# Mathematics [NSTSE (National Science Talent Search Exam- Unified Council) Class 9]: Questions 723 - 730 of 989

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## Question 723

Mathematics
Edit

MCQ▾

is

### Choices

Choice (4)Response

a.

An integer

b.

Imaginary

c.

Irrational

d.

Rational

## Question 724

Mathematics
Edit

### Question

MCQ▾

The average of A & B is 20, B & C is 22, C & A is 26. Then the average of A, B & C [approximately] is

### Choices

Choice (4)Response

a.

21

b.

24

c.

42

d.

23

## Question 725

Edit

### Question

MCQ▾

The total surface area of a cylinder is 220 sq cm with height 6.5 cm. Then its volume is

### Choices

Choice (4)Response

a.

b.

c.

d.

## Question 726

Mathematics
Edit

### Question

MCQ▾

The area of a rhombus is 24 and one of its diagonal is 8 cm. Its perimeter is

### Choices

Choice (4)Response

a.

18 cm

b.

20 cm

c.

32 cm

d.

16 cm

## Question 727

Mathematics
Edit

### Question

MCQ▾

In a and is twice that of . Then =

### Choices

Choice (4)Response

a.

b.

c.

d.

## Question 728

Mathematics
Edit

### Question

MCQ▾

If A: Rational numbers are always closed under division and

R: Division by zero is not defined, then which of the following statement is correct?

### Choices

Choice (4)Response

a.

A is True and R is False

b.

A is True and R is the correct explanation of A

c.

A is False and R is the correct explanation of A

d.

None of the above

## Question 729

Mathematics
Edit

### Question

MCQ▾

The value of a if and .

### Choices

Choice (4)Response

a.

19

b.

5

c.

14

d.

-11

## Question 730

Mathematics
Edit

### Question

MCQ▾

What must be subtracted from to get ?

### Choices

Choice (4)Response

a.

b.

c.

d.