# Surface Area and Volumes (IMO- Mathematics Olympiad Class 9): Questions 10 - 13 of 104

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## Question number: 10

» Surface Area and Volumes

MCQ▾

### Question

27 metal balls each of radius r are melted together to from one big sphere of radius R. Then the ratio of surface area of the big sphere to that of a ball is ________

### Choices

Choice (4) Response

a.

3

b.

9

c.

d.

## Question number: 11

» Surface Area and Volumes

MCQ▾

### Question

A rectangle is divided into four smaller rectangles, as shown in the figure. Three of them have areas, and as indicated. Then the area of the shaded rectangle is ________

### Choices

Choice (4) Response

a.

b.

c.

d.

## Question number: 12

» Surface Area and Volumes

MCQ▾

### Question

A rectangular field has its length and breadth in the ratio. Its area is 3.75 hectares. The cost of fencing it at Rs. 5 per meter is ________

### Choices

Choice (4) Response

a.

Rs. 1000

b.

Rs. 500

c.

Rs. 4000

d.

Rs. 400

## Question number: 13

» Surface Area and Volumes

MCQ▾

### Question

If the altitude of an equilateral triangle is , its area is ________

### Choices

Choice (4) Response

a.

b.

c.

d.

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