Electricity Past Paper PDF

## F. Answer the following questions. 1. What is the purpose of using an electric switch in an electric circuit? 2. State two precautions that should be exercised while dealing with electricity. 3. Draw a closed circuit using symbols of an electric bulb, cell, switch and connecting wires. 4. How ar...

## F. Answer the following questions. 1. What is the purpose of using an electric switch in an electric circuit? 2. State two precautions that should be exercised while dealing with electricity. 3. Draw a closed circuit using symbols of an electric bulb, cell, switch and connecting wires. 4. How are insulators important in electrical circuits? 5. What are the essential components in an electric circuit? 6. How are dry cells different from chargeable cells? 7. What are secondary cells? 8. State two uses of conductor and insulator of electricity. 9. Where did the word 'electricity' originate from? 10. Draw neat and labelled circuit diagram of a torch. 11. Differentiate between the following: * a. open and closed circuit * b. conductor and insulator of electricity 12. What are the various possibilities for the bulb not to glow in an electric circuit? 13. Give reasons: * a. Electricians are advised to wear rubber gloves while working on electrical devices. * b. Electric switches and boards are made up of plastic. * c. One should not touch switches with wet hands. 14. What will happen if both the terminals of a cell are directly connected without connecting them through a switch and a bulb? 15. Filament of an electric bulb is made up of tungsten and not any other material. Why? 16. Your brother has made a battery-operated torch using two cells and has come to ask you how he may make the torch more powerful. What would you advise him? 17. What kind of cells would you use in the following cases? * a. Car * b. Transistor radio * c. Hearing aid 18. Why are solar cells used as a source of power in satellites? 19. Instead of plastic, can the electric wires be covered with aluminum foil? ## B. Fill in the blanks. 1. An electric cell has _______ terminals. The metal cap is _______ terminal of the cell. 2. The filament of the bulb is made of _______. 3. An electric bulb converts _______ energy to _______ and _______ energy. 4. Most _______ are good conductors of electricity. 5. The path of electric current is known as _______. 6. Substances that allow electric current to pass through them are called _______. ## C. State whether the following statements are True or False. 1. Electrical wires are generally made up of metals. 2. Copper is a conductor of electricity whereas plastic is an insulator of electricity. 3. An electric cell converts electrical energy into chemical energy. 4. Filament of the bulb has low melting point. 5. In an open circuit, the switch is in ON position. 6. Switch can be attached anywhere in the circuit. 7. A dry cell can be used to light up huge buildings. 8. We should switch off an electrical device before unplugging it. ## D. Give one word/term for the following. 1. A portable source of electrical energy. 2. Device used to make or break a circuit. 3. Materials that do not allow electricity to pass through them. 4. A good conductor of electricity. 5. Device that converts chemical energy to electricity. 6. Closed continuous path through which current flows. ## E. Match the columns: | 1. Filament of bulb | a. converts electrical energy to sound energy | | :------------------------ | :---------------------------------------------- | | 2. Electric bell | b. negative end | | 3. Longer line in the cell | c. battery | | 4. Shorter line in the cell | d. tungsten | | 5. Portable lamp | e. positive end | | 6. Portable source of electricity | f. torch | ## A. Tick (✔) the correct answer. 1. An electric bulb has: * a. 1 terminal * b. 2 terminals * c. 3 terminals * d. 4 terminals 2. Which of the following is the source of electricity in a mobile phone? * a. Charger * b. Solar cell * c. Primary cell * d. Secondary cell 3. The electric current in a closed circuit always flows from _______ terminal of the cell to the _______ terminal. * a. positive, negative * b. negative, positive * c. positive, positive * d. negative, negative 4. Secondary cells are also known as: * a. animal cells * b. plant cells * c. batteries * d. accumulators 5. Symbol of battery is: * a. ㅓ바 * b. ㅔㅔ * c. ㅡㅡ * d. ㅡㅡ 6. Which of the following controls the flow of current in a circuit? * a. Wire * b. Switch * c. Battery * d. Bulb