CBSE 2025 · Region 4 · Set 1 · Q14 · 1 mark
The minimum number of identical bulbs of rating 4V; 6W, that can work safely with desired brightness, when connected in series with a $\displaystyle 240$ V mains supply is :
Official answer
From CBSE’s own marking scheme for this paper.
(C)
$\displaystyle 60$
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CBSE Class 10 Science past-paper question from the 2025board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.