Chapter-8 Mensuration — Online MCQ Test
MATHS · Samacheer Kalvi 8th · Tamil Nadu State Board
Practice Chapter-8 Mensuration with a free chapter-wise online MCQ test.
This chapter covers: surface area volume solids Explains surface area and volume of cube cuboid cylinder cone and sphere.
AI-generated questions from basic to board-exam level, with instant results and explanations.
Chapter-8 Mensuration — Important Questions & Answers
What is the formula for the volume of a cube with side length a?
- A. a + a + a
- B. 6a²
- C. a³
- D. 2a³
Answer: C. a³
The volume of a cube is found by multiplying length, breadth, and height. Since all are equal to a, the volume is a × a × a = a³.
The volume of a cube is found by multiplying length, breadth, and height. Since all are equal to a, the volume is a × a × a = a³.
How many edges does a cuboid have?
- A. 6
- B. 8
- C. 12
- D. 16
Answer: C. 12
A cuboid has 12 edges in total. It also has 6 rectangular faces and 8 vertices.
A cuboid has 12 edges in total. It also has 6 rectangular faces and 8 vertices.
The total surface area of a cube with side 5 cm is:
- A. 25 cm²
- B. 50 cm²
- C. 100 cm²
- D. 150 cm²
Answer: C. 100 cm²
Total surface area of a cube = 6a². Substituting a = 5, we get 6 × 25 = 150 cm².
Total surface area of a cube = 6a². Substituting a = 5, we get 6 × 25 = 150 cm².
Two cubes have side lengths 4 cm and 8 cm. What is the ratio of their volumes?
- A. 1:2
- B. 1:4
- C. 1:8
- D. 1:16
Answer: C. 1:8
Volumes of cubes are proportional to the cube of side lengths. So the ratio is 4³ : 8³ = 64 : 512 = 1 : 8.
Volumes of cubes are proportional to the cube of side lengths. So the ratio is 4³ : 8³ = 64 : 512 = 1 : 8.
Which of the following is NOT a correct formula?
- A. Volume of cube = a³
- B. Total surface area of cuboid = 2(lb + bh + hl)
- C. Curved surface area of cone = 2πrl
- D. Volume of cylinder = πr²h
Answer: C. Curved surface area of cone = 2πrl
The curved surface area of a cone is πrl, not 2πrl. The other formulas are correct standard mensuration formulas.
The curved surface area of a cone is πrl, not 2πrl. The other formulas are correct standard mensuration formulas.