Mathematics
Q. Evaluate the limit lim (x -> 0) (sin(5x)/x) and determine its continuity.
A.
5, Continuous
B.
0, Continuous
C.
5, Not Continuous
D.
0, Not Continuous
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Solution
Using the limit property, lim (x -> 0) (sin(5x)/x) = 5. The function is continuous at x = 0.
Correct Answer: A — 5, Continuous
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Q. Evaluate the limit lim x→2 (x^2 - 4)/(x - 2).
A.
0
B.
2
C.
4
D.
Undefined
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Solution
Using L'Hôpital's Rule, lim x→2 (x^2 - 4)/(x - 2) = lim x→2 (2x)/(1) = 4.
Correct Answer: C — 4
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Q. Find the area between the curves y = x and y = x^2 from x = 0 to x = 1.
A.
0.5
B.
1
C.
0.25
D.
0.75
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Solution
The area between the curves is given by ∫(from 0 to 1) (x - x^2) dx = [x^2/2 - x^3/3] from 0 to 1 = (1/2 - 1/3) = 1/6 = 0.5.
Correct Answer: A — 0.5
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Q. Find the area under the curve y = 3x^2 from x = 1 to x = 2.
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Solution
The area under the curve is given by ∫(from 1 to 2) 3x^2 dx = [x^3] from 1 to 2 = (8 - 1) = 7.
Correct Answer: B — 6
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Q. Find the coefficient of x^2 in the expansion of (2x - 3)^4.
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Solution
Using the binomial theorem, the coefficient of x^2 in (2x - 3)^4 is given by 4C2 * (2)^2 * (-3)^2 = 6 * 4 * 9 = 216.
Correct Answer: C — 54
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Q. Find the derivative of f(x) = x^4 - 4x^3 + 6x^2 - 24x + 5. (2023)
A.
4x^3 - 12x^2 + 12x - 24
B.
4x^3 - 12x^2 + 6x - 24
C.
4x^3 - 12x^2 + 12x
D.
4x^3 - 12x^2 + 6x
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Solution
Using the power rule, f'(x) = 4x^3 - 12x^2 + 12x - 24.
Correct Answer: A — 4x^3 - 12x^2 + 12x - 24
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Q. Find the derivative of g(x) = sin(x) + cos(x). (2020)
A.
cos(x) - sin(x)
B.
-sin(x) - cos(x)
C.
sin(x) + cos(x)
D.
-cos(x) + sin(x)
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Solution
Using the derivatives of sine and cosine, g'(x) = cos(x) - sin(x).
Correct Answer: A — cos(x) - sin(x)
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Q. Find the distance between the points (-1, -1) and (2, 2).
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Solution
Using the distance formula: d = √[(2 - (-1))² + (2 - (-1))²] = √[9 + 9] = √18 = 3√2.
Correct Answer: C — 5
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Q. Find the distance between the points (-2, -3) and (4, 5).
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Solution
Using the distance formula: d = √[(4 - (-2))² + (5 - (-3))²] = √[(4 + 2)² + (5 + 3)²] = √[36 + 64] = √100 = 10.
Correct Answer: B — 7
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Q. Find the distance between the points (0, 0) and (x, y) where x = 6 and y = 8.
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Solution
Using the distance formula: d = √[(6 - 0)² + (8 - 0)²] = √[36 + 64] = √100 = 10.
Correct Answer: A — 10
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Q. Find the eigenvalues of the matrix G = [[5, 4], [2, 3]]. (2020)
A.
1, 7
B.
2, 6
C.
3, 5
D.
4, 4
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Solution
The eigenvalues are found by solving the characteristic equation det(G - λI) = 0. This gives λ^2 - 8λ + 7 = 0, which factors to (λ - 1)(λ - 7) = 0, hence λ = 1, 7.
Correct Answer: A — 1, 7
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Q. Find the equation of the line passing through the points (2, 3) and (4, 7). (2020)
A.
y = 2x - 1
B.
y = 2x + 1
C.
y = 3x - 3
D.
y = 2x + 3
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Solution
The slope m = (7 - 3) / (4 - 2) = 2. Using point-slope form: y - 3 = 2(x - 2) gives y = 2x + 1.
Correct Answer: B — y = 2x + 1
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Q. Find the local maxima of f(x) = -x^2 + 6x - 8. (2022)
A.
(3, 1)
B.
(2, 2)
C.
(4, 0)
D.
(1, 5)
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Solution
f'(x) = -2x + 6; setting to 0 gives x = 3; f(3) = -3^2 + 6(3) - 8 = 1.
Correct Answer: A — (3, 1)
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Q. Find the point of intersection of the lines 2x + 3y = 6 and x - y = 1. (2020)
A.
(0, 2)
B.
(2, 0)
C.
(1, 1)
D.
(3, 0)
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Solution
Solving the equations simultaneously, we find the intersection point is (1, 1).
Correct Answer: C — (1, 1)
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Q. Find the scalar product of A = 2i + 3j + k and B = i + 2j + 3k. (2020)
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Solution
A · B = (2)(1) + (3)(2) + (1)(3) = 2 + 6 + 3 = 11
Correct Answer: A — 14
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Q. Find the second derivative of f(x) = 4x^4 - 2x^3 + x. (2019)
A.
48x^2 - 12x + 1
B.
48x^3 - 6
C.
12x^2 - 6
D.
12x^3 - 6x
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Solution
First derivative f'(x) = 16x^3 - 6x^2 + 1. Second derivative f''(x) = 48x^2 - 12x.
Correct Answer: A — 48x^2 - 12x + 1
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Q. Find the second derivative of f(x) = x^3 - 3x^2 + 4. (2020)
A.
6x - 6
B.
6x + 6
C.
3x^2 - 6
D.
3x^2 + 6
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Solution
First derivative f'(x) = 3x^2 - 6x; second derivative f''(x) = 6x - 6.
Correct Answer: A — 6x - 6
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Q. Find the value of (1 + i)².
A.
2i
B.
2
C.
0
D.
1 + 2i
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Solution
(1 + i)² = 1² + 2(1)(i) + i² = 1 + 2i - 1 = 2i.
Correct Answer: B — 2
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Q. Find the value of the coefficient of x^4 in the expansion of (x - 2)^6.
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Solution
Using the binomial theorem, the coefficient of x^4 in (a + b)^n is given by nCk * a^(n-k) * b^k. Here, n=6, a=x, b=-2, and k=2. Thus, the coefficient is 6C2 * (1)^4 * (-2)^2 = 15 * 4 = 60.
Correct Answer: C — 30
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Q. For the data set: 1, 2, 3, 4, 5, what is the variance? (2022)
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Solution
Mean = (1 + 2 + 3 + 4 + 5) / 5 = 3. Variance = [(1-3)² + (2-3)² + (3-3)² + (4-3)² + (5-3)²] / 5 = 2.
Correct Answer: B — 1.5
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Q. For the equation x^3 - 6x^2 + 11x - 6 = 0, what is the product of the roots? (2019)
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Solution
The product of the roots of the cubic equation ax^3 + bx^2 + cx + d = 0 is given by -d/a. Here, d = -6 and a = 1, so the product is -(-6)/1 = 6.
Correct Answer: A — 6
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Q. For the equation x^3 - 6x^2 + 11x - 6 = 0, which of the following is a root?
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Solution
By substituting x = 2 into the equation, we find that 2 is a root since 2^3 - 6(2^2) + 11(2) - 6 = 0.
Correct Answer: B — 2
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Q. For the function f(x) = sin(x) + cos(x), what is f'(π/4)? (2023)
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Solution
f'(x) = cos(x) - sin(x). At x = π/4, f'(π/4) = cos(π/4) - sin(π/4) = √2/2 - √2/2 = 0.
Correct Answer: B — √2
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Q. For the parabola defined by the equation x^2 = 16y, what is the distance from the vertex to the focus?
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Solution
In the equation x^2 = 4py, we have 4p = 16, thus p = 4. The distance from the vertex to the focus is 4.
Correct Answer: B — 4
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Q. For the polynomial x^3 - 3x^2 + 3x - 1, what is the nature of its roots? (2020)
A.
All real and distinct
B.
All real and equal
C.
One real and two complex
D.
All complex
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Solution
The polynomial can be factored as (x-1)^3, indicating that it has one real root with multiplicity 3, hence all roots are real and equal.
Correct Answer: B — All real and equal
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Q. For the polynomial x^3 - 3x^2 + 3x - 1, which of the following is true about its roots?
A.
All roots are real
B.
All roots are complex
C.
One root is real
D.
Two roots are real
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Solution
The polynomial can be factored as (x - 1)^3, indicating that all roots are real and equal.
Correct Answer: A — All roots are real
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Q. For the quadratic equation 2x^2 + 4x + 2 = 0, what is the value of the discriminant? (2020)
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Solution
The discriminant D = b^2 - 4ac = 4^2 - 4(2)(2) = 16 - 16 = 0.
Correct Answer: A — 0
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Q. For the quadratic equation x^2 - 4x + 4 = 0, what type of roots does it have? (2019)
A.
Real and distinct
B.
Real and equal
C.
Complex
D.
None of the above
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Solution
The discriminant is 0, indicating that the roots are real and equal.
Correct Answer: B — Real and equal
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Q. For which value of k does the equation x^2 + kx + 16 = 0 have equal roots? (2019)
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Solution
For equal roots, the discriminant must be zero: k^2 - 4*1*16 = 0. Solving gives k = -8.
Correct Answer: B — -4
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Q. For which value of k is the function f(x) = { kx + 1, x < 2; 3, x = 2; 2x - 1, x > 2 } continuous at x = 2?
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Solution
To ensure continuity at x = 2, k(2) + 1 must equal 3. Thus, k = 1.
Correct Answer: B — 2
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