# Mensuration (IMO- Mathematics Olympiad Class 8): Questions 23 - 28 of 61

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## Question number: 23

» Mensuration

MCQ▾

### Question

The dimensions of an open box are 30 cm, 20 cm and 11 cm. Its thickness is 2 cm. If 1 cubic cm of metal used in the box weights 1 gms, find the weight of the box.

### Choices

Choice (4) Response

a.

1.99 kg

b.

4.561 kg

c.

1.860 kg

d.

2.856 kg

## Question number: 24

» Mensuration

MCQ▾

### Question

If the area of a triangle with base a is equal to area of a square of side a, the altitude of the triangle is________.

### Choices

Choice (4) Response

a.

b.

c.

d.

## Question number: 25

» Mensuration

MCQ▾

### Question

Two cubes have their volumes in the ratio 1: 64. Find the ratio of their surface areas.

### Choices

Choice (4) Response

a.

1: 9

b.

16: 3

c.

7: 9

d.

1: 16

## Question number: 26

» Mensuration

MCQ▾

### Question

The radius of a cylinder is tripled but its lateral surface area is unchanged. Then its height must be________.

### Choices

Choice (4) Response

a.

Halved

b.

One third

c.

Doubled

d.

Constant

## Question number: 27

» Mensuration

MCQ▾

### Question

A cylindrical tower is 7 meters in diameter and 15 meters height. The cost of white washing its curved surface at 75 paisa per is

### Choices

Choice (4) Response

a.

257

b.

250

c.

240

d.

247

## Question number: 28

» Mensuration

MCQ▾

### Question

A hoop is resting vertically at staircase as shown in the diagram. AB = 8 cm and BC = 4 cm. The radius of the hoop is________.

### Choices

Choice (4) Response

a.

12 cm

b.

10 cm

c.

14 cm

d.

11 cm

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