Chapter 13 – Surface Areas and Volumes

3. A cuboidal vessel is 10m long and 8m wide. How high must it be made to hold 380 cubic metres of a liquid? 3. A cuboidal vessel is 10m long and 8m wide. How high must it be made to hold 380 cubic metres of a liquid? October 17, 2020 Category: Chapter 13 - [...]

2. A cuboidal water tank is 6m long, 5m wide and 4.5m deep. How many litres of water can it hold? (1 m^3= 1000 l) 2. A cuboidal water tank is 6m long 5m wide and 4.5m deep. How many litres of water can it hold? (1 m^3= 1000 l) October 17, 2020 Category: Chapter [...]

1. A matchbox measures 4 cm×2.5cm×1.5cm. What will be the volume of a packet containing 12 such boxes? 1. A matchbox measures 4 cm×2.5cm×1.5cm. What will be the volume of a packet containing 12 such boxes? October 17, 2020 Category: Chapter 13 - Surface Areas and Volumes , Maths , NCERT Class 9 ,

9. A right circular cylinder just encloses a sphere of radius r (see fig. 13.22). Find (i) surface area of the sphere, (ii) curved surface area of the cylinder, (iii) ratio of the areas obtained in(i) and (ii). (ii) curved surface area of the cylinder (iii) ratio of the areas obtained in(i) and (ii). 9. [...]

8. A hemispherical bowl is made of steel, 0.25 cm thick. The inner radius of the bowl is 5cm. Find the outer curved surface of the bowl. 0.25 cm thick. The inner radius of the bowl is 5cm. Find the outer curved surface of the bowl. 8. A hemispherical bowl is made of steel October [...]

7. The diameter of the moon is approximately one fourth of the diameter of the earth. Find the ratio of their surface areas. 7. The diameter of the moon is approximately one fourth of the diameter of the earth. Find the ratio of their surface areas. October 17, 2020 Category: Chapter 13 - Surface Areas [...]

6. Find the radius of a sphere whose surface area is 154 cm^2. 6. Find the radius of a sphere whose surface area is 154 cm^2. October 17, 2020 Category: Chapter 13 - Surface Areas and Volumes , Maths , NCERT Class 9 ,

5. A hemispherical bowl made of brass has inner diameter 10.5cm. Find the cost of tin-plating it on the inside at the rate of Rs 16 per 100 cm^2. 5. A hemispherical bowl made of brass has inner diameter 10.5cm. Find the cost of tin-plating it on the inside at the rate of Rs 16 [...]

4. The radius of a spherical balloon increases from 7cm to 14cm as air is being pumped into it. Find the ratio of surface areas of the balloon in the two cases. 4. The radius of a spherical balloon increases from 7cm to 14cm as air is being pumped into it. Find the ratio of [...]

3. Find the total surface area of a hemisphere of radius 10 cm. [Use π=3.14] 3. Find the total surface area of a hemisphere of radius 10 cm. [Use π=3.14] October 17, 2020 Category: Chapter 13 - Surface Areas and Volumes , Maths , NCERT Class 9 ,