START UP MATHEMATICS>Chapter 18 - Mensuration-II (Solid Figures)>EXERCISE 18.2>Q 11

MEDIUM

8th CBSE

IMPORTANT

Earn 100

The length of a hall is $22 m$ and width is $18 m$ . The sum of the areas of the floor and the flat roof is equal to the sum of the area of the four walls. Find the height and volume of the hall.

Important Questions on Mensuration-II (Solid Figures)

MEDIUM

8th CBSE

IMPORTANT

START UP MATHEMATICS>Chapter 18 - Mensuration-II (Solid Figures)>EXERCISE 18.2>Q 12

A solid cube is cut into two cuboids of equal volumes. Find the ratio of the total surface area of the given cube and that of one of the cuboids.

MEDIUM

8th CBSE

IMPORTANT

START UP MATHEMATICS>Chapter 18 - Mensuration-II (Solid Figures)>EXERCISE 18.2>Q 13

The dimensions of a rectangular box are in the ratio of

2 : 3 : 4

and the difference between the cost of covering it with a cloth at the rate of

₹ 10

and

₹ 11

per

m^{2}

is

₹ 1300

. Find the dimensions of the box.

MEDIUM

8th CBSE

IMPORTANT

START UP MATHEMATICS>Chapter 18 - Mensuration-II (Solid Figures)>EXERCISE 18.2>Q 14

A rectangular swimming pool

30 m

long and

20 m

wide and

1.5 m

deep is to be tiled. If each tile is

50 cm \times 50 cm

. How many tiles will be required?

HARD

8th CBSE

IMPORTANT

START UP MATHEMATICS>Chapter 18 - Mensuration-II (Solid Figures)>EXERCISE 18.2>Q 15

A log of wood of dimensions

2 m \times 20 cm \times 10 cm

is cut into small blocks of

10 cm x 5 cm x 4 cm .

How many blocks do we get? What will be the total surface area of all these blocks?

MEDIUM

8th CBSE

IMPORTANT

START UP MATHEMATICS>Chapter 18 - Mensuration-II (Solid Figures)>EXERCISE 18.2>Q 16

The dimensions of a building are

30 m x 20 m \times 40 m

. If the walls, floor and roof of this building are to be repaired, the contractor asks for

₹ 50

per square metre. What will be the estimate of the contractor for this work?

MEDIUM

8th CBSE

IMPORTANT

START UP MATHEMATICS>Chapter 18 - Mensuration-II (Solid Figures)>EXERCISE 18.3>Q 1

The radius of a right circular cylinder is

7 cm

and its height is

14 cm

. Find its curved surface area and total surface area.

MEDIUM

8th CBSE

IMPORTANT

START UP MATHEMATICS>Chapter 18 - Mensuration-II (Solid Figures)>EXERCISE 18.3>Q 2

The curved surface area of a cylinder is $1, 000 {cm}^{2}$ and the radius of its base is $21 cm$ . Find the total surface area of the cylinder.

(Take $π = \frac{22}{7}$ )

MEDIUM

8th CBSE

IMPORTANT

START UP MATHEMATICS>Chapter 18 - Mensuration-II (Solid Figures)>EXERCISE 18.3>Q 3

An open cylindrical oil tank has diameter

14 m

and height

9 m

. If the inner side of the tank has to be painted all over, what will it cost at

₹ 40

per square metre? (Take

π = \frac{22}{7}

)