13. Surface Areas and Volumes-page1 Mathematics Class 9 In English-CBSE Notes
Get updated Maths Concepts for mathematics for class 9 chapter 13. Surface Areas and Volumes Topic page1 with clear explanations free access in English medium.
13. Surface Areas and Volumes-page1 Mathematics Class 9 In English-CBSE Notes
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All Topics Chapter 13. Surface Areas and Volumes
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13. Surface Areas and Volumes-page1 Mathematics Class 9 In English-CBSE Notes
13. Surface Areas and Volumes
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Additional -Questions With Solutions
Q1. A cube and cuboid have same volume. The dimenstions of the cuboid are in the ratio 1 : 2: 4. if the difference between the cost of polishing the cube and cuboid at the rate of Rs. 5 per m2 is 80, find their volumes.
Ans: 64 m3
Q2. The sum of length, breadth and depth of a cuboid is 19 cm and the length of the diagonal in 11 cm. Find the surface area of the cuboid.
Ans: 240 cm2
Q3. The ratio of the curved surface area to the total surface area of a right circular cylinder is 1: 3. Find the volume of the cylinder if its total surface area is 1848 cm2.
Ans: 4312 cm3
Q4. The cost of papering four walls of a room at Rs. 1.50 per square meter is Rs. 337.50. The height of the room is 5 m. Find the length and breadth of the room if they are in the ratio 4 : 1.
Ans: l = 18 m, b= 4.5
Q5. Circumference of the base of a cylinder open at top is 132 cm. The sum of radius and height of the cylinder 41 cm. FInd the cost of polishing the outer surface of cylinder at rate of Rs. 10 per square metre.
Ans: Rs. 4.026
Q6. The total surface area of a right circular cylinder is 6512 cm2, and the circumference of its base is 88 cm, find the volume of the cylinder.
Ans: 36960 cm3
Q7. The areas of three adjacent faces of a cuboid are 108 cm2, 72 cm2 and 96 cm2 respectively. Find the volume of the cuboid. Also find the dimensions of the cuboid.
Ans: Volume = 864 cm2, dimensions 12 cm x 9 cm x 8 cm
Q8. A right circular cone is 5.4 cm high and radius of its base is 2 cm. It is melted and recast into another right circular cone with radius of base as 1.5 cm. Find the height of the new cone formed.
Ans: 9.6 cm
Q9. The radius and height of a right circular cone are in the ratio 3 : 4. If its volume is 301.44 cm3, find its radius and slaint height. [take π = 3.14]
Ans: Radius : 6 cm, height = 10 cm
Q10. Four cubes each of side 5 cm are joined end to end. Find surface area of resultant cuboid.
Ans: 450 cm2
Q11. A hemispherical dome of a building needs to be painted. If the circumference of the base of dome is 17.6 m, find the cost of painting it, at the rate of 5 per 100 cm2.
Ans: Rs. 24640
Q12. The difference between outsite and inside surfaces of cylinderical metallic pipe 14 cm ling is 44 cm2. If a pipe is made of 99 cm3 of metal, find the outer and inner radii of the pipe.
Ans: R = 2.5 cm, r = 2 cm
Q13. If in a sphere, volume and surface area are numerically equal, find the radius.
Ans: r = 3 units
Q14. Rain water which falls on a flat rectangular surface of length 6 m and breadth 4 m is transferred into a cylindrical vessel of internal radius 20 cm. What will be height of water in the cylinderical vessel if the rainfall is 1 cm ? Give naswer to the nearest whole number. [use π = 3.14]
Ans: 192 cm
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All Topics Chapter 13. Surface Areas and Volumes
13. Surface Areas and Volumes-page1 Mathematics Class 9 In English-CBSE Notes
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CBSE Notes for Class 9 mathematics Chapter 13. Surface Areas and Volumes – page1
The CBSE Notes for Class 9 mathematics Chapter 13. Surface Areas and Volumes – page1 are prepared to help students understand every concept in a simple, clear, and well-organized manner. These notes are based on the latest CBSE syllabus and are suitable for regular classroom learning, homework, revision, and examination preparation. Every topic is explained using easy language so that students can learn important concepts without difficulty and develop a strong academic foundation.
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13. Surface Areas and Volumes-page1 Mathematics Class 9 In English-CBSE Notes Study Materials For Class 6 to 12
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