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
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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
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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
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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
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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
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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
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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
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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
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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
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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 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
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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
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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
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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
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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
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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
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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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Q. Which of the following processes is endothermic?
A.
Combustion of fuels
B.
Dissolving ammonium nitrate in water
C.
Respiration
D.
Condensation of steam
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Solution
Dissolving ammonium nitrate in water absorbs heat, making it an endothermic process.
Correct Answer: B — Dissolving ammonium nitrate in water
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Q. Which of the following processes is exothermic?
A.
Melting of ice
B.
Dissolving ammonium nitrate in water
C.
Combustion of methane
D.
Evaporation of water
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Solution
The combustion of methane is an exothermic process, releasing heat.
Correct Answer: C — Combustion of methane
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Q. Which of the following processes is expected to have the largest increase in entropy?
A.
Dissolving salt in water
B.
Melting ice
C.
Boiling water
D.
Sublimation of solid iodine
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Solution
Sublimation of solid iodine to gas involves a phase change from solid to gas, which has a significant increase in disorder, thus the largest increase in entropy.
Correct Answer: D — Sublimation of solid iodine
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Q. Which of the following processes is expected to have the largest positive change in entropy?
A.
Dissolving salt in water
B.
Condensing steam
C.
Melting ice
D.
Combining hydrogen and oxygen gases
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Solution
Dissolving salt in water increases the number of particles in solution, leading to a significant increase in entropy.
Correct Answer: A — Dissolving salt in water
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Q. Which of the following processes is influenced by auxins? (2021)
A.
Phototropism
B.
Gravitropism
C.
Apical dominance
D.
All of the above
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Solution
Auxins influence various processes including phototropism, gravitropism, and apical dominance.
Correct Answer: D — All of the above
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Q. Which of the following processes is irreversible and leads to an increase in entropy?
A.
Reversible isothermal expansion
B.
Free expansion of gas
C.
Isothermal compression
D.
Adiabatic expansion
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Solution
Free expansion of gas is an irreversible process that leads to an increase in entropy as the gas expands into a vacuum.
Correct Answer: B — Free expansion of gas
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Q. Which of the following processes is irreversible? (2022)
A.
Isothermal expansion
B.
Adiabatic expansion
C.
Free expansion
D.
Isobaric process
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Solution
Free expansion is an irreversible process as it occurs without any external pressure acting on the gas.
Correct Answer: C — Free expansion
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Q. Which of the following processes is isochoric? (2023)
A.
Constant volume
B.
Constant pressure
C.
Constant temperature
D.
Adiabatic
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Solution
An isochoric process is one that occurs at constant volume.
Correct Answer: A — Constant volume
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Q. Which of the following processes is isothermal for an ideal gas?
A.
Heating at constant volume
B.
Cooling at constant pressure
C.
Expansion against a constant external pressure
D.
Expansion where temperature remains constant
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Solution
An isothermal process for an ideal gas is characterized by the condition that the temperature remains constant during the expansion or compression.
Correct Answer: D — Expansion where temperature remains constant
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Q. Which of the following processes is isothermal?
A.
Heating a gas in a closed container
B.
Compressing a gas without heat exchange
C.
Allowing a gas to expand slowly while maintaining constant temperature
D.
Cooling a gas in a closed container
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Solution
Allowing a gas to expand slowly while maintaining constant temperature is an isothermal process.
Correct Answer: C — Allowing a gas to expand slowly while maintaining constant temperature
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Q. Which of the following processes is not a thermodynamic process?
A.
Isothermal
B.
Adiabatic
C.
Isochoric
D.
Static
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Solution
A static process does not involve any change in state variables, hence it is not considered a thermodynamic process.
Correct Answer: D — Static
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Q. Which of the following processes is NOT directly influenced by auxins? (2021)
A.
Phototropism
B.
Gravitropism
C.
Apical dominance
D.
Photosynthesis
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Solution
Photosynthesis is not directly influenced by auxins; they mainly affect growth and development processes.
Correct Answer: D — Photosynthesis
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Q. Which of the following processes is not governed by the First Law of Thermodynamics?
A.
Isothermal expansion
B.
Adiabatic compression
C.
Isochoric heating
D.
None of the above
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Solution
All the listed processes are governed by the First Law of Thermodynamics, so the answer is 'None of the above'.
Correct Answer: D — None of the above
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Q. Which of the following processes is NOT influenced by auxins? (2021)
A.
Phototropism
B.
Gravitropism
C.
Apical dominance
D.
Fruit ripening
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Solution
Fruit ripening is primarily influenced by ethylene, not auxins.
Correct Answer: D — Fruit ripening
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Q. Which of the following processes is NOT influenced by plant hormones? (2021)
A.
Seed germination
B.
Fruit ripening
C.
Photosynthesis
D.
Flowering
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Solution
Photosynthesis is a biochemical process that is not directly influenced by plant hormones.
Correct Answer: C — Photosynthesis
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