PHYSICS MCQS 01
What is the SI unit of electric current?VoltOhmAmpereWattC) AmpereThe ampere (A) is the SI unit of electric current, measuring the flow of electric charge. A volt measures potential difference, an ohm measures resistance, and a watt measures power.
Which law states that "for every action, there is an equal and opposite reaction"?Newton's First Law of MotionNewton's Second Law of MotionNewton's Third Law of MotionLaw of Universal GravitationC) Newton's Third Law of MotionNewton's Third Law of Motion is a fundamental principle of physics that states that if an object exerts a force on a second object, the second object exerts an equal and opposite force on the first.
What is the process of a solid turning directly into a gas without passing through the liquid phase?MeltingCondensation SublimationEvaporationC) SublimationSublimation is the transition of a substance directly from the solid to the gas state, without first becoming a liquid. A common example is dry ice (solid carbon dioxide) turning into gas.
What is the name of the force that keeps planets in orbit around the Sun? Magnetic force Centrifugal forceElectrostatic force Gravitational forceD) Gravitational forceGravity is the fundamental force of attraction that exists between any two objects with mass. It is the force that holds the planets in their orbits.
The bending of light as it passes from one medium to another is called:ReflectionRefraction DiffractionDispersionB) RefractionRefraction is the change in direction of light (or other waves) as it passes from one medium to another, caused by its change in speed.
What is the unit of measurement for frequency?NewtonHertzPascal JouleB) HertzThe hertz (Hz) is the unit of frequency, defined as one cycle per second.
What principle explains why a ship floats on water?Pascal's Principle Archimedes' PrincipleBernoulli's PrincipleNewton's Law of GravitationB) Archimedes' PrincipleArchimedes' Principle states that the upward buoyant force exerted on a body immersed in a fluid is equal to the weight of the fluid that the body displaces.
What is the main characteristic of a superconductor?It has very high electrical resistance.It has zero electrical resistance below a critical temperature.It can only conduct electricity at room temperature.It has a very high melting point. B) It has zero electrical resistance below a critical temperature.Superconductivity is a phenomenon characterized by a loss of all electrical resistance in certain materials when they are cooled below a characteristic temperature.
The sound waves with frequencies below the audible range for humans are called:SupersonicHypersonicUltrasonicInfrasonic D) Infrasonic Infrasonic waves are sound waves with frequencies below 20 Hz, which is the lower limit of human hearing.
What does the law of conservation of energy state?Energy can be created but not destroyed.Energy can be destroyed but not created. Energy can be converted from one form to another but cannot be created or destroyed.The total energy of a system is always zero.C) Energy can be converted from one form to another but cannot be created or destroyed.The law of conservation of energy states that the total energy of an isolated system remains constant; it is said to be conserved over time.
The process of a liquid changing to a gas at a temperature below its boiling point is called:CondensationEvaporation MeltingFreezing B) EvaporationEvaporation is a type of vaporization that occurs at the surface of a liquid as it transitions into the gas phase.
What is the unit of electric current?VoltOhmAmpere Watt C) AmpereThe ampere (A) is the SI unit of electric current, defined as the flow of electric charge.
According to Ohm's law, the voltage across a conductor is directly proportional to the:ResistanceCurrentPower Energy B) Current Ohm's law states that the voltage (V) across an ideal resistor is proportional to the current (I) flowing through it, where the constant of proportionality is the resistance (R), expressed as V = IR.
What is the phenomenon of light changing direction as it passes from one medium to another called?ReflectionDiffraction RefractionInterferenceC) RefractionRefraction is the change in direction of a wave, such as light, as it passes from one medium to another with a different density.
The law of conservation of energy states that energy: Can be created but not destroyed. Can be destroyed but not created.Can be created and destroyed.Can neither be created nor destroyed.D) Can neither be created nor destroyed.The law of conservation of energy, also known as the first law of thermodynamics, states that the total energy of an isolated system remains constant; it can only be transformed from one form to another.