RRB NTPC Mains or Stage 2 Model Paper 7 with solutions

Question : 24 of 120

Marks: +1, -0

If the number of square centimetres on the surface area of a sphere is three times the number of cubic centimetres in its volume, then what is its diameter?

1 cm
2 cm
3 cm
6 cm

Validate

Solution:

(b) (a)ccording to question
Surface area of sphere = 3 (Volume of sphere)

⇒4πr^2 = 3 ×4 /3 πr^3⇒r=1

∴Diameter = 2r = 2 cm

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