Official Class 8 Science Worksheets: Chapter 04 Electricity Magnetic And Heating Effects
Review targeted academic worksheets with the CBSE Class 8 Science Electricity Worksheet Set 01. Built according to official educational standards for the 2026-27 term, these downloadable Class 8 Science resources support effective daily practice and detailed self-evaluation for Chapter 04 Electricity Magnetic And Heating Effects.
Solved Practice Worksheets for Science
Access the complete worksheet PDF for Class 8 Science below. Regular practice with these targeted academic tasks builds familiarity with standard question patterns and helps secure higher marks in final school examinations.
A. Check Point
1. Examples of daily appliances that consume electricity.
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Answer: Fan, light bulb, refrigerator, television, washing machine and air conditioner.
Teacher's Note: Use the key term in your answer.
2. Explain the live wire, neutral wire and earth wire.
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Answer: The live wire (red) carries current to the appliance. The neutral wire (black) returns the current to the supply. The earth wire (green) leads any leaking current to the ground to protect us from electric shock.
Teacher's Note: Give an example if the question allows.
1. Combing dry hair has charged one of two identical combs. How do you find which one?
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Answer: Bring each comb near small bits of paper. The charged comb attracts the bits of paper.
Teacher's Note: Write a short, clear answer.
2. Two types of electric charges.
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Answer: Positive and negative.
Teacher's Note: Remember this for your exam.
3. The charge on a glass rod rubbed with silk.
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Answer: Positive.
Teacher's Note: Learn this point and write it in your own words.
4. A positively charged body attracts another charged body. What is the charge on the other?
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Answer: Negative, because unlike charges attract.
Teacher's Note: Use the key term in your answer.
5. What is the law of electrostatic attraction and repulsion?
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Answer: Like charges repel each other and unlike charges attract each other.
Teacher's Note: Give an example if the question allows.
6. How are the flow of electrons and the direction of conventional current related?
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Answer: They are in opposite directions. Electrons flow from the negative terminal to the positive terminal, while the conventional current is taken from positive to negative.
Teacher's Note: Write a short, clear answer.
1. Two methods to charge a body. 2. How do you charge a plastic comb by friction?
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Answer: By friction, conduction and induction. Rub the plastic comb with dry hair: electrons move from the hair to the comb, and the comb becomes negatively charged.
Teacher's Note: Remember this for your exam.
3. A glass rod rubbed with silk touches a metallic pin hung by a cotton thread. Will the pin get charged?
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Answer: Yes, by conduction, and it gets a positive charge, the same as the glass rod.
Teacher's Note: Learn this point and write it in your own words.
4. Why is it difficult to charge a metallic rod by friction?
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Answer: A metal is a good conductor, so the charge flows through the body of the person holding it to the ground and cannot be held on the rod.
Teacher's Note: Use the key term in your answer.
5. Which device detects the presence of charge?
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Answer: An electroscope.
Teacher's Note: Give an example if the question allows.
1. How does an electric shock affect a person?
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Answer: It can cause burns, muscle pain, breathing difficulty, stopping of the heart and even death.
Teacher's Note: Write a short, clear answer.
2. How does a battery work in a mobile phone?
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Answer: A battery converts chemical energy into electrical energy. A chemical reaction in it moves electrons from one terminal through the circuit of the phone to the other terminal, and this flow of charge is the current.
Teacher's Note: Remember this for your exam.
B. Keywords
15. Define: electricity, electric current, circuit breaker, static electricity, conduction, induction, electroscope.
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Answer: Electricity: a form of energy caused by charged particles. Electric current: the flow of electric charge. Circuit breaker: a switch that cuts off the current automatically when the circuit is overloaded. Static electricity: charge at rest on a body. Conduction: charging a body by touching it with a charged body. Induction: charging a body without touching, by bringing a charged body near it. Electroscope: a device that detects charge.
Teacher's Note: Learn this point and write it in your own words.
C. Multiple Choice Questions
(i) An ebonite rod rubbed with flannel (a) both positive (b) rod positive, cloth negative (c) both negative (d) rod negative, cloth positive
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Answer: (d) The rod becomes negative and the cloth positive.
Teacher's Note: Use the key term in your answer.
(ii) Cannot be charged easily by friction: (a) glass rod (b) copper rod (c) wool (d) balloon
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Answer: (b) A copper rod.
Teacher's Note: Give an example if the question allows.
(iii) An electroscope charged by induction with a charged glass rod has a charge of (a) negative (b) positive (c) both (d) none
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Answer: (a) Negative (induction gives the opposite charge).
Teacher's Note: Write a short, clear answer.
(iv) Charge on a glass rod rubbed with silk: (a) negative (b) positive
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Answer: (b) Positive.
Teacher's Note: Remember this for your exam.
(v) Like charges brought near show (a) attraction (b) repulsion
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Answer: (b) Repulsion.
Teacher's Note: Learn this point and write it in your own words.
(vi) A good conductor: (a) hydrogen (b) oxygen (c) silver (d) plastic
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Answer: (c) Silver.
Teacher's Note: Use the key term in your answer.
(vii) Charges always occur (a) together (b) separately
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Answer: (a) Together.
Teacher's Note: Give an example if the question allows.
(viii) The flow of electrons is known as (a) electric current (b) potential (c) field
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Answer: (a) Electric current.
Teacher's Note: Write a short, clear answer.
(ix) An insulator: (a) mercury (b) glass (c) copper (d) silver
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Answer: (b) Glass.
Teacher's Note: Remember this for your exam.
(x) A device to protect tall buildings from lightning: (a) electroscope (b) lightning conductor (c) telescope
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Answer: (b) Lightning conductor.
Teacher's Note: Learn this point and write it in your own words.
D. Fill in the Blanks, True or False, Match
26. Fill in the blanks: 1. ____ charge is constant and cannot be created or destroyed. 2. Static electricity is caused by ____. 4. ____ is produced by rubbing objects together. 6. ____ is dangerous and can cause loss of life. 7. We use ____ in mobiles, cars and music systems. 8. We safeguard tall buildings from lightning by using ____. 10. A ____ has a thin metallic filament that melts when the circuit is overheated.
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Answer: 1. Electric; 2. friction (rubbing); 4. Static electricity; 6. Electric shock; 7. batteries (cells); 8. lightning conductors; 10. fuse.
Teacher's Note: Use the key term in your answer.
27. True or False: 1. When protons and electrons are balanced, charge is created. 2. MCBs are not preferred in household wiring. 3. An object with more protons than electrons is positively charged. 7. The flow of electrons is opposite to the current. 8. Electricity is a form of energy. 9. Use of electricity has decreased due to urbanisation. 10. Cartridge fuses can be replaced when the wire melts. 11. Like charges attract. 12. In charging, only negative charges are transferred. 13. A charged body induces an opposite charge on a nearby uncharged body. 14. An electroscope charges a body by induction. 15. Materials that allow charge to pass are insulators. 16. Charges are created when a body is rubbed. 17. An ebonite rod rubbed with flannel gets a negative charge. 19. Repulsion is a sure test of charge.
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Answer: 1. False; 2. False (MCBs are preferred); 3. True; 7. True; 8. True; 9. False; 10. False; 11. False; 12. True; 13. True; 14. False (it detects charge); 15. False (they are conductors); 16. False (they are only transferred); 17. True; 19. True.
Teacher's Note: Give an example if the question allows.
28. Match: 1. like charges 2. unlike charges 3. ebonite rod with flannel 4. glass rod with silk 5. silver 6. plastic 7. lightning conductor 8. electroscope.
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Answer:
| Item | Match |
|---|---|
| 1 | h. repel each other |
| 2 | g. attract each other |
| 3 | e. acquires a negative charge |
| 4 | a. acquires a positive charge |
| 5 | d. conductor |
| 6 | b. insulator |
| 7 | f. protects buildings and human life |
| 8 | c. detects the presence of charge |
Teacher's Note: Write a short, clear answer.
E. Answer the Following
1. The function of the live, neutral and earth wires.
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Answer: The live wire brings the current in, the neutral wire completes the circuit by taking it back, and the earth wire carries leakage current safely to the ground.
Teacher's Note: Remember this for your exam.
2. Safety components.
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Answer: Fuses melt and break the circuit when too much current flows. MCBs (miniature circuit breakers) switch off automatically. The earth wire and lightning conductors protect against shocks and lightning.
Teacher's Note: Learn this point and write it in your own words.
3. Static electricity with an example.
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Answer: Static electricity is charge that stays at rest on a body. Example: when we rub a plastic comb on dry hair it picks up small bits of paper.
Teacher's Note: Use the key term in your answer.
5. Explain conduction.
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Answer: Conduction is charging by contact. When a charged body touches an uncharged conductor, charge moves to it, and it gets the same kind of charge.
Teacher's Note: Give an example if the question allows.
6. Explain induction.
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Answer: Induction is charging without touching. A charged body brought near a conductor attracts the opposite charge to the near end and pushes the same charge to the far end. If the far end is earthed, the conductor keeps the opposite charge.
Teacher's Note: Write a short, clear answer.
7. Detecting charge using an electroscope.
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Answer: Touch the disc with the body. If the body is charged, charge passes down the rod and the two gold leaves, with the same charge, repel each other and diverge. Uncharged bodies produce no divergence.
Teacher's Note: Remember this for your exam.
8. How does a car battery work?
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Answer: A car battery has lead plates in sulphuric acid. A chemical reaction between the plates and the acid creates a flow of electrons that gives current to start the engine and run the lights.
Teacher's Note: Learn this point and write it in your own words.
36. Give reasons: 1. A glass rod and silk are both charged on rubbing. 2. A comb rubbed with dry hair attracts bits of paper. 3. The leaves of a charged electroscope collapse when an uncharged body touches the disc. 4. A lightning conductor is fixed on tall buildings. 5. When a charged body is brought near an uncharged one, the unlike charge appears at the nearer end.
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Answer: 1. Electrons move from the glass to the silk, so the glass becomes positive and the silk negative. 2. The comb gets charged and attracts the neutral paper by induction. 3. The charge flows away through the body, so the leaves lose it and collapse. 4. It carries lightning charge safely to the ground and saves the building. 5. The charged body attracts the opposite charge to the nearer end, which is induction.
Teacher's Note: Use the key term in your answer.
37. Odd one out: 1. plastic, rubber, wood, glass, aluminium 3. mercury, graphite, oxygen, human body, steel 4. glass rod, ebonite rod, flannel, silk, aluminium rod
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Answer: 1. Aluminium (a conductor; the rest are insulators). 3. Oxygen (a non-conductor; the rest conduct). 4. Aluminium rod (cannot be charged easily by friction, since it is a conductor).
Teacher's Note: Give an example if the question allows.
38. Differentiate: 1. conductors and insulators 2. conduction and induction.
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Answer:
| Pair | Difference |
|---|---|
| Conductors and insulators | Conductors allow charge to flow (copper, silver); insulators do not (glass, rubber, plastic). |
| Conduction and induction | In conduction the bodies touch, and the charge is the same; in induction they do not touch, and the charge is opposite. |
Teacher's Note: Write a short, clear answer.
Free study material for Science
Chapter 04 Electricity Magnetic And Heating Effects Printable Worksheets and Exercises for Class 8 Science
Practice Exercises for Class 8 Science Chapter 04 Electricity Magnetic And Heating Effects
Review targeted practice exercises for Class 8 Science Chapter 04 Electricity Magnetic And Heating Effects. Curated to match official CBSE guidelines, these printable problem sets support daily revision and improve overall test readiness.
Step-by-Step Solutions and Practice Guidelines
Designed around the official curriculum for Class 8 Science, these practice sheets guarantee standard compliance. Reviewing step-by-step solutions after completion sharpens your accuracy and clarifies complex sub-topics within Chapter 04 Electricity Magnetic And Heating Effects.
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