Home | | Maths 10th Std | Exercise 7.1: Surface Area

# Exercise 7.1: Surface Area

Surface Area of Right Circular Cylinder, Surface Area of Hollow Cylinder, Surface Area of Right Circular Cone, Surface Area of The Sphere, Surface Area: Frustum of a right circular cone. (Maths Book back answers and solution for Exercise questions)

Exercise 7.1

1. The radius and height of a cylinder are in the ratio 5:7 and its curved surface area is 5500 sq.cm. Find its radius and height.

2. A solid iron cylinder has total surface area of 1848 sq.m. Its curved surface area is five – sixth of its total surface area. Find the radius and height of the iron cylinder.

3. The external radius and the length of a hollow wooden log are 16 cm and 13 cm respectively. If its thickness is 4 cm then find its T.S.A.

4. A right angled triangle PQR where Q = 90 is rotated about QR and PQ. If QR=16 cm and PR=20 cm, compare the curved surface areas of the right circular cones so formed by the triangle.

5. 4 persons live in a conical tent whose slant height is 19 cm. If each person require 22 cm2 of the floor area, then find the height of the tent.

6. A girl wishes to prepare birthday caps in the form of right circular cones for her birthday party, using a sheet of paper whose area is 5720 cm2, how many caps can be made with radius 5 cm and height 12 cm.

7. The ratio of the radii of two right circular cones of same height is 1:3. Find the ratio of their curved surface area when the height of each cone is 3 times the radius of the smaller cone.

8. The radius of a sphere increases by 25%. Find the percentage increase in its surface area.

9. The internal and external diameters of a hollow hemispherical vessel are 20 cm and 28 cm respectively. Find the cost to paint the vessel all over at ₹ 0.14 per cm2 .

10. The frustum shaped outer portion of the table lamp has to be painted including the top part. Find the total cost of painting the lamp if the cost of painting 1 sq.cm is ₹ 2.

1. 25 cm, 35 cm

2. 7 m, 35 m

3. 2992 sq.cm

4. CSA of the cone when rotated about PQ is larger.

5. 18.25 cm

6. 28 caps

7. √5 : 9

8. 56.25%

9. ₹ 302.72

10. ₹ 1357.72

Tags : Problem Questions with Answer, Solution | Mensuration | Mathematics , 10th Mathematics : UNIT 7 : Mensuration
Study Material, Lecturing Notes, Assignment, Reference, Wiki description explanation, brief detail
10th Mathematics : UNIT 7 : Mensuration : Exercise 7.1: Surface Area | Problem Questions with Answer, Solution | Mensuration | Mathematics
{"found_math": false, "script_math_tex": 0, "script_math_asciimath": 0, "math_annotations": 0, "math_alttext": 0, "mathml": 0, "mathjax_tag": 0, "mathjax_inline_tex": 0, "mathjax_display_tex": 0, "mathjax_asciimath": 0, "img_math": 0, "codecogs_latex": 0, "wp_latex": 0, "mimetex.cgi": 0, "/images/math/codecogs": 0, "mathtex.cgi": 0, "katex": 0, "math-container": 0, "wp-katex-eq": 0, "align": 0, "equation": 0, "x-ck12": 0, "texerror": 0}