Chapter 11 MATHS : Surface Areas and Volumes — Online MCQ Test
MATHS · CLASS 9th · Andhra State Board
Practice Chapter 11 MATHS : Surface Areas and Volumes with a free chapter-wise online MCQ test.
This chapter covers: This chapter covers surface area and volume calculations for 3D geometric shapes including right circular cones and spheres..
AI-generated questions from basic to board-exam level, with instant results and explanations.
Chapter 11 MATHS : Surface Areas and Volumes — Important Questions & Answers
What is the formula for the curved surface area of a right circular cone with radius 'r' and slant height 'l'?
- A. 2πrl
- B. πrl
- C. πr²l
- D. πr(r+l)
Answer: B. πrl
The curved surface area of a cone is given by the product of π, radius, and slant height.
The curved surface area of a cone is given by the product of π, radius, and slant height.
The surface area of a sphere with radius 'r' is given by:
- A. πr²
- B. 2πr²
- C. 3πr²
- D. 4πr²
Answer: D. 4πr²
The surface area of a sphere is defined as 4 times π times the square of the radius.
The surface area of a sphere is defined as 4 times π times the square of the radius.
If the radius of a sphere is 7 cm, what is its surface area? (Take π = 22/7)
- A. 154 cm²
- B. 308 cm²
- C. 616 cm²
- D. 1232 cm²
Answer: C. 616 cm²
Using 4πr², we get 4 * (22/7) * 7 * 7 = 616 cm².
Using 4πr², we get 4 * (22/7) * 7 * 7 = 616 cm².
Two spheres have radii in the ratio 1:2. The ratio of their surface areas is:
- A. 1:2
- B. 1:4
- C. 1:8
- D. 2:1
Answer: B. 1:4
Ratio of surface areas = (r1/r2)² = (1/2)² = 1/4.
Ratio of surface areas = (r1/r2)² = (1/2)² = 1/4.
A right circular cone is cut by a plane parallel to the base. What is the shape of the cross-section?
- A. Triangle
- B. Rectangle
- C. Circle
- D. Semicircle
Answer: C. Circle
A horizontal slice parallel to the circular base of a cone always results in a smaller circle.
A horizontal slice parallel to the circular base of a cone always results in a smaller circle.