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Mathematics · 2024 · 5 marks
CBSE 2024 · Region 5 · Set 3 · Q35
A juice seller was serving his customers using glasses as shown in the figure. The inner diameter of the cylindrical glass was $\displaystyle 5 \cdot 6$ cm, but the bottom of the glass had a hemispherical raised portion which reduced the capacity of the glass. If the height of the glass was $\displaystyle 10$ cm, find the apparent capacity and the actual capacity of the glass.

Marking-scheme solution
Radius( r ) \(\displaystyle =2.8 \mathrm{~cm}\)
\[\begin{aligned}
\text { Apparent capacity of glass }== & \frac{22}{7} \times 2.8 \times 2.8 \times 10 \\
& =246.4 \mathrm{~cm}^{3}
\end{aligned}
\]
\[\begin{gathered}
\text { Volume of hemispherical part }==\frac{2}{3} \times \frac{22}{7} \times 2.8 \times 2.8 \times 2.8 \\
=45.9 \mathrm{~cm}^{3}
\end{gathered}
\]
\[\begin{aligned}
\therefore \text { Actual capacity of glass } & =246.4-45.9 \\
& =200.5 \mathrm{~cm}^{3} \text { or } 200.5 \mathrm{ml}
\end{aligned}
\]
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CBSE Class 10 Mathematics past-paper question from the 2024board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.