Q. What is the process of heat transfer through direct contact called? (2022)
A.
Convection
B.
Conduction
C.
Radiation
D.
Insulation
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Solution
The process of heat transfer through direct contact is called conduction.
Correct Answer: B — Conduction
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Q. What is the process of heat transfer through fluid motion called? (2022)
A.
Conduction
B.
Convection
C.
Radiation
D.
Insulation
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Solution
The process of heat transfer through fluid motion is called convection.
Correct Answer: B — Convection
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Q. What is the process of heat transfer through the movement of fluids called? (2022)
A.
Conduction
B.
Convection
C.
Radiation
D.
Insulation
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Solution
The process of heat transfer through the movement of fluids is called convection.
Correct Answer: B — Convection
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Q. What is the product of the oxidation of an aldehyde? (2023)
A.
Alcohol
B.
Carboxylic acid
C.
Ketone
D.
Alkane
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Solution
The oxidation of an aldehyde results in the formation of a carboxylic acid.
Correct Answer: B — Carboxylic acid
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Q. What is the product of the reaction between 1-bromobutane and sodium ethoxide in ethanol? (2020)
A.
Butane
B.
Ethyl butanoate
C.
Butyl ethyl ether
D.
1-Butanol
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Solution
The reaction of 1-bromobutane with sodium ethoxide leads to the formation of butyl ethyl ether through an SN2 mechanism.
Correct Answer: C — Butyl ethyl ether
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Q. What is the product of the reaction between ammonia and an alkyl halide? (2023)
A.
Amine
B.
Alcohol
C.
Ether
D.
Aldehyde
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Solution
The product of the reaction between ammonia and an alkyl halide is an amine.
Correct Answer: A — Amine
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Q. What is the product of the reduction of Cr2O7²⁻ in acidic medium? (2019)
A.
CrO4²⁻
B.
Cr³⁺
C.
Cr²O3
D.
CrO2
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Solution
In acidic medium, Cr2O7²⁻ is reduced to Cr³⁺.
Correct Answer: B — Cr³⁺
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Q. What is the product of the reduction of permanganate ion (MnO4-) in acidic medium? (2019)
A.
MnO2
B.
Mn2O3
C.
Mn2+
D.
MnO4
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Solution
In acidic medium, the permanganate ion (MnO4-) is reduced to manganese ion (Mn2+).
Correct Answer: C — Mn2+
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Q. What is the purpose of using a DNA ligase in genetic engineering? (2023)
A.
To cut DNA
B.
To amplify DNA
C.
To join DNA fragments together
D.
To degrade RNA
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Solution
DNA ligase is an enzyme that joins DNA fragments together, which is essential for creating recombinant DNA molecules in genetic engineering.
Correct Answer: C — To join DNA fragments together
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Q. What is the purpose of using a promoter in a recombinant DNA construct? (2021)
A.
To cut the DNA
B.
To initiate transcription of the gene
C.
To stabilize the DNA
D.
To replicate the DNA
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Solution
A promoter is a DNA sequence that initiates transcription of a gene, allowing for the expression of the inserted gene in the host organism.
Correct Answer: B — To initiate transcription of the gene
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Q. What is the purpose of using a promoter in a recombinant DNA molecule? (2021)
A.
To initiate DNA replication
B.
To enhance the stability of the DNA
C.
To drive the expression of the inserted gene
D.
To facilitate DNA repair
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Solution
A promoter is a DNA sequence that initiates transcription of a particular gene, driving the expression of the inserted gene in a recombinant DNA molecule.
Correct Answer: C — To drive the expression of the inserted gene
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Q. What is the purpose of using a selectable marker in a cloning vector? (2021)
A.
To enhance the stability of the vector
B.
To allow for the identification of successfully transformed cells
C.
To increase the replication rate of the vector
D.
To facilitate the insertion of foreign DNA
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Solution
Selectable markers are genes that confer resistance to antibiotics or other substances, allowing for the identification of cells that have successfully taken up the vector.
Correct Answer: B — To allow for the identification of successfully transformed cells
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Q. What is the purpose of using a selectable marker in genetic engineering? (2023)
A.
To enhance gene expression
B.
To identify successfully transformed cells
C.
To increase DNA stability
D.
To promote cell division
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Solution
Selectable markers are genes that confer resistance to antibiotics or other substances, allowing researchers to identify cells that have successfully taken up the recombinant DNA.
Correct Answer: B — To identify successfully transformed cells
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Q. What is the purpose of using a vernier caliper? (2019)
A.
To measure mass
B.
To measure temperature
C.
To measure length with high precision
D.
To measure volume
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Solution
A vernier caliper is used to measure lengths with high precision.
Correct Answer: C — To measure length with high precision
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Q. What is the purpose of using biopesticides in agriculture? (2023)
A.
To increase soil fertility
B.
To control pests using natural organisms
C.
To enhance crop growth
D.
To improve water retention
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Solution
Biopesticides are used to control pests through natural organisms, making option 'To control pests using natural organisms' the correct answer.
Correct Answer: B — To control pests using natural organisms
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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 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 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
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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
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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 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
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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
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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
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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
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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
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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 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
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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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Q. What is the relationship between pressure and depth in a fluid at rest? (2019)
A.
Pressure increases with depth
B.
Pressure decreases with depth
C.
Pressure remains constant
D.
Pressure varies randomly
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Solution
In a fluid at rest, pressure increases with depth due to the weight of the fluid above.
Correct Answer: A — Pressure increases with depth
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Q. What is the relationship between RMS and average value of an AC waveform? (2023)
A.
RMS = Average
B.
RMS = Average × √2
C.
RMS = Average / √2
D.
RMS = Average × 2
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Solution
For a sinusoidal AC waveform, the RMS value is related to the average value by RMS = Average / √2.
Correct Answer: C — RMS = Average / √2
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