IMO- Mathematics Olympiad Class 8: Questions 437 - 442 of 1029

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Question number: 437

» Mensuration

MCQ▾

Question

Three cubes whose edges are 3 cm, 4 cm, and 5 cm respectively are melted without any loss of metal into a single cube. The edge of new cube is________.

Choices

Choice (4) Response

a.

9cm

b.

8cm

c.

6cm

d.

7cm

Question number: 438

» Mensuration

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.

53cm2

b.

42cm2

c.

46cm2

d.

60cm2

Question number: 439

» Mensuration

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

» Mensuration

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.

223m2

b.

204m2

c.

300m2

d.

345m2

Question number: 441

» Mensuration

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

» Mensuration

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.

215cm2

b.

211cm2

c.

210cm2

d.

216cm2

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