Q. The rate of a reaction is directly proportional to the concentration of one reactant raised to the power of 2. What is the order of the reaction? (2022)
A.
Zero order
B.
First order
C.
Second order
D.
Third order
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Solution
If the rate is proportional to the concentration of one reactant raised to the power of 2, the reaction is second order.
Correct Answer: C — Second order
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Q. The rate of a reaction is directly proportional to the product of the concentrations of the reactants raised to their respective powers. This statement defines:
A.
Rate law
B.
Equilibrium constant
C.
Reaction quotient
D.
Catalytic efficiency
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Solution
This statement defines the rate law of a reaction.
Correct Answer: A — Rate law
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Q. The rate of a reaction is directly proportional to the product of the concentrations of the reactants raised to their respective powers. This statement defines which law?
A.
Law of conservation of mass
B.
Rate law
C.
Le Chatelier's principle
D.
Gibbs free energy
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Solution
This statement defines the rate law of a chemical reaction.
Correct Answer: B — Rate law
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Q. The rate of a reaction is given by the equation rate = k[A]^2[B]. What is the overall order of the reaction? (2020)
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Solution
The overall order of the reaction is 2 (from [A]^2) + 1 (from [B]) = 3.
Correct Answer: C — 3
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Q. The restoring force in a simple harmonic oscillator is directly proportional to what? (2022)
A.
Displacement
B.
Velocity
C.
Acceleration
D.
Mass
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Solution
The restoring force (F) is directly proportional to the displacement (x) and acts in the opposite direction, F = -kx.
Correct Answer: A — Displacement
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Q. The restoring force in simple harmonic motion is directly proportional to what? (2022)
A.
Displacement
B.
Velocity
C.
Acceleration
D.
Mass
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Solution
The restoring force (F) is directly proportional to the displacement (x) and acts in the opposite direction, F = -kx.
Correct Answer: A — Displacement
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Q. The restoring force in simple harmonic motion is directly proportional to: (2023)
A.
Displacement
B.
Velocity
C.
Acceleration
D.
Mass
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Solution
Restoring force (F) is proportional to displacement (x), F = -kx.
Correct Answer: A — Displacement
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Q. The scientific study of classification is known as: (2022)
A.
Taxonomy
B.
Morphology
C.
Anatomy
D.
Ecology
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Solution
Taxonomy is the scientific study of classification of organisms.
Correct Answer: A — Taxonomy
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Q. The self-inductance of a coil depends on which of the following factors? (2021)
A.
Number of turns
B.
Area of cross-section
C.
Length of the coil
D.
All of the above
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Solution
The self-inductance of a coil depends on the number of turns, area of cross-section, and length of the coil.
Correct Answer: D — All of the above
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Q. The specific heat capacity of a substance is defined as the amount of heat required to raise the temperature of: (2023)
A.
1 kg of the substance by 1°C
B.
1 g of the substance by 1°C
C.
1 L of the substance by 1°C
D.
1 mole of the substance by 1°C
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Solution
The specific heat capacity is defined as the amount of heat required to raise the temperature of 1 kg of the substance by 1°C.
Correct Answer: A — 1 kg of the substance by 1°C
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Q. The specific heat capacity of a substance is defined as: (2023)
A.
The amount of heat required to raise the temperature by 1 degree Celsius
B.
The amount of heat required to change the phase of a substance
C.
The heat required to raise the temperature of 1 kg of the substance by 1 degree Celsius
D.
The heat required to raise the temperature of 1 mole of the substance by 1 degree Celsius
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Solution
The specific heat capacity is defined as the amount of heat required to raise the temperature of 1 kg of the substance by 1 degree Celsius.
Correct Answer: C — The heat required to raise the temperature of 1 kg of the substance by 1 degree Celsius
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Q. The term 'adsorption' refers to: (2022)
A.
The process of a substance being taken up by a liquid.
B.
The accumulation of molecules on a surface.
C.
The mixing of two liquids.
D.
The dissolution of a solid in a liquid.
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Solution
Adsorption is the process where molecules accumulate on the surface of a solid or liquid.
Correct Answer: B — The accumulation of molecules on a surface.
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Q. The term 'binomial nomenclature' refers to: (2019)
A.
The two-part naming system for species
B.
The classification of organisms
C.
The study of animal behavior
D.
The grouping of organisms based on habitat
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Solution
Binomial nomenclature is the two-part naming system for species, consisting of the genus and species name.
Correct Answer: A — The two-part naming system for species
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Q. The theory that explains the gradual change in species over time is known as? (1972)
A.
Punctuated equilibrium
B.
Gradualism
C.
Catastrophism
D.
Uniformitarianism
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Solution
Gradualism is the theory that evolution occurs slowly and steadily over long periods of time.
Correct Answer: B — Gradualism
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Q. The theory that organisms can pass on traits acquired during their lifetime is known as?
A.
Natural Selection
B.
Lamarckism
C.
Mendelian Genetics
D.
Darwinism
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Solution
Lamarckism is the theory that organisms can pass on traits acquired during their lifetime, which has been largely discredited in favor of Darwinian evolution.
Correct Answer: B — Lamarckism
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Q. The uncertainty in a measurement is defined as: (2022)
A.
The difference between the maximum and minimum values
B.
The average of the measurements
C.
The standard deviation
D.
The range of values
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Solution
Uncertainty is often defined as the range of values within which the true value lies.
Correct Answer: A — The difference between the maximum and minimum values
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Q. The uncertainty principle is associated with which of the following scientists? (2023)
A.
Bohr
B.
Heisenberg
C.
Schrodinger
D.
Planck
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Solution
The uncertainty principle is a fundamental concept in quantum mechanics formulated by Werner Heisenberg.
Correct Answer: B — Heisenberg
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Q. The unit 'Joule' is a measure of which of the following? (2023)
A.
Force
B.
Energy
C.
Power
D.
Work
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Solution
Joule is the SI unit of energy, which is also equivalent to work done.
Correct Answer: B — Energy
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Q. The unit cell of a diamond structure is best described as which of the following? (2020)
A.
Simple cubic
B.
Face-centered cubic
C.
Body-centered cubic
D.
Hexagonal
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Solution
The diamond structure can be described as a face-centered cubic (FCC) lattice with a basis of two carbon atoms.
Correct Answer: B — Face-centered cubic
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Q. The unit of force in the SI system is derived from which of the following? (2023)
A.
Mass and length
B.
Mass, length, and time
C.
Length and time
D.
Mass and time
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Solution
The unit of force (Newton) is derived from mass, length, and time: kg·m/s².
Correct Answer: B — Mass, length, and time
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Q. The unit of force in the SI system is: (2023)
A.
Joule
B.
Newton
C.
Pascal
D.
Watt
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Solution
The SI unit of force is the Newton (N).
Correct Answer: B — Newton
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Q. The unit of power in the SI system is defined as: (2023)
A.
Joule per second
B.
Newton per meter
C.
Watt per hour
D.
Kilogram meter per second
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Solution
The SI unit of power is defined as Joule per second (Watt).
Correct Answer: A — Joule per second
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Q. The unit of power in the SI system is: (2023)
A.
Joule
B.
Watt
C.
Newton
D.
Pascal
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Solution
The SI unit of power is the Watt (W).
Correct Answer: B — Watt
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Q. The unit of power is defined as: (2023)
A.
Joule per second
B.
Newton per meter
C.
Watt per hour
D.
Kilowatt
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Solution
Power is defined as Joule per second (Watt).
Correct Answer: A — Joule per second
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Q. The unit of work is defined as one joule. What is one joule equivalent to? (2023)
A.
One newton meter
B.
One kilogram meter per second
C.
One watt second
D.
One pascal meter
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Solution
One joule is defined as one newton meter (N·m).
Correct Answer: A — One newton meter
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Q. The viscosity of a fluid is a measure of its: (2022)
A.
Density
B.
Pressure
C.
Resistance to flow
D.
Temperature
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Solution
Viscosity measures a fluid's resistance to flow; higher viscosity means the fluid flows less easily.
Correct Answer: C — Resistance to flow
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Q. The work done by an ideal gas during an isothermal expansion is given by which formula? (2023)
A.
W = PΔV
B.
W = nRT ln(Vf/Vi)
C.
W = ΔU
D.
W = 0
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Solution
The work done by an ideal gas during an isothermal expansion is given by W = nRT ln(Vf/Vi), where Vf and Vi are the final and initial volumes.
Correct Answer: B — W = nRT ln(Vf/Vi)
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Q. Two capacitors of capacitance 2μF and 3μF are connected in series. What is the equivalent capacitance? (2019)
A.
1.2μF
B.
1.5μF
C.
0.86μF
D.
5μF
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Solution
For capacitors in series, 1/C_eq = 1/C1 + 1/C2. Thus, 1/C_eq = 1/2 + 1/3 = 5/6, giving C_eq = 6/5 = 1.2μF.
Correct Answer: C — 0.86μF
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Q. Two identical charges are placed 1 m apart. If the distance is reduced to 0.5 m, how does the force between them change? (2022)
A.
It doubles
B.
It remains the same
C.
It quadruples
D.
It halves
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Solution
According to Coulomb's law, F ∝ 1/r². Reducing the distance to half increases the force by a factor of 4.
Correct Answer: C — It quadruples
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Q. Two identical charges are placed 1 m apart. If the magnitude of each charge is doubled, what happens to the force between them? (2022)
A.
It remains the same
B.
It doubles
C.
It quadruples
D.
It halves
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Solution
According to Coulomb's law, F ∝ q1 * q2. If both charges are doubled, the force becomes 4 times the original force.
Correct Answer: C — It quadruples
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