# IMO- Mathematics Olympiad Class 8: Questions 449 - 454 of 1029

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## Question number: 449

MCQ▾

### Question

The radius of the cylinder whose lateral surface area is 610 and height 6 cm, is________.

### Choices

Choice (4) Response

a.

11 cm

b.

12 cm

c.

14 cm

d.

10 cm

## Question number: 450

MCQ▾

### Question

The perimeter of a trapezoid is 60 cm and its non-parallel sides are each equal to 13 cm and its altitude is 12 cm. Its area is________.

### Choices

Choice (4) Response

a.

b.

c.

d.

## Question number: 451

MCQ▾

### Question

The ratio of radii of two cylinders is 1: 3 and heights are in the ratio 3: 5. The ratio of their volume is________.

### Choices

Choice (4) Response

a.

1: 15

b.

12: 3

c.

1: 12

d.

1: 14

## Question number: 452

MCQ▾

### Question

A metal sheet 49 cm long, 7 cm broad and 1 cm thick is melted into a cube. The difference between surface areas of two solids is________.

### Choices

Choice (4) Response

a.

b.

c.

d.

## Question number: 453

MCQ▾

### Question

A rectangle field has its length and breadth in the ratio 5: 3. Its area is 4.50 hectares. The cost of fencing it at Rs. 5 per meter is________.

### Choices

Choice (4) Response

a.

Rs 4000

b.

Rs 4600

c.

Rs 4400

d.

Rs 4100

## Question number: 454

MCQ▾

### Question

In the given figure PQRS is a rectangle inscribed in a circle with center O and radius r. The total area of shaded region is________.

### Choices

Choice (4) Response

a.

b.

c.

d.

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