Mensuration class VIII

A cylindrical box has ____ curved surface and ____ circular faces, which are identical.

• A. One, One

• B. One, two

• C. two, one

• D. two, two

All six faces of a cube are:

• A. Identical

• B. Different

• C. Circular

• D. Rectangular

A cuboid has ______ pairs of identical faces.

• A. 2

• B. 3

• C. 4

• D. 5

The area of a triangle with base b and altitude h is

• (a) 1/2 bh

• (b) bh

• (c) 1/3 bh

• (d) 1/4 bh

1 cm³ =

• (a) 1000 mm³

• (b) 100 mm³

• (c) 10 mm³

• (d) 1/1000 mm³

The total surface area of a cylinder of base radius r and height h is

• (a) 2πr (r + h)

• (b) πr (r + h)

• (c) 2πrh

• (d) 2πr²

The area of the figure is

• (a) 77 cm²

• (b) 154 cm²

• (c) 38.5 cm²

• (d) none of these

If the height of a cuboid becomes zero, it will take the shape of a

• (a) cube

• (b) parallelogram

• (c) circle

• (d) rectangle

8 persons can stay in a cubical room. Each person requires 27 m³ of air. The side of the cube is

• (a) 6 m

• (b) 4 m

• (c) 3 m

• (d) 2 m

The base area of a right circular cylinder is 16πcm³. Its height is 5 cm. Its curved surface area is

• (a) 40π cm²

• (b) 30π cm²

• (c) 20π cm²

• (d) 10π cm²