Q. Which of the following statements about aromatic amines is true?
A.
They are more basic than aliphatic amines
B.
They are less basic than aliphatic amines
C.
They do not react with acids
D.
They are neutral compounds
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Solution
Aromatic amines are less basic than aliphatic amines due to resonance stabilization of the lone pair on nitrogen.
Correct Answer: B — They are less basic than aliphatic amines
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Q. Which of the following statements about aromatic compounds is true?
A.
They are always colorless
B.
They have a sweet smell
C.
They are non-toxic
D.
They can be carcinogenic
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Solution
Many aromatic compounds can be carcinogenic, such as benzene, which is known to be harmful to human health.
Correct Answer: D — They can be carcinogenic
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Q. Which of the following statements about base systems is incorrect? (2023)
A.
Base 2 is used in digital electronics.
B.
Base 10 is the most widely used numeral system.
C.
Base 16 can represent more values than base 10.
D.
Base 8 is more efficient than base 2.
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Solution
Base 8 (octal) is not more efficient than base 2 (binary); it simply represents values in a different way.
Correct Answer: D — Base 8 is more efficient than base 2.
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Q. Which of the following statements about buoyancy is true?
A.
Buoyant force acts downward
B.
Buoyant force is equal to the weight of the fluid displaced
C.
Buoyant force depends on the shape of the object
D.
Buoyant force is always equal to the weight of the object
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Solution
The buoyant force acting on an object submerged in a fluid is equal to the weight of the fluid displaced by the object.
Correct Answer: B — Buoyant force is equal to the weight of the fluid displaced
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Q. Which of the following statements about carboxylic acids is incorrect? (2020)
A.
They can form hydrogen bonds.
B.
They have higher boiling points than alcohols.
C.
They are less acidic than alcohols.
D.
They can be converted to esters.
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Solution
Carboxylic acids are more acidic than alcohols due to the resonance stabilization of their conjugate base, making the statement 'They are less acidic than alcohols' incorrect.
Correct Answer: C — They are less acidic than alcohols.
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Q. Which of the following statements about carboxylic acids is true?
A.
They are always soluble in water
B.
They have higher boiling points than alcohols
C.
They can form hydrogen bonds
D.
All of the above
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Solution
Carboxylic acids can form hydrogen bonds due to the presence of the -COOH group, which contributes to their higher boiling points compared to hydrocarbons.
Correct Answer: C — They can form hydrogen bonds
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Q. Which of the following statements about catalysts is true?
A.
They are consumed in the reaction
B.
They increase the activation energy
C.
They provide an alternative reaction pathway
D.
They change the equilibrium constant
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Solution
Catalysts provide an alternative reaction pathway with a lower activation energy, but they are not consumed in the reaction.
Correct Answer: C — They provide an alternative reaction pathway
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Q. Which of the following statements about chemisorption is true? (2022)
A.
It is a reversible process
B.
It involves the formation of strong chemical bonds
C.
It occurs at low temperatures
D.
It is independent of the nature of the adsorbate
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Solution
Chemisorption involves the formation of strong chemical bonds between the adsorbate and the surface, making it generally irreversible.
Correct Answer: B — It involves the formation of strong chemical bonds
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Q. Which of the following statements about circularly polarized light is true?
A.
It has no preferred direction of oscillation
B.
It oscillates in a single plane
C.
It can be converted to linearly polarized light
D.
It is always produced by reflection
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Solution
Circularly polarized light has no preferred direction of oscillation; the electric field vector rotates in a circular motion.
Correct Answer: A — It has no preferred direction of oscillation
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Q. Which of the following statements about colligative properties is true?
A.
They depend on the identity of the solute
B.
They depend on the number of solute particles
C.
They are independent of temperature
D.
They are only applicable to ionic compounds
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Solution
Colligative properties depend on the number of solute particles in a solution, not their identity.
Correct Answer: B — They depend on the number of solute particles
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Q. Which of the following statements about constraint-based sets is correct?
A.
All elements in a constraint-based set must be unique.
B.
Constraints can be both inclusive and exclusive.
C.
Constraints do not affect the size of the set.
D.
All elements must be integers.
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Solution
Constraints can be both inclusive (allowing certain elements) and exclusive (disallowing others), affecting the composition of the set.
Correct Answer: B — Constraints can be both inclusive and exclusive.
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Q. Which of the following statements about constraint-based sets is true?
A.
All constraints are equal in importance.
B.
Constraints can be hierarchical.
C.
Constraints do not affect the outcome.
D.
Constraints are always numerical.
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Solution
Constraints can be hierarchical, meaning some constraints may take precedence over others in determining set membership.
Correct Answer: B — Constraints can be hierarchical.
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Q. Which of the following statements about constraints in set theory is FALSE?
A.
Constraints can be both inclusive and exclusive.
B.
Constraints can change the nature of the set.
C.
All constraints must be numerical.
D.
Constraints help in defining subsets.
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Solution
The statement that 'all constraints must be numerical' is false; constraints can be based on various properties, not just numerical.
Correct Answer: C — All constraints must be numerical.
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Q. Which of the following statements about coordination compounds is incorrect? (2023)
A.
They can exhibit geometric isomerism.
B.
They can exhibit optical isomerism.
C.
All coordination compounds are colored.
D.
They can form complexes with transition metals.
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Solution
Not all coordination compounds are colored; the color depends on the nature of the metal and the ligands involved. Some coordination compounds can be colorless.
Correct Answer: C — All coordination compounds are colored.
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Q. Which of the following statements about diffraction gratings is true?
A.
They can only produce first-order maxima
B.
They can produce multiple orders of maxima
C.
They do not produce any maxima
D.
They only work with monochromatic light
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Solution
Diffraction gratings can produce multiple orders of maxima due to the constructive interference of light waves.
Correct Answer: B — They can produce multiple orders of maxima
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Q. Which of the following statements about diffraction is true?
A.
Diffraction can occur with any type of wave
B.
Diffraction only occurs with sound waves
C.
Diffraction is only observed in light waves
D.
Diffraction is a phenomenon exclusive to electromagnetic waves
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Solution
Diffraction can occur with any type of wave, including sound, light, and water waves.
Correct Answer: A — Diffraction can occur with any type of wave
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Q. Which of the following statements about dynamic equilibrium is true?
A.
The concentrations of reactants and products are equal
B.
The rate of the forward reaction equals the rate of the reverse reaction
C.
The reaction has stopped
D.
The system is at rest
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Solution
In dynamic equilibrium, the rates of the forward and reverse reactions are equal, but the concentrations of reactants and products may not be equal.
Correct Answer: B — The rate of the forward reaction equals the rate of the reverse reaction
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Q. Which of the following statements about elastic potential energy stored in a stretched wire is true?
A.
It is proportional to the square of the extension
B.
It is proportional to the extension
C.
It is independent of the material
D.
It is always constant
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Solution
The elastic potential energy stored in a stretched wire is given by U = (1/2) * F * x, which is proportional to the square of the extension.
Correct Answer: A — It is proportional to the square of the extension
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Q. Which of the following statements about electric field lines is true?
A.
They can cross each other
B.
They are always straight
C.
They point from positive to negative charges
D.
They are always circular
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Solution
Electric field lines point from positive to negative charges, indicating the direction of the electric field.
Correct Answer: C — They point from positive to negative charges
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Q. Which of the following statements about electromagnetic waves is true?
A.
They require a medium to propagate
B.
They travel at the speed of sound
C.
They are transverse waves
D.
They are longitudinal waves
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Solution
Electromagnetic waves are transverse waves that do not require a medium to propagate and travel at the speed of light in a vacuum.
Correct Answer: C — They are transverse waves
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Q. Which of the following statements about electrons is true?
A.
They have a positive charge
B.
They are found in the nucleus
C.
They have a negligible mass
D.
They are stationary
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Solution
Electrons have a negligible mass compared to protons and neutrons.
Correct Answer: C — They have a negligible mass
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Q. Which of the following statements about enthalpy is true?
A.
Enthalpy is an extensive property.
B.
Enthalpy is an intensive property.
C.
Enthalpy cannot be measured directly.
D.
Enthalpy is always positive.
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Solution
Enthalpy is an extensive property, meaning it depends on the amount of substance present.
Correct Answer: A — Enthalpy is an extensive property.
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Q. Which of the following statements about entropy is true?
A.
Entropy is a measure of disorder.
B.
Entropy decreases in spontaneous processes.
C.
Entropy is always constant.
D.
Entropy cannot be calculated.
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Solution
Entropy is a measure of disorder in a system.
Correct Answer: A — Entropy is a measure of disorder.
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Q. Which of the following statements about equilibrium constants is true?
A.
K is temperature dependent
B.
K is pressure dependent
C.
K is concentration dependent
D.
K is always equal to 1
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Solution
The equilibrium constant K is dependent on temperature; changing the temperature will change the value of K.
Correct Answer: A — K is temperature dependent
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Q. Which of the following statements about ethers is true?
A.
Ethers are more polar than alcohols
B.
Ethers have higher boiling points than alcohols
C.
Ethers are less reactive than alcohols
D.
Ethers can form hydrogen bonds with water
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Solution
Ethers are generally less reactive than alcohols due to the absence of a hydroxyl group.
Correct Answer: C — Ethers are less reactive than alcohols
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Q. Which of the following statements about evolution is true? (2000)
A.
Evolution is a linear process.
B.
Evolution can occur in response to environmental changes.
C.
All traits are adaptive.
D.
Evolution results in perfect organisms.
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Solution
Evolution can occur in response to environmental changes, allowing species to adapt to new conditions over time.
Correct Answer: B — Evolution can occur in response to environmental changes.
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Q. Which of the following statements about exponents is false?
A.
a^m * a^n = a^(m+n)
B.
a^m / a^n = a^(m-n)
C.
a^0 = 0
D.
a^(-n) = 1/a^n
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Solution
The statement a^0 = 0 is false; in fact, a^0 = 1 for any non-zero a.
Correct Answer: C — a^0 = 0
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Q. Which of the following statements about exponents is incorrect?
A.
a^(m+n) = a^m * a^n
B.
a^(m-n) = a^m / a^n
C.
a^m * b^m = (ab)^m
D.
a^m + a^n = a^(m+n)
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Solution
The statement a^m + a^n = a^(m+n) is incorrect; addition of exponents does not apply in this manner.
Correct Answer: D — a^m + a^n = a^(m+n)
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Q. Which of the following statements about factors is incorrect?
A.
Every number has at least two factors.
B.
Factors can be negative.
C.
The number itself is always a factor.
D.
Factors of a prime number are only 1 and the number itself.
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Solution
Every number has at least two factors: 1 and the number itself, but some numbers can have more than two factors.
Correct Answer: A — Every number has at least two factors.
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Q. Which of the following statements about fluids is true?
A.
Fluids can only flow in one direction
B.
Fluids have a definite shape
C.
Fluids can exert pressure in all directions
D.
Fluids are incompressible
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Solution
Fluids can exert pressure in all directions, which is a fundamental property of fluids.
Correct Answer: C — Fluids can exert pressure in all directions
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