# Mathematics [NSTSE (National Science Talent Search Exam- Unified Council) Class 9]: Questions 663 - 669 of 989

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## Question 663

Edit

### Question

MCQ▾

The point (-2,5) belongs to Quadrant ________.

### Choices

Choice (4)Response

a.

b.

c.

d.

## Question 664

Mathematics
Edit

### Question

MCQ▾

If the angles of a triangle are in the ratio 1: 2: 7 then the triangle is

### Choices

Choice (4)Response

a.

Right angled isosceles

b.

Right angled

c.

Obtuse angled

d.

Acute angled

## Question 665

Mathematics
Edit

### Question

MCQ▾

Which of the following statement (s) is true?

### Choices

Choice (4)Response

a.

, where a and b are rational numbers

b.

Infinite number of rational numbers lie between any two rational number

c.

if where ‘a’ is a rational number

d.

All a. , b. and c. are correct

## Question 666

Mathematics
Edit

### Question

MCQ▾

The triangle formed by and is

### Choices

Choice (4)Response

a.

An obtuse angle triangle

b.

An acute angle triangle

c.

A right angled triangle

d.

All of the above

## Question 667

Mathematics
Edit

### Question

MCQ▾

The mean of 10 observations is 15.8. By error, one observation was noted as -12 instead of 12. Then the correct mean is

### Choices

Choice (4)Response

a.

25.8

b.

18.2

c.

18.5

d.

5.8

## Question 668

Mathematics
Edit

### Question

MCQ▾

In a , if , then the right angle is at

### Choices

Choice (4)Response

a.

A

b.

C

c.

B

d.

None of the above

## Question 669

Edit

### Question

MCQ▾

The equation of the line parallel to x-axis is ________.

### Choices

Choice (4)Response

a.

b.

c.

d.