Chapter 11 – Mensuration

114. Four times the area of the curved surface of a cylinder is equal to 6 times the sum of the areas of its bases. If its height is 12 cm, find its curved surface area. 114. Four times the area of the curved surface of a cylinder is equal to 6 times the sum [...]

113. From a pipe of inner radius 0.75 cm, water flows at the rate of 7 m per second. Find the volume in litres of water delivered by the pipe in 1 hour. 113. From a pipe of inner radius 0.75 cm water flows at the rate of 7 m per second. Find the volume [...]

112. A rectangular sheet of dimensions 25 cm × 7 cm is rotated about its longer side. Find the volume and the whole surface area of the solid thus generated. 112. A rectangular sheet of dimensions 25 cm × 7 cm is rotated about its longer side. Find the volume and the whole surface area [...]

111. What will happen to the volume of the cube, if its edge is (a) tripled (b) reduced to one-fourth? 111. What will happen to the volume of the cube if its edge is (a) tripled (b) reduced to one-fourth? August 10, 2021 Category: Chapter 11 - Mensuration , Maths , NCERT Class 8 ,

110. The capacity of a closed cylindrical vessel of height 1 m is 15.4 L. How many square metres of metal sheet would be needed to make it? 110. The capacity of a closed cylindrical vessel of height 1 m is 15.4 L. How many square metres of metal sheet would be needed to make [...]

109. External dimensions of a closed wooden box are in the ratio 5:4:3. If the cost of painting its outer surface at the rate of Rs 5 per dm^2 is Rs 11,750, find the dimensions of the box. 109. External dimensions of a closed wooden box are in the ratio 5:4:3. If the cost of [...]

108. The ratio of the radius and height of a cylinder is 2:3. If its volume is 12,936 cm^3, find the total surface area of the cylinder. 108. The ratio of the radius and height of a cylinder is 2:3. If its volume is 12 936 cm^3 find the total surface area of the cylinder. [...]

107. Metallic discs of radius 0.75 cm and thickness 0.2 cm are melted to obtain 508.68 cm^3 of metal. Find the number of discs melted (use π = 3.14). 107. Metallic discs of radius 0.75 cm and thickness 0.2 cm are melted to obtain 508.68 cm^3 of metal. Find the number of discs melted (use [...]

106. A housing society consisting of 5,500 people needs 100 L of water per person per day. The cylindrical supply tank is 7 m high and has a diameter 10 m. For how many days will the water in the tank last for the society? 106. A housing society consisting of 5 500 people needs [...]

105. A swimming pool is 200 m by 50 m and has an average depth of 2 m. By the end of a summer day, the water level drops by 2 cm. How many cubic metres of water is lost on the day? 105. A swimming pool is 200 m by 50 m and has [...]