Q. What is the derivative of f(x) = x^2 * sin(x)? (2023)
A.
2x * sin(x) + x^2 * cos(x)
B.
2x * cos(x) + x^2 * sin(x)
C.
2x * sin(x) - x^2 * cos(x)
D.
x^2 * sin(x) + 2x * cos(x)
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Solution
Using the product rule, f'(x) = 2x * sin(x) + x^2 * cos(x).
Correct Answer:
A
— 2x * sin(x) + x^2 * cos(x)
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Q. What is the derivative of f(x) = x^3 * e^x?
A.
3x^2 * e^x + x^3 * e^x
B.
x^3 * e^x
C.
3x^2 * e^x
D.
x^3 * e^(x+1)
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Solution
Using the product rule, f'(x) = 3x^2 * e^x + x^3 * e^x.
Correct Answer:
A
— 3x^2 * e^x + x^3 * e^x
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Q. What is the derivative of f(x) = x^3 * ln(x)? (2023)
A.
3x^2 * ln(x) + x^2
B.
3x^2 * ln(x) + x^3/x
C.
3x^2 * ln(x) + 3x^2
D.
3x^2 * ln(x) + 1
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Solution
Using the product rule, f'(x) = 3x^2 * ln(x) + x^2.
Correct Answer:
A
— 3x^2 * ln(x) + x^2
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Q. What is the derivative of f(x) = x^3 - 4x + 7? (2021)
A.
3x^2 - 4
B.
3x^2 + 4
C.
x^2 - 4
D.
3x^2 - 7
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Solution
Using the power rule, f'(x) = 3x^2 - 4.
Correct Answer:
A
— 3x^2 - 4
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Q. What is the derivative of f(x) = x^3 - 6x^2 + 9x?
A.
3x^2 - 12x + 9
B.
3x^2 - 6x + 9
C.
6x - 12
D.
3x^2 - 9
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Solution
The derivative f'(x) = 3x^2 - 12x + 9.
Correct Answer:
A
— 3x^2 - 12x + 9
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Q. What is the derivative of f(x) = x^4 - 6x^2 + 9? (2022)
A.
4x^3 - 12x
B.
4x^3 + 12x
C.
2x^3 - 6x
D.
2x^3 + 6x
Show solution
Solution
Using the power rule, f'(x) = 4x^3 - 12x.
Correct Answer:
A
— 4x^3 - 12x
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Q. What is the derivative of the function f(x) = 3x^2 + 5x - 7? (2021)
A.
3x + 5
B.
6x + 5
C.
6x - 5
D.
3x^2 + 5
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Solution
The derivative f'(x) = d/dx(3x^2 + 5x - 7) = 6x + 5.
Correct Answer:
B
— 6x + 5
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Q. What is the determinant of a 1x1 matrix [[5]]? (2021)
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Solution
The determinant of a 1x1 matrix is simply the value of the single element. Therefore, the determinant of [[5]] is 5.
Correct Answer:
B
— 5
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Q. What is the determinant of a 2x2 matrix A = [[a, b], [c, d]]? (2021)
A.
ad - bc
B.
ab + cd
C.
ac + bd
D.
ad + bc
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Solution
The determinant of a 2x2 matrix is calculated as ad - bc.
Correct Answer:
A
— ad - bc
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Q. What is the determinant of a 2x2 matrix [[a, b], [c, d]]? (2020)
A.
ad - bc
B.
ab + cd
C.
ac - bd
D.
bc - ad
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Solution
The determinant of a 2x2 matrix is calculated as ad - bc.
Correct Answer:
A
— ad - bc
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Q. What is the determinant of the matrix E = [[1, 2, 3], [4, 5, 6], [7, 8, 9]]?
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Solution
The determinant of E is 0 because the rows are linearly dependent.
Correct Answer:
A
— 0
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Q. What is the determinant of the matrix H = [[1, 1, 1], [1, 2, 3], [1, 3, 6]]?
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Solution
The determinant can be calculated using the formula for 3x3 matrices. Here, the first column is the same, leading to a determinant of 0.
Correct Answer:
A
— 0
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Q. What is the determinant of the matrix \( E = \begin{pmatrix} 1 & 1 & 1 \\ 1 & 2 & 3 \\ 1 & 3 & 6 \end{pmatrix} \)? (2023)
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Solution
The determinant is 0 because the first column is a linear combination of the other columns.
Correct Answer:
A
— 0
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Q. What is the determinant of the matrix \( J = \begin{pmatrix} 5 & 6 \\ 7 & 8 \end{pmatrix} \)? (2021)
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Solution
Det(J) = (5*8) - (6*7) = 40 - 42 = -2.
Correct Answer:
A
— -2
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Q. What is the direction of the magnetic field around a current-carrying conductor? (2019)
A.
From North to South
B.
From South to North
C.
Clockwise
D.
Counterclockwise
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Solution
The direction of the magnetic field around a current-carrying conductor is given by the right-hand rule, which indicates a counterclockwise direction when viewed from the positive current side.
Correct Answer:
D
— Counterclockwise
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Q. What is the directrix of the parabola defined by the equation y^2 = 20x?
A.
x = -5
B.
x = 5
C.
y = 5
D.
y = -5
Show solution
Solution
For the equation y^2 = 4px, p = 5. The directrix is given by x = -p, which is x = -5.
Correct Answer:
A
— x = -5
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Q. What is the distance between the points (0, 0) and (3, 4)?
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Solution
Using the distance formula: d = √[(3 - 0)² + (4 - 0)²] = √[9 + 16] = √25 = 5.
Correct Answer:
A
— 5
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Q. What is the distance between the points (0, 0) and (8, 6)?
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Solution
Using the distance formula: d = √((8 - 0)² + (6 - 0)²) = √(64 + 36) = √100 = 10.
Correct Answer:
A
— 10
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Q. What is the distance between the points (0, 0) and (x, y) where x = 3 and y = 4? (2022)
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Solution
Using the distance formula: d = √[(3 - 0)² + (4 - 0)²] = √[9 + 16] = √25 = 5.
Correct Answer:
A
— 5
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Q. What is the distance between the points (2, 3) and (6, 7)?
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Solution
Using the distance formula: d = √[(6 - 2)² + (7 - 3)²] = √[16 + 16] = √32 = 4√2 ≈ 5.66.
Correct Answer:
A
— 5
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Q. What is the distance between the points (3, 2) and (3, -2)?
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Solution
Using the distance formula: d = √[(3 - 3)² + (-2 - 2)²] = √[0 + 16] = √16 = 4.
Correct Answer:
A
— 4
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Q. What is the distance between the points (3, 7) and (3, 1)?
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Solution
Using the distance formula: d = √[(3 - 3)² + (1 - 7)²] = √[0 + 36] = √36 = 6.
Correct Answer:
A
— 6
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Q. What is the distance between the points (5, 5) and (1, 1)?
Show solution
Solution
Using the distance formula: d = √[(1 - 5)² + (1 - 5)²] = √[16 + 16] = √32 = 4√2.
Correct Answer:
A
— 4√2
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Q. What is the distance between the points (6, 8) and (6, 2)?
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Solution
Using the distance formula: d = √[(6 - 6)² + (2 - 8)²] = √[0 + 36] = √36 = 6.
Correct Answer:
A
— 6
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Q. What is the effect called when sound waves spread out after passing through a narrow opening? (2019)
A.
Reflection
B.
Refraction
C.
Diffraction
D.
Interference
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Solution
The spreading out of sound waves after passing through a narrow opening is known as diffraction.
Correct Answer:
C
— Diffraction
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Q. What is the effect of adding a base to a solution of a weak acid?
A.
Increase in pH
B.
Decrease in pH
C.
No change in pH
D.
Increase in temperature
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Solution
Adding a base to a weak acid will neutralize some of the acid, increasing the pH.
Correct Answer:
A
— Increase in pH
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Q. What is the effect of adding a base to a solution of hydrochloric acid?
A.
Increase in pH
B.
Decrease in pH
C.
No effect
D.
Formation of salt only
Show solution
Solution
Adding a base to hydrochloric acid will neutralize it, resulting in an increase in pH.
Correct Answer:
A
— Increase in pH
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Q. What is the effect of adding a base to an acidic solution?
A.
Increase in pH
B.
Decrease in pH
C.
No effect
D.
Formation of salt only
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Solution
Adding a base to an acidic solution increases the pH, making it less acidic.
Correct Answer:
A
— Increase in pH
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Q. What is the effect of adding a strong acid to a solution of a weak base?
A.
Increase in pH
B.
Decrease in pH
C.
No effect
D.
Increase in conductivity
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Solution
Adding a strong acid to a weak base will decrease the pH of the solution.
Correct Answer:
B
— Decrease in pH
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Q. What is the effect of deforestation on local climate?
A.
Increased rainfall
B.
Decreased temperature
C.
Increased temperature
D.
No effect
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Solution
Deforestation typically leads to increased temperatures in the local climate due to reduced transpiration and increased solar radiation absorption.
Correct Answer:
C
— Increased temperature
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