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Chapter 13 Class 10 Surface Areas and Volumes
Example 3 Important
Ex 13.1, 4 Important
Ex 13.1, 9 Important
Example 6 Important
Example 7 Important
Example 9 Important Deleted for CBSE Board 2023 Exams
Example 11 Important Deleted for CBSE Board 2023 Exams You are here
Ex 13.3, 8 Important Deleted for CBSE Board 2023 Exams
Ex 13.3, 9 Important Deleted for CBSE Board 2023 Exams
Example 12 Important Deleted for CBSE Board 2023 Exams
Ex 13.4, 4 Important Deleted for CBSE Board 2023 Exams
Ex 13.4, 5 Important Deleted for CBSE Board 2023 Exams
Surface Area and Volume Formulas Important
Chapter 13 Class 10 Surface Areas and Volumes
Last updated at May 29, 2018 by Teachoo
Example 11 A hemispherical tank full of water is emptied by a pipe at the rate of 34/7 litres per second. How much time will it take to empty half the tank, if it is 3m in diameter?(Take = 22/7) Volume of tank Tank is in form of hemisphere with Diameter = 3m So, radius = r = 3/2 m Volume of the tank = 2/3 3 = 2/3 22/7 (3/2)^3 = 2/3 22/7 (3 3 3)/(2 2 2) = 99/14 m3 = 99/14 1000 litres = 99000/14 litres Volume of water to be emptied = 1/2 Volume of tank = 1/2 99000/14 litres = 99000/28 litres Now, it is given that tank is emptied at 34/7 litres per second = 25/7 litres per second Time taken to empty 25/7 litres = 1 second Time taken to empty 1 litre = 1 7/25 second Time taken to empty 99000/28 litre = 7/25 99000/28 = 693000/700 = 990 second = 990/60 minutes = 16.5 minutes