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 linking words in a text? (2023)
A.
To confuse the reader
B.
To enhance the visual appeal
C.
To connect ideas smoothly
D.
To increase word count
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Solution
Linking words are used to connect ideas smoothly, improving the coherence of the text.
Correct Answer:
C
— To connect ideas smoothly
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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 purpose of virtual memory?
A.
To increase the physical memory size
B.
To allow multiple processes to run simultaneously
C.
To provide an abstraction of the main memory
D.
To manage disk space
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Solution
Virtual memory provides an abstraction of the main memory, allowing processes to use more memory than is physically available.
Correct Answer:
C
— To provide an abstraction of the main memory
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Q. What is the quorum required for a Lok Sabha session? (2023)
A.
One-fourth of the total strength
B.
One-third of the total strength
C.
Half of the total strength
D.
One-fifth of the total strength
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Solution
The quorum required for a Lok Sabha session is one-fourth of the total strength.
Correct Answer:
A
— One-fourth of the total strength
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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 radius of the circle given by the equation (x - 1)² + (y + 4)² = 16?
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Solution
The radius is the square root of 16, which is 4.
Correct Answer:
A
— 4
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Q. What is the range of human hearing in Hertz?
A.
20 Hz to 20 kHz
B.
20 kHz to 20 MHz
C.
1 Hz to 100 kHz
D.
10 Hz to 10 kHz
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Solution
The typical range of human hearing is from 20 Hz to 20 kHz.
Correct Answer:
A
— 20 Hz to 20 kHz
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Q. What is the range of human hearing in terms of frequency?
A.
20 Hz to 20 kHz
B.
20 kHz to 20 MHz
C.
1 Hz to 100 kHz
D.
100 Hz to 10 kHz
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Solution
The typical range of human hearing is from 20 Hz to 20 kHz.
Correct Answer:
A
— 20 Hz to 20 kHz
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Q. What is the range of sin^(-1)(x)?
A.
[-π/2, π/2]
B.
[-1, 1]
C.
[0, π]
D.
[-π, π]
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Solution
The range of sin^(-1)(x) is [-π/2, π/2].
Correct Answer:
A
— [-π/2, π/2]
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Q. What is the range of the data set {15, 22, 18, 30, 25}?
Show solution
Solution
Range = Maximum value - Minimum value = 30 - 15 = 15.
Correct Answer:
A
— 15
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Q. What is the range of the data set {15, 22, 30, 18, 25}?
Show solution
Solution
Range = Maximum - Minimum = 30 - 15 = 15.
Correct Answer:
A
— 15
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Q. What is the range of the data set {4, 8, 6, 5, 3}?
Show solution
Solution
Range = Maximum value - Minimum value = 8 - 3 = 5.
Correct Answer:
A
— 5
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Q. What is the range of the data set {5, 8, 12, 15, 20}?
Show solution
Solution
Range = Maximum value - Minimum value = 20 - 5 = 15.
Correct Answer:
A
— 15
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Q. What is the range of the data set: 12, 15, 22, 30, 5?
Show solution
Solution
Range = max - min = 30 - 5 = 25.
Correct Answer:
A
— 25
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Q. What is the range of the data set: 5, 10, 15, 20, 25?
Show solution
Solution
Range = Maximum - Minimum = 25 - 5 = 20.
Correct Answer:
A
— 15
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