Major Competitive Exams
Q. Which of the following best describes the arrangement of particles in a solid?
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A.
Random and far apart
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B.
Close together and fixed in place
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C.
Close together but free to move
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D.
Random and close together
Solution
In solids, particles are closely packed and fixed in place, giving them a definite shape.
Correct Answer: B — Close together and fixed in place
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Q. Which of the following best describes the effect of a larger slit width on the diffraction pattern?
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A.
More pronounced diffraction
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B.
Less pronounced diffraction
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C.
No diffraction
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D.
Increased number of fringes
Solution
A larger slit width results in less pronounced diffraction, leading to a narrower central maximum.
Correct Answer: B — Less pronounced diffraction
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Q. Which of the following best describes the particles in a gas? (2015)
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A.
Tightly packed and vibrating
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B.
Close together and sliding past each other
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C.
Far apart and moving freely
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D.
Fixed in place
Solution
In gases, particles are far apart and move freely, allowing them to fill the container they are in.
Correct Answer: C — Far apart and moving freely
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Q. Which of the following best describes the process of adaptive radiation? (1959)
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A.
Rapid evolution of many species from a common ancestor
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B.
Evolution of similar traits in unrelated species
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C.
Gradual change in a species over time
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D.
Extinction of species due to environmental changes
Solution
Adaptive radiation refers to the rapid evolution of many species from a common ancestor, often in response to new environmental opportunities.
Correct Answer: A — Rapid evolution of many species from a common ancestor
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Q. Which of the following best describes the term 'angular width' of a diffraction maximum?
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A.
The distance between two adjacent maxima
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B.
The angle subtended by the maximum at the source
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C.
The width of the maximum on a screen
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D.
The angle between the first minimum and the central maximum
Solution
The angular width of a diffraction maximum is defined as the angle between the first minimum on either side of the central maximum.
Correct Answer: D — The angle between the first minimum and the central maximum
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Q. Which of the following best describes the term 'carrying capacity'? (2020)
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A.
The maximum population size that an environment can sustain
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B.
The minimum population size for survival
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C.
The average population size over time
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D.
The population size at which birth rates equal death rates
Solution
Carrying capacity refers to the maximum population size that an environment can sustainably support.
Correct Answer: A — The maximum population size that an environment can sustain
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Q. Which of the following best describes the term 'elastic limit'?
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A.
Maximum stress a material can withstand
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B.
Point of permanent deformation
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C.
Point of maximum strain
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D.
Point of fracture
Solution
The elastic limit is the maximum stress that a material can withstand without undergoing permanent deformation.
Correct Answer: A — Maximum stress a material can withstand
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Q. Which of the following best describes the term 'shear modulus'?
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A.
Ratio of shear stress to shear strain
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B.
Ratio of tensile stress to tensile strain
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C.
Ratio of compressive stress to compressive strain
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D.
Ratio of bulk stress to bulk strain
Solution
The shear modulus is defined as the ratio of shear stress to shear strain in a material.
Correct Answer: A — Ratio of shear stress to shear strain
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Q. Which of the following biomolecules is primarily responsible for genetic information? (2021)
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A.
Proteins
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B.
Carbohydrates
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C.
Nucleic acids
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D.
Lipids
Solution
Nucleic acids, such as DNA and RNA, carry genetic information.
Correct Answer: C — Nucleic acids
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Q. Which of the following biomolecules is primarily responsible for storing genetic information?
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A.
Proteins
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B.
Lipids
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C.
Carbohydrates
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D.
Nucleic acids
Solution
Nucleic acids, such as DNA and RNA, are responsible for storing and transmitting genetic information.
Correct Answer: D — Nucleic acids
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Q. Which of the following bonds is the strongest?
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A.
Single bond
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B.
Double bond
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C.
Triple bond
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D.
All are equal
Solution
Triple bonds are the strongest type of covalent bond due to the presence of three shared electron pairs.
Correct Answer: C — Triple bond
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Q. Which of the following carbohydrates is a disaccharide?
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A.
Maltose
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B.
Ribose
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C.
Cellulose
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D.
Glycogen
Solution
Maltose is a disaccharide formed from two glucose units.
Correct Answer: A — Maltose
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Q. Which of the following carbohydrates is a ketose?
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A.
Glucose
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B.
Fructose
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C.
Galactose
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D.
Mannose
Solution
Fructose is a ketose sugar, while glucose and galactose are aldoses.
Correct Answer: B — Fructose
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Q. Which of the following carbohydrates is a reducing sugar?
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A.
Fructose
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B.
Sucrose
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C.
Maltose
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D.
Cellulose
Solution
Maltose is a reducing sugar because it has a free aldehyde or ketone group, while sucrose does not.
Correct Answer: C — Maltose
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Q. Which of the following carbohydrates is not digestible by humans?
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A.
Starch
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B.
Glycogen
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C.
Cellulose
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D.
Maltose
Solution
Cellulose is not digestible by humans due to the lack of enzymes to break it down.
Correct Answer: C — Cellulose
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Q. Which of the following carboxylic acids has the highest boiling point? (2020)
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A.
Formic acid
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B.
Acetic acid
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C.
Propanoic acid
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D.
Butanoic acid
Solution
Butanoic acid has the highest boiling point due to its longer carbon chain and greater molecular weight.
Correct Answer: D — Butanoic acid
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Q. Which of the following carboxylic acids is a dicarboxylic acid?
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A.
Acetic acid
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B.
Oxalic acid
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C.
Formic acid
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D.
Butanoic acid
Solution
Oxalic acid is a dicarboxylic acid as it contains two carboxyl groups (-COOH).
Correct Answer: B — Oxalic acid
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Q. Which of the following carboxylic acids is a solid at room temperature?
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A.
Acetic acid
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B.
Formic acid
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C.
Stearic acid
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D.
Propanoic acid
Solution
Stearic acid is a long-chain fatty acid and is solid at room temperature.
Correct Answer: C — Stearic acid
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Q. Which of the following changes will increase the yield of products in an exothermic reaction at equilibrium?
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A.
Increase the temperature
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B.
Decrease the pressure
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C.
Increase the concentration of reactants
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D.
Add a catalyst
Solution
Increasing the concentration of reactants will shift the equilibrium position to the right, favoring the formation of products.
Correct Answer: C — Increase the concentration of reactants
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Q. Which of the following changes will NOT affect the position of equilibrium for the reaction: 2SO2(g) + O2(g) ⇌ 2SO3(g)?
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A.
Increasing the concentration of SO2
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B.
Decreasing the temperature
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C.
Adding a catalyst
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D.
Increasing the volume of the container
Solution
A catalyst speeds up the rate of both the forward and reverse reactions equally, thus it does not affect the position of equilibrium.
Correct Answer: C — Adding a catalyst
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Q. Which of the following changes will NOT affect the position of equilibrium in a chemical reaction?
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A.
Changing the concentration of reactants
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B.
Changing the temperature
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C.
Adding a catalyst
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D.
Changing the pressure
Solution
Adding a catalyst speeds up the rate of both the forward and reverse reactions equally, thus it does not affect the position of equilibrium.
Correct Answer: C — Adding a catalyst
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Q. Which of the following changes will NOT affect the position of equilibrium in a closed system?
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A.
Adding a catalyst
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B.
Changing the concentration of reactants
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C.
Changing the pressure
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D.
Changing the temperature
Solution
A catalyst speeds up the rate of both the forward and reverse reactions equally, thus it does not change the position of equilibrium.
Correct Answer: A — Adding a catalyst
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Q. Which of the following changes will NOT affect the position of equilibrium?
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A.
Adding a catalyst
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B.
Changing the concentration of reactants
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C.
Changing the temperature
-
D.
Changing the pressure
Solution
A catalyst speeds up the rate of reaching equilibrium but does not change the position of equilibrium or the equilibrium constant.
Correct Answer: A — Adding a catalyst
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Q. Which of the following changes will shift the equilibrium to the right for the reaction: N2(g) + 3H2(g) ⇌ 2NH3(g)?
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A.
Increase in pressure
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B.
Decrease in temperature
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C.
Increase in volume
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D.
Addition of NH3
Solution
Increasing pressure shifts the equilibrium to the side with fewer moles of gas, which is the right side in this case.
Correct Answer: A — Increase in pressure
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Q. Which of the following colligative properties is affected by the number of solute particles in a solution?
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A.
Vapor pressure lowering
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B.
Density
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C.
Color
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D.
Viscosity
Solution
Vapor pressure lowering is a colligative property that depends on the number of solute particles in a solution.
Correct Answer: A — Vapor pressure lowering
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Q. Which of the following colligative properties is used to determine molar mass?
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A.
Boiling point elevation
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B.
Freezing point depression
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C.
Osmotic pressure
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D.
All of the above
Solution
All of the listed colligative properties can be used to determine the molar mass of a solute.
Correct Answer: D — All of the above
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Q. Which of the following colligative properties is used to determine the molar mass of a solute?
-
A.
Vapor pressure lowering
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B.
Boiling point elevation
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C.
Freezing point depression
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D.
Osmotic pressure
Solution
Freezing point depression can be used to determine the molar mass of a solute by measuring the decrease in freezing point.
Correct Answer: C — Freezing point depression
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Q. Which of the following colors of light has the shortest wavelength?
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A.
Red
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B.
Green
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C.
Blue
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D.
Violet
Solution
Violet light has the shortest wavelength among the visible spectrum.
Correct Answer: D — Violet
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Q. Which of the following complexes exhibits geometrical isomerism?
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A.
[Co(NH3)3Cl3]
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B.
[Ni(CN)4]2-
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C.
[CuCl4]2-
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D.
[Fe(CO)6]
Solution
[Co(NH3)3Cl3] can exhibit geometrical isomerism due to the presence of different ligands in a square planar geometry.
Correct Answer: A — [Co(NH3)3Cl3]
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Q. Which of the following complexes exhibits geometrical isomerism? (2022) 2022
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A.
[CoCl2(NH3)4]+
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B.
[Ni(CO)4]
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C.
[CuCl2(NH3)2]
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D.
[Zn(NH3)4]2+
Solution
[CoCl2(NH3)4]+ can exhibit geometrical isomerism due to the different arrangements of ligands around the cobalt ion.
Correct Answer: A — [CoCl2(NH3)4]+
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