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Newbie

## A right triangle whose sides are 15 cm and 20 cm other than hypotenuse, is made to revolve about its hypotenuse. Find the volume and surface area of the double cone so formed.

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In given problem choose value of π as found appropriate. This is one of the important question from the cbse board ...Read more

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Newbie

## A copper wire of diameter 6 mm is evenly wrapped on a cylinder of length 18 cm and diameter 49 cm to cover its whole surface. Find the length and the volume of the wire. If the density of the copper be 8.8 g per cm 3 , then find the weight of the wire.

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This is one of the important question as well as HOT question. Question number 33 from RS Aggarwal book page ...Read more

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Newbie

## In a corner of a rectangular field with dimensions 35 m ×22 m, a well with 14 m inside diameter is dug 8 m deep. The earth dug out is spread evenly over the remaining part of the field. Find the rise in the level of the field.

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Given problem is the HOT problem according to the cbse syllabus. Problem from RS Aggarwal book, problem number 32, page ...Read more

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Newbie

## In a village, a well with 10 m inside diameter, is dug 14 m deep. Earth taken out of it is spread all around to a width 5 m to form an embankment. Find the height of the embankment. What value of the villagers is reflected here?

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This is one of the important question from the cbse board exam point of view because in 2014 cbse board ...Read more

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Newbie

## Marbles of diameter 1.4 cm are dropped into a cylindrical beaker of diameter 7 cm, containing some water. Find the number of marbles that should be dropped into the beaker so that the water level rises by 5.6 cm.

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Problem from RS Aggarwal book, problem number 30, page number 812, exercise 17B, chapter volume and surface area of solid.Read more

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Newbie

## 150 spherical marbles, each of diameter 1.4 cm, are dropped in a cylindrical vessel of diameter 7 cm containing some water, which are completely immersed in water. Find the rise in the level of water in the vessel.

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In the given problem shape of the object is sphere to find answer of this question need to use sphere ...Read more

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Newbie

## Water running in a cylindrical pipe of inner diameter 7 cm, is collected in a container at the rate of 192.5 liters per minute. Find the rate of flow of water in the pipe in km/hr.

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In the given problem shape of the pipe is cylindrical to find answer of this question need to use cylinder ...Read more

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Newbie

## A farmer connects a pipe of internal diameter 25 cm from a canal into a cylindrical tank in his field, which is 12 m in diameter and 2.5 m deep. If water flows through the pipe at the rate of 3.6 km/hr, then in how much time will the tank be filled? Also, find the cost of water if the canal department charges at the rate of 0.07 per m³

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This question was asked in 2009 cbse board exam. Question from RS Aggarwal book chapter volume and surface area of ...Read more

• 0
Newbie

## Water in a canal, 5.4 m wide and 1.8 m deep, is flowing with a speed of 25 km/hr. How much area can it irrigate in 40 minutes, if 10 cm of standing water is required for irrigation?

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This is one of the important question from the cbse board exam point of view because in 2017 cbse board ...Read more

• -1
Newbie

## Water is flowing at the rate of 6 km/hr through a pipe of diameter 14 cm into a rectangular tank which is 60 m long and 22 m wide. Determine the time in which the level of water in the tank will rise by 7 cm.

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In given problem there is need to use time conversion. And the problem given from RS Aggarwal book, problem number ...Read more