IMO- Mathematics Olympiad Class 8: Questions 124 - 132 of 1029

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Question number: 124

» Square and Square Roots

MCQ▾

Question

A number is multiplied by 212 itself and then 15 is subtracted from the product. If the final result is 2545, then find the original number.

Choices

Choice (4) Response

a.

13

b.

30

c.

32

d.

31

Question number: 125

» Square and Square Roots

MCQ▾

Question

The area of a square field is 21054625 sq. m. The length of each side of the field is ________.

Choices

Choice (4) Response

a.

4.00

b.

1.92

c.

2.00

d.

2.50

Question number: 126

» Square and Square Roots

MCQ▾

Question

The number must be subtracted from 13245 to get a perfect square is________.

Choices

Choice (4) Response

a.

11

b.

20

c.

15

d.

10

Question number: 127

» Square and Square Roots

MCQ▾

Question

Find the smallest square number which is exactly divisible by 15, 25, and 30 is, ________

Choices

Choice (4) Response

a.

100

b.

180

c.

500

d.

900

Question number: 128

» Square and Square Roots

MCQ▾

Question

The value of 1×1 is________.

Choices

Choice (4) Response

a.

0

b.

±1

c.

1

d.

+1

Question number: 129

» Square and Square Roots

MCQ▾

Question

If (217121)=(1+x11) , then x equals________.

Choices

Choice (4) Response

a.

3

b.

1

c.

4

d.

2

Question number: 130

» Square and Square Roots

MCQ▾

Question

The value of 2×2 is________.

Choices

Choice (4) Response

a.

2

b.

2i

c.

+2i

d.

Both b. and c. are correct

Question number: 131

» Square and Square Roots

MCQ▾

Question

The least two digit number, which is a perfect square is ________

Choices

Choice (4) Response

a.

4

b.

16

c.

12

d.

9

Question number: 132

» Square and Square Roots

MCQ▾

Question

Find the smallest square number which is exactly divisible by 8, 12, 15, and 20 is, ________

Choices

Choice (4) Response

a.

3600

b.

2500

c.

900

d.

180

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