The document Hots Questions- Surface Areas and Volumes Class 9 Notes | EduRev is a part of the Class 9 Course Mathematics (Maths) Class 9.

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**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^{3 }= 45 m^{3}

Volume of 1 brick =

∴ Required number of bricks =

**Question 2. The surface area of a cube is ****m ^{2}. Find its volume. Hint: **Total S.A. = 6(side)

∴ Volume = (side)^{3 } =

**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}**

**Hint:** Radius

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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