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 a gas and a plasma?
A.
Density
B.
Temperature
C.
Ionization
D.
Volume
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Solution
Plasma is ionized gas, meaning it has free electrons and ions, while gas does not.
Correct Answer:
C
— Ionization
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Q. What is the main difference between a liquid and a gas?
A.
Shape
B.
Volume
C.
Density
D.
All of the above
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Solution
Liquids have a definite volume and take the shape of their container, while gases have neither a definite shape nor volume.
Correct Answer:
D
— All of the above
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Q. What is the main difference between adsorption and absorption?
A.
Adsorption involves a surface phenomenon
B.
Absorption is a surface phenomenon
C.
Both are the same
D.
Adsorption is faster than absorption
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Solution
Adsorption is a surface phenomenon, while absorption involves the entire volume of the material.
Correct Answer:
A
— Adsorption involves a surface phenomenon
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Q. What is the main difference between aldehydes and ketones?
A.
Position of the carbonyl group
B.
Number of carbon atoms
C.
Presence of hydrogen
D.
All of the above
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Solution
The main difference is the position of the carbonyl group; aldehydes have it at the end of the carbon chain, while ketones have it within the chain.
Correct Answer:
A
— Position of the carbonyl group
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Q. What is the main difference between alpha and beta radiation?
A.
Charge
B.
Mass
C.
Speed
D.
Penetrating power
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Solution
Alpha particles have a much greater mass than beta particles, which are electrons or positrons.
Correct Answer:
B
— Mass
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Q. What is the main difference between classical and quantum mechanics?
A.
Determinism vs. probability
B.
Energy conservation
C.
Force laws
D.
Motion equations
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Solution
The main difference is that classical mechanics is deterministic, while quantum mechanics incorporates probability.
Correct Answer:
A
— Determinism vs. probability
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Q. What is the main difference between diffraction and interference?
A.
Diffraction involves multiple sources, interference does not
B.
Interference involves multiple sources, diffraction does not
C.
Diffraction occurs with sound waves only
D.
Interference occurs with light waves only
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Solution
Interference involves the superposition of waves from multiple sources, while diffraction is the spreading of waves when they encounter an obstacle or aperture.
Correct Answer:
B
— Interference involves multiple sources, diffraction does not
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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 nuclear fission and nuclear fusion?
A.
Fission combines nuclei, fusion splits them
B.
Fission splits nuclei, fusion combines them
C.
Fission occurs in stars, fusion occurs in reactors
D.
Fission is safer than fusion
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Solution
Nuclear fission involves the splitting of a heavy nucleus into smaller nuclei, while nuclear fusion involves the combining of light nuclei to form a heavier nucleus.
Correct Answer:
B
— Fission splits nuclei, fusion combines them
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Q. What is the main difference between nuclear fusion and nuclear fission?
A.
Fusion combines nuclei, fission splits them
B.
Fusion splits nuclei, fission combines them
C.
Fusion occurs in stars, fission occurs in reactors
D.
Both are the same process
Show solution
Solution
The main difference is that nuclear fusion combines light nuclei to form a heavier nucleus, while nuclear fission splits a heavy nucleus into lighter nuclei.
Correct Answer:
A
— Fusion combines nuclei, fission splits them
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Q. What is the main difference between physisorption and chemisorption?
A.
Temperature dependence
B.
Nature of forces involved
C.
Reversibility
D.
All of the above
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Solution
The main difference lies in the nature of forces involved; physisorption is due to weak van der Waals forces, while chemisorption involves strong chemical bonds.
Correct Answer:
D
— All of the above
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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
Show solution
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 effect of heavy metal pollution in water bodies?
A.
Increased biodiversity
B.
Eutrophication
C.
Bioaccumulation
D.
Oxygenation
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Solution
Heavy metal pollution can lead to bioaccumulation in aquatic organisms, which can have harmful effects on the food chain.
Correct Answer:
C
— Bioaccumulation
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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 environmental concern associated with the use of chlorofluorocarbons (CFCs)?
A.
Ozone layer depletion
B.
Global warming
C.
Acid rain
D.
Water pollution
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Solution
Chlorofluorocarbons (CFCs) are primarily known for their role in ozone layer depletion.
Correct Answer:
A
— Ozone layer depletion
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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 affects the climate of a region? (2022)
A.
Altitude
B.
Latitude
C.
Longitude
D.
Population
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Solution
Latitude is the main factor that affects the climate of a region.
Correct Answer:
B
— Latitude
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Q. What is the main factor that determines the climate of a region?
A.
Altitude
B.
Latitude
C.
Longitude
D.
Proximity to water bodies
Show solution
Solution
Latitude is the main factor that determines the climate of a region.
Correct Answer:
B
— Latitude
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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
Show solution
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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