Suresh Lecturer

Chapter 3: Coordinate Geometry

Class 9 Maths Chapter 3 introduces Coordinate Geometry, covering the Cartesian system, coordinate axes, origin, quadrants, and how to plot points in the Cartesian plane. These topics are vital for the examination.

To know your total score, there is a button at the bottom of the last question. Click it to see your score.
There is no negative marking.

2920

1. If $\mathrm{P}(5,1), \mathrm{Q}(8,0), \mathrm{R}(0,4), \mathrm{S}(0,5)$ and $\mathrm{O}(0,0)$ are plotted on the graph paper, then the point(s) on the $x$-axis are

$\mathrm{P}$ and $\mathrm{R}$

$\mathrm{R}$ and $\mathrm{S}$

Only $\mathrm{Q}$

$\mathrm{Q}$ and $\mathrm{O}$

2908

2. Point $(-10,0)$ lies

on the negative direction of the $x$-axis

on the negative direction of the $y$-axis

in the third quadrant

in the fourth quadrant

2927

3. The point which lies on $y$-axis at a distance of 5 units in the negative direction of $y$-axis is

$(0,5)$

$(5,0)$

$(0,-5)$

$(-5,0)$

2925

4. The point whose ordinate is 4 and which lies on $y$-axis is

$\quad(4,0)$

$(1,4)$

$(0,4)$

$\quad(4,2)$

2918

5. If $\mathrm{P}(-1,1), \mathrm{Q}(3,-4), \mathrm{R}(1,-1), \mathrm{S}(-2,-3)$ and $\mathrm{T}(-4,4)$ are plotted on the graph paper, then the point(s) in the fourth quadrant are

$\mathrm{P}$ and $\mathrm{T}$

$\mathrm{Q}$ and $\mathrm{R}$

Only $\mathrm{S}$

$\mathrm{P}$ and $\mathrm{R}$

2921

6. Abscissa of a point is positive in

I and II quadrants

I and IV quadrants

I quadrant only

II quadrant only

2922

7. The points whose abscissa and ordinate have different signs will lie in

I and II quadrants

II and III quadrants

I and III quadrants

II and IV quadrants

2910

8. Ordinate of all points on the $x$-axis is

0

1

-1

any number

2909

9. Abscissa of all the points on the $x$-axis is

0

1

2

any number

2916

10. If the perpendicular distance of a point $\mathrm{P}$ from the $x$-axis is 5 units and the foot of the perpendicular lies on the negative direction of $x$-axis, then the point $\mathrm{P}$ has

$x$ coordinate $=-5$

$y$ coordinate $=5$ only

$y$ coordinate $=-5$ only

$y$ coordinate $=5$ or -5

2926

11. Which of the points $\mathrm{P}(0,3)$, $\mathrm{Q}(1,0), \mathrm{R}(0,-1), \mathrm{S}(-5,0)$, $\mathrm{T}(1,2)$ do not lie on the $x$-axis?

P and R only

$Q$ and $S$ only

P, R and $\mathrm{T}$

$\mathrm{Q}, \mathrm{S}$ and $\mathrm{T}$

2914

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

in I quadrant

in II quadrant

on $x$ - axis

on $y$-axis

2907

13. Point $(0,-7)$ lies

on the $x$-axis

in the second quadrant

on the $y$-axis

in the fourth quadrant

2915

14. The points $(-5,2)$ and $(2,-5)$ lie in the

same quadrant

II and III quadrants, respectively

II and IV quadrants, respectively

IV and II quadrants, respectively

2904

15. The points (other than origin) for which abscissa is equal to the ordinate will lie in

I quadrant only

I and II quadrants

I and III quadrants

II and IV quadrants

Brief Revision of Coordinate Geometry

In the Cartesian plane, the horizontal line is called the $x$-axis and the vertical line is called the $y$-axis.
The coordinate axes divide the plane into four parts called quadrants.
The point of intersection of the axes is called the origin.
Abscissa or the $x$-coordinate of a point is its distance from the $y$-axis and the ordinate or the $y$-coordinate is its distance from the $x$-axis.
$(x, y)$ are called the coordinates of the point whose abscissa is $x$ and the ordinate is $y$.

Coordinates of a point on the $x$-axis are of the form $(x, 0)$ and that of the point on the $y$-axis is of the form $(0, y)$. The coordinates of the origin are $(0, 0)$.
Signs of the coordinates of a point in the first quadrant are $(+, +)$, in the second quadrant $(-, +)$, in the third quadrant $(-, -)$ and in the fourth quadrant $(+, -)$.

Conclusion

The Chapter 3: Coordinate Geometry of Class 9 Maths provides the foundational understanding of the coordinate system and how to plot points. It includes essential concepts and questions that are useful for exams.