Recent questions tagged chapter11

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Find the area to be painted in the following block with a cylindrical hole. Given that length is 15 cm, width 12 cm, height 20 cm and radius of the hole 2.8 cm.

asked Jan 17, 2022 in 8th-maths by krutika (1.7k points)

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A truck carrying 7.8 `m^3` concrete arrives at a job site. A platform of width 5 m and height 2 m is being contructed at the site. Find the length of the platform, constructed from the amount of concrete on the

asked Jan 17, 2022 in 8th-maths by vaibhav (1.7k points)

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A hollow garden roller of 42 cm diameter and length 152 cm is made of cast iron 2 cm thick. Find the volume of iron used in the

asked Jan 17, 2022 in 8th-maths by nishit (1.8k points)

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Three cubes each of side 10 cm are joined end to end. Find the surface area of the resultant

asked Jan 17, 2022 in 8th-maths by Arun (1.7k points)

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Below are the drawings of cross sections of two different pipes used to fill swimming pools. Figure A is a combination of 2 pipes each having a radius of 8 cm. Figure B is a pipe having a radius of 15 cm. If the force of the flow of water coming out of the pipes is the same in both the cases, which will fill the swimming pool faster?

asked Jan 17, 2022 in 8th-maths by Arun (1.7k points)

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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

asked Jan 17, 2022 in 8th-maths by Simran (1.8k points)

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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

asked Jan 17, 2022 in 8th-maths by yogita (1.8k points)

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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 =

asked Jan 17, 2022 in 8th-maths by sumit (1.6k points)

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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

asked Jan 17, 2022 in 8th-maths by krutika (1.7k points)

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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 d`m^2` is Rs 11,750, find the dimensions of the

asked Jan 17, 2022 in 8th-maths by purvi (1.8k points)

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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

asked Jan 17, 2022 in 8th-maths by purvi (1.8k points)

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What will happen to the volume of the cube, if its edge is (a) tripled (b) reduced to

asked Jan 17, 2022 in 8th-maths by Arun (1.7k points)

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A rectangular sheet of dimensions `25 cm xx 7 cm` is rotated about its longer side. Find the volume and the whole surface area of the solid thus

asked Jan 17, 2022 in 8th-maths by nikhil (1.8k points)

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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

asked Jan 17, 2022 in 8th-maths by uday (1.6k points)

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What is the area of the triangle ADE in the following figure?

asked Jan 17, 2022 in 8th-maths by nishit (1.8k points)

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What will be the change in the volume of a cube when its side becomes 10 times the original

asked Jan 17, 2022 in 8th-maths by krutika (1.7k points)

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Area of a rhombus is equal to __________ of its

asked Jan 17, 2022 in 8th-maths by Simran (1.8k points)

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If the area of a face of a cube is 10 `cm^2`, then the total surface area of the cube is

asked Jan 17, 2022 in 8th-maths by vaibhav (1.7k points)

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1L = 1000

asked Jan 17, 2022 in 8th-maths by nikhil (1.8k points)

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Amount of region occupied by a solid is called its surface

asked Jan 17, 2022 in 8th-maths by Arun (1.7k points)

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