Welcome to the Scientific Laws and Theories MCQs with Answers. In this post, we are sharing Scientific Laws and Theories Multiple Choice Questions and Answers in Everyday Science section for various competitive exams in Pakistan. Each question offers a chance to enhance your knowledge regarding Scientific Laws and Theories online MCQs Test.
Which scientific law states that for every action, there is an equal and opposite reaction?
A) Newton’s Third Law
B) Newton’s First Law
C) Newton’s Second Law
D) Law of Universal Gravitation
What does the theory of relativity primarily address?
A) Space and time
B) Electromagnetic forces
C) Quantum mechanics
D) Thermodynamics
According to the Law of Conservation of Energy, energy cannot be:
A) Created or destroyed
B) Transferred
C) Converted
D) Measured
Which theory proposes that the universe began from a singularity and has been expanding ever since?
A) Big Bang Theory
B) Steady State Theory
C) Nebular Hypothesis
D) Quantum Theory
What is the main principle of Darwin’s Theory of Evolution?
A) Natural selection
B) Genetic drift
C) Plate tectonics
D) Electromagnetic induction
Which law states that the rate of a chemical reaction is proportional to the concentration of the reactants?
A) Rate Law
B) Law of Mass Action
C) Law of Conservation of Mass
D) Law of Definite Proportions
Which theory explains the behavior of gases in terms of molecules in constant, random motion?
A) Kinetic Molecular Theory
B) Atomic Theory
C) Quantum Theory
D) Theory of Relativity
According to Boyle’s Law, what happens to the volume of a gas when its pressure increases, provided temperature is constant?
A) Volume decreases
B) Volume increases
C) Volume remains the same
D) Volume doubles
Which theory proposes that light has both wave-like and particle-like properties?
A) Wave-Particle Duality
B) Electromagnetic Theory
C) Relativity Theory
D) Quantum Theory
What does Charles’s Law state about the relationship between temperature and volume of a gas?
A) Volume increases with temperature
B) Volume decreases with temperature
C) Volume is unaffected by temperature
D) Volume and temperature are inversely proportional
Which scientific law describes the behavior of a gas under constant temperature and pressure?
A) Ideal Gas Law
B) Boyle’s Law
C) Charles’s Law
D) Gay-Lussac’s Law
Which theory is associated with the concept of gravity as a curvature of spacetime?
A) General Relativity
B) Special Relativity
C) Quantum Mechanics
D) Newtonian Mechanics
According to the Law of Superposition, in an undisturbed sequence of sedimentary rocks, the oldest rocks are:
A) At the bottom
B) At the top
C) In the middle
D) Randomly distributed
Which principle states that energy in a closed system is constant, though it may change forms?
A) Conservation of Energy
B) Conservation of Momentum
C) Conservation of Mass
D) Conservation of Charge
Which law states that the pressure of a gas is directly proportional to its absolute temperature when volume is constant?
A) Gay-Lussac’s Law
B) Charles’s Law
C) Boyle’s Law
D) Avogadro’s Law
What does the Heisenberg Uncertainty Principle state about the measurement of particles?
A) You cannot simultaneously know the exact position and momentum of a particle
B) Energy cannot be created or destroyed
C) The entropy of a system always increases
D) The velocity of light is constant in a vacuum
Which theory states that the behavior of gases can be described by the relationship of pressure, volume, and temperature?
A) Ideal Gas Theory
B) Kinetic Molecular Theory
C) Quantum Theory
D) Relativity Theory
Which principle explains why objects in fluid experience a buoyant force equal to the weight of the fluid they displace?
A) Archimedes’ Principle
B) Bernoulli’s Principle
C) Pascal’s Principle
D) Newton’s Law
What does the Law of Definite Proportions state about compounds?
A) A chemical compound always contains the same elements in the same proportions by mass
B) The total mass of reactants equals the total mass of products
C) The ratio of the volumes of gases involved in a reaction is always constant
D) Energy cannot be created or destroyed, only transformed
Which principle states that the entropy of an isolated system always increases over time?
A) Second Law of Thermodynamics
B) First Law of Thermodynamics
C) Law of Conservation of Energy
D) Law of Conservation of Momentum
According to the Law of Conservation of Momentum, in a closed system, the total momentum:
A) Remains constant
B) Increases with time
C) Decreases with time
D) Is transferred to external forces
Which theory explains the behavior of objects at the atomic and subatomic levels?
A) Quantum Mechanics
B) Classical Mechanics
C) General Relativity
D) Electrodynamics
Which law states that the current through a conductor between two points is directly proportional to the voltage across the two points?
A) Ohm’s Law
B) Kirchhoff’s Law
C) Faraday’s Law
D) Coulomb’s Law
Which scientific law describes the behavior of a body in uniform motion?
A) Newton’s First Law
B) Newton’s Second Law
C) Newton’s Third Law
D) Law of Universal Gravitation
What does Avogadro’s Law state about gases?
A) Equal volumes of gases at the same temperature and pressure contain equal numbers of molecules
B) The pressure of a gas is inversely proportional to its volume
C) The volume of a gas is directly proportional to its temperature
D) The energy of a gas is directly proportional to its temperature
Which theory is used to explain the expansion of the universe?
A) Big Bang Theory
B) Steady State Theory
C) Nebular Hypothesis
D) Quantum Theory
Which principle explains the behavior of an ideal gas and relates its pressure, volume, and temperature?
A) Ideal Gas Law
B) Kinetic Molecular Theory
C) Charles’s Law
D) Boyle’s Law
What does the Principle of Superposition in geology state about rock layers?
A) The youngest layers are on top, and the oldest are at the bottom
B) Layers are always horizontal when they are first formed
C) All layers are deposited simultaneously
D) The layers of rock always fold and bend over time
Which scientific law states that the volume of a given mass of gas is directly proportional to its temperature at constant pressure?
A) Charles’s Law
B) Boyle’s Law
C) Gay-Lussac’s Law
D) Avogadro’s Law
Which scientific law describes the force of gravity between two masses?
A) Law of Universal Gravitation
B) Newton’s First Law
C) Coulomb’s Law
D) Hooke’s Law
What does the First Law of Thermodynamics state about energy in a closed system?
A) Energy cannot be created or destroyed, only transformed
B) Entropy always increases over time
C) The total energy of an isolated system is constant
D) The total momentum is conserved in a closed system
Which principle states that the rate of a reaction is proportional to the concentration of the reactants?
A) Rate Law
B) Law of Mass Action
C) Law of Conservation of Mass
D) Law of Definite Proportions
According to the Second Law of Thermodynamics, the entropy of an isolated system:
A) Always increases
B) Always decreases
C) Remains constant
D) Depends on the temperature
Which scientific theory explains the relationship between electricity and magnetism?
A) Electromagnetic Theory
B) Quantum Theory
C) General Relativity
D) Theory of Relativity
Which law describes how the pressure of a gas is related to its temperature at constant volume?
A) Gay-Lussac’s Law
B) Boyle’s Law
C) Charles’s Law
D) Avogadro’s Law
What does the principle of conservation of angular momentum state?
A) The total angular momentum of a closed system remains constant if no external torque acts on it
B) The total linear momentum of a closed system remains constant if no external force acts on it
C) The total energy of a closed system remains constant if no external work is done
D) The total entropy of a closed system always increases
Which scientific theory describes the behavior of particles at extremely low temperatures?
A) Bose-Einstein Condensate Theory
B) Quantum Electrodynamics
C) General Relativity
D) Special Relativity
What does the principle of conservation of charge state?
A) The total electric charge in an isolated system remains constant
B) The total energy in a closed system remains constant
C) The total momentum in a closed system remains constant
D) The total angular momentum in a closed system remains constant
Which law states that the amount of dissolved gas in a liquid is directly proportional to its partial pressure?
A) Henry’s Law
B) Raoult’s Law
C) Dalton’s Law
D) Gay-Lussac’s Law
Which principle states that the change in the state of a system is proportional to the force applied?
A) Hooke’s Law
B) Pascal’s Principle
C) Bernoulli’s Principle
D) Archimedes’ Principle
Which scientific law states that the rate of a chemical reaction is constant at a given temperature and pressure?
A) Arrhenius Equation
B) Rate Law
C) Law of Mass Action
D) Van’t Hoff Equation
Which principle explains the behavior of fluids in motion, particularly how pressure changes with velocity?
A) Bernoulli’s Principle
B) Pascal’s Principle
C) Archimedes’ Principle
D) Coulomb’s Law
Which theory explains the distribution of stars and galaxies in the universe?
A) Cosmological Principle
B) Quantum Theory
C) Theory of Relativity
D) Kinetic Theory
What does the Law of Conservation of Mass state about mass in a chemical reaction?
A) Mass is neither created nor destroyed during a chemical reaction
B) The mass of reactants equals the mass of products
C) The total mass of an isolated system always increases
D) The total mass of an isolated system always decreases
Which principle states that for a given fluid in equilibrium, the pressure is the same at all points in the fluid?
A) Pascal’s Principle
B) Archimedes’ Principle
C) Bernoulli’s Principle
D) Hooke’s Law
Which scientific principle is used to explain the operation of hydraulic systems?
A) Pascal’s Principle
B) Bernoulli’s Principle
C) Archimedes’ Principle
D) Newton’s Law
What does the Law of Multiple Proportions state about elements in compounds?
A) When two elements form more than one compound, the masses of one element that combine with a fixed mass of the other are in small whole number ratios
B) The ratio of the masses of elements in a compound is constant
C) The total mass of reactants equals the total mass of products
D) Elements combine in fixed proportions to form compounds
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