Q. Which of the following polymers is used in the manufacture of rubber? (2019)
-
A.
Polyethylene
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B.
Natural rubber
-
C.
Polystyrene
-
D.
Polyvinyl acetate
Solution
Natural rubber is a polymer made from the latex of rubber trees and is widely used in the manufacture of rubber products.
Correct Answer: B — Natural rubber
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Q. Which of the following polymers is used in the production of plastic bottles?
-
A.
Polyethylene terephthalate (PET)
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B.
Polystyrene
-
C.
Polyvinyl chloride (PVC)
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D.
Polypropylene
Solution
Polyethylene terephthalate (PET) is commonly used in the production of plastic bottles.
Correct Answer: A — Polyethylene terephthalate (PET)
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Q. Which of the following polymers is used in the production of rubber? (2019)
-
A.
Polyethylene
-
B.
Natural rubber
-
C.
Polystyrene
-
D.
Polyvinyl acetate
Solution
Natural rubber is a polymer made from the latex of rubber trees and is widely used in the production of rubber products.
Correct Answer: B — Natural rubber
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Q. Which of the following polymers is used in the production of synthetic rubber?
-
A.
Polyvinyl chloride
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B.
Polystyrene
-
C.
Polyisoprene
-
D.
Polyethylene
Solution
Polyisoprene is a key polymer used in the production of synthetic rubber.
Correct Answer: C — Polyisoprene
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Q. Which of the following polynomials is a perfect square?
-
A.
x^2 + 4x + 4
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B.
x^2 - 4
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C.
x^2 + 2x + 3
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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
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B.
2x^2 + 3x - 5
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C.
4x + 7
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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)
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A.
Deforestation
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B.
Overfishing
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C.
Sustainable tourism
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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
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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)
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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 processes has a negative ΔG?
-
A.
Melting of ice at 0°C.
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B.
Freezing of water at 0°C.
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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 ΔG?
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A.
Combustion of fuels
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B.
Dissolution of salts in water
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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)
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A.
Freezing of water
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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?
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A.
Isothermal process
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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)
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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)
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A.
Alpha decay
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B.
Beta decay
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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 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 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
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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?
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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 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
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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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Q. Which of the following processes is endothermic?
-
A.
Combustion of fuels
-
B.
Dissolving ammonium nitrate in water
-
C.
Respiration
-
D.
Condensation of steam
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
Solution
The combustion of methane is an exothermic process, releasing heat.
Correct Answer: C — Combustion of methane
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