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    NCERT Solutions For Class 8 Maths Chapter 11 Mensuration

    Edited By Ramraj Saini | Updated on Oct 09, 2023 05:44 PM IST

    NCERT Solutions For Class 8 Maths Chapter 11 Mensuration

    Mensuration Class 8 Questions And Answers provided here. These NCERT Solutions are prepared by expert team considering the latest syllabus and pattern of CBSE 2023-24. In this chapter, you will study different geometrical shapes like circle, quadrilateral, triangle, cube, cuboid, sphere, cylinder, cone and their area and volume. Also, you will learn to find area of polygon, area of trapezium, area of general quadrilaterals and special quadrilaterals. In NCERT solutions for Class 8 Maths chapter 11 Mensuration, you will find questions related to finding area and volume 3D shapes.

    There are 4 exercises with 34 questions in this chapter. All these questions are explained in NCERT solutions for Class 8 Maths chapter 11 Mensuration in a detailed manner using diagrams. It is easy for you to visualize and understand the problem. Only using the formulas and finding the answer is not enough, you should know how these formulas are derived so you can find the area or volume of the new shape you may come across. Here you will get the detailed NCERT Solutions for Class 8 Maths by clicking on the link.

    Mensuration Class 8 Questions And Answers PDF Free Download

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    Mensuration Class 8 Solutions - Important Formulae

    Perimeter: The length of the outline of any simple closed figure is known as the perimeter.

    • Perimeter of a Rectangle: 2 × (Length + Breadth)

    • Perimeter of a Square: 4 × Side

    • Perimeter of a Circle (Circumference): 2πr (where r is the radius of the circle)

    • Perimeter of a Parallelogram: 2(Base + Height)

    • Perimeter of a Triangle: a + b + c (where a, b, and c are the side lengths)

    • Perimeter of a Trapezium: a + b + c + d (where a, b, c, and d are the sides of a trapezoid)

    • Perimeter of a Kite: 2a + 2b (where a is the length of the first pair of sides and b is the length of the second pair)

    • Perimeter of a Rhombus: 4 × Side

    • Perimeter of a Hexagon: 6 × Side

    Curved Surface Area of a Cone: πrl, where 'r' is the base radius and 'l' is the slant height. l = √(r2 + h2).

    Volume of a Cuboid: Base Area × Height = Length × Breadth × Height

    Volume of a Cone: (1/3)πr2h

    Volume of a Sphere: (4/3)πr3

    Volume of a Hemisphere: (2/3)πr3

    Free download NCERT Solutions for Class 8 Maths Chapter 11 Mensuration for CBSE Exam.

    Mensuration Class 8 NCERT Solutions (Intext Questions and Exercise)

    Class 8 mensuration ncert solutions - Topic 11.2 Let Us Recall

    Question:(a) Match the following figures with their respective areas in the box.

    45454578 1643870847806

    Answer:

    1.

    1643870897163

    Area of above shape = (\pi \times 7^{2})\div 2 = 77 cm^{2}

    1643870896823

    Area of above shape = 14\times 7 = 98cm^{2}

    1643870896187

    Area of above shape = 7\times 7 = 49cm^{2}

    1643870894567

    Area of above triangle = \frac{1}{2}\times 14\times 7=49cm^{2}

    1643870911717

    Area of above shape = b*h =

    14\times 7=98cm^{2}

    Question:(b) Write the perimeter of each shape.

    45454578


    1643871037982

    Answer:

    2.

    1643871007420

    Perimeter of shape = \pi \times r + 2\times r=\pi \times 7+2\times 7=36cm

    1643871007699

    perimeter of shape = 2\left ( l+ b \right )= 2\left ( 14+ 7 \right ) = 42 cm

    1643871008242

    perimeter of shape = 4\times side= 4\times 7=28cm

    1643871008617

    perimeter of shape = 14+11+9=34cm

    1643871074104

    perimeter of this shape cannot be calculated only with height and breadth,we need slant height or angle.

    Screenshot%20(75) Answer:

    Given:

    Perimeter of square = perimeter of rectangle

    \Rightarrow 4\times side = 2(length + breadth)

    \Rightarrow 4\times 60 = 2(80 + breadth)

    \Rightarrow 240\div 2=(80+breadth)

    \Rightarrow 120=(80+breadth)

    \Rightarrow (breadth)=120-80

    \Rightarrow (breadth)=40

    Area of square = side^{2}= 60^{2}=3600 m^{2}

    Area of rectangle = = (length\times breadth)=80\times 40=3200m^{2}

    Hence, the area of the square is greater than the area of the rectangle.

    Question:3 The shape of a garden is rectangular in the middle and semi-circular at the ends as shown in the diagram. Find the area and the perimeter of this garden [Length of rectangle is 20 – (3.5 + 3.5) metres]. 1643871256807 Answer:

    Length of rectangle is 20 – (3.5 + 3.5) metres=13 metres

    Breadth of rectangle = 7 metres

    diameter of circular side = 7metres

    Area of garden = area of rectangle + 2 times area of semi circular part

    Area of garden

    =\left ( 13\times 7 \right ) + \left ( \pi \times 7^{2}\div 4 \right )

    =129.5 metres^{2}

    Perimetre of garden

    =\left ( 2\times \pi \times r \right )+\left ( 2\times 13 \right )

    =\left ( 22 \right )+\left ( 26 \right )

    =48 metres

    NCERT Solutions for Class 8 Maths Chapter 11 Mensuration - Topic 11.3 Area Of Trapezium

    Question:1 Nazma’s sister also has a trapezium-shaped plot. Divide it into three parts as shown (Fig 11.4). Show that the area of a trapezium

    WXYZ=h\frac{(a+b)}{2} .

    2323

    Answer:

    Area of trapezium WXYZ = Area of triangle with base 'c' + area of rectangle + area of triangle with base'd'

    =(\frac{1}{2}\times c\times h)+(b\times h)+\left ( \frac{1}{2}\times d\times h \right )

    Taking 'h' common, we get

    =(\frac{c}{2}+b+\frac{d}{2})h

    =h(\frac{c+d}{2}+b)

    Replacing c+d =a-b

    =h(\frac{a-b}{2}+b)

    =h(\frac{a+b}{2})

    Hence proved that the area of a trapezium

    WXYZ=h\frac{(a+b)}{2}

    Question:2 If h = 10 cm, c = 6 cm, b = 12 cm, d = 4 cm, find the values of each of its parts separetely and add to find the area WXYZ. Verify it by putting the values of h, a and b in the expression \frac{h(a+b)}{2} .

    2323

    Answer:

    2323

    Area of trapezium WXYZ = Area of traingle with base'c'+area of rectangle +area of triangle with base 'd'

    =\left ( \frac{1}{2}\times c\times h \right )+\left ( b\times h \right )+\left ( \frac{1}{2}\times d\times h \right )

    =\left ( \frac{1}{2}\times 6\times 10 \right )+\left ( 12\times 10 \right )+\left ( \frac{1}{2}\times 4\times 10 \right )

    =\left ( 30 \right )+\left ( 120 \right )+\left ( 20 \right )

    =170 cm^{2}

    the area WXYZ by the expression

    . \frac{h(a+b)}{2}

    =\frac{10 \left ( 22+12 \right )}{2}

    =\frac{10 \left ( 34 \right )}{2}

    =10\times 17

    =170 cm^{2}

    Hence,we can conclude area from given expression and calculated area is equal.

    NCERT Solutions for Class 8 Maths Chapter 11 Mensuration - Topic 11.3 Area of Trapezium

    Question:1 Find the area of the following trapeziums (Fig 11.8)

    1643871315672 252533

    Answer:

    (i) Area of trapezium

    =\frac{1}{2}\ (Sum\: of\: Parallel\: sides)\times (Distance\: between \:parallel \:sides)

    =\frac{1}{2}\times 16\times 3

    =27cm^{2}

    (ii)

    Area of trapezium

    =\frac{1}{2}\ (Sum\: of\: Parallel\: sides)\times (Distance\: between \:parallel \:sides)

    =\frac{1}{2}\times (10+5)\times 6

    =45 cm^{2}

    NCERT Solutions for Class 8 Maths Chapter 11 Mensuration - Topic 11.4 Area Of A General Quadrilateral

    Question:1 We know that parallelogram is also a quadrilateral. Let us also split such a quadrilateral into two triangles, find their areas and hence that of the parallelogram. Does this agree with the formula that you know already? (Fig 11.12)

    1643871374343 Answer:

    115484

    Area \:of \:quadrilateral \:ABCD = Area \:of( \bigtriangleup ABD \:+\:\bigtriangleup BCD)

    =\left ( \frac{1}{2}\times b\times h \right )+\left ( \frac{1}{2}\times b\times h \right )

    =bh

    This agree with the formula that we know already.

    NCERT Solutions for Class 8 Maths Chapter 11 Mensuration - Topic 11.4.1 Area Of A Special Quadrilaterals

    Question:1 Find the area of these quadrilaterals (Fig 11.14).

    15115165165

    Answer:

    (i) Area=

    =\frac{1}{2}\times d\left ( h1+h2 \right )

    =\frac{1}{2}\times 6\times \left ( 3+5 \right )

    =3\times \left ( 8 \right )

    =24 cm^{2}

    (ii) Area=

    =\frac{1}{2}\times d1\times \left ( d2 \right )

    =\frac{1}{2}\times 7\times \left ( 6 \right )

    = 7\times \left (3 \right )

    = 21 cm^{2}

    (iii)Area=

    =\frac{1}{2}\times d\left ( h1+h2 \right )

    =\frac{1}{2}\times 8\times \left ( 2+2 \right )

    =4\times 4

    =16 cm^{2}

    NCERT Solutions for Class 8 Maths Chapter 11 Mensuration - Topic 11.5 Area Of A Polygon

    Question:(i) Divide the following polygons (Fig 11.17) into parts (triangles and trapezium) to find out its area.

    16438714089291643871436209

    FI is a diagonal of polygon EFGHI NQ is a diagonal of polygon MNOPQR

    Answer:

    (i)

    Area of polygon EFGHI = area of \triangle EFI + area of quadrilateral FGHI

    Draw a diagonal FH

    Area of polygon EFGHI = area of \triangle EFI + area of \triangle FGH + area of \triangle FHI

    ii)

    Area of polygon MNOPQR = area of quadrilateral NMRQ+area of quadrilateral NOPQ

    Draw diagonal NP and NR .

    Area of polygon MNOPQR = area of \triangle NOP+area of \triangle NPQ +area of \triangle NMR +area of \triangle NRQ

    Question:(ii) Polygon ABCDE is divided into parts as shown below (Fig 11.18). Find its area if AD = 8 cm , AH = 6 cm , AG = 4 cm , AF = 3 cm and perpendiculars BF = 2 cm , CH = 3 cm , EG = 2.5 cm . Area of Polygon ABCDE = area of \Delta AFB+...

    Area of \Delta AFB=\frac{1}{2}\times AF\times BF=\frac{1}{2}\times 3\times 2=....

    Area of trapezium FBCH=FH\times \frac{(BF+CH)}{2}

    =3\times \frac{(2+3)}{2}[FH=AH-AF]

    Area of \Delta CHD=\frac{1}{2}\times HD\times CH=....., Area of \Delta ADE=\frac{1}{2}\times AD\times GE=...

    So, the area of polygon ABCDE = ....

    2525233

    Answer:

    2525233

    Area of Polygon ABCDE = area of \traingle\bigtriangleup AFB + area of trapezium BCHF + area of \traingle\bigtriangleup CDH+area of \traingle\bigtriangleup AED =(\frac{1}{2}\times AF\times BF)+\left ( FH\times \left ( BF+CH \right )\div 2 \right )+(\frac{1}{2}\times HD\times CH)+(\frac{1}{2}\times AD\times EG)

    =(\frac{1}{2}\times 3\times2)+\left ( 3\times \left ( 2+3 \right )\div 2 \right )+(\frac{1}{2}\times 2\times 3)+(\frac{1}{2}\times 8\times2.5)

    = 3+7.5+3+10

    =23.5 cm^{2}

    Question:(iii) Find the area of polygon MNOPQR (Fig 11.19) if MP = 9 cm , MD = 7 cm , MC = 6 cm , MB = 4 cm , MA = 2 cm NA, OC, QD and RB are perpendiculars to diagonal MP.

    1643871560644

    Answer:

    the area of polygon MNOPQR

    = area of \triangle MAN + area of trapezium ACON+area of \triangle CPO + area of \triangle MBR+area of trapezium BDQR+area of \triangle DPQ

    =(\frac{1}{2}\times 2\times 2.5)+(4(2.5+3)\div 2)+(\frac{1}{2}\times 3\times 3)+(\frac{1}{2}\times 4\times 2.5)+(3(2.5+2)\div 2)+(\frac{1}{2}\times 2\times 2)

    =2.5+11+4.5+5+6.75+2

    =31.75 cm^{2}

    Question:2 The area of a trapezium is 34 cm^{2} and the length of one of the parallel sides is 10 cm and its height is 4 cm . Find the length of the other parallel side.

    Answer:

    Let the length of the other parallel side be x

    area of a trapezium =

    =\frac{1}{2}\times \left ( 10+x \right )\times 4=34

    = \left ( 10+x \right )=17

    x=17-10

    x=7 cm

    Hence,the length of the other parallel side is 7cm

    Question:3 Length of the fence of a trapezium shaped field ABCD is 120 m . If BC = 48 m , CD = 17 m and AD = 40 m , find the area of this field. Side AB is perpendicular to the parallel sides AD and BC .

    1643871610276

    Answer:

    BC = 48 m , CD = 17 m and AD = 40 m ,

    Length of the fence of a trapezium shaped field ABCD = 120 m = AB+BC+CD+DA

    120=AB+48+17+40

    AB=15m

    Area of trapezium =

    \frac{1}{2}\times sum \, of\, parallel\, sides\times height

    =\frac{1}{2}\times (40+48)\times 15

    =\frac{1}{2}\times (88)\times 15

    = (44)\times 15

    =660m^{2}

    Question:4 The diagonal of a quadrilateral shaped field is 24 m and the perpendiculars dropped on it from the remaining opposite vertices are 8 m and 13 m. Find the area of the field. 1643871642365

    Answer:

    The diagonal of a quadrilateral shaped field is 24 m

    the perpendiculars are 8 m and 13 m.

    the area of the field =

    \frac{1}{2}\times d\times (h1+h2)

    =\frac{1}{2}\times 24\times (13+8)

    =12\times 21

    =252 m^{2}

    Question:6 Find the area of a rhombus whose side is 5 cm and whose altitude is 4.8 cm. If one of its diagonals is 8 cm long, find the length of the other diagonal.

    Answer:

    Rhombus is a type of parallelogram and area of parallelogram is product of base and height.

    So,Area of rhombus = base \times height

    = 5\times 4.8

    = 24

    Let the other diagonal be x

    Area of rhombus =

    =\frac{1}{2}\times product\, of\, diagonals

    24=\frac{1}{2}\times8\times x

    x=6cm

    Question:8 Mohan wants to buy a trapezium shaped field. Its side along the river is parallel to and twice the side along the road. If the area of this field is 10500 m^{2} and the perpendicular distance between the two parallel sides is 100 m, find the length of the side along the river.

    2626

    Answer:

    Let the length of the side along road be x m.

    Then according to question, lenght of side along river will be 2x m.

    Area \:of \:trapezium = \frac{1}{2}h(a+b)

    So equation becomes :

    \frac{1}{2}100(x+2x) = 10500

    or 3x = 210

    or x = 70

    So the length of the side along the river is 2x = 140m.

    Question:9 Top surface of a raised platform is in the shape of a regular octagon as shown in the figure. Find the area of the octagonal surface . 1643871675480 Answer:

    Area of octagonal surface = Area of rectangular surface + 2(Area of trapezium surface)

    Area of recatangular surface = 11\times5 = 55 m^2

    Area of trapezium surface =

    \frac{1}{2}\times4(11+5) = 2\times16 = 32 m^2

    So total area of octagonal surface = 55 + 2(32) = 55 + 64 = 119 m^2

    Question:10 There is a pentagonal shaped park as shown in the figure. For finding its area Jyoti and Kavita divided it in two different ways.

    3636333

    Find the area of this park using both ways. Can you suggest some other way of finding its area?

    Answer:

    Area of pentagonal park according to Jyoti's diagram :-

    = 2(Area of trapezium) = 2(\frac{1}{2}\times\frac{15}{2}\times45) = \frac{15\times45}{2} = 337.5 m^2

    Area of pentagonal park according to Kavita's diagram :-

    = Area of triangle + Area of square.

    = \frac{1}{2}\times15\times15 + 15\times15 = 112.5 + 225 = 337.5 m^2

    Question:11 Diagram of the adjacent picture frame has outer dimensions = 24 cm \times 28 cm and inner dimensions 16 cm \times 20 cm . Find the area of each section of the frame, if the width of each section is same.

    356356

    Answer:

    Area of opposite sections will be same.

    So area of horizontal sections,

    =\frac{1}{2}\times4(16+24) = 2(40) = 80\ cm^2

    And area of vertical sections,

    = \frac{1}{2}\times8(20+28) = 4(48) = 96\ cm^2

    NCERT Solutions for Class 8 Maths Chapter 11 Mensuration - Topic 11.7.1 Cuboid

    Question:1 Find the total surface area of the following cuboids (Fig 11.31):

    3563

    Answer:

    (i) Total surface area = 2 (h × l + b × h + b × l) = 2(lb + bh + hl)

    =2(6\times4 + 4\times2+6\times2) = 2(24+8+12)

    = 2(24+8+12) = 88\ cm^2

    (ii) Total surface area = 2 (h × l + b × h + b × l) = 2(lb + bh + hl)

    = 2(4\times4+4\times10+10\times4) = 2(16 + 40+40)

    = 2(96) = 192\ cm^2

    NCERT Solutions for Class 8 Maths Chapter 11 Mensuration - Topic 11.7.2 Cube

    Question: Find the surface area of cube A and lateral surface area of cube B (Fig 11.36).

    1643871700324

    Answer:

    Surface area of cube A = 6l^2

    = 6(10)^2 = 600\ cm^2

    Lateral surface area of cube B = 4l^2

    =4(8)^2 = 4\times64 = 256\ cm^2

    NCERT Solutions for Class 8 Maths Chapter 11 Mensuration - Topic 11.7.3 Cylinders

    Question:1 Find the total surface area of the following cylinders following figure

    365

    Answer:

    Total surface area of cylinder = 2πr (r + h)

    (i) Area =

    2\Pi \times14(14+8) = 2\Pi\times 14(22) = 1935.22\ cm^2

    (ii) Area =

    2\Pi \times1(1+2) = 2\Pi\times 1(3) = 18.84\ cm^2

    NCERT Solutions for Class 8 Maths Chapter 11 Mensuration-Exercise: 11.3

    Question:1 There are two cuboidal boxes as shown in the adjoining figure. Which box requires the lesser amount of material to make?

    1659338580356

    Answer:

    Surface area of cuboid (a) = 2(60\times40 + 40\times50 + 50\times60) =14800\ cm^2

    Surface area of cube (b) = 6(50)^2 = 15000\ cm^2

    So box (a) requires the lesser amount of material to make.

    Question:2 A suitcase with measures 80 cm \times 48 cm \times 24 cm is to be covered with a tarpaulin cloth. How many metres of tarpaulin of width 96 cm is required over 100 such suitcases?

    Answer:

    Surface area of suitcase = 2(80\times48+48\times24+24\times80) = 13824\ cm^2 .

    Area of such 100 suitcase will be 1382400\ cm^2

    So lenght of tarpaulin cloth = \frac{1382400\ cm^2 }{96\ cm} = 14400\ cm\ or\ 144m

    Question:3 Find the side of a cube whose surface area is 600 cm^{2} .

    Answer:

    Surface area of cube =\ 6l^2

    So, 6l^2 = 600

    or l^2 = 100

    or l = 10\ cm .

    Thus side of cube is 10 cm.

    Question:4 Rukhsar painted the outside of the cabinet of measure 1 m \times 2 m \times 1.5 m . How much surface area did she cover if she painted all except the bottom of the cabinet.

    456

    Answer:

    Required area = Total area - Area of bottom surface

    Total area = 2(1\times2+ 2\times1.5 + 1.5\times1 ) = 13\ m^2

    Area of bottom surface = 1\times2 = 2\ m^2

    So required area = 13-2\ m^2 = 11\ m^2

    Question:5 Daniel is painting the walls and ceiling of a cuboidal hall with length, breadth and height of 15 m, 10 m and 7 m respectively. From each can of paint 100 m^{2} of area is painted. How many cans of paint will she need to paint the room?

    Answer:

    Total area painted by Daniel :

    = 2(15\times10+10\times7+7\times15) - 15\times10 ( \because Bottom surface is excluded.)

    So, Area

    = 650 - 150\ m^2 = 500\ m^2

    No. of cans of paint required

    =\frac{ 500\ m^2}{100\ m^2} = 5

    Thus 5 cans of paint are required.

    Question:6 Describe how the two figures at the right are alike and how they are different. Which box has a larger lateral surface area?

    1659338695497

    Answer:

    The two figures have same height.The diference between them is one is cylinder and another is cube.

    lateral surface area of cylinder = 2\times \pi \times r\times h

    =2\times \pi \times 3.5\times 7

    =154 cm^{2}

    lateral surface area of cube = 4\times side^{2}

    =4\times 7^{2}

    =4\times 49

    =196 cm^{2}

    Cube has a larger lateral surface area.

    Question:8 The lateral surface area of a hollow cylinder is 4224 cm^{2} . It is cut along its height and formed a rectangular sheet of width 33 cm . Find the perimeter of rectangular sheet?

    Answer:

    Lenght of rectangular sheet

    = \frac{4224}{33} = 128\ cm

    So perimeter of rectangular sheet = 2(l + b)

    = 2(128 + 33) = 322\ cm .

    Thus perimeter of rectangular sheet is 322 cm.

    NCERT class 8 maths ch 11 question answer - Topic 11.8.1 Cuboid

    Question:1 Find the volume of the following cuboids 1643871835132

    Answer:

    (i) Volume of cuboid is given as:

    Volume\ of\ cuboid = length\times breadth\times height ,

    So, Given that Length = 8cm, Breadth = 3cm, and height = 2 cm so,

    its volume will be = 8cm\times 3cm\times 2cm = 48cm^3 .

    Aslo for Given Surface area of cuboid 24m^2 and height = 3 cm we can easily calculate the volume:

    Volume = Surface\ area\times height ;

    So, Volume = Volume = 24m^2\times \frac{3m}{100} = 0.72m^3

    NCERT Solutions for Class 8 Maths Chapter 11 Mensuration - Topic 11.8.2 Cube

    Question: Find the volume of the following cubes

    (a) with a side 4 cm (b) with a side 1.5 m

    Answer:

    (a) Volume of cube having side equal to 4cm will be

    Volume = Side\times side\times side or Volume = 4cm\times 4cm\times 4cm= 64cm^3 .

    (b) When having side length equal to 1.5m then ,

    Volume = 1.5m\times 1.5m\times 1.5m= 3.375m^3 .

    NCERT Solutions for Class 8 Maths Chapter 11 Mensuration - Topic 11.8.3 Cylinder

    Question:1 Find the volume of the following cylinders. 1643871864048

    Answer:

    (i) The volume of a cylinder given as = \Pi \times r^2\times length .

    or given radius of cylinder = 7cm and length of cylinder = 10cm.

    So, we can calculate the volume of the cylinder = \Pi \times (7cm)^2\times 10cm (Take the value of \Pi = \frac{22}{7} )

    The volume of cylinder = 1,540 cm^3 .


    (ii) Given for the Surface area = 250m^2 and height = 2m .

    we have .

    Volume\ of\ cylinder = 250m^2\times 2m = 500m^3.

    NCERT Solutions for Class 8 Maths Chapter 11 Mensuration-Exercise: 11.4

    Question:1(a) Given a cylindrical tank, in which situation will you find surface area and in
    which situation volume.

    To find how much it can hold.

    Answer:

    (a) To find out how much the cylindrical tank can hold we will basically find out the volume of the cylinder.

    Question:1(b) Given a cylindrical tank, in which situation will you find surface area and in
    which situation volume.

    Number of cement bags required to plaster it.

    Answer:

    (b) if we want to find out the cement bags required to plaster it means the area to be applied, we then calculate the surface area of the bags .

    Question:1(c) Given a cylindrical tank, in which situation will you find surface area and in
    which situation volume.

    To find the number of smaller tanks that can be filled with water from it.

    Answer:

    (c) We have to find out the volume.

    Question:2 Diameter of cylinder A is 7 cm, and the height is 14 cm. Diameter of cylinder B is 14 cm and height is 7 cm. Without doing any calculations can you suggest whose volume is greater? Verify it by finding the volume of both the cylinders. Check whether the cylinder with greater volume also has greater surface area?

    1655617952866

    Answer:

    Given the diameter of cylinder A = 7cm and the height = 14cm.

    Also, the diameter of cylinder B = 14cm and height = 7cm.

    We can easily suggest whose volume is greater without doing any calculations:

    As volume is directly proportional to the square of the radius of cylinder and directly proportional to the height of the cylinder hence

    B has more Volume as compared to A because B has a larger diameter.

    Verifying:

    Volume of A : \pi\times r^2\times height = \pi\times (\frac{7cm}{2})^2\times 14cm =539cm^3

    and Volume of B : \pi\times r^2\times height = \pi\times (\frac{14cm}{2})^2\times 7cm =1,078cm^3 .

    Hence clearly we can see that the volume of cylinder B is greater than the volume of cylinder A.

    The cylinder B has surface area of = 2\times \pi\times r(r+h) = 2\times \pi\times \frac{14cm}{2}(\frac{14}{2}+7) = 616cm^2 .

    and the surface area of cylinder A = 2\times \pi\times r(r+h) = 2\times \pi\times \frac{7cm}{2}\times (\frac{7}{2}+14) = 385cm^2 .

    The cylinder with greater volume also has greater surface area.

    Question:3 Find the height of a cuboid whose base area is 180 cm 2 and volume is 900 cm 3?

    Answer:

    Given that the height of a cuboid whose base area is 180cm^2 and volume is 900cm^3 ;

    As Volume\ of\ cuboid = Base\ area\times height

    So, we have relation: 900cm^3= 180cm^2\times height

    or, Height = 5cm.

    Question:4 A cuboid is of dimensions 60 cm \times 54 cm \times 30 cm . How many small cubes with side 6 cm can be placed in the given cuboid?

    Answer:

    So given the dimensions of cuboid 60 cm \times 54 cm \times 30 cm hence it's the volume is equal to = 97,200cm^3

    We have to make small cubes with side 6cm which occupies the volume = 6cm\times 6cm\times 6cm = 216cm^3

    Hence we have now one cube having side length = 6cm volume = 216cm^3 .

    So, total numbers of small cubes that can be placed in the given cuboid = \frac{97,200}{216} =450

    Hence 450 small cubes can be placed in that cuboid.

    Question:5 Find the height of the cylinder whose volume is 1.54 m 3 and diameter of the base is 140 cm ?

    Answer:

    Given that the volume of the cylinder is 1.54m^3 and having its diameter of base = 140cm.

    So, as Volume\ of\ cylinder = Base\ area\times height ;

    hence putting in the relation we get;

    1.54m^3= (\pi\times (\frac{1.4m}{2})^2)\times height

    The height of the cylinder would be = 1metre .

    Question:6 A milk tank is in the form of cylinder whose radius is 1.5 m and length is 7 m. Find the quantity of milk in litres that can be stored in the tank?

    Answer:

    Volume of the cylinder = V = \Pi r^2h

    \Pi (1.5)^2\times7 = 49.48\ m^3

    So the quantity of milk in litres that can be stored in the tank is 49500 litres.

    \left ( \because 1\ m^3 = 1000\ litres \right )

    Question:7(i) If each edge of a cube is doubled,

    how many times will its surface area increase?

    Answer:

    The surface area of cube = 6l^2

    So if we double the edge l becomes 2l.

    New surface area = 6(2l)^2 = 24l^2

    Thus surface area becomes 4 times.

    Question:7(ii) If each edge of a cube is doubled,

    how many times will its volume increase?

    Answer:

    Volume of cube = l^3

    Since l becomes 2l, so new volume is : (2l)^3 = 8l^3 .

    Hence volume becomes 8 times.

    Question:8 Water is pouring into a cubiodal reservoir at the rate of 60 litres per minute. If the volume of reservoir is 108\ m^3 , find the number of hours it will take to fill the reservoir.

    Answer:

    Given that the water is pouring into a cuboidal reservoir at the rate of 60 litres per minute.

    Volume of the reservoir is 108\ m^3 , then

    The number of hours it will take to fill the reservoir will be:

    As we know 1m^3 = 1000L .

    Then 108\ m^3 = 108,000 Litres ;

    Time taken to fill the tank will be:

    \frac{1,08,000litres}{60litres\ per\ minute} = 1,800 minutes

    or \frac{1,800hours}{60} =30hours .

    NCERT Solutions For Class 8 Maths Chapter 11 Mensuration - Topics

    • Let us Recall

    • Area of Trapezium

    • Area of a General Quadrilateral

    • Area of a Polygon

    • Solid Shapes

    • Surface Area of Cube, Cuboid, and Cylinder

    • The volume of Cube, Cuboid, and Cylinder

    • Volume and Capacity

    NCERT Solutions for Class 8 Maths - Chapter Wise

    NCERT Solutions for Class 8 - Subject Wise

    NCERT Solutions For Class 8 Maths Chapter 11 Mensuration To Remember - Formulae

    • Area of a trapezium

    \frac{1}{2}[\text{sum of the lengths of parallel sides} \ \times \ \text{ perpendicular distance between them}]

    • Area of a rhombus

    \frac{1}{2}[\text{product of its diagonals} ]

    • The surface area of a cuboid = 2(lb + bh + lh)

    l- length of the cuboid

    b- breadth of the cuboid

    h- height of the cuboid

    • The surface area of a cube

    6l ^2 \\ \text{ l- side of the cube}

    • The Surface area of a cylinder

    2\pi r(r+h)

    r- radius of the cylinder

    h- height of the cylinder

    • The volume of a cuboid

    l \times b \times h

    l- length of the cuboid

    b- breadth of the cuboid

    h- height of the cuboid

    • The volume of a cube = l3
    • The volume of a cylinder = πr 2 h

    r- radius of the cylinder

    h- height of the cylinder

    Tip - If you have derived the formulas and know how to drive it, then you can solve any problem of this chapter easily. You can take help from NCERT solutions for class 8 maths chapter 11 mensuration if you are not able to solve the problem. It will make your task easy.

    NCERT Books and NCERT Syllabus

    Frequently Asked Question (FAQs)

    1. What are the important topics of chapter Mensuration ?

    Area of trapezium, area of quadrilateral, area of the polygon,  area and volume of the solid shapes like cube, cuboid and cylinder are covered in this chapter.

    2. How many chapters are there in the CBSE class 8 maths ?

    There are 16 chapters starting from rational number to playing with numbers in the CBSE class 8 maths.

    3. Does CBSE class maths is tough ?

    No, CBSE class 8 maths is a basic and damn simple where most of the topics related to the previous classes.

    4. Which is the official website of NCERT ?

    NCERT official is the official website of the NCERT where you can get NCERT textbooks and syllabus from class 1 to 12.

    5. Where can I find the complete solutions of NCERT for class 8 ?

    Here you will get the detailed NCERT solutions for class 8 by clicking on the link.

    6. Where can I find the complete solutions of NCERT for class 8 maths ?

    Here you will get the detailed NCERT solutions for class 8 maths by clicking on the link.

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    Get answers from students and experts

    A block of mass 0.50 kg is moving with a speed of 2.00 ms-1 on a smooth surface. It strikes another mass of 1.00 kg and then they move together as a single body. The energy loss during the collision is

    Option 1)

    0.34\; J

    Option 2)

    0.16\; J

    Option 3)

    1.00\; J

    Option 4)

    0.67\; J

    A person trying to lose weight by burning fat lifts a mass of 10 kg upto a height of 1 m 1000 times.  Assume that the potential energy lost each time he lowers the mass is dissipated.  How much fat will he use up considering the work done only when the weight is lifted up ?  Fat supplies 3.8×107 J of energy per kg which is converted to mechanical energy with a 20% efficiency rate.  Take g = 9.8 ms−2 :

    Option 1)

    2.45×10−3 kg

    Option 2)

     6.45×10−3 kg

    Option 3)

     9.89×10−3 kg

    Option 4)

    12.89×10−3 kg

     

    An athlete in the olympic games covers a distance of 100 m in 10 s. His kinetic energy can be estimated to be in the range

    Option 1)

    2,000 \; J - 5,000\; J

    Option 2)

    200 \, \, J - 500 \, \, J

    Option 3)

    2\times 10^{5}J-3\times 10^{5}J

    Option 4)

    20,000 \, \, J - 50,000 \, \, J

    A particle is projected at 600   to the horizontal with a kinetic energy K. The kinetic energy at the highest point

    Option 1)

    K/2\,

    Option 2)

    \; K\;

    Option 3)

    zero\;

    Option 4)

    K/4

    In the reaction,

    2Al_{(s)}+6HCL_{(aq)}\rightarrow 2Al^{3+}\, _{(aq)}+6Cl^{-}\, _{(aq)}+3H_{2(g)}

    Option 1)

    11.2\, L\, H_{2(g)}  at STP  is produced for every mole HCL_{(aq)}  consumed

    Option 2)

    6L\, HCl_{(aq)}  is consumed for ever 3L\, H_{2(g)}      produced

    Option 3)

    33.6 L\, H_{2(g)} is produced regardless of temperature and pressure for every mole Al that reacts

    Option 4)

    67.2\, L\, H_{2(g)} at STP is produced for every mole Al that reacts .

    How many moles of magnesium phosphate, Mg_{3}(PO_{4})_{2} will contain 0.25 mole of oxygen atoms?

    Option 1)

    0.02

    Option 2)

    3.125 × 10-2

    Option 3)

    1.25 × 10-2

    Option 4)

    2.5 × 10-2

    If we consider that 1/6, in place of 1/12, mass of carbon atom is taken to be the relative atomic mass unit, the mass of one mole of a substance will

    Option 1)

    decrease twice

    Option 2)

    increase two fold

    Option 3)

    remain unchanged

    Option 4)

    be a function of the molecular mass of the substance.

    With increase of temperature, which of these changes?

    Option 1)

    Molality

    Option 2)

    Weight fraction of solute

    Option 3)

    Fraction of solute present in water

    Option 4)

    Mole fraction.

    Number of atoms in 558.5 gram Fe (at. wt.of Fe = 55.85 g mol-1) is

    Option 1)

    twice that in 60 g carbon

    Option 2)

    6.023 × 1022

    Option 3)

    half that in 8 g He

    Option 4)

    558.5 × 6.023 × 1023

    A pulley of radius 2 m is rotated about its axis by a force F = (20t - 5t2) newton (where t is measured in seconds) applied tangentially. If the moment of inertia of the pulley about its axis of rotation is 10 kg m2 , the number of rotations made by the pulley before its direction of motion if reversed, is

    Option 1)

    less than 3

    Option 2)

    more than 3 but less than 6

    Option 3)

    more than 6 but less than 9

    Option 4)

    more than 9

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    Production Planner

    Individuals who opt for a career as a production planner are professionals who are responsible for ensuring goods manufactured by the employing company are cost-effective and meets quality specifications including ensuring the availability of ready to distribute stock in a timely fashion manner. 

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    Process Development Engineer

    The Process Development Engineers design, implement, manufacture, mine, and other production systems using technical knowledge and expertise in the industry. They use computer modeling software to test technologies and machinery. An individual who is opting career as Process Development Engineer is responsible for developing cost-effective and efficient processes. They also monitor the production process and ensure it functions smoothly and efficiently.

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    Metrologist

    You might be googling Metrologist meaning. Well, we have an easily understandable Metrologist definition for you. A metrologist is a professional who stays involved in measurement practices in varying industries including electrical and electronics. A Metrologist is responsible for developing processes and systems for measuring objects and repairing electrical instruments. He or she also involved in writing specifications of experimental electronic units. 

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    Structural Engineer

    A Structural Engineer designs buildings, bridges, and other related structures. He or she analyzes the structures and makes sure the structures are strong enough to be used by the people. A career as a Structural Engineer requires working in the construction process. It comes under the civil engineering discipline. A Structure Engineer creates structural models with the help of computer-aided design software. 

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    Process Engineer

    As the name suggests, a Process Engineer stays involved in designing, overseeing, assessing and implementing processes to make products and provide services efficiently. Process Engineers are responsible for creating systems to enhance productivity and cut costs. 

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    Information Security Manager

    Individuals in the information security manager career path involves in overseeing and controlling all aspects of computer security. The IT security manager job description includes planning and carrying out security measures to protect the business data and information from corruption, theft, unauthorised access, and deliberate attack 

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    Computer Programmer

    Careers in computer programming primarily refer to the systematic act of writing code and moreover include wider computer science areas. The word 'programmer' or 'coder' has entered into practice with the growing number of newly self-taught tech enthusiasts. Computer programming careers involve the use of designs created by software developers and engineers and transforming them into commands that can be implemented by computers. These commands result in regular usage of social media sites, word-processing applications and browsers.

    3 Jobs Available
    Product Manager

    A Product Manager is a professional responsible for product planning and marketing. He or she manages the product throughout the Product Life Cycle, gathering and prioritising the product. A product manager job description includes defining the product vision and working closely with team members of other departments to deliver winning products.  

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    ITSM Manager

    ITSM Manager is a professional responsible for heading the ITSM (Information Technology Service Management) or (Information Technology Infrastructure Library) processes. He or she ensures that operation management provides appropriate resource levels for problem resolutions. The ITSM Manager oversees the level of prioritisation for the problems, critical incidents, planned as well as proactive tasks. 

    3 Jobs Available
    .NET Developer

    .NET Developer Job Description: A .NET Developer is a professional responsible for producing code using .NET languages. He or she is a software developer who uses the .NET technologies platform to create various applications. Dot NET Developer job comes with the responsibility of  creating, designing and developing applications using .NET languages such as VB and C#. 

    2 Jobs Available
    Corporate Executive

    Are you searching for a Corporate Executive job description? A Corporate Executive role comes with administrative duties. He or she provides support to the leadership of the organisation. A Corporate Executive fulfils the business purpose and ensures its financial stability. In this article, we are going to discuss how to become corporate executive.

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    DevOps Architect

    A DevOps Architect is responsible for defining a systematic solution that fits the best across technical, operational and and management standards. He or she generates an organised solution by examining a large system environment and selects appropriate application frameworks in order to deal with the system’s difficulties. 

    2 Jobs Available
    Cloud Solution Architect

    Individuals who are interested in working as a Cloud Administration should have the necessary technical skills to handle various tasks related to computing. These include the design and implementation of cloud computing services, as well as the maintenance of their own. Aside from being able to program multiple programming languages, such as Ruby, Python, and Java, individuals also need a degree in computer science.

    2 Jobs Available
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