CBSE Class 7 Science Electricity: Circuits and Their Components (Class 7 NCERT New) Quiz 9

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1. How does a homemade switch using a safety pin control a lamp in a simple circuit?

A Closing the pin makes the metal parts touch and complete the circuit; opening the pin separates them and breaks the circuit B Closing the pin insulates the connection, stopping current; opening the pin removes insulation, allowing current C Closing the pin reverses the battery terminals; opening the pin restores them D Closing the pin changes the bulb’s resistance; opening the pin resets it

2. How can you distinguish conductors from insulators using a simple circuit experiment, and which examples fit each category?

A Insert a test material between two clips in a bulb circuit: if the bulb lights it’s a conductor (e.g., copper wire, steel paper clip); if it doesn’t it’s an insulator (e.g., rubber eraser, plastic straw) B Touch each item to the battery and listen for a sound: loud items are conductors; silent items are insulators C Weigh each item: heavier items are conductors; lighter items are insulators D Heat each item with the bulb: items that melt are conductors; those that don’t are insulators

3. Why is it important to understand circuit diagrams and standard symbols when building electrical circuits?

A They provide a clear, universal way to plan and connect components correctly and to troubleshoot safely B They make circuits glow brighter than those built without diagrams C They are required only for alternating-current circuits, not direct-current ones D They eliminate the need for testing or measuring in circuits

Practice more on Electricity: Circuits and Their Components (Class 7 NCERT New)

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