Major Competitive Exams
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
Show solution
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
Learn More →
Q. Which of the following practices can help conserve biodiversity? (2021)
A.
Deforestation
B.
Overfishing
C.
Sustainable tourism
D.
Pollution
Show solution
Solution
Sustainable tourism can help conserve biodiversity by promoting responsible travel that does not harm ecosystems.
Correct Answer: C — Sustainable tourism
Learn More →
Q. Which of the following practices can help in conserving biodiversity? (2021)
A.
Monoculture farming
B.
Deforestation
C.
Sustainable agriculture
D.
Urbanization
Show solution
Solution
Sustainable agriculture practices help in conserving biodiversity by maintaining healthy ecosystems.
Correct Answer: C — Sustainable agriculture
Learn More →
Q. Which of the following practices can help in conserving water in an ecosystem? (2022)
A.
Overgrazing
B.
Rainwater harvesting
C.
Deforestation
D.
Pollution
Show solution
Solution
Rainwater harvesting is a practice that helps conserve water and can support ecosystems by maintaining water levels.
Correct Answer: B — Rainwater harvesting
Learn More →
Q. Which of the following practices can help reduce soil erosion? (2022)
A.
Overgrazing
B.
Crop rotation
C.
Deforestation
D.
Urbanization
Show solution
Solution
Crop rotation helps maintain soil health and reduces soil erosion by preventing nutrient depletion.
Correct Answer: B — Crop rotation
Learn More →
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.
Show solution
Solution
Dissolving salt in water is a spontaneous process at standard conditions, resulting in a negative ΔG.
Correct Answer: C — Dissolving salt in water.
Learn More →
Q. Which of the following processes has a positive ΔG?
A.
Combustion of fuels
B.
Dissolution of salts in water
C.
Photosynthesis
D.
Respiration
Show solution
Solution
Photosynthesis is an endothermic process that requires energy, resulting in a positive ΔG.
Correct Answer: C — Photosynthesis
Learn More →
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
Show solution
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
Learn More →
Q. Which of the following processes involves a change from gas to liquid?
A.
Sublimation
B.
Condensation
C.
Evaporation
D.
Freezing
Show solution
Solution
Condensation is the process where gas changes to liquid.
Correct Answer: B — Condensation
Learn More →
Q. Which of the following processes involves a change in temperature?
A.
Isothermal process
B.
Adiabatic process
C.
Isobaric process
D.
Isochoric process
Show solution
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
Learn More →
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
Show solution
Solution
Melting involves a change of state (solid to liquid) without a change in temperature.
Correct Answer: C — Melting
Learn More →
Q. Which of the following processes involves the conversion of mRNA into a protein? (2022)
A.
Transcription
B.
Translation
C.
Replication
D.
Translocation
Show solution
Solution
Translation is the process where mRNA is decoded to produce a protein.
Correct Answer: B — Translation
Learn More →
Q. Which of the following processes involves the transfer of genetic material between bacteria? (2022)
A.
Transcription
B.
Translation
C.
Transformation
D.
Transduction
Show solution
Solution
Transformation is the process by which bacteria take up foreign DNA from their environment.
Correct Answer: C — Transformation
Learn More →
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
Show solution
Solution
Convection involves the transfer of heat through the movement of fluids.
Correct Answer: B — Convection
Learn More →
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
Show solution
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
Learn More →
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
Show solution
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
Learn More →
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
Show solution
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
Learn More →
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
Show solution
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
Learn More →
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
Show solution
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
Learn More →
Q. Which of the following processes is characterized by constant pressure?
A.
Isothermal
B.
Isochoric
C.
Isobaric
D.
Adiabatic
Show solution
Solution
An isobaric process is characterized by constant pressure.
Correct Answer: C — Isobaric
Learn More →
Q. Which of the following processes is directly influenced by auxins? (2021)
A.
Phototropism
B.
Photosynthesis
C.
Respiration
D.
Transpiration
Show solution
Solution
Auxins are responsible for phototropism, the growth of plants towards light.
Correct Answer: A — Phototropism
Learn More →
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
Show solution
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
Learn More →
Q. Which of the following processes is endothermic?
A.
Combustion of fuels
B.
Dissolving ammonium nitrate in water
C.
Respiration
D.
Condensation of steam
Show solution
Solution
Dissolving ammonium nitrate in water absorbs heat, making it an endothermic process.
Correct Answer: B — Dissolving ammonium nitrate in water
Learn More →
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
Show solution
Solution
The combustion of methane is an exothermic process, releasing heat.
Correct Answer: C — Combustion of methane
Learn More →
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
Show solution
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
Learn More →
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
Show solution
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
Learn More →
Q. Which of the following processes is influenced by auxins? (2021)
A.
Phototropism
B.
Gravitropism
C.
Apical dominance
D.
All of the above
Show solution
Solution
Auxins influence various processes including phototropism, gravitropism, and apical dominance.
Correct Answer: D — All of the above
Learn More →
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
Show solution
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
Learn More →
Q. Which of the following processes is irreversible? (2022)
A.
Isothermal expansion
B.
Adiabatic expansion
C.
Free expansion
D.
Isobaric process
Show solution
Solution
Free expansion is an irreversible process as it occurs without any external pressure acting on the gas.
Correct Answer: C — Free expansion
Learn More →
Q. Which of the following processes is isochoric? (2023)
A.
Constant volume
B.
Constant pressure
C.
Constant temperature
D.
Adiabatic
Show solution
Solution
An isochoric process is one that occurs at constant volume.
Correct Answer: A — Constant volume
Learn More →
Showing 17551 to 17580 of 18756 (626 Pages)