A lead hemisphere of radius 7 cm is molded into a cone whose base diameter is 14 cm. Find the height of the cone.

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SSC GD Constable (2022) Official Paper (Held On : 08 Feb 2023 Shift 4)
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  1. 12 cm
  2. 14 cm
  3. 18 cm
  4. 16 cm

Answer (Detailed Solution Below)

Option 2 : 14 cm
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Detailed Solution

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Given:

Radius of hemisphere = 7 cm

Diameter of cone = 14 cm

Formula Used:

Volume of hemisphere = 2/3 × πR3

Volume of cone = 1/3 × πr2h

Calculation:

⇒ 2/3 × πR1/3 × πr2h

⇒ 2/3 × π71/3 × π72h

⇒ 2 × 7= 1 × 72h

⇒ h = 14

The answer is 14 cm.

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