Electricity: Circuits and their Components — Practice

Q1. An electric cell is best described as

• A. A device that converts heat into light
• B. A portable source of electrical energy
• C. A long wire used to carry current
• D. A switch that breaks the circuit

Q2. An electric cell has

• A. Only one terminal
• B. Two terminals — one positive and one negative
• C. Three terminals — positive, negative and neutral
• D. Four terminals arranged in a square

Q3. On an ordinary electric cell, the positive terminal is the

• A. Small protruding metal cap on one side
• B. Flat metal disc on the other side
• C. Plastic ring around the middle
• D. Paper label printed with the brand

Q4. A combination of two or more electric cells joined together is called a

• A. Filament
• B. Conductor
• C. Battery
• D. Switch

Q5. The thin wire fixed in the middle of the glass bulb of an incandescent lamp is called the

• A. Filament
• B. Terminal
• C. Insulator
• D. Conductor strip

Q6. In a Light Emitting Diode (LED), the positive terminal is the

• A. Shorter wire
• B. Longer wire
• C. Wire painted red
• D. Wire wrapped in plastic

Q7. Electric current can pass through an LED

• A. In any direction
• B. In one direction only
• C. Only when the LED is heated
• D. Only when the LED is painted black

Q8. An electrical circuit provides

• A. A path that is always blocked at one point
• B. A complete path for electric current to flow
• C. A way to convert light into heat
• D. A method to weigh electrical objects

Q9. In an electrical circuit, the direction of electric current is taken to be from

• A. The negative terminal to the positive terminal of the cell
• B. The positive terminal to the negative terminal of the cell
• C. The switch to the lamp only
• D. The filament to the metal cap of the cell

Q10. A switch is a simple device that either

• A. Generates electric current
• B. Stores electrical energy in a cell
• C. Completes a circuit or breaks a circuit
• D. Converts AC into DC

Q11. When a switch in a circuit is in the 'ON' position

• A. The circuit is open and current does not flow
• B. The circuit is closed and current flows
• C. The cell is removed automatically
• D. The lamp is taken out of the holder

Q12. Materials through which electric current can pass easily are called

• A. Good conductors of electricity
• B. Insulators of electricity
• C. Filaments of electricity
• D. Switches of electricity

Q13. Which of the following is an electrical insulator?

• A. Copper
• B. Iron
• C. Aluminium
• D. Rubber

Q14. According to the chapter, which set of metals is described as the best electrical conductors?

• A. Silver, copper and gold
• B. Iron, aluminium and tin
• C. Zinc, lead and mercury
• D. Steel, brass and nickel

Q15. For experiments on electricity in school, the chapter advises students to use

• A. Power from the wall socket directly
• B. Power from a portable generator
• C. Only batteries or cells, like those in torchlights and wall clocks
• D. Open household wires after removing the plastic cover