Maths 9 (13)--

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Maths IX chapter 13

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www.kuttymath.webs.com For any Math related doubts visit

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Questions Maths - 9 th (Surface area and volume)

1)The radius of a sphere is 2r, then its volume will be :

1)The radius of a sphere is 2r, then its volume will be 4/3 πr 3 4 πr 3 8/3 πr 3 32/3 πr 3

2)The total surface area of a cube is 96 cm2. The volume of the cube is:

2)The total surface area of a cube is 96 cm 2 . The volume of the cube is 8 cm 3 512 cm 3 64 cm 3 27 cm 3

3)A cone is 8.4 cm height and the radius of its base is 2.1 cm. It is melted and recast into a sphere. The radius of the sphere is :

3)A cone is 8.4 cm height and the radius of its base is 2.1 cm. It is melted and recast into a sphere. The radius of the sphere is 4.2 cm 2.1 cm 2.4 cm 1.6 cm

4)In a cylinder , radius is doubled and height is halved ,CSA will be :

4)In a cylinder , radius is doubled and height is halved ,CSA will be Halved Doubled Same Four times

5)The TSA of a cone whose radius is r/2 and slant height 2l is :

5)The TSA of a cone whose radius is r/2 and slant height 2l is 2πr(l + r) πr(l + r/4 ) πr(l + r) 2πrl

6)The radii of two cylinders are in the ratio of 2:3 and their heights are in the ratio of 5:3. The ratio of its volume is :

6)The radii of two cylinders are in the ratio of 2:3 and their heights are in the ratio of 5:3. The ratio of its volume is 10:17 20:27 17:27 20:37

7)The lateral surface area of a cube is 256 m2. The volume of the cube is :

7)The lateral surface area of a cube is 256 m2. The volume of the cube is 512 m 3 64 m 3 216 m 3 256 m 3

8)The number of plunks of dimensions 4m x 5m x2m that can be stored in a pit which is 40m long , 12m wide and 160m deep is :

8)The number of plunks of dimensions 4m x 5m x2m that can be stored in a pit which is 40m long , 12m wide and 160m deep is 1900 1920 1800 1840

9)The length of the largest pole that can be put in a room of dimensions 10m x 10m x 5m is :

9)The length of the largest pole that can be put in a room of dimensions 10m x 10m x 5m is 15 m 16 m 10 m 12 m

10)The radius of a hemi-spherical balloon increases from 6cm to 12cm as air is being pumped into it. The ratios of surface areas of the balloon in the two cases is :

10)The radius of a hemi-spherical balloon increases from 6cm to 12cm as air is being pumped into it. The ratios of surface areas of the balloon in the two cases is 1:4 1:3 2:3 2:1

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