Q. What is the ionization energy of hydrogen in eV? (2019)
A.
1.51 eV
B.
13.6 eV
C.
3.4 eV
D.
10.2 eV
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Solution
The ionization energy of hydrogen is 13.6 eV, which is the energy required to remove the electron from the ground state.
Correct Answer: B — 13.6 eV
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Q. What is the IUPAC name for CH3-CH2-CH2-CHO? (2020)
A.
Butanal
B.
Propanal
C.
Pentanal
D.
Hexanal
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Solution
The IUPAC name for CH3-CH2-CH2-CHO is Butanal, as it has a four-carbon chain with an aldehyde functional group.
Correct Answer: A — Butanal
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Q. What is the IUPAC name for CH3-CH2-CH2-COOH? (2020)
A.
Butanoic acid
B.
Propanoic acid
C.
Pentanoic acid
D.
Hexanoic acid
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Solution
The IUPAC name for CH3-CH2-CH2-COOH is Butanoic acid, as it has four carbon atoms.
Correct Answer: A — Butanoic acid
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Q. What is the IUPAC name for CH3CH2COOH? (2021)
A.
Propanoic acid
B.
Butanoic acid
C.
Acetic acid
D.
Formic acid
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Solution
CH3CH2COOH is propanoic acid, which has a three-carbon chain with a carboxylic acid functional group.
Correct Answer: A — Propanoic acid
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Q. What is the IUPAC name of the carboxylic acid with the formula C3H6O2? (2023)
A.
Propanoic acid
B.
Butanoic acid
C.
Acetic acid
D.
Formic acid
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Solution
The IUPAC name of C3H6O2 is Propanoic acid, which has a three-carbon chain.
Correct Answer: A — Propanoic acid
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Q. What is the jelly-like substance inside the cell called? (2018)
A.
Nucleoplasm
B.
Cytoplasm
C.
Protoplasm
D.
Chloroplast
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Solution
Cytoplasm is the jelly-like substance that fills the cell and contains organelles.
Correct Answer: B — Cytoplasm
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Q. What is the least count of a standard vernier caliper? (2021)
A.
0.01 cm
B.
0.1 cm
C.
1 cm
D.
0.001 cm
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Solution
The least count of a standard vernier caliper is typically 0.01 cm.
Correct Answer: A — 0.01 cm
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Q. What is the least count of a vernier caliper that can measure up to 0.01 cm? (2021)
A.
0.1 cm
B.
0.01 cm
C.
0.001 cm
D.
1 cm
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Solution
The least count of a vernier caliper is the smallest measurement it can accurately read, which is 0.01 cm in this case.
Correct Answer: B — 0.01 cm
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Q. What is the magnetic field inside a toroidal solenoid? (2023)
A.
Zero
B.
Uniform and non-zero
C.
Varies with position
D.
Depends on the current only
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Solution
The magnetic field inside a toroidal solenoid is uniform and non-zero, and it is given by B = (μ₀NI)/(2πr), where N is the number of turns, I is the current, and r is the distance from the center.
Correct Answer: B — Uniform and non-zero
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Q. What is the magnetic field strength at a distance 'r' from a long straight conductor carrying current 'I'? (2020)
A.
μ₀I/2πr
B.
μ₀I/4πr
C.
2μ₀I/πr
D.
μ₀I/πr
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Solution
The magnetic field strength (B) at a distance 'r' from a long straight conductor is given by the formula B = μ₀I/2πr.
Correct Answer: A — μ₀I/2πr
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Q. What is the magnetic moment of a circular loop of radius r carrying a current I? (2021)
A.
πr²I
B.
2πrI
C.
Ir²
D.
πrI
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Solution
The magnetic moment (μ) of a circular loop is given by μ = I × A, where A is the area of the loop. For a circular loop, A = πr², thus μ = I × πr² = πr²I.
Correct Answer: A — πr²I
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Q. What is the magnification produced by a concave mirror if the object distance is 10 cm and the image distance is 5 cm? (2019)
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Solution
Magnification (m) = -v/u. Here, v = -5 cm and u = -10 cm, so m = -(-5)/(-10) = 2.
Correct Answer: C — 2
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Q. What is the magnification produced by a concave mirror when the object is placed at the focus? (2019)
A.
1
B.
0
C.
Infinity
D.
Less than 1
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Solution
When the object is placed at the focus of a concave mirror, the image is formed at infinity, leading to infinite magnification.
Correct Answer: C — Infinity
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Q. What is the main advantage of asexual reproduction? (2023)
A.
Genetic diversity
B.
Faster population growth
C.
Requires two parents
D.
Involves gametes
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Solution
Asexual reproduction allows for faster population growth since it does not require finding a mate.
Correct Answer: B — Faster population growth
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Q. What is the main advantage of sexual reproduction? (2023)
A.
Faster reproduction
B.
Genetic variation
C.
Less energy required
D.
No need for a mate
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Solution
Sexual reproduction promotes genetic variation, which is beneficial for adaptation and evolution.
Correct Answer: B — Genetic variation
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Q. What is the main advantage of using biopesticides? (2022)
A.
They are more effective than chemical pesticides
B.
They are environmentally friendly
C.
They are cheaper to produce
D.
They have a longer shelf life
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Solution
Biopesticides are derived from natural materials and are considered environmentally friendly compared to chemical pesticides.
Correct Answer: B — They are environmentally friendly
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Q. What is the main advantage of using CRISPR technology in genetic engineering? (2021)
A.
High precision
B.
Low cost
C.
Speed of modification
D.
All of the above
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Solution
CRISPR technology offers high precision, low cost, and speed of modification, making it a powerful tool in genetic engineering.
Correct Answer: D — All of the above
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Q. What is the main advantage of using genetically modified organisms (GMOs) in agriculture? (2021)
A.
Higher nutritional value
B.
Increased resistance to diseases
C.
Lower production costs
D.
All of the above
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Solution
GMOs can provide higher nutritional value, increased resistance to diseases, and lower production costs.
Correct Answer: D — All of the above
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Q. What is the main advantage of using genetically modified organisms (GMOs) in food production? (2020)
A.
Higher prices
B.
Longer shelf life
C.
Increased labor costs
D.
More complex farming techniques
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Solution
GMOs can be engineered to have longer shelf lives, reducing food waste and improving food security.
Correct Answer: B — Longer shelf life
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Q. What is the main advantage of using genetically modified organisms in food production? (2021)
A.
Longer shelf life
B.
Higher nutritional value
C.
Resistance to pests and diseases
D.
All of the above
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Solution
Genetically modified organisms can provide multiple advantages including longer shelf life, higher nutritional value, and resistance to pests and diseases.
Correct Answer: D — All of the above
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Q. What is the main advantage of using hormonal contraceptives? (2023)
A.
They are 100% effective
B.
They can regulate menstrual cycles
C.
They are inexpensive
D.
They require no medical consultation
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Solution
Hormonal contraceptives can help regulate menstrual cycles in addition to preventing pregnancy.
Correct Answer: B — They can regulate menstrual cycles
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Q. What is the main advantage of using transgenic animals in research? (2021)
A.
Increased lifespan
B.
Disease modeling
C.
Higher reproduction rate
D.
Better growth rate
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Solution
Transgenic animals are primarily used in research for disease modeling, helping scientists understand human diseases.
Correct Answer: B — Disease modeling
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Q. What is the main advantage of using transgenic plants? (2022)
A.
Higher nutritional value
B.
Increased growth rate
C.
Resistance to herbicides
D.
Faster reproduction
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Solution
Transgenic plants are engineered to be resistant to herbicides, allowing for easier weed management.
Correct Answer: C — Resistance to herbicides
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Q. What is the main advantage of using yeast as a host for cloning? (2023)
A.
High growth rate
B.
Eukaryotic post-translational modifications
C.
Simple genome
D.
Low cost
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Solution
Yeast, being a eukaryote, can perform post-translational modifications similar to higher organisms, making it advantageous for expressing eukaryotic proteins.
Correct Answer: B — Eukaryotic post-translational modifications
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Q. What is the main application of CRISPR technology? (2023)
A.
Gene therapy
B.
Gene editing
C.
DNA sequencing
D.
Protein synthesis
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Solution
CRISPR technology is primarily used for gene editing, allowing precise modifications to DNA.
Correct Answer: B — Gene editing
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Q. What is the main assumption of the quantum mechanical model of the atom? (2023)
A.
Electrons are in fixed orbits
B.
Electrons have wave-like properties
C.
Electrons are stationary
D.
Electrons have no mass
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Solution
The quantum mechanical model assumes that electrons exhibit both particle and wave-like properties.
Correct Answer: B — Electrons have wave-like properties
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Q. What is the main benefit of using genetically modified crops? (2023)
A.
Higher cost of production
B.
Increased resistance to pests
C.
Decreased yield
D.
Longer growth periods
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Solution
Genetically modified crops are designed to be more resistant to pests, which can lead to higher yields and reduced pesticide use.
Correct Answer: B — Increased resistance to pests
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Q. What is the main carbohydrate found in the human diet? (2023)
A.
Starch
B.
Glycogen
C.
Cellulose
D.
Fructose
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Solution
Starch is the main carbohydrate found in the human diet, primarily sourced from plants.
Correct Answer: A — Starch
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Q. What is the main cause of tuberculosis? (2019)
A.
Bacterial infection
B.
Viral infection
C.
Fungal infection
D.
Parasitic infection
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Solution
Tuberculosis is primarily caused by the bacterium Mycobacterium tuberculosis.
Correct Answer: A — Bacterial infection
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Q. What is the main characteristic of a molecular solid? (2021)
A.
High melting point
B.
Low melting point
C.
Good electrical conductivity
D.
High density
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Solution
Molecular solids generally have low melting points due to weak intermolecular forces.
Correct Answer: B — Low melting point
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