based on?
64. When wheel of cycle is rotated slowly, bulb becomes dim and when rotated fast,
bulb becomes bright, Why? What change can be seen in the brightness of bulb if
magnetic field is placed parallel to conductor in dynamo?
65. Write any 4 ways to increase induced current from generator or dynamo.
66. What is inverter? It is quiet useful in under development country. Give reason.
Convert 1Kwh into joule.
67. Draw labeled diagram of a step up and step down transformer.
68. Explain the working phenomena of electric bell with diagram.
69. How electricity is produced form generator? Describe with labeled diagram.
70. Draw the ladled diagram of a dynamo and explain its working.
71. Study the diagram and answer the following:
i. Explain why the galvanometer needle shows deflection when the copper wire is
moved up and down perpendicular to the magnetic field lines.
ii. The copper wire is stopped and then the galvanometer is replaced with one ac
source suggest what will be observed.
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