# IMO- Mathematics Olympiad Class 8: Questions 438 - 443 of 1029

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## Question number: 438

MCQ▾

### Question

If a wire is bent into the shape of a square, then the area of the square is 49 sq. cm. When the wire is bent into a semicircular shape, then the area of the semi-circle will be________.

### Choices

Choice (4) Response

a.

b.

c.

d.

## Question number: 439

MCQ▾

### Question

A child walked 13 m to cross a rectangular field diagonally. If breadth of field is 5 m, its length is________.

### Choices

Choice (4) Response

a.

11 m

b.

20 m

c.

12 m

d.

15 m

## Question number: 440

MCQ▾

### Question

The perimeter of a trapezoid is 80 cm and its non-parallel sides are each equal to 17 cm and its altitude is 15 cm. Its area is________.

### Choices

Choice (4) Response

a.

b.

c.

d.

## Question number: 441

MCQ▾

### Question

The radii of the bases of two cylinders are in the ratio of 2: 3 respectively and their heights are in the ratio 1: 2 respectively, find the ratio of their volumes.

### Choices

Choice (4) Response

a.

3: 2

b.

1: 3

c.

3: 4

d.

2: 3

## Question number: 442

MCQ▾

### Question

Three solid cubes of sides 3 cm, 4 cm and 5 cm are melted to form a new cube. Find the surface area of the cube so formed.

### Choices

Choice (4) Response

a.

b.

c.

d.

## Question number: 443

MCQ▾

### Question

Between a square of perimeter 64 cm and a circle of circumference 64 cm, which figure has larger area and by how much?

### Choices

Choice (4) Response

a.

Circle, 70

b.

Circle, 60

c.

Square, 70

d.

None of the above

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