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Syllabus

a cone of radius 10 cm is divided into two parts by drawing a plane through the midpoint of its axis , parallel to its base . compare the volume of the two parts

a farmer connects a pipe of internal diameter 20 cm from a canal into a cylindrical tank in his field , which is 10m in diameter and 2 m deep. If water flows through the pipe at the rate of 3km/hr , in how much time the tank be filled ?

A well of diameter 3m ,dug 14m deep. The earth taken out of it has been spread evenly all around it in the shape of a circular ring of width 4m to form an embankment. Find the height of the embankment.

The height of a cone is 30cm.A small cone is cut off at the top by a plane parallel to the base.If its volume be 1/27 of the volume of the given cone,then what is the height above the base at which the section is made?

water is flowing at the rate of 15km/hr through a pipe of diameter 14 cm into a rectangular tank which is 50m long and 44m wide . find the time in which the level of water in the tank will rise by 21 cm

A hollow cone is cut by a plane parallel to the base and the upper portion is removed. If the curved surface area of the remainder is 8/9th of the curved surface of the whole cone, find the ratio of the line segments into which the cone's altitude is divided by the plane.

^{3}of the metal is 1.2g. (use pie=22/7)a cylinder , a cone and a hemisphere of equal base have the same height. what is their ratio in their volumes ?

what is meant by surface area

is it tsa or csa??????

A hemispherical tank , full of water , is emptied by a pipe at the rate of 25/7 litres per second. How much time will it take to empty half the tank if the diameter of the base of the tank is 3 m ?

A solid right cone of diameter 14 cm and height 4 cm is melted to form a holow hemisphere .If the external diameter of the hemisphere is 10 cm,find its internal diameter.Also find the total surface area of the hemisphere

A cone of maximum size is carved out from a cube of edge 14cm . FInd out the surface area of the cone and of the remaining solid left out after the carved out . Plzz Answer ....

A right triangle whose sides are 15 cm and 20 cm is made to revolve about its hypoteneous.Find the volume and the surface area of the double cone so formed. (Take pie = 3.14

the rainwater from a roof 22m*20m drains into a cylindrical vessel having diameter of base 2 m and height 3.5m . if the vessel is just full , find the rainfall in cm.

pls do this problem in simple method

Q ) A solid in the form of a cone of height h, mounted on the top of a solid right circular cylinder of height 1/3 h. The circumference of the base of the cone and that of the cylinder are both equal to C . If V be the volume of the solid then prove that

C = 4 X square root of 3 pie V / 8 h

Urgently need the answer to the above question.total surface area of an hollow sphere and hemisphere?

question of the day

A right triangle whose sides are 15 cm and 20 cm is made to revolve about its

hypotenuse. Find the volume and surface area of the double cone so formed.

If the diameter of a sphere is decreased by 25%, then by what percent its curved area would decrease?

the barrel fountain pen cylindrical in shape is 7cm long and 5mm in diameter. a full barrel of ink in the pen is used up in writing 330 words

on an average.

how many words would use up a bottle of ink containing one fifth of a litre?

A sphere of diameter 12 cm is dropped in a right circular cylinder vessel partly filled with water. If the sphere is completely submerged in water, the water level in the cylindrical vessel rises by 32/9cm. find the diameter of the cylindrical vessel.

a copper wire 3mm in diameter ,is wound about a cylinder whose length is 12cm , and diameter 10cm so as to cover the csa of the cylinder . find the length and mass of the wire , assuming the density of copper to be 8.88g per cm3

a bucket made up of metal sheet is in the form of a frustum of a cone of height 16 cm with radii of its lower and upper ends as 8 cm and 20 cm respectively. find the cost of the bucket if the cost of the metal sheet is Rs. 15 per 100 cm

^{3 }( use pi= 22/7)A solid copper sphere of surface area 1386 cm sq. is melted and drawn into a wire of uniform cross section . If the lenght of the wire is 31.5 m , find the diameter of wire !!

if h,c,v are respectively the height, curved surface area and the volume of a cone.prove that

3 pie v h cube - c2h2 + 9v2 =0

A hemispherical depression is cut-out from one face of a cubical wooden block such that the diameter l of the hemisphere is equal to the edge of the cube. Determine the surface area of the remaining solid.

12 solid spheres of the same size are made by melting a solid metallic cylinder of base radius 1cm and height 1/3 of 48cm. The radius of each sphere is :

A) 4cm B) 3 cm C) 2cm D) 1cm

plz explain with steps............What is the CSA, TSA and volume of a frustum?

two cubes have their volumes in the ratio 8:125. what is the ratio of their surface areas?

The difference between the outer and inner curved surface areas of a hollow right circular cylinder, 14cm long, is 88cm2. If the volune of metal used in making the cylinder is 176cm3, find the outer and inner diameters of the cylinder

30. Jay Pravesh, a juice seller has set-up his juice shop. He has three types of glasses of inner diameter 5 cm to serve the customers. The height of the glasses is 10 cm. (Use = 3.14)

i) Find the volume of glass of type A.

(ii) Which glass has the minimum capacity ?

(iii) Which mathematical concept is used in above problem ?

(iv) By choosing a glass of type A, which value is depicted by juice seller ?

a sphere of diameter 6cm is dropped in a right circular cylindrical vessel partly filled with water . the diameter of the cylindrical vessel is 12cm. if sphere is completely submerged in water by how much will the level of water rise?

a cylindrical tomb 3.5 m in outer radius has a hemispherical roof. find the cost of painting the tomb's exterior at the rate of rs 2 per m sq if the total height of the tomb is 8 m

A conical vessel of radius 6cm and height 8cm is completely filled with water. A spere is lowered into the water and its size is such that when it touches the sides, it is just immersed. What fraction of water overflows?

1. a right triangle whose sides are 15cm and 20cm is made to revolve about its hypotenuse. find the volume of the double cone so obtained.

2. marbles of diameter 1.4cm are dropped into a cylindrical beaker of diameter 7cm containing some water. find the no. of marbles dropped so that the watre level rises by 5.6cm.

a bucket i sin the form of frustum with the capacity of 12308.8 cm cube.the radii of the top and bottom of circular ends are 12 cm and 20 cm resp.find the hieght of the bucket and also the area of metal sheets used in making the bucket.(use pie=3.14)

Two cubes each of side 4cm are joined end to end.Find the surface area of the resulting cuboid

A well of diameter 3m, is dug 14m deep The earth taken out of it has been evenly spread all around it to a width of 4m, to form an embankment Find the height of the embankment use pi=22/7

examples of combination of solids in day to day life. could u give some 25 to 50 objects. example like ice cream and capsule

If the diameter of the cross section of the wire is decreased by 5%,how much %will the length be increased so that the volume remains the same

A solid is in the form of the cone mounted on the hemisphere is such a way that the center of the base of the cone just coincide with the center of the base of the hemisphere .Slant hieght of the cone is L and radius of the base of the cone is 1/2 r ,where r is the radius of the hemisphere .Prove that the total surface area of the solid is pi / 4 11r + 2l r square units.

A toy in the shape of solid cylinder surmounted by a conical top.If the height of the diameter of the cylinder path are 21cm and 40cm respectively and height of the cone is 15cm.Find the total surface area of the toy. use pie=3.14

A shuttle cock used for playing badminton has the shape of a frustum of a cone mounted on a hemisphere (see figure). The diameters of the ends of the frustum are 5 cm and 2 cm , the height of the entire shuttle cock is 7 cm. Find the external surface area. (Take Pie=22/7) .

The interior of building is in the form of a cylinder of diameter 4m and height 3.5m ,surmounted by a cone of the same base with vertical angle as a right angle. Find the surface area (curved) and volume of the interior of the building.

A cone, a hemisphere and a cylinder stand on equal bases and have the same height. Find the ratio of their volumes>

From a solid cylinder whose height is 2.4 cm and diameter 1.4 cm, a conical cavity of the same height and same diameter is hollowed out. Find the total surface area of the remaining solid to the nearest cm

^{2}.Given that,

Height (

h) of the conical part = Height (h) of the cylindrical part = 2.4 cmDiameter of the cylindrical part = 1.4 cm

Therefore, radius (

r) of the cylindrical part = 0.7 cmTotal surface area of the remaining solid will be

= CSA of cylindrical part + CSA of conical part + Area of cylindrical base

The total surface area of the remaining solid to the nearest cm

^{2}is 18 cm^{2}.Why C.S.A. of cone is added instead of subtracting(cause we have to find T.S.A. of remaining part)???

plz explain

^{2 }.Find the perimeters and areas of the 2 regions.The interior of a building is in the form of a cylinder of diameter 4.3m and height 3.8m, surmounted by a cone whose vertical angle is a right angle. Find the area of the surface and volume of the building.

An ice cream seller has two types of ice cream container in the form of

The height of right circular cone is trisected by two plane parallel to its base. Show that the volume of the three propotion from top are in ratio 1:7:19.

structure made from struts set on large circles. Because of its curved

walls and ceiling, these domes use approximately a third less surface

area to enclose the same volume as a traditional box home.

(a) A hollow model of similar type of a structure is constructed with a

hemisphere mounted on the cylinder.

Figure 1

If height of cylindrical part is 6 cm, and total height of the model is 13 cm, then

find the radius of hemisphere.

(i) 5 cm (ii) 3 cm (iii) 7 cm (iv) 4 cm

(b) A square band of side 17 cm is put outside along the edge of the

hemisphere as shown in figure 1. Find the area of metal sheet required for

A swimming pool is filled by 3 pipes with uniform flow, The first two pipes operating simultaneously, fill the pool in the same time during which the pool is filled by the 3

^{rd}pipe alone. The 2^{nd}pipe fills the pool 5 hours faster than the 1^{st}pipe & 4 hours slower than the 3^{rd}pipe. Find the time required by each pipe to fill the pool separately.cost of painting the total outside surface of a closed cylindrical oil tank at 60 paise per sq. dm is rs.237.60 . the heigth of the tank is 6 times the radius of the base of tank . find its volume correct to two decimal point...? and is que. in easy

a social organisation decided to plant 100 plants in a rectangular park of dimensions 31.15m*4.40m.to perform this activity 2 types of plants were selected one plant covrd an area of dia 56cm and the other type covrd an area of 35cm in dia.the uncovrd area is 4 times the covrd area

1)find the no of plants of each type?

A gulab jamun, contains sugar syrup up to about 30% of its volume. Find approximately how much syrup would be found in 45 gulab jamuns, each shaped like a cylinder with two hemispherical ends with length 5 cm and diameter 2.8 cm (see the given figure).

t can be observed that

Radius (

r) of cylindrical part = Radius (r) of hemispherical part =Length of each hemispherical part = Radius of hemispherical part = 1.4 cm

Length (

h) of cylindrical part = 5 − 2 × Length of hemispherical part= 5 − 2 × 1.4 = 2.2 cm

Volume of one gulab jamun = Vol. of cylindrical part + 2 × Vol. of hemispherical part

Volume of 45 gulab jamuns == 1,127.25 cm

^{3}Volume of sugar syrup = 30% of volume

plz tell me why it is voulume of gulab jamun is taken to find the sugar suyrup. why we can't take area of gulab jamun in the place volume because container contain gulab jamun we can take their area and then the volume of container. im not able to understand the question. please try to explain with proper diagram.

Water is flowing at the rate of 3km/hr through a circular pipe of 20cm internal diameter into a circular cistern of diameter 10m and depth 2m.In how much time will the cistern be filled? Also, plzz tell that here what is meant by cistern?????

The ratio of the total surface area of a solid hemisphere to the square of its radius is:

plz explain

A cylindrical copper rod of diameter 1 cm and length 8 cm is drawn into a cylindrical wire of length 18 m and of unifiorm thickness. Find the thickness of the wire.

A tent is in the shape of a cylinder surmounted by a conical top. If the height and diameter of the cylindrical part are 2.1 m and 4 m respectively, and the slant height of the top is 2.8 m, find the area of the canvas used for making the tent. Also, find the cost of the canvas of the tent at the rate of Rs 500 per m

^{2}. (Note that the base of the tent will not be covered with canvas.)Q2) Mr. Harish donates some part of his income to orphanage every month. In a particular, he wishes to donate toys for the children. each toy is in the form of a cone mounted on a hemisphere of common base of radius 7 cm. The total height of the toy is 31 cm.

a) Find the cost of 50 such toys if the cost of material used in the toy is Rs.5 per 100 cm

^{2}and the cost of making is Rs.10 per toy.b) What values is shown by Mr.Harish in the above problem ? (Ans: Rs.2645 , kindness )

find the area of the shaded region where ABCD is a square of side 14cm . ( four equal circle inside the square) . And please explain me how the radius is obtained .

the derivatio of the formula of frustum of cone

A container, opened from the top and made up of a metal sheet, is in the form of a frustum of a cone of height 16 cm with radii of its lower and upper ends as 8 cm and 20 cm respectively. Find the cost of the milk which can completely fill the container, at the rate of Rs.20 per litre. Also find the cost of metal sheet used to make the container, if it costs Rs.8 per 100 cm

^{2}. [Take π = 3.14]the diameter of a cycle wheel is 21 cm. how many revolutions willl it make to travel 1.98 km? plsssssssss answer soon

in one fortnight of a given month ,there was a rainfall of 10cm in a river valley .if the area of the valley is 97280 km sq. ,show that the total rainfall was approx. equivalent to the addition to the normal water of the three rivers each ,1072 km long ,75m wide and 3m deep.

PLEASE HELP THIS ANSWER IS NOT AVAILABLE ON MERITNATION NCERT SOLUTION.

How to derive the formula for voulume of frustum of a cone?

- How to derive the relation bnetween the orginal cone radius / height to the portion of the cone that is removed?

Water is flowing through a cylindrical pipe, of internal diameter 2cm, into a cylindrical tank of base radius 40cm, at the rate of 0.4m/s. Determine the rise in level of water in the tank in half an hour.

Marbles of diameter 1.4 cm are dropped into a cylindrical beaker of diameter 7cm containing some water. Find the number of marbles that should be dropped into the beaker so that the water level rises by 5.6cm??(please explain step-wise) :))A container shaped like a right circular cylinder having diameter 12 cm and height 15 cm is full of ice cream. The ice cream is to be filled into cones of height 12 cm and diameter 6 cm, having a hemispherical shape on the top. Find the number of such cones which can be filled with ice cream

If a metallic cube of edge 1 cm is drawn into a wire of diameter 4 mm, then the length of the

wire is :A solid toy is in the form of a hemisphere surmounted by a right circular cone.Height of the cone is 2cm and the diameter is 4cm. If a right circular cylinder circumscribes the solid,find how much more space it will cover.