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Surface Area and Volumes EXERCISE 11.2 Solutions
- Q1(i): Find the surface area of a sphere of radius: (i) $10.5$ cm
- Q1(ii): Find the surface area of a sphere of radius: (ii) $5.6$ cm
- Q1(iii): Find the surface area of a sphere of radius: (iii) $14$ cm
- Q2(i): Find the surface area of a sphere of diameter: (i) $14$ cm
- Q2(ii): Find the surface area of a sphere of diameter: (ii) $21$ cm
- Q2(iii): Find the surface area of a sphere of diameter: (iii) $3.5$ m
- Q3: Find the total surface area of a hemisphere of radius $10$ cm. (Use $\pi = 3.14$)
- Q4: The radius of a spherical balloon increases from $7$ cm to $14$ cm as air is being pumped into it. Find the ratio of surface areas of the balloon in the two cases.
- Q5: A hemispherical bowl made of brass has inner diameter $10.5$ cm. Find the cost of tin-plating it on the inside at the rate of ₹ $16$ per $100$ cm$^2$.
- Q6: Find the radius of a sphere whose surface area is $154$ cm$^2$.
- Q7: The diameter of the moon is approximately one fourth of the diameter of the earth. Find the ratio of their surface areas.
- Q8: A hemispherical bowl is made of steel, $0.25$ cm thick. The inner radius of the bowl is $5$ cm. Find the outer curved surface area of the bowl.
- Q9(i): A right circular cylinder just encloses a sphere of radius $r$ (see Fig. 11.10). Find (i) surface area of the sphere,
- Q9(ii): A right circular cylinder just encloses a sphere of radius $r$ (see Fig. 11.10). Find (ii) curved surface area of the cylinder,
- Q9(iii): A right circular cylinder just encloses a sphere of radius $r$ (see Fig. 11.10). Find (iii) ratio of the areas obtained in (i) and (ii).
Other Exercises for CBSE - Class 9 Mathematics Surface Area and Volumes
Chapters in CBSE - Class 9 Mathematics
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