Q. What is the purpose of using CRISPR technology in biotechnology? (2023)
A.
To clone organisms
B.
To edit genes
C.
To produce vaccines
D.
To sequence DNA
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Solution
CRISPR technology is primarily used for gene editing, allowing precise modifications to DNA.
Correct Answer:
B
— To edit genes
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Q. What is the purpose of using DNA fingerprinting in forensic science? (2023)
A.
To identify individuals
B.
To clone organisms
C.
To produce vaccines
D.
To enhance crop yield
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Solution
DNA fingerprinting is used to identify individuals based on their unique DNA profiles, making it crucial in forensic science.
Correct Answer:
A
— To identify individuals
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Q. What is the purpose of using markers in genetically modified crops? (2021)
A.
To enhance flavor
B.
To track genetic changes
C.
To increase size
D.
To improve color
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Solution
Markers are used to track genetic changes and ensure the desired traits are present in genetically modified crops.
Correct Answer:
B
— To track genetic changes
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Q. What is the purpose of using plasmids in genetic engineering? (2023)
A.
To increase crop yield
B.
To serve as vectors for gene transfer
C.
To produce antibiotics
D.
To enhance photosynthesis
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Solution
Plasmids are used as vectors to transfer genes into host cells in genetic engineering.
Correct Answer:
B
— To serve as vectors for gene transfer
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Q. What is the purpose of using restriction enzymes in genetic engineering? (2023)
A.
To cut DNA at specific sites
B.
To amplify DNA
C.
To sequence DNA
D.
To repair DNA
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Solution
Restriction enzymes are used to cut DNA at specific sequences, which is essential for cloning and genetic engineering.
Correct Answer:
A
— To cut DNA at specific sites
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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
Show solution
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
Show solution
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 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]
Show solution
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 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 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]
Show solution
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]
Show solution
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]
Show solution
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 reactance of an inductor at a frequency of 50 Hz if the inductance is 0.1 H? (2023)
A.
31.4 Ω
B.
6.28 Ω
C.
157 Ω
D.
12.56 Ω
Show solution
Solution
Reactance (X_L) = 2πfL = 2π(50)(0.1) = 31.4 Ω.
Correct Answer:
A
— 31.4 Ω
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Q. What is the reactance of an inductor in an AC circuit with frequency f? (2023)
A.
2πfL
B.
1/(2πfL)
C.
L/(2πf)
D.
0
Show solution
Solution
The reactance of an inductor in an AC circuit is given by the formula X_L = 2πfL.
Correct Answer:
A
— 2πfL
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Q. What is the real part of the complex number 4 + 5i? (2023)
Show solution
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
Show solution
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 charge (Q), capacitance (C), and voltage (V) in a capacitor? (2023)
A.
Q = CV
B.
Q = C/V
C.
Q = V/C
D.
Q = C + V
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Solution
The relationship is given by Q = CV, where Q is the charge, C is the capacitance, and V is the voltage across the capacitor.
Correct Answer:
A
— Q = CV
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Q. What is the relationship between current (I), charge (Q), and time (t)? (2022)
A.
I = Q × t
B.
I = Q / t
C.
I = t / Q
D.
I = Q + t
Show solution
Solution
The relationship is given by I = Q / t, where I is current, Q is charge, and t is time.
Correct Answer:
B
— I = Q / t
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Q. What is the relationship between current (I), voltage (V), and resistance (R) in a circuit? (2021)
A.
I = V/R
B.
I = R/V
C.
I = V*R
D.
I = V + R
Show solution
Solution
The relationship is given by Ohm's law: I = V/R.
Correct Answer:
A
— I = V/R
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Q. What is the relationship between electric field (E) and electric potential (V) in a uniform field? (2022)
A.
E = V/d
B.
E = d/V
C.
E = V^2
D.
E = V/d^2
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Solution
In a uniform electric field, the electric field E is related to the potential difference V and the distance d by the equation E = V/d.
Correct Answer:
A
— E = V/d
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Q. What is the relationship between frequency (f) and period (T) of a wave? (2023)
A.
f = T
B.
f = 1/T
C.
f = T^2
D.
f = 2πT
Show solution
Solution
The frequency (f) is the reciprocal of the period (T), given by the formula f = 1/T.
Correct Answer:
B
— f = 1/T
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Q. What is the relationship between frequency and period of a wave? (2020)
A.
Frequency = Period × Speed
B.
Frequency = 1/Period
C.
Frequency = Speed × Wavelength
D.
Frequency = Wavelength/Speed
Show solution
Solution
The frequency (f) of a wave is the reciprocal of the period (T), given by the formula f = 1/T.
Correct Answer:
B
— Frequency = 1/Period
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Q. What is the relationship between frequency and the time period of an AC signal? (2023)
A.
Frequency = Time period × 2
B.
Frequency = 1 / Time period
C.
Frequency = Time period / 2
D.
Frequency = Time period × π
Show solution
Solution
The frequency (f) is the reciprocal of the time period (T), given by f = 1 / T.
Correct Answer:
B
— Frequency = 1 / Time period
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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
Show solution
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 magnetic field strength and distance from a long straight conductor? (2023)
A.
Increases with distance
B.
Decreases with distance
C.
Remains constant
D.
Increases then decreases
Show solution
Solution
The magnetic field strength around a long straight conductor decreases with distance from the conductor, following the inverse relationship.
Correct Answer:
B
— Decreases with distance
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