Q. What is the main purpose of using genetically modified crops? (2023)
A.
To produce more flowers
B.
To enhance flavor
C.
To improve resistance to diseases
D.
To reduce labor costs
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Solution
Genetically modified crops are primarily developed to improve resistance to diseases, pests, and environmental conditions.
Correct Answer: C — To improve resistance to diseases
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Q. What is the main purpose of using significant figures in measurements? (2019)
A.
To increase the number of digits
B.
To indicate precision
C.
To simplify calculations
D.
To convert units
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Solution
Significant figures indicate the precision of a measurement, reflecting the certainty of the digits.
Correct Answer: B — To indicate precision
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Q. What is the main reproductive structure of angiosperms? (2021)
A.
Cone
B.
Flower
C.
Sporangium
D.
Thallus
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Solution
The main reproductive structure of angiosperms is the flower, which facilitates reproduction through pollination.
Correct Answer: B — Flower
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Q. What is the main role of dietary fiber in human health? (2021)
A.
Increase cholesterol
B.
Aid digestion
C.
Provide energy
D.
Enhance taste
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Solution
Dietary fiber aids digestion by promoting regular bowel movements and preventing constipation.
Correct Answer: B — Aid digestion
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Q. What is the main site of protein digestion in the digestive system? (2021)
A.
Mouth
B.
Stomach
C.
Small intestine
D.
Large intestine
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Solution
Protein digestion primarily occurs in the stomach, where pepsin breaks down proteins into peptides.
Correct Answer: B — Stomach
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Q. What is the main site of protein digestion? (2021)
A.
Mouth
B.
Stomach
C.
Small intestine
D.
Large intestine
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Solution
Protein digestion begins in the stomach, where pepsin breaks down proteins into peptides.
Correct Answer: B — Stomach
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Q. What is the main source of omega-3 fatty acids? (2021)
A.
Fish oil
B.
Butter
C.
Coconut oil
D.
Olive oil
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Solution
Fish oil is a rich source of omega-3 fatty acids, which are important for heart health and brain function.
Correct Answer: A — Fish oil
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Q. What is the main source of ozone depletion? (2021)
A.
Carbon dioxide
B.
Chlorofluorocarbons (CFCs)
C.
Methane
D.
Nitrous oxide
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Solution
Chlorofluorocarbons (CFCs) are the primary substances responsible for ozone layer depletion.
Correct Answer: B — Chlorofluorocarbons (CFCs)
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Q. What is the main source of ozone layer depletion? (2021)
A.
Carbon dioxide
B.
Chlorofluorocarbons (CFCs)
C.
Methane
D.
Nitrous oxide
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Solution
Chlorofluorocarbons (CFCs) are the primary substances responsible for the depletion of the ozone layer.
Correct Answer: B — Chlorofluorocarbons (CFCs)
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Q. What is the main source of plastic pollution in oceans? (2021)
A.
Industrial waste
B.
Agricultural runoff
C.
Single-use plastics
D.
Sewage discharge
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Solution
Single-use plastics, such as bags and bottles, are a major contributor to plastic pollution in oceans.
Correct Answer: C — Single-use plastics
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Q. What is the main substrate for respiration in plants? (2023)
A.
Starch
B.
Glucose
C.
Cellulose
D.
Sucrose
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Solution
Glucose is the main substrate for respiration in plants, as it is broken down to release energy.
Correct Answer: B — Glucose
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Q. What is the main vector for malaria transmission? (2021)
A.
Housefly
B.
Mosquito
C.
Tick
D.
Flea
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Solution
Malaria is primarily transmitted by the female Anopheles mosquito.
Correct Answer: B — Mosquito
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Q. What is the main vector for the transmission of malaria? (2019)
A.
Housefly
B.
Mosquito
C.
Tick
D.
Flea
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Solution
Malaria is primarily transmitted through the bite of infected female Anopheles mosquitoes.
Correct Answer: B — Mosquito
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Q. What is the male gamete in flowering plants called? (2020)
A.
Ovule
B.
Pollen
C.
Style
D.
Stigma
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Solution
The male gamete in flowering plants is called pollen, which is produced in the anthers of the stamen.
Correct Answer: B — Pollen
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Q. What is the male reproductive part of a flower called? (2020)
A.
Stigma
B.
Anther
C.
Ovary
D.
Style
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Solution
The male reproductive part of a flower is called the stamen, which consists of the anther and filament. The anther is the part that produces pollen.
Correct Answer: B — Anther
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Q. What is the mass defect of a nucleus? (2019)
A.
The difference between the mass of the nucleus and the sum of the masses of its individual nucleons
B.
The mass of the nucleus itself
C.
The mass of the electrons surrounding the nucleus
D.
The mass of the nucleus in a different state
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Solution
The mass defect is the difference between the mass of the nucleus and the sum of the masses of its individual nucleons, which accounts for the binding energy.
Correct Answer: A — The difference between the mass of the nucleus and the sum of the masses of its individual nucleons
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Q. What is the maximum displacement from the mean position in simple harmonic motion called? (2022)
A.
Amplitude
B.
Frequency
C.
Period
D.
Wavelength
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Solution
The maximum displacement from the mean position in simple harmonic motion is called the amplitude.
Correct Answer: A — Amplitude
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Q. What is the maximum number of electrons that can be accommodated in the d subshell? (2019)
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Solution
The d subshell can hold a maximum of 10 electrons.
Correct Answer: C — 10
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Q. What is the maximum number of electrons that can be accommodated in the p subshell? (2023)
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Solution
The p subshell can hold a maximum of 6 electrons.
Correct Answer: B — 6
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Q. What is the maximum number of electrons that can occupy the n=3 energy level in an atom? (2021)
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Solution
The maximum number of electrons in an energy level is given by the formula 2n². For n=3, it is 2(3)² = 18.
Correct Answer: C — 18
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Q. What is the maximum number of electrons that can occupy the n=4 energy level? (2021)
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Solution
The maximum number of electrons in an energy level is given by 2n^2. For n=4, it is 2(4^2) = 32.
Correct Answer: B — 18
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Q. What is the minimum thickness of a soap bubble for which the first order of bright fringe is observed in reflected light? (2020)
A.
λ/4
B.
λ/2
C.
λ
D.
3λ/4
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Solution
For the first order of bright fringe in reflected light, the minimum thickness of the soap bubble is λ/4 due to the phase change upon reflection.
Correct Answer: A — λ/4
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Q. What is the molality of a solution containing 3 moles of solute in 1 kg of solvent? (2022)
A.
3 m
B.
1.5 m
C.
0.5 m
D.
2 m
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Solution
Molality (m) = moles of solute / kg of solvent = 3 moles / 1 kg = 3 m.
Correct Answer: A — 3 m
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Q. What is the molality of a solution containing 3 moles of solute in 500 g of solvent? (2021)
A.
6 m
B.
3 m
C.
1.5 m
D.
0.5 m
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Solution
Molality (m) = moles of solute / kg of solvent = 3 moles / 0.5 kg = 6 m.
Correct Answer: B — 3 m
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Q. What is the molecular formula of cyclohexane? (2022)
A.
C6H12
B.
C6H10
C.
C6H14
D.
C6H6
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Solution
Cyclohexane is a cyclic alkane with the formula C6H12.
Correct Answer: A — C6H12
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Q. What is the molecular formula of ethyne? (2022)
A.
C2H2
B.
C2H4
C.
C2H6
D.
C3H4
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Solution
Ethyne, also known as acetylene, has the molecular formula C2H2.
Correct Answer: A — C2H2
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Q. What is the molecular formula of the simplest alkyne? (2022)
A.
C2H2
B.
C2H4
C.
C3H4
D.
C3H6
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Solution
The simplest alkyne is ethyne (acetylene) with the molecular formula C2H2.
Correct Answer: A — C2H2
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Q. What is the monomer of nucleic acids? (2023)
A.
Amino acid
B.
Nucleotide
C.
Monosaccharide
D.
Fatty acid
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Solution
Nucleotides are the monomers that make up nucleic acids.
Correct Answer: B — Nucleotide
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Q. What is the nature of the image formed by a concave mirror when the object is placed between the focal point and the mirror? (2021)
A.
Real and inverted
B.
Virtual and erect
C.
Real and erect
D.
Virtual and inverted
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Solution
When the object is placed between the focal point and the mirror, the image formed is virtual and erect.
Correct Answer: B — Virtual and erect
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Q. What is the nature of the image formed by a convex lens when the object is placed beyond the 2F point? (2019)
A.
Real and inverted
B.
Virtual and erect
C.
Real and erect
D.
Virtual and inverted
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Solution
When the object is placed beyond 2F, the image formed by a convex lens is real, inverted, and diminished.
Correct Answer: A — Real and inverted
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