Undergraduate
Q. What is the value of the coefficient of x^4 in the expansion of (x - 2)^6? (2023)
-
A.
-15
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B.
-60
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C.
-90
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D.
-120
Solution
The coefficient of x^4 is C(6,4) * (-2)^2 = 15 * 4 = -60.
Correct Answer: B — -60
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Q. What is the value of the coefficient of x^5 in the expansion of (x + 2)^7?
Solution
The coefficient of x^5 is given by 7C5 * (2)^2 = 21 * 4 = 84.
Correct Answer: C — 56
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Q. What is the value of the determinant of the matrix B = [[2, 3], [5, 7]]? (2020)
Solution
Determinant of B = (2*7) - (3*5) = 14 - 15 = -1.
Correct Answer: C — 11
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Q. What is the value of the determinant of the matrix B = [[5, 1], [2, 3]]? (2022)
Solution
Determinant of B = (5*3) - (1*2) = 15 - 2 = 13.
Correct Answer: A — 10
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Q. What is the value of the discriminant for the equation x² - 2x + 1 = 0? (2022)
Solution
The discriminant is b² - 4ac = (-2)² - 4*1*1 = 0.
Correct Answer: A — 0
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Q. What is the value of the gravitational constant (G) in SI units? (2023)
-
A.
6.67 x 10^-11 N m²/kg²
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B.
9.81 m/s²
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C.
3.00 x 10^8 m/s
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D.
1.60 x 10^-19 C
Solution
The gravitational constant (G) is 6.67 x 10^-11 N m²/kg².
Correct Answer: A — 6.67 x 10^-11 N m²/kg²
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Q. What is the value of the term containing x^5 in the expansion of (x + 1/2)^8? (2020)
Solution
The term containing x^5 is C(8,5)(1/2)^3 = 56 * 1/8 = 7.
Correct Answer: B — 56
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Q. What is the value of the term containing x^5 in the expansion of (x + 2)^8? (2020)
-
A.
112
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B.
128
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C.
256
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D.
64
Solution
The term containing x^5 is C(8,5)(2)^3 = 56 * 8 = 448.
Correct Answer: B — 128
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Q. What is the value of x where f(x) = x^3 - 3x has a local maximum? (2022)
Solution
f'(x) = 3x^2 - 3. Setting f'(x) = 0 gives x = ±1. f(1) = -2.
Correct Answer: C — 1
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Q. What is the value of \( |D| \) for the matrix \( D = \begin{pmatrix} 0 & 1 \\ 1 & 0 \end{pmatrix} \)? (2023)
Solution
The determinant is \( 0*0 - 1*1 = 0 - 1 = -1 \).
Correct Answer: A — 1
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Q. What is the van 't Hoff factor (i) for a non-electrolyte solute? (2023)
Solution
The van 't Hoff factor (i) for a non-electrolyte solute is 1, as it does not dissociate into ions.
Correct Answer: A — 1
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Q. What is the van 't Hoff factor (i) for a solution of glucose (C6H12O6)? (2023)
Solution
Glucose does not dissociate in solution, so the van 't Hoff factor (i) = 1.
Correct Answer: A — 1
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Q. What is the van 't Hoff factor (i) for a strong electrolyte like Na2SO4 in solution? (2023)
Solution
Na2SO4 dissociates into 3 ions (2 Na⁺ and 1 SO4²⁻), so i = 3.
Correct Answer: C — 3
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Q. What is the vapor pressure of a solution containing 1 mole of solute in 10 moles of solvent, assuming ideal behavior? (2019)
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A.
0.1 P0
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B.
0.9 P0
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C.
0.5 P0
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D.
0.2 P0
Solution
Using Raoult's law, the vapor pressure of the solution = (moles of solvent / total moles) * P0 = (10 / 11) * P0 ≈ 0.909 P0.
Correct Answer: B — 0.9 P0
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Q. What is the vapor pressure of a solution containing 1 mole of solute in 9 moles of solvent, assuming ideal behavior? (2019)
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A.
0.1 P0
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B.
0.9 P0
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C.
0.5 P0
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D.
0.2 P0
Solution
Using Raoult's law, the vapor pressure of the solution = (moles of solvent / total moles) * P0 = (9 / 10) * P0 = 0.9 P0.
Correct Answer: B — 0.9 P0
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Q. What is the vapor pressure of a solution containing 2 moles of solute and 4 moles of solvent, assuming ideal behavior? (2022)
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A.
0.33 P0
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B.
0.50 P0
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C.
0.67 P0
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D.
0.75 P0
Solution
Vapor pressure = (moles of solvent / total moles) * P0 = (4 / (2 + 4)) * P0 = (4/6) * P0 = 0.67 P0.
Correct Answer: C — 0.67 P0
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Q. What is the vertex of the parabola represented by the equation y = x² - 4x + 3? (2022)
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A.
(2, -1)
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B.
(2, 1)
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C.
(1, 2)
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D.
(3, 0)
Solution
The vertex can be found using the formula x = -b/2a. Here, x = 2, and substituting back gives y = -1.
Correct Answer: A — (2, -1)
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Q. What is the vertex of the parabola represented by the equation y = x² - 6x + 8? (2023)
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A.
(3, -1)
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B.
(3, -5)
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C.
(2, -4)
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D.
(2, -2)
Solution
The vertex can be found using the formula x = -b/2a = 6/2 = 3. Substituting x = 3 into the equation gives y = -1.
Correct Answer: A — (3, -1)
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Q. What is the voltage across a 10Ω resistor carrying a current of 2A? (2022)
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A.
5V
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B.
10V
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C.
15V
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D.
20V
Solution
Using Ohm's law, V = I * R = 2A * 10Ω = 20V.
Correct Answer: B — 10V
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Q. What is the voltage across a 10Ω resistor carrying a current of 3A? (2022)
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A.
30V
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B.
20V
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C.
10V
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D.
15V
Solution
Using Ohm's law, V = IR = 3A * 10Ω = 30V.
Correct Answer: A — 30V
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Q. What is the voltage across a 12Ω resistor carrying a current of 1.5A? (2023)
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A.
18V
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B.
12V
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C.
6V
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D.
24V
Solution
Using Ohm's law, V = IR = 1.5A * 12Ω = 18V.
Correct Answer: A — 18V
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Q. What is the voltage across a 12Ω resistor carrying a current of 3A? (2023)
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A.
36V
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B.
24V
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C.
12V
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D.
18V
Solution
Using Ohm's law, V = IR = 3A * 12Ω = 36V.
Correct Answer: A — 36V
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Q. What is the voltage across a 5Ω resistor carrying a current of 3A? (2023)
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A.
15V
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B.
10V
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C.
5V
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D.
20V
Solution
Using Ohm's law, V = IR = 3A * 5Ω = 15V.
Correct Answer: A — 15V
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Q. What is the voltage across a 5Ω resistor if a current of 3A flows through it? (2020)
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A.
15V
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B.
10V
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C.
5V
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D.
20V
Solution
Using Ohm's law, V = IR = 3A * 5Ω = 15V.
Correct Answer: A — 15V
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Q. What is the voltage drop across a 3Ω resistor carrying a current of 4A? (2019)
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A.
6V
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B.
8V
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C.
12V
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D.
15V
Solution
Using Ohm's law, V = I * R = 4A * 3Ω = 12V.
Correct Answer: C — 12V
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Q. What is the volume of 0.2 M NaOH required to neutralize 0.1 M HCl in 250 mL? (2020)
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A.
125 mL
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B.
250 mL
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C.
500 mL
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D.
100 mL
Solution
Using the formula M1V1 = M2V2, (0.1 M)(0.25 L) = (0.2 M)(V2). V2 = 0.125 L = 125 mL.
Correct Answer: A — 125 mL
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Q. What is the volume of 1 M HCl solution needed to obtain 0.5 moles of HCl? (2022)
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A.
0.5 L
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B.
1 L
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C.
2 L
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D.
0.25 L
Solution
Volume = moles / molarity = 0.5 moles / 1 M = 0.5 L.
Correct Answer: A — 0.5 L
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Q. What is the volume of 1 mole of an ideal gas at STP? (2019) 2019
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A.
22.4 L
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B.
24 L
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C.
1 L
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D.
10 L
Solution
At STP, 1 mole of an ideal gas occupies 22.4 liters.
Correct Answer: A — 22.4 L
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Q. What is the volume of a 2 M NaOH solution needed to obtain 4 moles of NaOH? (2021) 2021
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A.
2 L
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B.
1 L
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C.
0.5 L
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D.
4 L
Solution
Volume (L) = moles / molarity = 4 moles / 2 M = 2 L.
Correct Answer: A — 2 L
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Q. What is the volume of a cube with side length 3 units? (2023)
Solution
Volume = side³ = 3³ = 27 cubic units.
Correct Answer: B — 27
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