RD Sharma Class 10 Solutions Chapter 3 MCQs (Updated for 2024)

RD Sharma Class 10 Solutions Chapter 3 MCQs

RD Sharma Class 10 Solutions Chapter 3 MCQs: Students can download the RD Sharma Class 10 Solutions Chapter 3 MCQs PDF to learn how to solve the questions in this exercise correctly. Students wishing to brush up on their concepts can check the RD Sharma Class 10 Solutions.

Access RD Sharma Class 10 Solutions Chapter 3 MCQs PDF

Mark the correct alternative in each of the following.
Question 1.
The value of k for which the system of equations. kx – y = 2, 6x – 2y = 3 has a unique solution is
(a) = 3
(b) ≠ 3
(c) ≠ 0
(d) = 0
Solution:
(b)
RD Sharma Class 10 Solutions Chapter 3 Pair of Linear Equations in Two Variables MCQS 1
RD Sharma Class 10 Solutions Chapter 3 Pair of Linear Equations in Two Variables MCQS 2

Question 2.
The value of k for which the system of equations 2x + 3y = 5, 4x + ky = 10 has infinitely number of solutions, is
(a) 1
(b) 3
(c) 6
(d) 0
Solution:
(c)
RD Sharma Class 10 Solutions Chapter 3 Pair of Linear Equations in Two Variables MCQS 3

Question 3.
The value of k for which the system of equations x + 2y – 3 = 0 and 5x + ky + 1 = 0 has no solution, is
(a) 10
(b) 6
(c) 3
(d) 1
Solution:
(a)
RD Sharma Class 10 Solutions Chapter 3 Pair of Linear Equations in Two Variables MCQS 4
RD Sharma Class 10 Solutions Chapter 3 Pair of Linear Equations in Two Variables MCQS 5

Question 4.
The value of k for which the system of equations 3x + 5y = 0 and kx + 10y = 0, has a non-zero solution, is
(a) 0
(b) 2
(c) 6
(d) 8
Solution:
(c)
RD Sharma Class 10 Solutions Chapter 3 Pair of Linear Equations in Two Variables MCQS 6

Question 5.
If the system of equations
2x + 3y = 7
(a + b) x + (2a – b) y = 21
has infinitely many solutions, then
(a) a = 1, b = 5
(b) a = 5, b = 1
(c) a = -1, b = 5
(d) a = 5, b = -1
Solution:
(b)
RD Sharma Class 10 Solutions Chapter 3 Pair of Linear Equations in Two Variables MCQS 7
RD Sharma Class 10 Solutions Chapter 3 Pair of Linear Equations in Two Variables MCQS 8

Question 6.
If the system of equations 3x + y = 1 , (2k – 1) x + (k – 1) y = 2k + 1 is inconsistent, then k =
(a) 1
(b) 0
(c) -1
(d) 2
Solution:
(d)
RD Sharma Class 10 Solutions Chapter 3 Pair of Linear Equations in Two Variables MCQS 9

Question 7.
If am ≠ bl, then the system of equations
ax + by = c
lx + my = n
(a) has a unique solution
(b) has no solution
(c) has infinitely many solutions
(d) may or may not have a solution.
Solution:
(a)
RD Sharma Class 10 Solutions Chapter 3 Pair of Linear Equations in Two Variables MCQS 10
The given system is a unique solution

Question 8.
If the system of equations
2x + 3y = 7
2ax + (a + b) y = 28
has infinitely many solutions, then
(a) a = 2b
(b) b = 2a
(c) a + 2b = 0
(d) 2a + b = 0
Solution:
(b)
RD Sharma Class 10 Solutions Chapter 3 Pair of Linear Equations in Two Variables MCQS 11

Question 9.
The value of k for which the system of equations
x + 2y = 5
3x + ky + 15 = 0 has no solution is
(a) 6
(b) – 6
(c) 32
(d) None of these
Solution:
(a)
RD Sharma Class 10 Solutions Chapter 3 Pair of Linear Equations in Two Variables MCQS 12
k = 6

Question 10.
If 2x – 3y = 7 and (a + b) x – (a + b – 3) y = 4a + b represent coincident lines, then a and b satisfy the equation
(a) a + 5b = 0
(b) 5a + b = 0
(c) a – 56 = 0
(d) 5a – b – 0
Solution:
(c)
RD Sharma Class 10 Solutions Chapter 3 Pair of Linear Equations in Two Variables MCQS 13

Question 11.
If a pair of linear equations in two variables is consistent, then the lines represented by two equations are
(a) intersecting
(b) parallel
(c) always coincident
(d) intersecting or coincident
Solution:
(d) The system of equations is coincident
The lines of their equations are intersecting or coincident

Question 12.
The area of the triangle formed by the line xa+yb=1 with the coordinate axes a is
(a) ab
(b) 2ab
(c) 12 ab
(d) 14 ab
Solution:
(c)
The triangle is formed by the line xa+yb=1 with co-ordinates
It will intersect the x-axis at a and the y-axis at y
Area of the triangle so formed = 12 x a x b = 12 ab

Question 13.
The area of the triangle formed by the lines y = x, x = 6, and y = 0 is
(a) 36 sq. units
(b) 18 sq. units
(c) 9 sq. units
(d) 72 sq. units
Solution:
(b)
The triangle formed by the lines y = x, x = 6, and y = 0 will be an isosceles right triangle whose sides will be 6 units
Area = 12 x 6 x 6 = 18 sq. units

Question 14.
If the system of equations 2x + 3y = 5, 4x + ky = 10 has infinitely many solutions, then k =
(a) 1
(b) 12
(c) 3
(d) 6
Solution:
(d)
RD Sharma Class 10 Solutions Chapter 3 Pair of Linear Equations in Two Variables MCQS 14

Question 15.
If the system of equations kx – 5y = 2, 6x + 2y = 7 has no solution, then k =
(a) -10
(b) -5
(c) -6
(d) -15
Solution:
(d)
RD Sharma Class 10 Solutions Chapter 3 Pair of Linear Equations in Two Variables MCQS 15

Question 16.
The area of the triangle formed by the lines x = 3, y = 4, and x = y is
(a) 12 sq. unit
(b) 1 sq. unit
(c) 2 sq. unit
(d) None of these
Solution:
(a)
The triangle is formed by three lines x = 3, y = 4 and x = y
Its sides containing the right angle will be 1 and 1 units
Area of triangle so formed = 12 x 1 x 1 sq. units = 12 sq. units

Question 17.
The area of the triangle formed by the lines 2x + 3y = 12, x – y – 1 = 0 and x = 0 is
(a) 7 sq. units
(b) 7.5 sq. units
(c) 6.5 sq. units
(d) 6 sq. units
RD Sharma Class 10 Solutions Chapter 3 Pair of Linear Equations in Two Variables MCQS 16
Solution:
(b) In the given graph as shown
The triangle formed by the lines
2x + 3y = 12, x – y – 1 =0 and x = 0
Its base BD = 4 + 1 = 5 units
and perpendicular from P on BD = 6 units
Area = 12 x base x height
= 12 x 5 x 3 = 152 sq. units
= 7.5 square units

Question 18.
The sum of the digits of a two-digit number is 9. If 27 is added to it, the digits of the number get reversed. The number is
(a) 25
(b) 72
(c) 63
(d) 36
Solution:
(d) Since the sum of the digits of a two-digit number is 9, therefore
x + y = 9 …(i)
It says if the digits are reversed, the new number is 27 less than the original.
Since we are looking at the number like xy, to separate them, it is actually 10x + y for x is a tens digit.
10y+ x = 10x + y + 27
Simplify it, we get 9y = 9x + 27
y = x + 3 …(ii)
Substitute (ii) into (i), and we will have
x + (x + 3) = 9
=> 2x + 3 = 9
=> 2x = 6
=> x = 3
Put back into equation (i),
=> 3 + y = 9 => y = 6
The original number is 36.

Question 19.
If x = a, y = b is the solution of the systems of equations x – y = 2 and x + y = 4, then the values of a and b are, respectively
(a) 3 and 1
(b) 3 and 5
(c) 5 and 3
(d) -1 and -3
Solution:
(a) Since, x = a and y = b is the solution of the equations x – y = 2 and x + y = 4, then these values will satisfy that equations.
a – b = 2 …(i)
and a + b = 4 …(ii)
By adding (i) and (ii), we get
2a = 6
Therefore, a = 3
By putting a = 3 in (i), we get
3 – b = 2 Therefore, b = 1
Thus, a = 3 ; b = 1

Question 20.
For what value k, do the equations 3x – y + 8 = 0 and 6x – ky + 16 = 0 represent coincident lines?
(a) 12
(b) – 12
(c) 2
(d) -2
Solution:
(c)
Let 3x – y + 8 = 0 …(i)
and 6x – – ky + 16 = 0 …(ii)
Here, a1 = 3, b1 = -1, c1 = 8
RD Sharma Class 10 Solutions Chapter 3 Pair of Linear Equations in Two Variables MCQS 17

Question 21.
Aruna has only ₹ 1 and ₹ 2 coins with her. If the total number of coins that she has is 50 and the amount of money with her is ₹ 75, then the number of ₹ 1 and ₹ 2 coins are, respectively
(a) 35 and 15
(b) 35 and 20
(c) 15 and 35
(d) 25 and 25
Solution:
(d) Let the number of ₹ 1 coins = x
and number of ₹ 2 coins = y
Now, by given condition x + y = 50 …(i)
Also, x x 1 + y x 2 = 15
=>x + 2y = 75 …(ii)
On subtracting Eq. (i) from Eq. (ii), we get
(x + 2y) – (x + y) = 75 – 50
=> y = 25
When y = 25, then x = 25

We have provided complete details of RD Sharma Class 10 Solutions Chapter 3 MCQs. If you have any queries related to CBSE Class 10, feel free to ask us in the comment section below.

FAQs on RD Sharma Class 10 Solutions Chapter 3 MCQs

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Is it required to practice all of the questions in Chapter 3 MCQs of RD Sharma Solutions for Class 10 Maths?

Yes, all of the questions in RD Sharma Solutions for Class 10 Maths Chapter 3 MCQs must be learned. These questions may appear on both board exams and class tests. Students will be prepared for their board exams if they learn these questions.

What are the benefits of using RD Sharma Class 10 Solutions Chapter 3 MCQs?

1. Correct answers according to the last CBSE guidelines and syllabus.
2. The RD Sharma Class 10 Solutions Chapter 3 MCQs is written in simple language to assist students in their board examination, & competitive examination preparation.

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