Q. Which polymer is commonly used in the production of non-stick cookware? (2023)
A.
Polyethylene
B.
Polytetrafluoroethylene (PTFE)
C.
Polypropylene
D.
Polyvinyl chloride (PVC)
Show solution
Solution
Polytetrafluoroethylene (PTFE), commonly known as Teflon, is used in non-stick cookware due to its low friction properties.
Correct Answer: B — Polytetrafluoroethylene (PTFE)
Learn More →
Q. Which polymer is commonly used in the production of synthetic fibers? (2023)
A.
Polyethylene
B.
Nylon
C.
Polystyrene
D.
Polyvinyl acetate
Show solution
Solution
Nylon is a synthetic polymer widely used in the production of synthetic fibers for clothing and textiles.
Correct Answer: B — Nylon
Learn More →
Q. Which polymer is known for its high resistance to heat?
A.
Polyethylene
B.
Teflon
C.
Polypropylene
D.
PVC
Show solution
Solution
Teflon (PTFE) is known for its high heat resistance and non-stick properties.
Correct Answer: B — Teflon
Learn More →
Q. Which principle states that the pressure in a fluid decreases as the fluid's velocity increases? (2022)
A.
Bernoulli's Principle
B.
Archimedes' Principle
C.
Pascal's Principle
D.
Hydrostatic Principle
Show solution
Solution
Bernoulli's Principle states that an increase in the speed of a fluid occurs simultaneously with a decrease in pressure.
Correct Answer: A — Bernoulli's Principle
Learn More →
Q. Which process do plants use to convert sunlight into energy? (2022)
A.
Cellular respiration
B.
Photosynthesis
C.
Fermentation
D.
Transpiration
Show solution
Solution
Plants use photosynthesis to convert sunlight into chemical energy.
Correct Answer: B — Photosynthesis
Learn More →
Q. Which process is primarily responsible for the movement of water in plants? (2020)
A.
Diffusion
B.
Osmosis
C.
Active transport
D.
Transpiration
Show solution
Solution
Transpiration creates a negative pressure in the leaves, which helps in the upward movement of water through the xylem.
Correct Answer: D — Transpiration
Learn More →
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
Show solution
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
Learn More →
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
Show solution
Solution
Osmosis is the process of movement of water across a semipermeable membrane.
Correct Answer: B — Osmosis
Learn More →
Q. Which process is used by cells to obtain energy from glucose? (2022)
A.
Photosynthesis
B.
Fermentation
C.
Cellular respiration
D.
Transpiration
Show solution
Solution
Cells obtain energy from glucose through the process of cellular respiration.
Correct Answer: C — Cellular respiration
Learn More →
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
Show solution
Solution
Elasticity is the property that allows a material to return to its original shape after deformation.
Correct Answer: B — Elasticity
Learn More →
Q. Which property of fluids is defined as the resistance to flow?
A.
Density
B.
Viscosity
C.
Pressure
D.
Surface Tension
Show solution
Solution
Viscosity is the property of fluids that describes their resistance to flow.
Correct Answer: B — Viscosity
Learn More →
Q. Which protein forms the thick filaments in muscle fibers? (2020)
A.
A. Actin
B.
B. Myosin
C.
C. Tropomyosin
D.
D. Troponin
Show solution
Solution
Myosin forms the thick filaments in muscle fibers and interacts with actin during contraction.
Correct Answer: B — B. Myosin
Learn More →
Q. Which protein is primarily responsible for muscle contraction? (2019)
A.
Actin
B.
Myosin
C.
Tropomyosin
D.
Troponin
Show solution
Solution
Myosin is the primary protein that interacts with actin to facilitate muscle contraction.
Correct Answer: B — Myosin
Learn More →
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
Show solution
Solution
The magnetic quantum number describes the orientation of an orbital.
Correct Answer: C — Magnetic quantum number
Learn More →
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
Show solution
Solution
Color quantum number is not a valid quantum number for describing electrons in an atom.
Correct Answer: D — Color quantum number
Learn More →
Q. Which reaction is characteristic of alcohols? (2020)
A.
Dehydration
B.
Hydrogenation
C.
Halogenation
D.
Oxidation
Show solution
Solution
Dehydration is a characteristic reaction of alcohols where they lose water to form alkenes.
Correct Answer: A — Dehydration
Learn More →
Q. Which reaction is characteristic of carboxylic acids? (2021)
A.
Esterification
B.
Hydrogenation
C.
Halogenation
D.
Dehydration
Show solution
Solution
Esterification is a characteristic reaction of carboxylic acids, where they react with alcohols to form esters.
Correct Answer: A — Esterification
Learn More →
Q. Which reaction is used to prepare amines from alkyl halides? (2020)
A.
Nitration
B.
Hydrogenation
C.
Nucleophilic substitution
D.
Electrophilic substitution
Show solution
Solution
Amines can be prepared from alkyl halides through nucleophilic substitution reactions where the amine acts as a nucleophile.
Correct Answer: C — Nucleophilic substitution
Learn More →
Q. Which reaction is used to prepare amines from alkyl halides? (2020) 2020
A.
Hydrogenation
B.
Nucleophilic substitution
C.
Electrophilic substitution
D.
Dehydrohalogenation
Show solution
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
Learn More →
Q. Which reaction is used to prepare amines from nitriles? (2020)
A.
Hydrogenation
B.
Reduction
C.
Alkylation
D.
Dehydration
Show solution
Solution
Nitriles can be converted to amines through reduction, typically using hydrogen in the presence of a catalyst.
Correct Answer: B — Reduction
Learn More →
Q. Which reaction is used to prepare carboxylic acids from alcohols? (2020)
A.
Oxidation
B.
Reduction
C.
Hydrolysis
D.
Dehydration
Show solution
Solution
Oxidation of alcohols leads to the formation of carboxylic acids.
Correct Answer: A — Oxidation
Learn More →
Q. Which reaction is used to prepare primary amines from alkyl halides? (2022)
A.
Reduction
B.
Hydrolysis
C.
Nucleophilic substitution
D.
Dehydrohalogenation
Show solution
Solution
Primary amines can be prepared from alkyl halides through nucleophilic substitution reactions with ammonia.
Correct Answer: C — Nucleophilic substitution
Learn More →
Q. Which reagent can be used to convert an alkyl halide to an alcohol?
A.
H2O
B.
NaOH
C.
KBr
D.
HCl
Show solution
Solution
NaOH can be used to convert an alkyl halide to an alcohol through nucleophilic substitution.
Correct Answer: B — NaOH
Learn More →
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
Show solution
Solution
Bromine water is used to test for phenols, as they will decolorize bromine water.
Correct Answer: A — Bromine water
Learn More →
Q. Which reagent is used to convert an alcohol into an alkyl halide? (2022)
A.
PCl5
B.
NaBH4
C.
LiAlH4
D.
H2SO4
Show solution
Solution
PCl5 is commonly used to convert alcohols into alkyl halides through a substitution reaction.
Correct Answer: A — PCl5
Learn More →
Q. Which reagent is used to convert an alcohol to an alkyl halide? (2023) 2023
A.
PCl5
B.
NaOH
C.
H2SO4
D.
KMnO4
Show solution
Solution
PCl5 is commonly used to convert alcohols to alkyl halides through a substitution reaction.
Correct Answer: A — PCl5
Learn More →
Q. Which reagent is used to convert an amine to an amide? (2023)
A.
Acid chloride
B.
Alcohol
C.
Aldehyde
D.
Ketone
Show solution
Solution
An acid chloride is used to convert an amine to an amide through acylation.
Correct Answer: A — Acid chloride
Learn More →
Q. Which respiratory process occurs in the alveoli? (2023)
A.
Inhalation
B.
Exhalation
C.
Gas exchange
D.
Ventilation
Show solution
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
Learn More →
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
Show solution
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
Learn More →
Q. Which scientist is known for the double helix model of DNA? (2017)
A.
Gregor Mendel
B.
James Watson
C.
Francis Crick
D.
Rosalind Franklin
Show solution
Solution
James Watson, along with Francis Crick, is credited with the discovery of the double helix structure of DNA.
Correct Answer: B — James Watson
Learn More →
Showing 5161 to 5190 of 5290 (177 Pages)