Q. Which of the following statements about electromagnetic waves is true?
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A.
They require a medium to propagate
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B.
They travel at the speed of sound
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C.
They are transverse waves
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D.
They are longitudinal waves
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?
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A.
They have a positive charge
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B.
They are found in the nucleus
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C.
They have a negligible mass
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D.
They are stationary
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?
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A.
Enthalpy is an extensive property.
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B.
Enthalpy is an intensive property.
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C.
Enthalpy cannot be measured directly.
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D.
Enthalpy is always positive.
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.
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B.
Entropy decreases in spontaneous processes.
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C.
Entropy is always constant.
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D.
Entropy cannot be calculated.
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?
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A.
K is temperature dependent
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B.
K is pressure dependent
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C.
K is concentration dependent
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D.
K is always equal to 1
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?
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A.
Ethers are more polar than alcohols
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B.
Ethers have higher boiling points than alcohols
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C.
Ethers are less reactive than alcohols
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D.
Ethers can form hydrogen bonds with water
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)
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A.
Evolution is a linear process.
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B.
Evolution can occur in response to environmental changes.
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C.
All traits are adaptive.
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D.
Evolution results in perfect organisms.
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?
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A.
a^m * a^n = a^(m+n)
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B.
a^m / a^n = a^(m-n)
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C.
a^0 = 0
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D.
a^(-n) = 1/a^n
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?
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A.
a^(m+n) = a^m * a^n
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B.
a^(m-n) = a^m / a^n
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C.
a^m * b^m = (ab)^m
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D.
a^m + a^n = a^(m+n)
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 and multiples is incorrect? (2023)
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A.
Every multiple of a number is greater than or equal to that number.
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B.
A number can have an infinite number of factors.
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C.
The product of two numbers is always a multiple of both.
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D.
A factor of a number is always greater than the number.
Solution
A factor of a number is always less than or equal to that number, making the last statement incorrect.
Correct Answer: D — A factor of a number is always greater than the number.
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Q. Which of the following statements about factors is incorrect?
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A.
Every number has at least two factors.
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B.
Factors can be negative.
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C.
The number itself is always a factor.
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D.
Factors of a prime number are only 1 and the number itself.
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
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B.
Fluids have a definite shape
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C.
Fluids can exert pressure in all directions
-
D.
Fluids are incompressible
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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Q. Which of the following statements about gases is true? (2022)
-
A.
Gases have a definite shape and volume
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B.
Gases are incompressible
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C.
Gases fill the entire volume of their container
-
D.
Gases have a fixed molecular arrangement
Solution
Gases fill the entire volume of their container due to the high kinetic energy of their particles, allowing them to spread out.
Correct Answer: C — Gases fill the entire volume of their container
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Q. Which of the following statements about geometric progressions is true?
-
A.
The ratio of consecutive terms is constant.
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B.
The sum of terms is always positive.
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C.
The first term must be greater than the second.
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D.
The common ratio can only be an integer.
Solution
In a geometric progression, the ratio of consecutive terms is indeed constant, which defines the progression.
Correct Answer: A — The ratio of consecutive terms is constant.
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Q. Which of the following statements about geostationary satellites is true?
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A.
They orbit the Earth in a polar orbit
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B.
They have a period of 24 hours
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C.
They are closer to the Earth than low Earth orbit satellites
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D.
They can be used for global positioning
Solution
Geostationary satellites have an orbital period equal to the Earth's rotation period, which is 24 hours.
Correct Answer: B — They have a period of 24 hours
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Q. Which of the following statements about gravitational potential energy (U) is true?
-
A.
U increases as two masses move closer together
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B.
U decreases as two masses move closer together
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C.
U is always positive
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D.
U is independent of distance
Solution
Gravitational potential energy decreases as two masses move closer together, as U = -G * (m1 * m2) / r.
Correct Answer: B — U decreases as two masses move closer together
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Q. Which of the following statements about gravitational potential energy is true?
-
A.
It is always positive.
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B.
It can be negative.
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C.
It is independent of the reference point.
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D.
It increases with distance.
Solution
Gravitational potential energy can be negative depending on the reference point chosen.
Correct Answer: B — It can be negative.
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Q. Which of the following statements about haloalkanes is true?
-
A.
They are polar compounds
-
B.
They are non-polar compounds
-
C.
They do not react with nucleophiles
-
D.
They are always solids
Solution
Haloalkanes are polar compounds due to the electronegativity difference between carbon and halogen.
Correct Answer: A — They are polar compounds
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Q. Which of the following statements about harmonic progression is false?
-
A.
The sum of the terms is finite
-
B.
The terms can be negative
-
C.
The terms can be zero
-
D.
The terms can be fractions
Solution
In a harmonic progression, terms cannot be zero as it would make the reciprocal undefined.
Correct Answer: C — The terms can be zero
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Q. Which of the following statements about harmonic progression is true?
-
A.
The sum of the terms is always positive.
-
B.
The terms can be negative.
-
C.
The terms are always integers.
-
D.
The common difference is always positive.
Solution
In a harmonic progression, the terms can be negative as long as their reciprocals form an arithmetic progression.
Correct Answer: B — The terms can be negative.
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Q. Which of the following statements about hybrid sets is true?
-
A.
Hybrid sets can only contain numerical elements.
-
B.
The union of two hybrid sets is always a hybrid set.
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C.
Hybrid sets cannot be empty.
-
D.
The intersection of two hybrid sets is always empty.
Solution
The union of two hybrid sets combines all unique elements from both sets, thus it remains a hybrid set.
Correct Answer: B — The union of two hybrid sets is always a hybrid set.
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Q. Which of the following statements about hydrogen is incorrect? (2019)
-
A.
Hydrogen is the lightest element.
-
B.
Hydrogen can form covalent bonds.
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C.
Hydrogen exists as a diatomic molecule in nature.
-
D.
Hydrogen is a metal at room temperature.
Solution
Hydrogen is a non-metal at room temperature and does not exhibit metallic properties.
Correct Answer: D — Hydrogen is a metal at room temperature.
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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
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
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.
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
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
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
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.
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
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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