CBSE 2026 · Region 4 · Set 3 · Q11 · 1 mark

A galvanometer of resistance G is converted into a voltmeter of range ( $\displaystyle 0-\mathrm{V}$ ) by connecting a resistor of $\displaystyle 250 \Omega$ with it. If resistor of $\displaystyle 250 \Omega$ is replaced by another resistor of $\displaystyle 900 \Omega$, its range becomes ($\displaystyle 0$-$\displaystyle 3$ V). The resistance G of the galvanometer is :

CBSE Class 12 Physics past-paper question from the 2026board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.