NCERT Class 9
1. Give five examples of data that you can collect from your day-to-day life.
17
Oct
1. Give five examples of data that you can collect from your day-to-day life. 1. Give five examples of data that you can collect from your day-to-day life. October 17, 2020 Category: Chapter 14 - Statistics , 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 ,
4. The diameter of the moon is approximately one-fourth of the diameter of the earth. What fraction of the volume of the earth is the volume of the moon?
17
Oct
4. The diameter of the moon is approximately one-fourth of the diameter of the earth. What fraction of the volume of the earth is the volume of the moon? 4. The diameter of the moon is approximately one-fourth of the diameter of the earth. What fraction of the volume of the earth is the volume [...]
3.The diameter of a metallic ball is 4.2cm. What is the mass of the ball, if the density of the metal is 8.9 g per cm^3?
17
Oct
3.The diameter of a metallic ball is 4.2cm. What is the mass of the ball, if the density of the metal is 8.9 g per cm^3? 3.The diameter of a metallic ball is 4.2cm. What is the mass of the ball if the density of the metal is 8.9 g per cm^3? October 17, 2020 [...]
2. Find the amount of water displaced by a solid spherical ball of diameter (ii) 0.21 m
17
Oct
2. Find the amount of water displaced by a solid spherical ball of diameter (ii) 0.21 m 2. Find the amount of water displaced by a solid spherical ball of diameter (ii) 0.21 m October 17, 2020 Category: Chapter 13 - Surface Areas and Volumes , Maths , NCERT Class 9 ,