Q. What is the main characteristic of elastomers?
-
A.
Brittle
-
B.
Elastic
-
C.
Rigid
-
D.
Transparent
Solution
Elastomers are characterized by their elastic properties, allowing them to stretch and return to their original shape.
Correct Answer:
B
— Elastic
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Q. What is the main characteristic of geometric isomers?
-
A.
Different connectivity
-
B.
Different spatial arrangement
-
C.
Different molecular formula
-
D.
Different functional groups
Solution
Geometric isomers have the same connectivity but differ in the spatial arrangement of groups around a double bond.
Correct Answer:
B
— Different spatial arrangement
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Q. What is the main characteristic of mammals? (2021)
-
A.
Cold-blooded
-
B.
Feathers
-
C.
Hair or fur
-
D.
Scales
Solution
Mammals are characterized by the presence of hair or fur and mammary glands that produce milk.
Correct Answer:
C
— Hair or fur
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Q. What is the main characteristic of optical isomers?
-
A.
Different boiling points
-
B.
Different melting points
-
C.
Different optical activities
-
D.
Different molecular weights
Solution
Optical isomers differ in their ability to rotate plane-polarized light.
Correct Answer:
C
— Different optical activities
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Q. What is the main characteristic of organisms in the phylum Mollusca? (2022)
-
A.
Jointed appendages
-
B.
Soft-bodied with a hard shell
-
C.
Radial symmetry
-
D.
Exoskeleton
Solution
Mollusca are primarily soft-bodied animals, many of which have a hard shell for protection.
Correct Answer:
B
— Soft-bodied with a hard shell
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Q. What is the main characteristic of organisms in the phylum Porifera? (2022)
-
A.
Presence of a true coelom
-
B.
Body symmetry
-
C.
Presence of pores
-
D.
Presence of a notochord
Solution
Organisms in the phylum Porifera, commonly known as sponges, are characterized by the presence of pores in their body.
Correct Answer:
C
— Presence of pores
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Q. What is the main characteristic of the phylum Mollusca? (2021)
-
A.
Jointed legs
-
B.
Soft-bodied with a hard shell
-
C.
Radial symmetry
-
D.
Exoskeleton made of chitin
Solution
Mollusca are primarily soft-bodied animals, many of which have a hard shell for protection.
Correct Answer:
B
— Soft-bodied with a hard shell
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Q. What is the main characteristic of the phylum Porifera? (2021)
-
A.
Presence of a true coelom
-
B.
Body symmetry
-
C.
Presence of pores
-
D.
Presence of a notochord
Solution
Porifera, or sponges, are characterized by the presence of numerous pores (ostia) in their body.
Correct Answer:
C
— Presence of pores
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Q. What is the main component of a nuclear reactor that slows down neutrons? (2023)
-
A.
Control rods
-
B.
Moderator
-
C.
Coolant
-
D.
Shielding
Solution
The moderator is the main component in a nuclear reactor that slows down neutrons to sustain the nuclear chain reaction.
Correct Answer:
B
— Moderator
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Q. What is the main component of air?
-
A.
Oxygen
-
B.
Nitrogen
-
C.
Carbon Dioxide
-
D.
Argon
Solution
Nitrogen makes up about 78% of the Earth's atmosphere, making it the main component of air.
Correct Answer:
B
— Nitrogen
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Q. What is the main component of cell membranes?
-
A.
Proteins
-
B.
Carbohydrates
-
C.
Phospholipids
-
D.
Nucleic acids
Solution
Phospholipids are the main component of cell membranes, forming a bilayer.
Correct Answer:
C
— Phospholipids
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Q. What is the main component of natural gas?
-
A.
Ethane
-
B.
Propane
-
C.
Methane
-
D.
Butane
Solution
The main component of natural gas is methane (CH4).
Correct Answer:
C
— Methane
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Q. What is the main component of natural rubber?
-
A.
Polyisoprene
-
B.
Polystyrene
-
C.
Polyethylene
-
D.
Polyvinyl acetate
Solution
Natural rubber is primarily composed of polyisoprene, which is derived from latex.
Correct Answer:
A
— Polyisoprene
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Q. What is the main component of plasma in blood? (2023)
-
A.
Water
-
B.
Proteins
-
C.
Electrolytes
-
D.
Hormones
Solution
Plasma is primarily composed of about 90% water, which serves as a solvent for various substances in the blood.
Correct Answer:
A
— Water
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Q. What is the main component of smog?
-
A.
Ozone
-
B.
Carbon dioxide
-
C.
Nitrogen
-
D.
Sulfur dioxide
Solution
Ozone is a major component of smog, particularly in urban areas during sunny days.
Correct Answer:
A
— Ozone
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Q. What is the main component of the cell membrane?
-
A.
Proteins
-
B.
Carbohydrates
-
C.
Phospholipids
-
D.
Nucleic acids
Solution
Phospholipids are the main component of cell membranes, forming a bilayer.
Correct Answer:
C
— Phospholipids
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Q. What is the main component of the cell wall in plant cells? (2023)
-
A.
Cellulose
-
B.
Chitin
-
C.
Peptidoglycan
-
D.
Lipid
Solution
The cell wall of plant cells is primarily made of cellulose, which provides structural support.
Correct Answer:
A
— Cellulose
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Q. What is the main component of the cell wall in plants? (2022)
-
A.
Cellulose
-
B.
Chitin
-
C.
Peptidoglycan
-
D.
Lipid
Solution
The main component of the plant cell wall is cellulose.
Correct Answer:
A
— Cellulose
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Q. What is the main component of the Earth's atmosphere? (2022)
-
A.
Oxygen
-
B.
Nitrogen
-
C.
Carbon Dioxide
-
D.
Argon
Solution
Nitrogen is the main component of the Earth's atmosphere, making up about 78% of it.
Correct Answer:
B
— Nitrogen
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Q. What is the main component of the Earth's mantle? (2019)
-
A.
Silicate minerals
-
B.
Iron
-
C.
Nickel
-
D.
Water
Solution
The Earth's mantle is mainly composed of silicate minerals, which include olivine and pyroxene.
Correct Answer:
A
— Silicate minerals
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Q. What is the main component of the gas known as 'syngas'? (2023)
-
A.
Carbon dioxide
-
B.
Hydrogen
-
C.
Methane
-
D.
Nitrogen
Solution
Syngas primarily consists of hydrogen and carbon monoxide, used in various chemical processes.
Correct Answer:
B
— Hydrogen
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Q. What is the main component of the gas used in hydrogen fuel cells?
-
A.
Oxygen
-
B.
Hydrogen
-
C.
Carbon dioxide
-
D.
Nitrogen
Solution
The main component of the gas used in hydrogen fuel cells is hydrogen.
Correct Answer:
B
— Hydrogen
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Q. What is the main component of urine? (2022)
-
A.
Water
-
B.
Urea
-
C.
Sodium chloride
-
D.
Creatinine
Solution
The main component of urine is water, which makes up about 95% of its volume.
Correct Answer:
A
— Water
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Q. What is the main component of vinegar?
-
A.
Acetic acid
-
B.
Citric acid
-
C.
Lactic acid
-
D.
Formic acid
Solution
Vinegar primarily consists of acetic acid, which gives it its sour taste.
Correct Answer:
A
— Acetic acid
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Q. What is the main component of water gas?
Solution
Water gas is primarily composed of hydrogen (H2) and carbon monoxide (CO).
Correct Answer:
A
— H2
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Q. What is the main concept of quantum mechanics that distinguishes it from classical mechanics? (2023)
-
A.
Determinism
-
B.
Wave-particle duality
-
C.
Conservation of energy
-
D.
Newton's laws
Solution
Wave-particle duality is a fundamental concept of quantum mechanics, indicating that particles exhibit both wave and particle properties.
Correct Answer:
B
— Wave-particle duality
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Q. What is the main conclusion drawn from the research on urbanization and wildlife?
-
A.
Urbanization has no effect on wildlife populations.
-
B.
Wildlife adapts easily to urban environments.
-
C.
Urbanization poses significant threats to wildlife habitats.
-
D.
Wildlife thrives in urban settings due to human activity.
Solution
The research indicates that urbanization significantly disrupts wildlife habitats and populations.
Correct Answer:
C
— Urbanization poses significant threats to wildlife habitats.
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Q. What is the main conclusion drawn in the article about the effects of globalization?
-
A.
Globalization has only negative effects on local cultures.
-
B.
Globalization fosters economic growth and cultural exchange.
-
C.
Globalization leads to job losses in developed countries.
-
D.
Globalization is a recent phenomenon with no historical precedent.
Solution
The article concludes that globalization, while presenting challenges, also promotes economic growth and cultural exchange.
Correct Answer:
B
— Globalization fosters economic growth and cultural exchange.
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Q. What is the main conclusion drawn in the passage regarding the future of renewable energy? (2023)
-
A.
It will replace fossil fuels entirely within a decade.
-
B.
It faces significant barriers to widespread adoption.
-
C.
It is a temporary solution to energy needs.
-
D.
It is not a viable option for developing countries.
Solution
The passage concludes that renewable energy faces significant barriers to widespread adoption, which aligns with option B.
Correct Answer:
B
— It faces significant barriers to widespread adoption.
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Q. What is the main consequence of acid rain?
-
A.
Increased soil fertility
-
B.
Corrosion of buildings
-
C.
Reduction of greenhouse gases
-
D.
Improvement of water quality
Solution
Acid rain leads to the corrosion of buildings and monuments, as well as harming aquatic ecosystems.
Correct Answer:
B
— Corrosion of buildings
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