# IMO Level 1- Mathematics Olympiad (SOF) Class 8: Questions 450 - 455 of 1040

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## Question number: 450

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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

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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: 14

b.

12: 3

c.

1: 12

d.

1: 15

## Question number: 452

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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

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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 4600

b.

Rs 4100

c.

Rs 4400

d.

Rs 4000

## Question number: 454

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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________. PQRS Rectangle is Inscribed in a Circle of Center O and radiusR Find out total area of shaded region of inscribing rectangle in a circle

### Choices

Choice (4) Response

a.

b.

c.

d.

## Question number: 455

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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.

2.856 kg

b.

4.561 kg

c.

1.860 kg

d.

1.99 kg