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# Hots Questions- Surface Areas and Volumes Class 9 Notes | EduRev

## Mathematics (Maths) Class 9

Created by: Full Circle

## Class 9 : Hots Questions- Surface Areas and Volumes Class 9 Notes | EduRev

The document Hots Questions- Surface Areas and Volumes Class 9 Notes | EduRev is a part of the Class 9 Course Mathematics (Maths) Class 9.
All you need of Class 9 at this link: Class 9

Question 1. A brick measures 30 cm × 10 cm ×  cm. How many bricks will be required for a wall 30 m long, 2 m high and (3/4)m thick?

Hint: Volume of wall (cuboid) = 30 × 2 × (3/4) m= 45 m3
Volume of 1 brick  =

∴ Required number of bricks =

Question 2. The surface area of a cube is m2. Find its volume.
Hint:
Total S.A. = 6(side)2 ⇒ side2 =  ÷ 6

∴ Volume = (side)

Question 3. A hemispherical tank is emptied by a pipe at the rate of 5 litres per minute. How long will it take to half empty the tank if it is  metre in diameter. [Take π = (22/7) and 1l = 1000 cm]3

Volume of the hemisphere = (1/2) (volume of a sphere) =

Volume to be emptied

∵ 5 litres is emptied in 1 minute

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