Q. Which of the following polynomials is a perfect square?
-
A.
x^2 + 4x + 4
-
B.
x^2 - 4
-
C.
x^2 + 2x + 3
-
D.
x^2 - 2x + 1
Solution
The polynomial x^2 + 4x + 4 can be factored as (x + 2)^2, making it a perfect square.
Correct Answer:
A
— x^2 + 4x + 4
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Q. Which of the following polynomials is a quadratic polynomial?
-
A.
x^3 - 2x + 1
-
B.
2x^2 + 3x - 5
-
C.
4x + 7
-
D.
x^4 - x^2 + 1
Solution
A quadratic polynomial is defined as a polynomial of degree 2, which is 2x^2 + 3x - 5.
Correct Answer:
B
— 2x^2 + 3x - 5
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Q. Which of the following practices can help conserve biodiversity? (2021)
-
A.
Deforestation
-
B.
Overfishing
-
C.
Sustainable tourism
-
D.
Pollution
Solution
Sustainable tourism can help conserve biodiversity by promoting responsible travel that does not harm ecosystems.
Correct Answer:
C
— Sustainable tourism
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Q. Which of the following practices can help in conserving biodiversity? (2021)
-
A.
Monoculture farming
-
B.
Deforestation
-
C.
Sustainable agriculture
-
D.
Urbanization
Solution
Sustainable agriculture practices help in conserving biodiversity by maintaining healthy ecosystems.
Correct Answer:
C
— Sustainable agriculture
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Q. Which of the following practices can help in conserving water in an ecosystem? (2022)
-
A.
Overgrazing
-
B.
Rainwater harvesting
-
C.
Deforestation
-
D.
Pollution
Solution
Rainwater harvesting is a practice that helps conserve water and can support ecosystems by maintaining water levels.
Correct Answer:
B
— Rainwater harvesting
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Q. Which of the following practices can help reduce soil erosion? (2022)
-
A.
Overgrazing
-
B.
Crop rotation
-
C.
Deforestation
-
D.
Urbanization
Solution
Crop rotation helps maintain soil health and reduces soil erosion by preventing nutrient depletion.
Correct Answer:
B
— Crop rotation
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Q. Which of the following practices can lead to habitat fragmentation? (2021)
-
A.
Urban development
-
B.
Reforestation
-
C.
Sustainable agriculture
-
D.
Wildlife corridors
Solution
Urban development can lead to habitat fragmentation by dividing ecosystems into smaller, isolated patches.
Correct Answer:
A
— Urban development
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Q. Which of the following processes can lead to speciation? (1990)
-
A.
Geographic isolation
-
B.
Behavioral isolation
-
C.
Temporal isolation
-
D.
All of the above
Solution
Speciation can occur through various processes, including geographic, behavioral, and temporal isolation, leading to the formation of new species.
Correct Answer:
D
— All of the above
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Q. Which of the following processes has a negative ΔG?
-
A.
Melting of ice at 0°C.
-
B.
Freezing of water at 0°C.
-
C.
Dissolving salt in water.
-
D.
Sublimation of dry ice.
Solution
Dissolving salt in water is a spontaneous process at standard conditions, resulting in a negative ΔG.
Correct Answer:
C
— Dissolving salt in water.
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Q. Which of the following processes has a positive change in entropy? (2023)
-
A.
Freezing of water
-
B.
Condensation of steam
-
C.
Sublimation of dry ice
-
D.
Melting of ice
Solution
The melting of ice has a positive change in entropy as the solid structure becomes more disordered in the liquid state.
Correct Answer:
D
— Melting of ice
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Q. Which of the following processes has a positive ΔG?
-
A.
Combustion of fuels
-
B.
Dissolution of salts in water
-
C.
Photosynthesis
-
D.
Respiration
Solution
Photosynthesis is an endothermic process that requires energy, resulting in a positive ΔG.
Correct Answer:
C
— Photosynthesis
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Q. Which of the following processes increases the entropy of the system? (2022)
-
A.
Freezing of water
-
B.
Melting of ice
-
C.
Condensation of steam
-
D.
Compression of gas
Solution
The melting of ice increases the entropy of the system as it transitions from a solid to a liquid state, which has more disorder.
Correct Answer:
B
— Melting of ice
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Q. Which of the following processes involves a change from gas to liquid?
-
A.
Sublimation
-
B.
Condensation
-
C.
Evaporation
-
D.
Freezing
Solution
Condensation is the process where gas changes to liquid.
Correct Answer:
B
— Condensation
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Q. Which of the following processes involves a change in temperature?
-
A.
Isothermal process
-
B.
Adiabatic process
-
C.
Isobaric process
-
D.
Isochoric process
Solution
In an adiabatic process, the system does not exchange heat with its surroundings, leading to a change in temperature.
Correct Answer:
B
— Adiabatic process
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Q. Which of the following processes involves a change of state without a change in temperature? (2018)
-
A.
Heating
-
B.
Cooling
-
C.
Melting
-
D.
Boiling
Solution
Melting involves a change of state (solid to liquid) without a change in temperature.
Correct Answer:
C
— Melting
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Q. Which of the following processes involves the conversion of mRNA into a protein? (2022)
-
A.
Transcription
-
B.
Translation
-
C.
Replication
-
D.
Translocation
Solution
Translation is the process where mRNA is decoded to produce a protein.
Correct Answer:
B
— Translation
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Q. Which of the following processes involves the emission of a positron? (2019)
-
A.
Alpha decay
-
B.
Beta decay
-
C.
Gamma decay
-
D.
Neutron capture
Solution
Beta decay involves the emission of a positron, which is the antimatter counterpart of an electron.
Correct Answer:
B
— Beta decay
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Q. Which of the following processes involves the synthesis of proteins? (2022)
-
A.
Replication
-
B.
Transcription
-
C.
Translation
-
D.
Translocation
Solution
Translation is the process that involves the synthesis of proteins from mRNA.
Correct Answer:
C
— Translation
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Q. Which of the following processes involves the transfer of genetic material between bacteria? (2022)
-
A.
Transcription
-
B.
Translation
-
C.
Transformation
-
D.
Transduction
Solution
Transformation is the process by which bacteria take up foreign DNA from their environment.
Correct Answer:
C
— Transformation
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Q. Which of the following processes involves the transfer of heat through a fluid? (2021)
-
A.
Conduction
-
B.
Convection
-
C.
Radiation
-
D.
Insulation
Solution
Convection is the process that involves the transfer of heat through a fluid (liquid or gas) due to the movement of the fluid itself.
Correct Answer:
B
— Convection
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Q. Which of the following processes involves the transfer of heat through the movement of fluids? (2021)
-
A.
Conduction
-
B.
Convection
-
C.
Radiation
-
D.
Insulation
Solution
Convection involves the transfer of heat through the movement of fluids.
Correct Answer:
B
— Convection
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Q. Which of the following processes is adiabatic?
-
A.
Heating a gas in a closed container
-
B.
Compressing a gas without heat exchange
-
C.
Cooling a gas at constant pressure
-
D.
Evaporating water at room temperature
Solution
An adiabatic process is one in which no heat is exchanged with the surroundings, such as compressing a gas without heat exchange.
Correct Answer:
B
— Compressing a gas without heat exchange
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Q. Which of the following processes is an example of an adiabatic process?
-
A.
Heating water in a kettle
-
B.
Compressing a gas in a piston without heat exchange
-
C.
Melting ice at room temperature
-
D.
Boiling water
Solution
An adiabatic process is one in which no heat is exchanged with the surroundings, such as compressing a gas in a piston without heat exchange.
Correct Answer:
B
— Compressing a gas in a piston without heat exchange
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Q. Which of the following processes is an example of an isochoric process? (2023)
-
A.
Heating a gas in a closed container
-
B.
Compressing a gas in a piston
-
C.
Expanding a gas against a constant pressure
-
D.
Cooling a gas at constant pressure
Solution
An isochoric process is one where the volume remains constant, such as heating a gas in a closed container.
Correct Answer:
A
— Heating a gas in a closed container
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Q. Which of the following processes is an example of an isothermal process?
-
A.
Heating a gas in a closed container
-
B.
Compressing a gas without heat exchange
-
C.
Melting ice at 0°C
-
D.
Cooling a gas at constant pressure
Solution
Melting ice at 0°C is an isothermal process as the temperature remains constant during the phase change.
Correct Answer:
C
— Melting ice at 0°C
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Q. Which of the following processes is associated with a positive change in entropy?
-
A.
Condensation of steam
-
B.
Sublimation of dry ice
-
C.
Freezing of water
-
D.
Compression of gas
Solution
Sublimation of dry ice (solid CO2) to gas increases disorder, resulting in a positive change in entropy.
Correct Answer:
B
— Sublimation of dry ice
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Q. Which of the following processes is associated with an increase in entropy?
-
A.
Freezing of water
-
B.
Condensation of steam
-
C.
Sublimation of dry ice
-
D.
Melting of ice
Solution
Sublimation of dry ice (solid CO2) to gas increases entropy as the gas phase has higher disorder than the solid phase.
Correct Answer:
C
— Sublimation of dry ice
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Q. Which of the following processes is characterized by constant pressure?
-
A.
Isothermal
-
B.
Isochoric
-
C.
Isobaric
-
D.
Adiabatic
Solution
An isobaric process is characterized by constant pressure.
Correct Answer:
C
— Isobaric
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Q. Which of the following processes is directly influenced by auxins? (2021)
-
A.
Phototropism
-
B.
Photosynthesis
-
C.
Respiration
-
D.
Transpiration
Solution
Auxins are responsible for phototropism, the growth of plants towards light.
Correct Answer:
A
— Phototropism
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Q. Which of the following processes is endothermic and results in an increase in entropy?
-
A.
Dissolving salt in water
-
B.
Combustion of methane
-
C.
Condensation of steam
-
D.
Freezing of water
Solution
Dissolving salt in water is an endothermic process that increases the disorder of the system, thus increasing entropy.
Correct Answer:
A
— Dissolving salt in water
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