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Science · 2022 · 3 marks
CBSE 2022 · Region 4 · Set 1 · Q12
(a) A student wants to use an electric heater, an electric bulb and an electric fan simultaneously. How should these gadgets be connected with the…
(a)
A student wants to use an electric heater, an electric bulb and an electric fan simultaneously. How should these gadgets be connected with the mains? Justify your answer giving three reasons.
(b)
What is an electric fuse ? How is it connected in a circuit ?
Marking-scheme solution
(a)
• These appliances/gadgets should be connected in parallel.
Justification:
These gadgets need current of widely different values to operate properly.
independent switching can be done for different appliances.
If any component fails, other gadgets may function.
All gadgets get the required voltage for their operation.
Effective resistance decreases hence heat loss minimizes.
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CBSE Class 10 Science past-paper question from the 2022 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.