NCERT Class 10 Math Chapter 4 MCQ Question Answer – Quadratic Equations

Class 10
Chapter  Quadratic Equations
Subject Math
Category MCQ

Class 10 Math Chapter 4 MCQ Question Answer


1. Which of the following is a quadratic equation?
(A) (x+1)=(x-3)2
(B) (x+4)3 = 3x(x + 1)
(C) 4x²+5= (2x+7)2
(D) (x-2) (x+1) = (x-1) (x+3)

Answer

Ans – (A) (x+1)=(x-3)2


2. Which of the following is a quadratic equation?
(A) (x-1)(x+3) = (x-7) (x+5)
(B) (2x-1)(2x+1) = (x-2)2
(C) (x+4)3 = 3x(x + 1)
(D) 4x² + 5 = (2x+7)2

Answer

Ans – (B) (2x-1)(2x + 1) = (x-2)2


3. If the roots of the quadratic equation 2x²+kx+2=0 are equal, then the value of k is :
(A) +2
(B) ±5
(C) ±3
(D) ±4

Answer

Ans – (D) ±4


4. Choose the correct option: If the roots of the quadratic equation 3x²+kx+3=0 are equal, then the value of k is:
(A) ±6
(B) ±3
(C) ±9
(D) None of these

Answer

Ans – (A) ±6


5. The value of k for which the roots of 2x² + kx + 3 = 0 are equal, is:
(A) 0
(B) ± 24
(C)  \displaystyle \pm 2\sqrt{6}
(D)  \displaystyle \pm \sqrt{6}

Answer

Ans – (C)  \displaystyle \pm 2\sqrt{6}


6. Roots of equation 3x² + x – 4 = 0 are :

(A)  \displaystyle -1,\frac{4}{3}

(B)  \displaystyle 1,-\frac{4}{3}

(C) 3,-4
(D) None of these

Answer

Ans – (B)  \displaystyle 1,-\frac{4}{3}


7. Discriminant of equation 2x² + x – 6=0 is :
(A) 49
(B) 7
(C)-12
(D) None of these

Answer

Ans – (A) 49


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