# NSTSE (National Science Talent Search Exam- Unified Council) Class 9: Questions 742 - 748 of 2000

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## Question number: 742

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MCQ▾

= ________.

### Choices

Choice (4) Response

a.

b.

c.

d.

0

## Question number: 743

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MCQ▾

### Question

25 years ago, when my parents got married, their average age was 30 years, now the average age of my family, consisting of myself and my parents only is 40 years. My present age is

### Choices

Choice (4) Response

a.

10 years

b.

12 years

c.

20 years

d.

18 years

## Question number: 744

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MCQ▾

### Question

The mean of 7, x, 11, y and 21 is 14. Then

### Choices

Choice (4) Response

a.

b.

c.

d.

## Question number: 745

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MCQ▾

### Question

The greatest among is

### Choices

Choice (4) Response

a.

b.

c.

d.

Question does not provide sufficient data or is vague

## Question number: 746

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MCQ▾

### Question

A book containing 400 pages is opened at random. The probability that a triplet page is found is

### Choices

Choice (4) Response

a.

b.

c.

d.

Question does not provide sufficient data or is vague

## Question number: 747

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MCQ▾

### Question

A cylindrical vessel of diameter 16 cm is partly filled with water. 180 lead balls are dropped in it. The raise in water level is 1.4 cm. The diameter of each ball is ________.

### Choices

Choice (4) Response

a.

b.

c.

d.

## Question number: 748

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MCQ▾

### Question

Which of the following statements is correct?

### Choices

Choice (4) Response

a.

0 is called the additive identity for rational number

b.

1 is called the multiplicative identity for rational number

c.

The additive inverse of 0 is zero itself

d.

All a. , b. and c. are correct

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