Major Competitive Exams
Q. What is the primary argument presented in the passage regarding climate change?
A.
Climate change is a natural phenomenon.
B.
Human activities are the main cause of climate change.
C.
Climate change has no significant impact on biodiversity.
D.
The effects of climate change are reversible.
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Solution
The passage emphasizes that human activities, particularly the burning of fossil fuels, are the primary drivers of climate change.
Correct Answer: B — Human activities are the main cause of climate change.
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Q. What is the primary assumption of the kinetic theory of gases regarding the motion of gas molecules?
A.
Gas molecules are stationary.
B.
Gas molecules move in straight lines until they collide.
C.
Gas molecules are always in a state of vibration.
D.
Gas molecules have a fixed volume.
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Solution
The kinetic theory assumes that gas molecules move in straight lines until they collide with each other or the walls of the container.
Correct Answer: B — Gas molecules move in straight lines until they collide.
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Q. What is the primary bond type in polymers?
A.
Ionic bonds
B.
Covalent bonds
C.
Metallic bonds
D.
Hydrogen bonds
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Solution
Covalent bonds are the primary bond type in polymers, linking monomers together.
Correct Answer: B — Covalent bonds
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Q. What is the primary cause of a zero error? (2019)
A.
Instrument wear and tear
B.
Incorrect calibration
C.
Environmental factors
D.
User error
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Solution
A zero error occurs when an instrument does not read zero when it should, often due to incorrect calibration.
Correct Answer: B — Incorrect calibration
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Q. What is the primary cause of biodiversity loss worldwide? (2020)
A.
Climate change
B.
Habitat destruction
C.
Pollution
D.
Overexploitation
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Solution
Habitat destruction is the primary cause of biodiversity loss, as it leads to the loss of species and ecosystems.
Correct Answer: B — Habitat destruction
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Q. What is the primary cause of buoyancy in fluids?
A.
Surface tension
B.
Pressure difference
C.
Viscosity
D.
Density
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Solution
Buoyancy is primarily caused by the pressure difference between the top and bottom of an object submerged in a fluid.
Correct Answer: B — Pressure difference
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Q. What is the primary cause of capillary action in liquids?
A.
Cohesion
B.
Adhesion
C.
Viscosity
D.
Density
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Solution
Capillary action is primarily caused by adhesion, where the liquid molecules are attracted to the surface of the solid.
Correct Answer: B — Adhesion
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Q. What is the primary cause of global warming?
A.
Deforestation
B.
Greenhouse gas emissions
C.
Ozone depletion
D.
Acid rain
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Solution
Greenhouse gas emissions, particularly CO2, are the primary cause of global warming.
Correct Answer: B — Greenhouse gas emissions
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Q. What is the primary cause of ocean acidification?
A.
Plastic pollution
B.
Increased CO2 absorption
C.
Heavy metal contamination
D.
Thermal pollution
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Solution
Ocean acidification is primarily caused by the increased absorption of CO2 from the atmosphere into ocean waters.
Correct Answer: B — Increased CO2 absorption
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Q. What is the primary cause of ocean currents?
A.
Wind patterns
B.
Earth's rotation
C.
Temperature differences
D.
Salinity differences
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Solution
The primary cause of ocean currents is wind patterns, which drive the movement of water across the surface.
Correct Answer: A — Wind patterns
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Q. What is the primary cause of surface tension in liquids?
A.
Cohesive forces
B.
Adhesive forces
C.
Gravitational forces
D.
Electromagnetic forces
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Solution
Surface tension is primarily caused by cohesive forces between liquid molecules, which create a 'skin' at the surface.
Correct Answer: A — Cohesive forces
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Q. What is the primary cause of the greenhouse effect?
A.
Ozone depletion
B.
Increased solar radiation
C.
Trapping of heat by greenhouse gases
D.
Deforestation
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Solution
The greenhouse effect is primarily caused by the trapping of heat in the Earth's atmosphere by greenhouse gases.
Correct Answer: C — Trapping of heat by greenhouse gases
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Q. What is the primary cause of the phenomenon known as capillarity?
A.
Cohesion
B.
Adhesion
C.
Viscosity
D.
Density
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Solution
Capillarity is primarily caused by adhesion, which is the attraction between the liquid molecules and the surface of the solid.
Correct Answer: B — Adhesion
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Q. What is the primary cause of the phenomenon of buoyancy?
A.
Surface tension
B.
Pressure difference
C.
Viscosity
D.
Density
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Solution
Buoyancy is caused by the pressure difference between the top and bottom of an object submerged in a fluid.
Correct Answer: B — Pressure difference
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Q. What is the primary cause of the phenomenon of capillarity?
A.
Cohesion
B.
Adhesion
C.
Viscosity
D.
Density
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Solution
Capillarity is primarily caused by adhesion, which is the attraction between the liquid molecules and the surface of the solid.
Correct Answer: B — Adhesion
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Q. What is the primary cause of tides on Earth? (2019)
A.
Wind
B.
Earth's rotation
C.
Gravitational pull of the moon
D.
Ocean currents
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Solution
The primary cause of tides on Earth is the gravitational pull of the moon.
Correct Answer: C — Gravitational pull of the moon
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Q. What is the primary cause of tuberculosis? (2020)
A.
Bacteria
B.
Virus
C.
Fungi
D.
Protozoa
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Solution
Tuberculosis is primarily caused by the bacterium Mycobacterium tuberculosis.
Correct Answer: A — Bacteria
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Q. What is the primary cause of viscosity in fluids?
A.
Molecular interactions
B.
Temperature
C.
Pressure
D.
Density
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Solution
Viscosity arises primarily from molecular interactions within the fluid, which resist flow.
Correct Answer: A — Molecular interactions
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Q. What is the primary characteristic of a K-selected species? (2023)
A.
High reproductive rate
B.
Short lifespan
C.
High parental care
D.
Rapid growth
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Solution
K-selected species typically exhibit high parental care and invest more resources in fewer offspring.
Correct Answer: C — High parental care
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Q. What is the primary characteristic of adsorption? (2023)
A.
It is a bulk phenomenon.
B.
It involves a chemical reaction.
C.
It is a surface phenomenon.
D.
It requires high temperature.
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Solution
Adsorption is a surface phenomenon where molecules adhere to the surface of a solid or liquid.
Correct Answer: C — It is a surface phenomenon.
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Q. What is the primary characteristic of alkaline earth metals? (2020)
A.
They are highly reactive
B.
They have a +2 oxidation state
C.
They are gases at room temperature
D.
They form covalent bonds
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Solution
Alkaline earth metals typically have a +2 oxidation state due to the loss of two electrons.
Correct Answer: B — They have a +2 oxidation state
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Q. What is the primary characteristic of Baroque art that emerged in the 17th century?
A.
Emphasis on emotion and movement
B.
Use of geometric shapes
C.
Focus on minimalism
D.
Incorporation of abstract forms
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Solution
Baroque art is characterized by its dramatic use of light and shadow, emotional intensity, and a sense of movement, reflecting the complexities of the human experience.
Correct Answer: A — Emphasis on emotion and movement
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Q. What is the primary characteristic of gases compared to solids and liquids? (2023)
A.
Definite shape
B.
Definite volume
C.
High compressibility
D.
Low density
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Solution
Gases have high compressibility due to the large spaces between particles, unlike solids and liquids which have definite shape and volume.
Correct Answer: C — High compressibility
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Q. What is the primary characteristic of gases? (2023)
A.
Definite shape
B.
Definite volume
C.
Compressibility
D.
Incompressibility
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Solution
Gases are highly compressible due to the large spaces between particles, allowing them to occupy more volume when pressure is applied.
Correct Answer: C — Compressibility
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Q. What is the primary characteristic of insulators? (2019)
A.
Conduct electricity
B.
Absorb heat
C.
Prevent electricity flow
D.
Reflect light
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Solution
Insulators are materials that prevent the flow of electricity.
Correct Answer: C — Prevent electricity flow
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Q. What is the primary characteristic of liquids that distinguishes them from solids?
A.
Definite shape
B.
Definite volume
C.
Incompressibility
D.
Fluidity
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Solution
Liquids have fluidity, allowing them to flow and take the shape of their container.
Correct Answer: D — Fluidity
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Q. What is the primary characteristic of non-metals?
A.
Good conductors of heat
B.
High density
C.
Brittleness
D.
Luster
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Solution
Non-metals are generally brittle in solid form and do not exhibit metallic luster.
Correct Answer: C — Brittleness
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Q. What is the primary characteristic that distinguishes living organisms from non-living things? (2020)
A.
Ability to reproduce
B.
Ability to move
C.
Ability to grow
D.
Ability to respond to stimuli
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Solution
The primary characteristic that distinguishes living organisms from non-living things is their ability to reproduce, which is essential for the continuation of species.
Correct Answer: A — Ability to reproduce
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Q. What is the primary charge carrier in n-type semiconductors?
A.
Holes
B.
Electrons
C.
Protons
D.
Neutrons
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Solution
In n-type semiconductors, electrons are the majority charge carriers due to the addition of donor impurities.
Correct Answer: B — Electrons
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Q. What is the primary charge carrier in P-type semiconductors?
A.
Electrons
B.
Holes
C.
Protons
D.
Neutrons
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Solution
In P-type semiconductors, holes are the primary charge carriers.
Correct Answer: B — Holes
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