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## Chapter 14 | Mensuration | Class-8 DAV Secondary Mathematics

## Unit 14 Worksheet 4 || Mensuration

**1. Find the curved surface area and total surface area of a right circular cylinder whose height is 15 cm and the radius of the base is 7 cm. **

**Answer 1:**

**2. The diameter of the base of a right circular cylinder is 4.2 dm and its height is 1 dm. Find the area of the curved surface in cm2.**

**Answer 2:**

**3.** **The curved surface area of a cylinder is 1,320 cm2 and its base has a radius of 10.5 cm. Find the height of the cylinder. **

**Answer 3:**

**4. The circumference of the base of a cylinder is 176 cm and its height is 65 cm. Find its lateral surface area.**

**Answer 4:**

**5.** **The radii of two cylinders are in the ratio 2 : 3 and their heights are in the ratio 5 : 3. Calculate the ratio of their curved surface areas.**

**Answer 5:**

**6. The outer diameter of a gas cylinder is 20 cm. Find the cost of the painting of its outer curved surface at ₹4 per square centimetre if the height of the cylinder is 70 cm. **

**Answer 6:**

**7. A cylindrical vessel, open at the top, has a radius 10 cm and height 14 cm. Find the total surface area of the vessel. (Take π** =** 3.14)**.

**Answer 7:**

**8. The length of a roller is 40 cm and its diameter is 21 cm. It takes 300 complete revolutions to nave once over to level the floor of a room. Find the area of the room in m2.**

**Answer 8:**

**9.** **A closed metallic cylinder has its base diameter 56 cm and it is 2.25 m high. Find the cost of the metal used to make it if it costs ₹80 per square metre.**

**Answer 9:** ** **

**10. A rectangular piece of paper is 22 cm in length and 10 cm in width. It is rolled into a cylinder along its length. Find the surface area of this cylinder. **

**Answer 10:**

**11. A cylindrical well is 21 m deep. Its outer and inner diameters are 21 m and 14 m respectively. Find the cost of renovating the inner curved surface and outer curved surface at the rate of ₹25 per m2**.

**Answer 11:**

- DAV class 8 Maths Book Solutions
- Chapter 1 | Square and Square Roots | Class-8 DAV Secondary Mathematics
- Chapter 2 | Cube and Cube Roots | Class-8 DAV Secondary Mathematics
- Chapter 3 | Exponents And Radicals | Class-8 DAV Secondary Mathematics
- Chapter 4 | Direct And Inverse Variation | Class-8 DAV Secondary Mathematics
- Chapter 5 | Profit, Loss And Discount | Class-8 DAV Secondary Mathematics
- Chapter 6 | Compound Interest | Class-8 DAV Secondary Mathematics
- Chapter 7 | Algebraic Identities | Class-8 DAV Secondary Mathematics
- Chapter 8 | Polynomials | Class-8 DAV Secondary Mathematics
- Chapter 9 | Linear Equations In One Variable | Class-8 DAV Secondary Mathematics
- Chapter 10 | Parallel Lines | Class-8 DAV Secondary Mathematics
- Chapter 11 | Understanding Quadrilaterals | Class-8 DAV Secondary Mathematics
- Chapter 12 | Construction Of Quadrilaterals | Class-8 DAV Secondary Mathematics
- Chapter 13 | Introduction To Graphs | Class-8 DAV Secondary Mathematics
- Chapter 14 | Mensuration | Class-8 DAV Secondary Mathematics
- Chapter 15 | Statistics and Probability | Class-8 DAV Secondary Mathematics
- Chapter 16 | Rotational Symmetry | Class-8 DAV Secondary Mathematics