NCERT Class 8

119. The ratio between the curved surface area and the total surface area of a right circular cylinder is 1:2. Find the ratio between the height and radius of the cylinder. 119. The ratio between the curved surface area and the total surface area of a right circular cylinder is 1:2. Find the ratio between [...]

118. A rectangular examination hall having seats for 500 candidates has to be built so as to allow 4 cubic metres of air and 0.5 square metres of floor area per candidate. If the length of hall be 25 m, find the height and breadth of the hall. Example 5 : 1L = 1000 cm^3 [...]

117. How many bricks of size 22 cm × 10 cm × 7 cm are required to construct a wall 11m long, 3.5 m high and 40 cm thick, if the cement and sand used in the construction occupy (1/10)th part of the wall? 117. How many bricks of size 22 cm × 10 cm [...]

116. The length, breadth and height of a cuboidal reservoir is 7 m, 6 m and 15 m respectively. 8400 L of water is pumped out from the reservoir. Find the fall in the water level in the reservoir. 116. The length 6 m and 15 m respectively. 8400 L of water is pumped out [...]

115. A cylindrical tank has a radius of 154 cm. It is filled with water to a height of 3 m. If water to a height of 4.5 m is poured into it, what will be the increase in the volume of water in kl? 115. A cylindrical tank has a radius of 154 cm. [...]

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 [...]