IMO Level 1- Mathematics Olympiad (SOF) Class 8: Questions 459 - 464 of 1042

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Question 459

Question

MCQ▾

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.

250

b.

247

c.

240

d.

257

Question 460

Question

MCQ▾

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.

11 cm

c.

14 cm

d.

10 cm

Question 461

Question

MCQ▾

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

Choices

Choice (4)Response

a.

Tripled

b.

Constant

c.

Doubled

d.

Halved

Question 462

Question

MCQ▾

Between a square of perimeter 36 cm and a circle of circumference 36 cm, which figure has larger area and by how much?

Choices

Choice (4)Response

a.

Square, 22

b.

Circle, 26

c.

Circle, 22

d.

All of the above

Question 463

Question

MCQ▾

Two rectangles ABCD and DBEF are as shown in the figure. The area of rectangle DBEF in square units is________.

Choices

Choice (4)Response

a.

90

b.

60

c.

40

d.

70

Question 464

Question

MCQ▾

A right cylindrical vessel is full with water, how many right cones having half diameter and height as that of right cylinder will be needed to store that water?

Choices

Choice (4)Response

a.

23

b.

24

c.

25

d.

12