Chapter 13 – Surface Areas and Volumes
4. In a cylinder, radius is doubled and height is halved, curved surface area will be
03
Jul
4. In a cylinder, radius is doubled and height is halved, curved surface area will be 4. In a cylinder curved surface area will be radius is doubled and height is halved July 3, 2021 Category: Chapter 13 - Surface Areas and Volumes , Maths , NCERT Class 9 ,
3. A cone is 8.4 cm high and the radius of its base is 2.1 cm. It is melted and recast into a sphere. The radius of the sphere is :
03
Jul
3. A cone is 8.4 cm high and the radius of its base is 2.1 cm. It is melted and recast into a sphere. The radius of the sphere is : 3. A cone is 8.4 cm high and the radius of its base is 2.1 cm. It is melted and recast into a sphere. [...]
2. The total surface area of a cube is 96 cm^2. The volume of the cube is:
03
Jul
2. The total surface area of a cube is 96 cm^2. The volume of the cube is: 2. The total surface area of a cube is 96 cm^2. The volume of the cube is: July 3, 2021 Category: Chapter 13 - Surface Areas and Volumes , Maths , NCERT Class 9 ,
1. The radius of a sphere is 2r, then its volume will be
03
Jul
1. The radius of a sphere is 2r, then its volume will be 1. The radius of a sphere is 2r then its volume will be July 3, 2021 Category: Chapter 13 - Surface Areas and Volumes , Maths , NCERT Class 9 ,
10. A capsule of medicine is in the shape of a sphere of diameter 3.5 mm. How much medicine (in mm^3) is needed to fill this capsule?
17
Oct
10. A capsule of medicine is in the shape of a sphere of diameter 3.5 mm. How much medicine (in mm^3) is needed to fill this capsule? 10. A capsule of medicine is in the shape of a sphere of diameter 3.5 mm. How much medicine (in mm^3) is needed to fill this capsule? October [...]
9. Twenty-seven solid iron spheres, each of radius r and surface area S are melted to form a sphere with surface area S’. Find the (i) radius r’ of the new sphere, (ii) ratio of S and S’.
17
Oct
9. Twenty-seven solid iron spheres, each of radius r and surface area S are melted to form a sphere with surface area S’. Find the (i) radius r’ of the new sphere, (ii) ratio of S and S’. (ii) ratio of S and S’. 9. Twenty-seven solid iron spheres each of radius r and surface [...]
8. A dome of a building is in the form of a hemisphere. From inside, it was white-washed at the cost of Rs. 4989.60. If the cost of white-washing isRs20 per square meter, find the (i) inside surface area of the dome (ii) volume of the air inside the dome
17
Oct
8. A dome of a building is in the form of a hemisphere. From inside, it was white-washed at the cost of Rs. 4989.60. If the cost of white-washing isRs20 per square meter, find the (i) inside surface area of the dome (ii) volume of the air inside the dome 8. A dome of a [...]
7. Find the volume of a sphere whose surface area is 154 cm^2.
17
Oct
7. Find the volume of a sphere whose surface area is 154 cm^2. 7. Find the volume of a sphere whose surface area is 154 cm^2. October 17, 2020 Category: Chapter 13 - Surface Areas and Volumes , Maths , NCERT Class 9 ,
6. A hemi spherical tank is made up of an iron sheet 1cm thick. If the inner radius is 1 m, then find the volume of the iron used to make the tank.
17
Oct
6. A hemi spherical tank is made up of an iron sheet 1cm thick. If the inner radius is 1 m, then find the volume of the iron used to make the tank. 6. A hemi spherical tank is made up of an iron sheet 1cm thick. If the inner radius is 1 m then [...]
5. How many litres of milk can a hemispherical bowl of diameter 10.5cm hold?
17
Oct
5. How many litres of milk can a hemispherical bowl of diameter 10.5cm hold? 5. How many litres of milk can a hemispherical bowl of diameter 10.5cm hold? October 17, 2020 Category: Chapter 13 - Surface Areas and Volumes , Maths , NCERT Class 9 ,