CBSE Class 7 Science Electricity: Circuits and Their Components (Class 7 NCERT New) Quiz 3

1. Which object is most likely to make the tester lamp glow?

A Plastic ruler B Wooden stick C Metal key D Rubber eraser

2. Which object is least likely to allow current to pass?

A Coin B Aluminium foil C Plastic scale D Sewing needle

3. A circuit works properly with a copper wire. If only that wire is replaced with a plastic strip, what will most likely happen?

A The lamp glows brighter B The lamp glows dimly C The lamp does not glow D The battery becomes weak

4. Why are metals generally used to make electrical wires?

A They are transparent. B They are conductors of electricity. C They are lighter than plastic. D They produce electricity.

5. According to the textbook, why is copper commonly used for electrical wiring?

A It is the strongest metal. B It is inexpensive compared with silver and is abundantly available. C It is the only conductor. D It is an insulator.

6. Which group contains only electrical insulators?

A Copper, Silver, Gold B Plastic, Rubber, Ceramics C Iron, Copper, Aluminium D Aluminium, Glass, Copper

7. Which statement correctly explains the covering of electrical wires?

A It improves conductivity. B It increases current flow. C It protects people from electric shocks. D It stores electrical energy.

8. Which statement about the human body is correct according to the textbook?

A It is an electrical insulator. B It is a poor conductor. C It conducts electricity. D It blocks electric current completely.

9. Which practice follows the safety advice given in the textbook?

A Touching switches with wet hands B Using damaged plugs C Handling electrical appliances with dry hands D Repairing live wires without protection

10. A student says, "If the switch is OFF, current can still flow because the battery is connected." Which textbook concept disproves this statement?

A Conductors increase voltage B An open circuit prevents current flow C Batteries work only with LEDs D Lamps need two batteries