Q. Which of the following statements about ideal solutions is true?
A.
They obey Raoult's law at all concentrations
B.
They have a constant boiling point
C.
They have a constant density
D.
They do not exhibit colligative properties
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Solution
Ideal solutions obey Raoult's law at all concentrations, meaning their vapor pressures are proportional to the mole fractions.
Correct Answer: A — They obey Raoult's law at all concentrations
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Q. Which of the following statements about inductive effect is correct?
A.
It is a permanent effect
B.
It is a temporary effect
C.
It only affects alkenes
D.
It increases basicity
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Solution
Inductive effect is a permanent effect due to the electronegativity of atoms or groups.
Correct Answer: A — It is a permanent effect
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Q. Which of the following statements about isomerism is FALSE?
A.
Isomers have the same molecular formula.
B.
Isomers have different physical properties.
C.
Isomers have different chemical properties.
D.
Isomers cannot exist in the same physical state.
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Solution
Isomers can exist in the same physical state, such as liquid or solid.
Correct Answer: D — Isomers cannot exist in the same physical state.
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Q. Which of the following statements about isomerism is true?
A.
Isomers have the same molecular formula
B.
Isomers have different molecular formulas
C.
Isomers have the same physical properties
D.
Isomers cannot exist in the same compound
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Solution
Isomers have the same molecular formula but differ in the arrangement of atoms.
Correct Answer: A — Isomers have the same molecular formula
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Q. Which of the following statements about isomers is true?
A.
Isomers have different molecular formulas
B.
Isomers have the same connectivity of atoms
C.
Isomers have different physical and chemical properties
D.
Isomers cannot exist in the same compound
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Solution
Isomers can have different physical and chemical properties despite having the same molecular formula.
Correct Answer: C — Isomers have different physical and chemical properties
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Q. Which of the following statements about isotopes is true?
A.
Isotopes have the same number of protons
B.
Isotopes have different chemical properties
C.
Isotopes have different numbers of protons
D.
Isotopes are always radioactive
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Solution
Isotopes are atoms of the same element with the same number of protons but different numbers of neutrons.
Correct Answer: A — Isotopes have the same number of protons
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Q. Which of the following statements about kinetic friction is true?
A.
It is always greater than static friction.
B.
It depends on the speed of the object.
C.
It is independent of the contact area.
D.
It increases with increasing normal force.
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Solution
Kinetic friction is independent of the contact area and depends only on the normal force and the coefficient of kinetic friction.
Correct Answer: C — It is independent of the contact area.
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Q. Which of the following statements about lenses is true?
A.
Concave lenses converge light rays
B.
Convex lenses diverge light rays
C.
Concave lenses produce virtual images
D.
Convex lenses have negative focal lengths
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Solution
Concave lenses always produce virtual images when the object is placed within the focal length.
Correct Answer: C — Concave lenses produce virtual images
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Q. Which of the following statements about liquids is true?
A.
They have a definite shape.
B.
They are incompressible.
C.
They have a fixed volume.
D.
Both B and C
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Solution
Liquids are incompressible and have a fixed volume, but they do not have a definite shape.
Correct Answer: D — Both B and C
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Q. Which of the following statements about magnetic field lines is true?
A.
They can cross each other
B.
They are always straight lines
C.
They form closed loops
D.
They originate from magnetic monopoles
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Solution
Magnetic field lines always form closed loops, indicating that magnetic field lines do not start or end but continue indefinitely.
Correct Answer: C — They form closed loops
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Q. Which of the following statements about mesomeric effect is true?
A.
It involves only sigma bonds.
B.
It is a permanent effect.
C.
It is weaker than the inductive effect.
D.
It does not involve resonance structures.
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Solution
The mesomeric effect is a permanent effect that involves the delocalization of electrons through pi bonds and resonance structures.
Correct Answer: B — It is a permanent effect.
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Q. Which of the following statements about metallic bonding is true?
A.
Electrons are localized
B.
Electrons are delocalized
C.
Only positive ions are present
D.
It involves sharing of electrons
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Solution
In metallic bonding, electrons are delocalized, allowing for conductivity and malleability.
Correct Answer: B — Electrons are delocalized
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Q. Which of the following statements about molarity is true?
A.
It changes with temperature.
B.
It is independent of temperature.
C.
It is defined as moles of solute per liter of solvent.
D.
It is always equal to molality.
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Solution
Molarity is defined as moles of solute per liter of solution, and it can change with temperature due to volume changes.
Correct Answer: A — It changes with temperature.
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Q. Which of the following statements about molecular orbitals is correct?
A.
Molecular orbitals are formed by the overlap of atomic orbitals.
B.
Molecular orbitals can only be occupied by one electron.
C.
Bonding molecular orbitals have higher energy than antibonding orbitals.
D.
Molecular orbitals do not influence the shape of molecules.
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Solution
Molecular orbitals are indeed formed by the overlap of atomic orbitals.
Correct Answer: A — Molecular orbitals are formed by the overlap of atomic orbitals.
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Q. Which of the following statements about molecular orbitals is incorrect?
A.
Molecular orbitals can be occupied by a maximum of two electrons.
B.
Bonding orbitals are lower in energy than antibonding orbitals.
C.
Molecular orbitals are formed from the linear combination of atomic orbitals.
D.
All molecular orbitals are degenerate.
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Solution
Not all molecular orbitals are degenerate; some can have different energy levels.
Correct Answer: D — All molecular orbitals are degenerate.
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Q. Which of the following statements about molecular orbitals is true?
A.
Molecular orbitals are formed by the overlap of atomic orbitals.
B.
Molecular orbitals can only be occupied by one electron.
C.
Molecular orbitals do not have any energy levels.
D.
Molecular orbitals are only found in diatomic molecules.
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Solution
Molecular orbitals are indeed formed by the overlap of atomic orbitals.
Correct Answer: A — Molecular orbitals are formed by the overlap of atomic orbitals.
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Q. Which of the following statements about multiples is true?
A.
The multiples of a number are infinite.
B.
The multiples of a number are always positive.
C.
The first multiple of any number is the number itself.
D.
All of the above.
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Solution
All statements are true regarding multiples.
Correct Answer: D — All of the above.
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Q. Which of the following statements about number systems is true?
A.
Base-10 is the only positional system
B.
Base-2 can represent all integers
C.
Base-16 is less efficient than base-10
D.
Base-5 cannot represent fractions
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Solution
Base-2 can represent all integers, as it is a complete positional system.
Correct Answer: B — Base-2 can represent all integers
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Q. Which of the following statements about numeral systems is correct?
A.
All numeral systems are based on the same principles.
B.
Different numeral systems can represent the same value.
C.
The decimal system is the only system used in mathematics.
D.
Base systems are irrelevant in modern computing.
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Solution
Different numeral systems can represent the same value, such as the decimal 10 and binary 1010.
Correct Answer: B — Different numeral systems can represent the same value.
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Q. Which of the following statements about optical isomers is true?
A.
They have the same physical properties
B.
They rotate plane-polarized light in opposite directions
C.
They have different molecular formulas
D.
They are always chiral
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Solution
Optical isomers, or enantiomers, rotate plane-polarized light in opposite directions.
Correct Answer: B — They rotate plane-polarized light in opposite directions
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Q. Which of the following statements about parthenogenesis is true? (2020)
A.
It involves fertilization
B.
It is a form of sexual reproduction
C.
It produces offspring from unfertilized eggs
D.
It is common in mammals
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Solution
Parthenogenesis is a form of asexual reproduction where offspring develop from unfertilized eggs.
Correct Answer: C — It produces offspring from unfertilized eggs
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Q. Which of the following statements about partnerships is true?
A.
All partners must have equal say in decisions
B.
Partnerships are always limited liability
C.
Partners can be held personally liable for business debts
D.
Partnerships cannot have more than two partners
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Solution
In a general partnership, partners can be held personally liable for the debts of the business.
Correct Answer: C — Partners can be held personally liable for business debts
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Q. Which of the following statements about phenols is true?
A.
They are weak acids.
B.
They are strong bases.
C.
They do not react with bromine.
D.
They are insoluble in water.
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Solution
Phenols are weak acids due to the ability of the hydroxyl group to donate a proton.
Correct Answer: A — They are weak acids.
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Q. Which of the following statements about plasma is true? (2023)
A.
It has a definite shape and volume
B.
It is a good conductor of electricity
C.
It has low energy
D.
It is the most common state of matter in the universe
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Solution
Plasma is the most common state of matter in the universe, found in stars and interstellar space.
Correct Answer: D — It is the most common state of matter in the universe
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Q. Which of the following statements about polarized light is true?
A.
It can pass through any material without obstruction
B.
It vibrates in multiple planes
C.
It vibrates in a single plane
D.
It has a higher speed than unpolarized light
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Solution
Polarized light vibrates in a single plane, unlike unpolarized light which vibrates in multiple planes.
Correct Answer: C — It vibrates in a single plane
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Q. Which of the following statements about power is true?
A.
Power is always conserved
B.
Power can be negative
C.
Power is independent of time
D.
Power is a scalar quantity
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Solution
Power can be negative when work is done against the direction of motion, such as in friction. Therefore, the correct statement is that power can be negative.
Correct Answer: B — Power can be negative
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Q. Which of the following statements about prime numbers is true?
A.
Every even number greater than 2 is prime.
B.
Prime numbers can only be divided by 1 and themselves.
C.
The number 1 is considered a prime number.
D.
There are infinitely many even prime numbers.
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Solution
Prime numbers are defined as numbers greater than 1 that have no divisors other than 1 and themselves.
Correct Answer: B — Prime numbers can only be divided by 1 and themselves.
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Q. Which of the following statements about respiration in plants is true? (2022)
A.
It occurs only at night
B.
It is independent of photosynthesis
C.
It produces more energy than fermentation
D.
It only occurs in leaves
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Solution
Respiration in plants produces more energy than fermentation, as it fully oxidizes glucose in the presence of oxygen.
Correct Answer: C — It produces more energy than fermentation
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Q. Which of the following statements about RMS speed is true?
A.
RMS speed is always greater than average speed
B.
RMS speed is always less than average speed
C.
RMS speed equals average speed
D.
RMS speed is independent of molecular mass
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Solution
The RMS speed is always greater than the average speed for a distribution of speeds in a gas.
Correct Answer: A — RMS speed is always greater than average speed
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Q. Which of the following statements about solids is true?
A.
They have a definite shape and volume
B.
They flow easily
C.
They have low density
D.
They are incompressible
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Solution
Solids have a definite shape and volume due to the closely packed arrangement of their particles.
Correct Answer: A — They have a definite shape and volume
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