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NCERT Exemplar · Class 9 · Maths

Chapter 3: Coordinate Geometry

Practice each question, then open the answer or worked solution.

Exercise 3.1

Textbook page 25 · 12 questions
Q1Written answer

Point (–3, 5) lies in the

A. first quadrant

B. second quadrant

C. third quadrant
D. fourth quadrant

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Worked solution

B. Second Quadrant

Explanation:

(-3,5) is of form (-x,y).

In the point (-3, 5), the abscissa is negative, and the ordinate is positive. So, it lies in the second quadrant.

Hence, (B) is the correct option.

Q2Written answer

Signs of the abscissa and ordinate of a point in the second quadrant are, respectively

A. +, +
B. –, –
C. –, +
D. +, –

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Worked solution

C. –, +

Explanation:

Signs of the abscissa and ordinate of a point in the second quadrant is –, +.

Hence, (C) is the correct option.

Q3Written answer

Point (0, –7) lies

A. on the x-axis
B. in the second quadrant
C. on the y-axis
D. in the fourth quadrant

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Worked solution

C. on the y-axis

Explanation:

Since the abscissa is 0, Point (0, –7) lies on the y-axis.

Hence, (C) is the correct option.

Q4Written answer

Point (– 10, 0) lies

A. on the negative direction of the x-axis
B. on the negative direction of the y-axis
C. in the third quadrant
D. in the fourth quadrant

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Worked solution

A. on the negative direction of the x-axis

Explanation:

Point (– 10, 0) lies on the negative direction of the x-axis.

Hence, (A) is the correct option.

Q5Written answer

Abscissa of all the points on the x-axis is

A. 0
B. 1
C. 2
D. any number

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Worked solution

D. any number

Explanation:

Abscissa of all the points on the x-axis can be any number.

Hence, (D) is the correct option.

Q6Written answer

Ordinate of all points on the x-axis is

A. 0
B. 1
C. – 1
D. any number

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Worked solution

A. 0

Explanation:

The ordinate of all the points on the x-axis is 0.

Hence, (A) is the correct option.

Q7Written answer

The point at which the two coordinate axes meet is called the

A. abscissa
B. ordinate
C. origin
D. quadrant

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Worked solution

C. origin

Explanation:

The points at which the two coordinate axes meet is called the origin.

Hence, (C) is the correct option.

Q8Written answer

A point both of whose coordinates are negative will lie in

A. I quadrant
B. II quadrant
C. III quadrant
D. IV quadrant

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Worked solution

C. III quadrant

Explanation:

A point whose both of the coordinates are negative will lie in the III quadrant.

Hence, (C) is the correct option.

Q9Written answer

Points (1, – 1), (2, – 2), (4, – 5), (– 3, – 4)

A. lie in II quadrant
B. lie in III quadrant
C. lie in IV quadrant
D. do not lie in the same quadrant

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Worked solution

D. do not lie in the same quadrant

Explanation:

Points (1, – 1), (2, – 2), (4, – 5) lie in IV quadrant and (– 3, – 4) lie in III quadrant.

Hence, (D) is the correct option.

Q10Written answer

If y coordinate of a point is zero, then this point always lies

A. in I quadrant

B. in II quadrant

C. on x-axis

D. on y-axis

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Worked solution

C. on x-axis

Explanation:

We know that if the y-coordinate of a point, i.e., the ordinate is zero, then this point always lies on

x-axis.

Hence, (C) is the correct option.