Q. Which process do plants use to convert sunlight into energy? (2022)
A.
Cellular respiration
B.
Photosynthesis
C.
Fermentation
D.
Transpiration
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Solution
Plants use photosynthesis to convert sunlight into chemical energy.
Correct Answer: B — Photosynthesis
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Q. Which process is primarily responsible for the movement of water in plants? (2020)
A.
Diffusion
B.
Osmosis
C.
Active transport
D.
Transpiration
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Solution
Transpiration creates a negative pressure in the leaves, which helps in the upward movement of water through the xylem.
Correct Answer: D — Transpiration
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Q. Which process is responsible for the movement of water across a semi-permeable membrane? (2020)
A.
Diffusion
B.
Osmosis
C.
Active transport
D.
Facilitated diffusion
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Solution
Osmosis is the process by which water moves across a semi-permeable membrane from an area of lower solute concentration to an area of higher solute concentration.
Correct Answer: B — Osmosis
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Q. Which process is responsible for the movement of water across a semipermeable membrane? (2020)
A.
Diffusion
B.
Osmosis
C.
Active transport
D.
Facilitated diffusion
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Solution
Osmosis is the process of movement of water across a semipermeable membrane.
Correct Answer: B — Osmosis
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Q. Which process is used by cells to obtain energy from glucose? (2022)
A.
Photosynthesis
B.
Fermentation
C.
Cellular respiration
D.
Transpiration
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Solution
Cells obtain energy from glucose through the process of cellular respiration.
Correct Answer: C — Cellular respiration
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Q. Which property of a material describes its ability to return to its original shape after deformation? (2023)
A.
Plasticity
B.
Elasticity
C.
Ductility
D.
Brittleness
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Solution
Elasticity is the property that allows a material to return to its original shape after deformation.
Correct Answer: B — Elasticity
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Q. Which property of fluids is defined as the resistance to flow?
A.
Density
B.
Viscosity
C.
Pressure
D.
Surface Tension
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Solution
Viscosity is the property of fluids that describes their resistance to flow.
Correct Answer: B — Viscosity
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Q. Which protein forms the thick filaments in muscle fibers? (2020)
A.
A. Actin
B.
B. Myosin
C.
C. Tropomyosin
D.
D. Troponin
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Solution
Myosin forms the thick filaments in muscle fibers and interacts with actin during contraction.
Correct Answer: B — B. Myosin
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Q. Which protein is primarily responsible for muscle contraction? (2019)
A.
Actin
B.
Myosin
C.
Tropomyosin
D.
Troponin
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Solution
Myosin is the primary protein that interacts with actin to facilitate muscle contraction.
Correct Answer: B — Myosin
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Q. Which quantum number describes the orientation of an orbital? (2020) 2020
A.
Principal quantum number
B.
Azimuthal quantum number
C.
Magnetic quantum number
D.
Spin quantum number
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Solution
The magnetic quantum number describes the orientation of an orbital.
Correct Answer: C — Magnetic quantum number
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Q. Which quantum number is not required to describe the electron in an atom? (2019)
A.
Principal quantum number
B.
Azimuthal quantum number
C.
Magnetic quantum number
D.
Color quantum number
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Solution
Color quantum number is not a valid quantum number for describing electrons in an atom.
Correct Answer: D — Color quantum number
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Q. Which reaction is characteristic of alcohols? (2020)
A.
Dehydration
B.
Hydrogenation
C.
Halogenation
D.
Oxidation
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Solution
Dehydration is a characteristic reaction of alcohols where they lose water to form alkenes.
Correct Answer: A — Dehydration
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Q. Which reaction is characteristic of carboxylic acids? (2021)
A.
Esterification
B.
Hydrogenation
C.
Halogenation
D.
Dehydration
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Solution
Esterification is a characteristic reaction of carboxylic acids, where they react with alcohols to form esters.
Correct Answer: A — Esterification
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Q. Which reaction is used to prepare amines from alkyl halides? (2020)
A.
Nitration
B.
Hydrogenation
C.
Nucleophilic substitution
D.
Electrophilic substitution
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Solution
Amines can be prepared from alkyl halides through nucleophilic substitution reactions where the amine acts as a nucleophile.
Correct Answer: C — Nucleophilic substitution
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Q. Which reaction is used to prepare amines from alkyl halides? (2020) 2020
A.
Hydrogenation
B.
Nucleophilic substitution
C.
Electrophilic substitution
D.
Dehydrohalogenation
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Solution
Amines can be prepared from alkyl halides through nucleophilic substitution reactions, where the halide is replaced by an amine group.
Correct Answer: B — Nucleophilic substitution
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Q. Which reaction is used to prepare carboxylic acids from alcohols? (2020)
A.
Oxidation
B.
Reduction
C.
Hydrolysis
D.
Dehydration
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Solution
Oxidation of alcohols leads to the formation of carboxylic acids.
Correct Answer: A — Oxidation
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Q. Which reaction is used to prepare primary amines from alkyl halides? (2022)
A.
Reduction
B.
Hydrolysis
C.
Nucleophilic substitution
D.
Dehydrohalogenation
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Solution
Primary amines can be prepared from alkyl halides through nucleophilic substitution reactions with ammonia.
Correct Answer: C — Nucleophilic substitution
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Q. Which reagent can be used to convert an alkyl halide to an alcohol?
A.
H2O
B.
NaOH
C.
KBr
D.
HCl
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Solution
NaOH can be used to convert an alkyl halide to an alcohol through nucleophilic substitution.
Correct Answer: B — NaOH
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Q. Which reagent is commonly used to test for the presence of phenols?
A.
Bromine water
B.
Sodium dichromate
C.
Fehling's solution
D.
Tollens' reagent
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Solution
Bromine water is used to test for phenols, as they will decolorize bromine water.
Correct Answer: A — Bromine water
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Q. Which reagent is used to convert an alcohol into an alkyl halide? (2022)
A.
PCl5
B.
NaBH4
C.
LiAlH4
D.
H2SO4
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Solution
PCl5 is commonly used to convert alcohols into alkyl halides through a substitution reaction.
Correct Answer: A — PCl5
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Q. Which reagent is used to convert an alcohol to an alkyl halide? (2023) 2023
A.
PCl5
B.
NaOH
C.
H2SO4
D.
KMnO4
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Solution
PCl5 is commonly used to convert alcohols to alkyl halides through a substitution reaction.
Correct Answer: A — PCl5
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Q. Which reagent is used to convert an amine to an amide? (2023)
A.
Acid chloride
B.
Alcohol
C.
Aldehyde
D.
Ketone
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Solution
An acid chloride is used to convert an amine to an amide through acylation.
Correct Answer: A — Acid chloride
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Q. Which respiratory process occurs in the alveoli? (2023)
A.
Inhalation
B.
Exhalation
C.
Gas exchange
D.
Ventilation
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Solution
Gas exchange occurs in the alveoli, where oxygen is absorbed into the blood and carbon dioxide is released from the blood.
Correct Answer: C — Gas exchange
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Q. Which scientist is known for the discovery of the structure of DNA? (2017)
A.
Gregor Mendel
B.
James Watson
C.
Francis Crick
D.
Both James Watson and Francis Crick
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Solution
James Watson and Francis Crick are credited with the discovery of the double helix structure of DNA.
Correct Answer: D — Both James Watson and Francis Crick
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Q. Which scientist is known for the theory of inheritance of acquired characteristics?
A.
Darwin
B.
Mendel
C.
Lamarck
D.
Wallace
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Solution
Jean-Baptiste Lamarck is known for proposing the theory of inheritance of acquired characteristics, which suggests that traits acquired during an organism's lifetime can be passed to offspring.
Correct Answer: C — Lamarck
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Q. Which scientist is known for the theory of punctuated equilibrium? (1972)
A.
Charles Darwin
B.
Stephen Jay Gould
C.
Jean-Baptiste Lamarck
D.
Gregor Mendel
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Solution
Stephen Jay Gould, along with Niles Eldredge, proposed the theory of punctuated equilibrium, which suggests that species remain relatively stable for long periods and then undergo rapid changes.
Correct Answer: B — Stephen Jay Gould
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Q. Which state of matter has a definite shape and volume? (2017)
A.
Solid
B.
Liquid
C.
Gas
D.
Plasma
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Solution
Solids have a definite shape and volume due to their closely packed particles.
Correct Answer: A — Solid
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Q. Which state of matter has the highest density under normal conditions? (2023)
A.
Gas
B.
Liquid
C.
Solid
D.
Plasma
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Solution
Solids generally have the highest density due to closely packed particles.
Correct Answer: C — Solid
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Q. Which state of matter has the highest kinetic energy?
A.
Solid
B.
Liquid
C.
Gas
D.
Plasma
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Solution
Plasma has the highest kinetic energy as it consists of ionized particles moving freely.
Correct Answer: D — Plasma
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Q. Which structure connects muscle to bone? (2022)
A.
Ligament
B.
Tendon
C.
Cartilage
D.
Fascia
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Solution
Tendons are the structures that connect muscles to bones, facilitating movement.
Correct Answer: B — Tendon
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