Introduction Quiz - CBSE Class 7 Mathematics

Free practice quiz: Introduction (CBSE Class 7 Mathematics). 12 multiple-choice questions with answers and explanations. Play online, no sign-up needed.

Sample questions

1. What is volume in mathematics?

   1. A measure of space inside a 3D object
   2. The weight of an object
   3. The length of an object
   4. The height of an object
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   Answer: A. A measure of space inside a 3D object

   Volume is the amount of space inside a three-dimensional object, like a cube or a cylinder.

2. What is surface area in mathematics?

   1. The total area of the surface of a 3D object
   2. The perimeter of a 2D shape
   3. The space inside a 2D shape
   4. The length of a 3D object
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   Answer: A. The total area of the surface of a 3D object

   Surface area is the total area that the surface of an object occupies.

3. Find the surface area of a cube with side length of 5 cm.

   1. 150 cm²
   2. 125 cm²
   3. 100 cm²
   4. 25 cm²
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   Answer: A. 150 cm²

   The surface area of a cube is 6 times the area of one face. So, 6 × (5 cm × 5 cm) = 150 cm².

4. A cube with a side length of 6 cm and a sphere have equal volumes. Find the sphere's approximate radius.

   1. 3.6 cm
   2. 4.5 cm
   3. 5.8 cm
   4. 6 cm
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   Answer: A. 3.6 cm

   Volume of cube = 6³ = 216 cm³. Use sphere volume formula 4/3 πr³ = 216 to find r ≈ 3.6 cm.

5. By what factor does the surface area change if a sphere's radius triples?

   1. 9 times
   2. 3 times
   3. 27 times
   4. 1 time
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   Answer: A. 9 times

   Surface area is proportional to r². Tripling radius increases surface area by 3² = 9 times.

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