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Question 9: A right circular cylinder just encloses a sphere of radius r (see Fig. 13.22). Find surface area of the sphere curved surface area of the cylinder ratio of the areas obtained in (i) and (ii) Question 8 Ex:…
Read MoreQuestion 8: 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. Question 7 Question 9
Read MoreQuestion 7: The diameter of the moon is approximately one fourth of the diameter of the earth. Find the ratio of their surface areas. Question 6 Question 8
Read MoreQuestion 6: Find the radius of a sphere whose surface area is 154 cm2. Question 5 Question 7
Read MoreQuestion 5: 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 cm2. Question 4 Question 6
Read MoreQuestion 4: 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. Question 3 Question 5
Read MoreQuestion 3: Find the total surface area of a hemisphere of radius 10 cm. (Use π = 3.14) Question 2 Question 4
Read MoreQuestion 2: Find the surface area of a sphere of diameter: (i) 14cm (ii) 21cm (iii) 3.5m Question 1 Question 3
Read MoreQuestion 1: Find the surface area of a sphere of radius: (i) 10.5cm (ii) 5.6cm (iii) 14cm Ex: 13.3 | Question 8 Question 2
Read MoreQuestion 9: A river 3m deep and 40m wide is flowing at the rate of 2km per hour. How much water will fall into the sea in a minute? Question 8 Ex: 13.6 | Question 1
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