Q21. The solution of the equations √3x − √7y = 0 and √8x − √3y = 0 is:
A x = 0, y = 0
B x = 0, y = 1
C x = 8, y = 3
D x = 3, y = 7
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Correct answer: x = 0, y = 0
Q22. The remainder when x⁴ + 15x³ + 6x² − 12x + 3 is divided by (x + 2) is:
A 52
B −52
C 53
D −53
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Correct answer: −53
Q23. The solution set of equation x⁴ − 5x² + 6 = 0 is:
A ±2, ±3
B 1, 2, ±3
C 2, 3
D ±√2, ±√3
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Correct answer: ±√2, ±√3
Q24. If one root of the equation ax² + bx + c = 0 is 3 − 4i, then 31a + b + c = ________.
A 2b
B 2c
C 0
D 2a
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Correct answer: 2c
Q25. If x is real, then the value of (x² + 34x − 71)/(x² + 2x − 7) cannot lie between:
A 6 and 10
B 4 and 8
C 5 and 10
D 5 and 9
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Correct answer: 5 and 9
Q26. Cauchy-Schwartz inequality is:
A (Σab)² ≥ Σa²Σb²
B (Σab)² > Σa²Σb²
C (Σab)² < Σa²Σb²
D (Σab)² ≤ Σa²Σb²
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Correct answer: (Σab)² ≤ Σa²Σb²
Q27. If the zeroes of the expression (3x + 2a)(2x + 1) are −1/2 and b/3, then the value of 'a' is:
A −2b/3
B −b/2
C 2b/3
D −b/3
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Correct answer: −b/2
Q28. The solution set of 2x − 1 > x + (7 − x)/3 > 2, x ∈ R is:
A (−∞, 5/2)
B (5/2, ∞)
C (0, 5/2)
D (0, 5/2]
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Correct answer: (5/2, ∞)
Q29. If b ≠ 0 and a/b > 0, then which of the following inequalities must be true?
A a < 0
B a > b
C b > 0
D ab > 0
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Correct answer: ab > 0
Q30. The general form of the linear equation in two variables x, y is:
A ax + by + c = 0, a ≠ 0, b ≠ 0
B ax + by + c = 0, a ≠ 0
C ax + by + c = 0, |a| + |b| = 0
D ax + by + c = 0, |a| + |b| ≠ 0
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Correct answer: ax + by + c = 0, a ≠ 0, b ≠ 0
Q31. The value of m so that the equation 3x2 – 2mx – 4 = 0 and x(x –4m) + 2 = 0 may have a common root is:
A 1 – 2
B 1/ 2/±
C 1/2
D 3/ 2/±
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Correct answer: 1/ 2/±
Q32. If x, y, z ∈ R and x < y, then:
A xz > yz,z = 0
B xz > yz,z < 0
C xz > yz, z is positive or negative or zero
D xz > yz,z > 0
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Correct answer: xz > yz,z < 0
Q33. If α, β are the roots of x2 – k(x + 1) – c = 0, then (1 + α) (1 + β) = ________.
A 1 – c
B 1
C 1 + c
D c
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Correct answer: 1 – c
Q34. If (x4 + ax3 – 7x2 – 8x + b) is completely divisible by x2 + 5x + 6, then the values of a and b are:
A 2, 12
B 2, 14
C 2, 8
D –2, 6
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Correct answer: 2, 12
Q35. The sum of the series 3.8 + 6.11 + 9.14 + ….to n terms is:
A 3n(n + 1) (n + 3)
B (3n2/+ 3n) (n + 3)
C (n + 3) (n – 1)
D (n – 1)2
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Correct answer: 3n(n + 1) (n + 3)
Q36. If x2 + bx + a = 0, ax2 + x + b = 0 have a common root and the first equation has equal roots, then 2a2 + b = ________.
A 0
B 2
C 1
D –1
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Correct answer: 0
Q37. If 10 2 4 x y x y + = + − and 15 5 – = –2 x + y x – y then:
A x = –3, y = –2
B x = –3, y = 2
C x = 3, y = 2
D x = 3, y = –2
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Correct answer: x = 3, y = 2
Q38. If 2 3 2 x y + = and 4 9 1 x y − = − then:
A x = 2, y = 9
B x = 2, y = 3
C x = 4, y = 3
D x = 4, y = 9
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Correct answer: x = 4, y = 9
Q39. Number of integral solutions of the inequality x + 2 1 > 2 2 x + 1 is-
A 5
B 3
C ∞
D 4
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Correct answer: 3
Q40. A geometric progression has first term 3 and the sum of all its 2n terms is three times the sum of its odd place terms, the common ratio is
A 2
B 3
C 4
D 2
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Correct answer: 2