Ncert- class10-Maths -Quadratic Equations 1 Welcome to your Ncert- class10-Maths -Quadratic Equations 1 1. Assertion : The roots of the quadratic equation x²+2x+2=0 are imaginaryReason : If discriminant D= b²-4ac <0 then the roots of quadratic equation ax²+bx+c=0 are imaginary Assertion (A) is true but reason (R) is false. Assertion (A) is false but reason (R) is true. Both assertion (A) and reason (R) are true but reason (R) is not the correct explanation of assertion (A). Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A). None 2. The roots of the quadratic equation . x²-0.04 = 0 are ±0.02 2 0.4 ±0.2 None 3. If α and β are the zeroes of the polynomial x² +2x +1, then (1/α) + (1/β) is equal to 1 0 2 -2 None 4. If the sum of the zeroes of the quadratic polynomial kx² +2x+3k is equal to their product, then k equals -2/3 1/3 -1/3 2/3 None 5. Value(s) of k for which the quadratic equation 2x² - kx+k=0 has equal roots is/are 8 0,8 0 4 None 6. Assertion: The equation x²+3x+1 =(x-2)² is a quadratic equationReason : Any equation of the form ax²+bx+c=0 where a≠0 , is called a quadratic equation. Assertion (A) is false but reason (R) is true Assertion (A) is true but reason (R) is false. Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A). Both assertion (A) and reason (R) are true but reason (R) is not the correct explanation of assertion (A). None 7. Assertion: If one root of the quadratic equation 2x² + kx –6 = 0 is 2, the value of k is -1Reason: x = 2 is a root of the equation 2x² + kx -6 = 0Choose the correct answer out of the following choices: Assertion is wrong statement but Reason is correct statement. Assertion and Reason both are correct statements but Reason is not the correct explanation of Assertion. Assertion is correct statement but Reason is wrong statement ) Assertion and Reason both are correct statements and Reason is the correct explanation of Assertion. None 8. If α and β are the zeroes of the polynomial 2x² -13x +6 then α + β is equal to 3 13/2 -13/2 -3 None 9. Assertion : The equation 8x² +3kx +2 =0 has equal roots then the value of k is ±8/3Reanson : The equation ax² +bx +c =0 has equal roots if D= b²-4ac = 0 Assertion (A) is false but reason (R) is true. Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A). Both assertion (A) and reason (R) are true but reason (R) is not the correct explanation of assertion (A). Assertion (A) is true but reason (R) is false. None 10. Assertion : The values of x are -a/2, a for a quadratic equation 2x²+ax+a²=0Reason : For quadratic equation ax² +bx +c = 0$$x=\frac{-b\pm \sqrt{b^{2}-4ac}}{2a}$$ Assertion (A) is true but reason (R) is false Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A). Assertion (A) is false but reason (R) is true. Both assertion (A) and reason (R) are true but reason (R) is not the correct explanation of assertion (A). None 11. The sum and product of the zeroes of a quadratic polynomial are 3 and -10 respectively. The quadratic polynomial is x²-3x-10 x²+3x+10 x²+3x-10 x²-3x+10 None 12. If one root of the quadratic equation ax² +bx +c =0 is the reciprocal of the other, then ac =1 a= c b= c a= b None 13. The linear factors of the quadratic equation x² +kx +1 =0 are 2≤ k≤ -2 k≤ 2 k≥2 k≥ -2 None 14. if x² +y² =25, xy =12 then x is (3, -3 ) (3, 4 , -3, -4) (-3, 3) (3,4) None 15. Assertion: The discriminant of the quadratic equation. 2x² – 4x + 3 = 0, is -8 and hence the nature of its roots is no real roots.Reason: if b²-4ac<0, the nature of root is no real roots. both assertion and reason are false Both Assertion and Reason are correct and Reason is not the correct explanation for Assertion Both Assertion and Reason are correct and Reason is the correct explanation for Assertion assertion is true but the reason is false. None 16. The condition for one root of the quadratic equation ax² + bx +c =0 , to be twice the other, is c² =4a+b² b² =4ac c² =4a - b² 2b² =9ac None 17. The quadratic equation x²+x -5 =0 has no real roots two equal real roots more than 2 real roots two distinct real roots None 18. Assertion : 4x² - 12x +9 =0 has repeated roots.Reason : The quadratic equation ax² +bx +c =0 have repeated roots if dicriminant D>0 Both assertion (A) and reason (R) are true but reason (R) is not the correct explanation of assertion (A). Assertion (A) is true but reason (R) is false. Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion Assertion (A) is false but reason (R) is true. None 19. If ½ is a root of the equation x² +kx -5/4 =0, then the value of k is -2 1/2 2 1/4 None 20. Each root of x² -bx +c =0 is decreased by 2. The resulting equation is x² -2x +1 =0, then b =-4, c= 3 b =2 , c =-1 b = 6, c= 9 b= 3, c =5 None Time's up Please Share This Share this content Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Leave a Reply Cancel replyCommentEnter your name or username to commentEnter your email address to commentEnter your website URL (optional) Save my name, email, and website in this browser for the next time I comment.
