Q. What is the main characteristic of amorphous solids? (2023)
A.
Long-range order
B.
Short-range order
C.
Definite melting point
D.
Anisotropic
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Solution
Amorphous solids lack long-range order, which distinguishes them from crystalline solids.
Correct Answer: B — Short-range order
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Q. What is the main characteristic of cardiac muscle tissue? (2023)
A.
Multinucleated
B.
Involuntary and striated
C.
Non-striated and voluntary
D.
Highly regenerative
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Solution
Cardiac muscle tissue is involuntary and striated, found only in the heart, and is responsible for pumping blood.
Correct Answer: B — Involuntary and striated
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Q. What is the main characteristic of mammals? (2021)
A.
Cold-blooded
B.
Feathers
C.
Hair or fur
D.
Scales
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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 organisms in the phylum Mollusca? (2022)
A.
Jointed appendages
B.
Soft-bodied with a hard shell
C.
Radial symmetry
D.
Exoskeleton
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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
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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
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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
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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 plasma in blood? (2023)
A.
Water
B.
Proteins
C.
Electrolytes
D.
Hormones
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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 the cell wall in plant cells? (2023)
A.
Cellulose
B.
Chitin
C.
Peptidoglycan
D.
Lipid
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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
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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 gas known as 'syngas'? (2023)
A.
Carbon dioxide
B.
Hydrogen
C.
Methane
D.
Nitrogen
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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 urine? (2022)
A.
Water
B.
Urea
C.
Sodium chloride
D.
Creatinine
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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 consequence of nuclear fusion? (2023)
A.
Release of energy
B.
Formation of heavier elements
C.
Emission of alpha particles
D.
All of the above
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Solution
The main consequence of nuclear fusion is the release of a significant amount of energy as lighter nuclei combine to form heavier nuclei.
Correct Answer: A — Release of energy
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Q. What is the main consequence of plastic pollution in oceans? (2023)
A.
Increased fish populations
B.
Coral reef restoration
C.
Marine life entanglement
D.
Improved water quality
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Solution
Plastic pollution in oceans leads to entanglement and ingestion by marine life, causing injury and death to various species.
Correct Answer: C — Marine life entanglement
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Q. What is the main difference between isotopes of an element? (2022)
A.
Number of protons
B.
Number of neutrons
C.
Number of electrons
D.
Chemical properties
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Solution
Isotopes of an element differ in the number of neutrons while having the same number of protons.
Correct Answer: B — Number of neutrons
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Q. What is the main difference between the kingdoms Fungi and Plantae? (2022)
A.
Cell wall composition
B.
Mode of nutrition
C.
Reproductive methods
D.
All of the above
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Solution
The main differences between the kingdoms Fungi and Plantae include cell wall composition (chitin in fungi vs cellulose in plants) and mode of nutrition (heterotrophic in fungi vs autotrophic in plants).
Correct Answer: D — All of the above
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Q. What is the main disadvantage of asexual reproduction? (2022)
A.
Slower reproduction rate
B.
Lack of genetic variation
C.
Requires more energy
D.
Involves two parents
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Solution
The main disadvantage of asexual reproduction is the lack of genetic variation, which can make populations vulnerable to diseases.
Correct Answer: B — Lack of genetic variation
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Q. What is the main driving force behind adaptive radiation? (1959)
A.
Environmental changes
B.
Genetic mutations
C.
Isolation
D.
All of the above
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Solution
Adaptive radiation occurs when a single ancestor species rapidly diversifies into a wide variety of forms to adapt to different environments, driven by environmental changes, genetic mutations, and isolation.
Correct Answer: D — All of the above
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Q. What is the main driving force for the movement of water in plants? (2023)
A.
Root pressure
B.
Capillary action
C.
Transpiration pull
D.
Gravity
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Solution
Transpiration pull, created by the evaporation of water from the leaves, is the main driving force for water movement in plants.
Correct Answer: C — Transpiration pull
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Q. What is the main driving force for the movement of water in the xylem?
A.
Root pressure
B.
Capillary action
C.
Transpiration pull
D.
Gravity
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Solution
Transpiration pull, created by the evaporation of water from the leaf surface, is the main driving force for water movement in the xylem.
Correct Answer: C — Transpiration pull
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Q. What is the main driving force for the movement of water through the xylem?
A.
Root pressure
B.
Capillary action
C.
Transpiration pull
D.
Gravity
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Solution
Transpiration pull, created by the evaporation of water from the leaves, is the main driving force for water movement in xylem.
Correct Answer: C — Transpiration pull
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Q. What is the main effect of deforestation on biodiversity? (2019)
A.
Increase in species diversity
B.
Habitat loss
C.
Improvement in ecosystem services
D.
Reduction in carbon footprint
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Solution
Deforestation leads to habitat loss, which is a major threat to biodiversity.
Correct Answer: B — Habitat loss
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Q. What is the main effect of deforestation on the environment? (2019)
A.
Increased biodiversity
B.
Soil conservation
C.
Loss of habitat
D.
Improved air quality
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Solution
Deforestation leads to the loss of habitat for many species, resulting in decreased biodiversity.
Correct Answer: C — Loss of habitat
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Q. What is the main energy source for muscle contraction? (2023)
A.
Glucose
B.
Fatty acids
C.
ATP
D.
Creatine phosphate
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Solution
Adenosine triphosphate (ATP) is the main energy source for muscle contraction.
Correct Answer: C — ATP
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Q. What is the main environmental concern associated with plastic waste? (2022)
A.
Air pollution
B.
Soil degradation
C.
Water contamination
D.
All of the above
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Solution
Plastic waste poses multiple environmental concerns, including air pollution from incineration, soil degradation, and water contamination.
Correct Answer: D — All of the above
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Q. What is the main enzyme involved in protein digestion in the stomach? (2021)
A.
Amylase
B.
Pepsin
C.
Trypsin
D.
Lipase
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Solution
Pepsin is the main enzyme that digests proteins in the acidic environment of the stomach.
Correct Answer: B — Pepsin
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Q. What is the main excretory product of purine metabolism? (2022)
A.
Urea
B.
Creatinine
C.
Uric acid
D.
Ammonia
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Solution
Uric acid is the main excretory product of purine metabolism in humans.
Correct Answer: C — Uric acid
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Q. What is the main factor that determines the type of ecosystem in a particular area? (2019)
A.
Soil type
B.
Climate
C.
Topography
D.
Human activity
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Solution
Climate is the main factor that determines the type of ecosystem, influencing temperature and precipitation patterns.
Correct Answer: B — Climate
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Q. What is the main force that holds the nucleus together? (2020)
A.
Electromagnetic force
B.
Gravitational force
C.
Weak nuclear force
D.
Strong nuclear force
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Solution
The strong nuclear force is the primary force that holds the nucleons (protons and neutrons) together in the nucleus.
Correct Answer: D — Strong nuclear force
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Q. What is the main function of a transformer? (2014)
A.
Increase voltage
B.
Decrease voltage
C.
Change AC to DC
D.
Store energy
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Solution
The main function of a transformer is to increase or decrease the voltage in an AC circuit.
Correct Answer: A — Increase voltage
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