# IMO Level 1- Mathematics Olympiad (SOF) Class 8: Questions 452 - 457 of 1042

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## Question 452

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### Question

MCQ▾

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 453

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### Question

MCQ▾

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 454

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### Question

MCQ▾

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.

## Question 455

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### Question

MCQ▾

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

## Question 456

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### Question

MCQ▾

If the area of a triangle with base a is equal to area of a square of side a, the altitude of the triangle is________.

### Choices

Choice (4)Response
a.
b.
c.
d.

## Question 457

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### Question

MCQ▾

Two cubes have their volumes in the ratio 1: 64. Find the ratio of their surface areas.

### Choices

Choice (4)Response
a.7: 9
b.1: 16
c.16: 3
d.1: 9