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Surface Areas and Volumes
NCERT Exemplar
CBSE
Grade 10

Question:

A wooden toy rocket is in the shape of a cone mounted on a cylinder. The total height of the rocket is $26\text{ cm}$, while the height of the conical part is $6\text{ cm}$. The height of the cylindrical part is:
(a) $20\text{ cm}$
(b) $26\text{ cm}$
(c) $16\text{ cm}$
(d) $32\text{ cm}$

Step-by-Step Solution

Key Concept: Cylindrical height $=$ total height $-$ conical height.
Height of cylinder $= 26 - 6 = 20\text{ cm}$. [1.0 Mark]

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🎯 Official CBSE Marking Scheme:
Calculating height of cylinder $= 20\text{ cm}$: 1.0 Mark

Correct Answer: $20\text{ cm}$
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