Q21.If −2x + 15 < −13, then:
Correct answer: x ∈ (14, ∞)
Q22.The solution of the equations √3x − √7y = 0 and √8x − √3y = 0 is:
Correct answer: x = 0, y = 0
Q23.The remainder when x⁴ + 15x³ + 6x² − 12x + 3 is divided by (x + 2) is:
Correct answer: −53
Q24.The solution set of equation x⁴ − 5x² + 6 = 0 is:
Correct answer: ±√2, ±√3
Q25.If one root of the equation ax² + bx + c = 0 is 3 − 4i, then 31a + b + c = ________.
Correct answer: 2c
Q26.If x is real, then the value of (x² + 34x − 71)/(x² + 2x − 7) cannot lie between:
Correct answer: 5 and 9
Q27.Cauchy-Schwartz inequality is:
Correct answer: (Σab)² ≤ Σa²Σb²
Q28.If the zeroes of the expression (3x + 2a)(2x + 1) are −1/2 and b/3, then the value of 'a' is:
Correct answer: −b/2
Q29.The solution set of 2x − 1 > x + (7 − x)/3 > 2, x ∈ R is:
Correct answer: (5/2, ∞)
Q30.If b ≠ 0 and a/b > 0, then which of the following inequalities must be true?
Correct answer: ab > 0
Q31.The general form of the linear equation in two variables x, y is:
Correct answer: ax + by + c = 0, a ≠ 0, b ≠ 0
Q32.The value of m so that the equation 3x2 – 2mx – 4 = 0 and x(x –4m) + 2 = 0 may have a common root is:
Correct answer: 1/ 2/±
Q33.If x, y, z ∈ R and x < y, then:
Correct answer: xz > yz,z < 0
Q34.If α, β are the roots of x2 – k(x + 1) – c = 0, then (1 + α) (1 + β) = ________.
Correct answer: 1 – c
Q35.If (x4 + ax3 – 7x2 – 8x + b) is completely divisible by x2 + 5x + 6, then the values of a and b are:
Correct answer: 2, 12
Q36.The sum of the series 3.8 + 6.11 + 9.14 + ….to n terms is:
Correct answer: 3n(n + 1) (n + 3)
Q37.If x2 + bx + a = 0, ax2 + x + b = 0 have a common root and the first equation has equal roots, then 2a2 + b = ________.
Correct answer: 0
Q38.If 10 2 4 x y x y + = + − and 15 5 – = –2 x + y x – y then:
Correct answer: x = 3, y = 2
Q39.If 2 3 2 x y + = and 4 9 1 x y − = − then:
Correct answer: x = 4, y = 9
Q40.Number of integral solutions of the inequality x + 2 1 > 2 2 x + 1 is-
Correct answer: 3