Q. What is the product of the roots of the equation x^2 - 5x + 6 = 0? (2014) 2014
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Solution
The product of the roots is c/a = 6/1 = 6.
Correct Answer: A — 6
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Q. What is the product of the roots of the equation x² + 5x + 6 = 0? (2022)
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Solution
The product of the roots is given by c/a = 6/1 = 6.
Correct Answer: A — 6
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Q. What is the product of the roots of the equation x² - 10x + 24 = 0? (2021)
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Solution
The product of the roots is given by c/a = 24/1 = 24.
Correct Answer: A — 24
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Q. What is the product of the roots of the equation x² - 8x + 15 = 0? (2022)
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Solution
The product of the roots is given by c/a = 15/1 = 15.
Correct Answer: A — 15
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Q. What is the projection of vector A = 3i + 4j onto vector B = i + j? (2020)
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Solution
proj_B(A) = (A · B / |B|^2)B = ((3*1 + 4*1) / (1^2 + 1^2))(i + j) = (7/2)(i + j) = 3.5.
Correct Answer: C — 5
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Q. What is the radius of a circle if its circumference is 62.8 cm? (2022)
A.
10 cm
B.
15 cm
C.
20 cm
D.
5 cm
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Solution
Circumference = 2πr; 62.8 = 2πr; r = 10 cm.
Correct Answer: A — 10 cm
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Q. What is the radius of a circle if the area is 154 square units? (2023)
A.
7 units
B.
14 units
C.
11 units
D.
10 units
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Solution
Area = πr²; 154 = 22/7 * r²; r² = 154 * 7/22 = 49; r = 7 units.
Correct Answer: A — 7 units
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Q. What is the radius of a circle if the circumference is 31.4 m? (2020)
A.
5 m
B.
10 m
C.
15 m
D.
20 m
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Solution
Circumference = 2πr; 31.4 = 2πr; r = 31.4/(2π) ≈ 5 m.
Correct Answer: A — 5 m
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Q. What is the radius of a circle if the circumference is 62.8 cm? (2016)
A.
10 cm
B.
15 cm
C.
20 cm
D.
25 cm
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Solution
Circumference = 2πr; 62.8 = 2πr; r = 62.8/(2π) ≈ 10 cm.
Correct Answer: A — 10 cm
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Q. What is the radius of a circle if the diameter is 14 cm? (2021)
A.
7 cm
B.
14 cm
C.
21 cm
D.
28 cm
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Solution
Radius is half of the diameter. Therefore, radius = 14 cm / 2 = 7 cm.
Correct Answer: A — 7 cm
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Q. What is the rate constant of a first-order reaction if the half-life is 10 minutes? (2021)
A.
0.0693 min⁻¹
B.
0.1 min⁻¹
C.
0.693 min⁻¹
D.
0.5 min⁻¹
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Solution
For a first-order reaction, k = 0.693 / t₁/₂. Here, t₁/₂ = 10 min, so k = 0.693 / 10 = 0.0693 min⁻¹.
Correct Answer: A — 0.0693 min⁻¹
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Q. What is the rate law expression for a reaction that is first order with respect to reactant A? (2022)
A.
Rate = k[A]
B.
Rate = k[A]^2
C.
Rate = k[A]^0
D.
Rate = k[A]^[1/2]
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Solution
For a first order reaction, the rate law is directly proportional to the concentration of the reactant, hence Rate = k[A].
Correct Answer: A — Rate = k[A]
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Q. What is the rate law expression for a reaction that is first order with respect to A and second order with respect to B? (2022)
A.
Rate = k[A][B]^2
B.
Rate = k[A]^2[B]
C.
Rate = k[A]^2[B]^2
D.
Rate = k[A][B]
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Solution
The rate law for a reaction is determined by the order with respect to each reactant. For a first order with respect to A and second order with respect to B, the rate law is Rate = k[A][B]^2.
Correct Answer: A — Rate = k[A][B]^2
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Q. What is the rate law expression for a reaction that is second order with respect to reactant A? (2023)
A.
Rate = k[A]
B.
Rate = k[A]^2
C.
Rate = k[A]^2[B]
D.
Rate = k[A][B]
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Solution
For a second order reaction with respect to A, the rate law is expressed as Rate = k[A]^2.
Correct Answer: B — Rate = k[A]^2
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Q. What is the rate law for a reaction that is first order with respect to A and second order with respect to B? (2022) 2022
A.
Rate = k[A][B]^2
B.
Rate = k[A]^2[B]
C.
Rate = k[A]^2[B]^2
D.
Rate = k[A][B]
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Solution
The rate law is determined by the order of the reaction with respect to each reactant. For first order in A and second order in B, the rate law is Rate = k[A][B]^2.
Correct Answer: A — Rate = k[A][B]^2
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Q. What is the rate law for a reaction that is second order with respect to reactant A? (2023)
A.
Rate = k[A]
B.
Rate = k[A]^2
C.
Rate = k[A]^2[B]
D.
Rate = k[A][B]
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Solution
For a second order reaction with respect to A, the rate law is expressed as Rate = k[A]^2.
Correct Answer: B — Rate = k[A]^2
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Q. What is the real part of the complex number 4 + 5i? (2023)
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Solution
The real part of the complex number 4 + 5i is 4.
Correct Answer: A — 4
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Q. What is the real part of the complex number 7 - 4i? (2023)
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Solution
The real part of the complex number 7 - 4i is 7.
Correct Answer: A — 7
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Q. What is the reduction potential of the half-reaction 2H⁺ + 2e⁻ → H₂?
A.
0.00 V
B.
0.34 V
C.
0.76 V
D.
1.23 V
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Solution
The standard reduction potential for 2H⁺ + 2e⁻ → H₂ is 0.00 V.
Correct Answer: D — 1.23 V
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Q. What is the relationship between Gibbs free energy (ΔG) and cell potential (E) in electrochemistry?
A.
ΔG = -nFE
B.
ΔG = nFE
C.
ΔG = -E/nF
D.
ΔG = E/nF
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Solution
The relationship is ΔG = -nFE, where n is the number of moles of electrons transferred.
Correct Answer: A — ΔG = -nFE
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Q. What is the relationship between the frequency and the period of a wave? (2021)
A.
Frequency is the square of the period
B.
Period is the reciprocal of frequency
C.
Frequency and period are unrelated
D.
Period is the square root of frequency
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Solution
The period T is the reciprocal of frequency f, given by T = 1/f.
Correct Answer: B — Period is the reciprocal of frequency
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Q. What is the relationship between the rate of reaction and temperature according to the Arrhenius equation? (2022)
A.
Inversely proportional
B.
Directly proportional
C.
Exponential
D.
Linear
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Solution
According to the Arrhenius equation, the rate of reaction increases exponentially with temperature.
Correct Answer: C — Exponential
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Q. What is the relationship between the units of energy (Joule) and force (Newton)? (2021)
A.
1 J = 1 N·m
B.
1 J = 1 N/m
C.
1 J = 1 m/N
D.
1 J = 1 N^2
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Solution
1 Joule is defined as the work done when a force of one Newton moves an object one meter, hence 1 J = 1 N·m.
Correct Answer: A — 1 J = 1 N·m
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Q. What is the relationship between the wavelength of light and the angle of diffraction in a grating? (2023)
A.
Directly proportional
B.
Inversely proportional
C.
No relationship
D.
Exponential relationship
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Solution
The angle of diffraction is directly proportional to the wavelength of light used in a diffraction grating, as described by the grating equation.
Correct Answer: A — Directly proportional
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Q. What is the relationship between the wavelength of light and the angle of diffraction in a single-slit experiment? (2023)
A.
Directly proportional
B.
Inversely proportional
C.
No relationship
D.
Exponential relationship
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Solution
The angle of diffraction is inversely proportional to the wavelength; as the wavelength increases, the angle of diffraction decreases.
Correct Answer: B — Inversely proportional
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Q. What is the resistance of a circuit if a current of 5A flows through it when a voltage of 25V is applied? (2022)
A.
5Ω
B.
10Ω
C.
15Ω
D.
20Ω
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Solution
Using Ohm's law (R = V/I), R = 25V / 5A = 5Ω.
Correct Answer: B — 10Ω
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Q. What is the result of (15 + 5) × 2? (2020)
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Solution
(15 + 5) = 20, then 20 × 2 = 40.
Correct Answer: B — 30
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Q. What is the result of (15 + 5) × 2? (2023) 2023
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Solution
(15 + 5) = 20, so 20 × 2 = 40.
Correct Answer: A — 30
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Q. What is the result of (15 ÷ 3) × 4? (2020)
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Solution
15 ÷ 3 = 5, then 5 × 4 = 20.
Correct Answer: A — 20
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Q. What is the shape of a molecule with a tetrahedral geometry? (2023)
A.
Linear
B.
Trigonal planar
C.
Tetrahedral
D.
Octahedral
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Solution
A tetrahedral geometry has a central atom bonded to four other atoms, forming a shape like a pyramid with a triangular base.
Correct Answer: C — Tetrahedral
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