IMO Level 1- Mathematics Olympiad (SOF) Class 7: Questions 33 - 39 of 1022

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Question number: 33

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Question

An insect crawls up 7 cm every second on an 80 cm vertical rod and then falls down 3 cm over the next second. How many seconds will it take to climb the rod?

Choices

Choice (4) Response

a.

30 seconds

b.

20 seconds

c.

60 seconds

d.

39 seconds

Question number: 34

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Question

Which of the following statements is true?

Choices

Choice (4) Response

a.

The product of two rational numbers is a rational number

b.

Zero has no reciprocal

c.

1 and -1 are reciprocal of themselves

d.

All a. , b. and c. are correct

Question number: 35

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Question

The product of two rational numbers is . If one of the numbers is , then the other number is________.

Choices

Choice (4) Response

a.

22

b.

36

c.

49

d.

27

Question number: 36

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Question

The value of y such that and are equivalent rational numbers is________.

Choices

Choice (4) Response

a.

b.

c.

5

d.

15

Question number: 37

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Question

Simplify

Choices

Choice (4) Response

a.

8

b.

7

c.

d.

Question number: 38

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Question

A gardener plans to plant 630 trees in 21 rows each containing the same number of trees, then how many trees will there be in each row?

Choices

Choice (4) Response

a.

3

b.

30

c.

21

d.

300

Question number: 39

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Question

The sign of the product of one positive integer and one negative integer is________.

Choices

Choice (4) Response

a.

Negative

b.

Positive or Negative

c.

Positive

d.

Cannot be determined