# 100 Physics Questions and Answers

## 100 Physics Questions and Answers

What is the formula for calculating velocity?

What is the formula for calculating acceleration?

Answer: Acceleration = (final velocity – initial velocity)/time

What is the formula for calculating force?

Answer: Force = mass x acceleration

What is the formula for calculating work?

Answer: Work = force x distance

What is the formula for calculating power?

What is the difference between speed and velocity?

Answer: Speed is the distance covered per unit of time, while velocity is the distance covered per unit of time in a specific direction.

What is the difference between weight and mass?

Answer: Weight is the force exerted by gravity on an object, while mass is the amount of matter in an object.

What is the law of conservation of energy?

Answer: The law of conservation of energy states that energy cannot be created or destroyed but can be converted from one form to another.

What is the formula for calculating potential energy?

Answer: Potential energy = mass x gravity x height

What is the formula for calculating kinetic energy?

Answer: Kinetic energy = 1/2 x mass x velocity^2

What is the formula for calculating momentum?

Answer: Momentum = mass x velocity

What is the difference between a conductor and an insulator?

Answer: A conductor is a material that allows electrons to flow through it, while an insulator is a material that does not allow electrons to flow through it.

What is the formula for calculating electric power?

Answer: Electric power = voltage x current

What is Ohm’s law?

Answer: Ohm’s law states that the current through a conductor between two points is directly proportional to the voltage across the two points.

What is the difference between series and parallel circuits?

Answer: In a series circuit, the components are connected in a single loop, while in a parallel circuit, the components are connected in multiple branches.

What is the difference between a concave and a convex lens?

Answer: A concave lens is thinner in the middle and thicker at the edges, while a convex lens is thicker in the middle and thinner at the edges.

What is the law of reflection?

Answer: The law of reflection states that the angle of incidence is equal to the angle of reflection.

What is the formula for calculating frequency?

What is the difference between longitudinal and transverse waves?

Answer: In a longitudinal wave, the vibrations are parallel to the direction of wave propagation, while in a transverse wave, the vibrations are perpendicular to the direction of wave propagation.

What is the formula for calculating the speed of light in a vacuum?

Answer: The speed of light in a vacuum is 299,792,458 meters per second.

What is the difference between a scalar and a vector quantity?

Answer: A scalar quantity has only magnitude, while a vector quantity has both magnitude and direction.

What is the difference between elastic and inelastic collisions?

Answer: In an elastic collision, the total kinetic energy is conserved, while in an inelastic collision, some of the kinetic energy is lost.

What is the formula for calculating the period of a pendulum?

What is the formula for calculating the frequency of a wave?

What is the formula for calculating the force of gravity between two objects?

Answer: Force of gravity = (G x m1 x m2)/d^2, where G is the gravitational constant, m1, and m2 are the masses of the two objects, and d is the distance between them.

What is the formula for calculating the density of an object?

What is the difference between a magnetic field and an electric field?

Answer: A magnetic field is created by moving charges or magnetic materials, while an electric field is created by static charges.

What is the difference between nuclear fusion and nuclear fission?

Answer: Nuclear fusion is the process of combining two atomic nuclei to form a heavier nucleus, while nuclear fission is the process of splitting a heavy nucleus into two smaller nuclei.

What is the formula for calculating the wavelength of a wave?

What is the difference between a solid, liquid, and gas?

Answer: A solid has a fixed shape and volume, a liquid has a fixed volume but takes the shape of its container, and a gas takes both the shape and volume of its container.

What is the difference between heat and temperature?

Answer: Heat is a form of energy that flows from hot to cold objects, while the temperature is a measure of the average kinetic energy of the particles in a substance.

What is the difference between conduction and convection?

Answer: Conduction is the transfer of heat through a material by direct contact, while convection is the transfer of heat through the movement of fluids.

What is the difference between a chemical change and a physical change?

Answer: A chemical change is a change that produces a new substance with different properties, while a physical change is a change that does not produce a new substance.

What is the difference between potential energy and kinetic energy?

Answer: Potential energy is energy stored in an object due to its position or configuration, while kinetic energy is energy due to motion.

What is the formula for calculating the resistance of a wire?

What is the difference between a bar magnet and an electromagnet?

Answer: A bar magnet is a permanent magnet that produces a magnetic field due to the alignment of its atoms, while an electromagnet is a magnet that produces a magnetic field when an electric current flows through it.

What is the difference between a black hole and a neutron star?

Answer: A black hole is an object with a gravitational pull so strong that nothing, not even light, can escape it, while a neutron star is a small, extremely dense star made mostly of neutrons.

What is the difference between a wave and a particle?

Answer: A wave is a disturbance that propagates through a medium or through space, while a particle is a discrete unit of matter.

What is the difference between a telescope and a microscope?

Answer: A telescope is used to view distant objects, while a microscope is used to view small objects.

What is the difference between a synchronous motor and an asynchronous motor?

Answer: A synchronous motor runs at a fixed speed that is synchronized with the frequency of the power supply, while an asynchronous motor runs at a variable speed.

What is the difference between an AC and DC motor?

Answer: An AC motor operates on alternating current, while a DC motor operates on direct current.

What is the formula for calculating work?

Answer: Work = force x distance x cos(angle between force and displacement)

What is the formula for calculating power?

What is the difference between a series circuit and a parallel circuit?

Answer: In a series circuit, the components are connected in a single loop, while in a parallel circuit, the components are connected in multiple branches.

What is the difference between a mechanical wave and an electromagnetic wave?

Answer: A mechanical wave requires a medium to propagate, while an electromagnetic wave can propagate through a vacuum.

What is the difference between a conductor and an insulator?

Answer: A conductor allows electric charges to flow through it easily, while an insulator does not.

What is the difference between a cathode ray tube and an LCD display?

Answer: A cathode ray tube works by firing a beam of electrons at a phosphor-coated screen, while an LCD display works by manipulating the polarization of light using liquid crystals.

What is the difference between a single lens and a compound lens?

Answer: A single lens is a single piece of glass or plastic with curved surfaces that refract light, while a compound lens is made up of multiple lenses that work together to focus light.

What is the difference between a primary cell and a secondary cell?

Answer: A primary cell is a non-rechargeable cell that generates electricity through a chemical reaction, while a secondary cell is a rechargeable cell that can be recharged by applying an external current.

What is the difference between a generator and a motor?

Answer: A generator converts mechanical energy into electrical energy, while a motor converts electrical energy into mechanical energy.

What is the difference between a proton and a neutron?

Answer: A proton is a positively charged particle found in the nucleus of an atom, while a neutron is an uncharged particle also found in the nucleus.

What is the difference between a wavelength and a frequency?

Answer: A wavelength is a distance between two consecutive peaks or troughs of a wave, while frequency is the number of complete cycles of the wave that pass a given point in one second.

What is the difference between a scalar and a vector?

Answer: A scalar is a quantity that has only magnitude, while a vector is a quantity that has both magnitude and direction.

What is the difference between a sound wave and a light wave?

Answer: A sound wave is a mechanical wave that requires a medium to propagate, while a light wave is an electromagnetic wave that can propagate through a vacuum.

What is the difference between a thermistor and a thermocouple?

Answer: A thermistor is a temperature-sensitive resistor that changes its resistance with temperature, while a thermocouple is a device that generates a voltage proportional to the temperature difference between two junctions.

What is the difference between an open circuit and a closed circuit?

Answer: An open circuit is a circuit that is incomplete and does not allow current to flow, while a closed circuit is a complete circuit that allows current to flow.

What is the difference between a natural magnet and an artificial magnet?

Answer: A natural magnet is a magnet that occurs in nature, such as a lodestone, while an artificial magnet is a magnet that is made by humans, such as a bar magnet.

What is the difference between a supernova and a nova?

Answer: A supernova is a massive explosion that occurs at the end of a star’s life, while a nova is a sudden brightening of a star that occurs when a white dwarf star pulls matter from a companion star.

What is the difference between a proton and an electron?

Answer: A proton is a positively charged particle found in the nucleus of an atom, while an electron is a negatively charged particle that orbits the nucleus.

What is the difference between a potential difference and an electromotive force?

Answer: A potential difference is a difference in electrical potential energy between two points in a circuit, while an electromotive force is an energy per unit charge supplied by a voltage source.

What is the difference between an isotope and an ion?

Answer: An isotope is an atom with the same number of protons but a different number of neutrons, while an ion is an atom or molecule that has an unequal number of protons and electrons, giving it a net electrical charge.

What is the difference between a mechanical equilibrium and a thermal equilibrium?

Answer: A mechanical equilibrium is a state where there is no net force acting on a system, while a thermal equilibrium is a state where there is no net flow of heat between two objects.

What is the difference between a convex lens and a concave lens?

Answer: A convex lens is thicker at the center than at the edges and converges light, while a concave lens is thinner at the center than at the edges and diverges light.

What is the difference between a centrifugal force and a centripetal force?

Answer: A centrifugal force is an apparent force that appears to push objects away from the center of rotation, while a centripetal force is a real force that pulls objects toward the center of rotation.

What is the difference between a photon and a particle?

Answer: A photon is a massless particle that carries electromagnetic energy, while a particle can have mass and can carry other types of energy.

What is the difference between a conductor and a semiconductor?

Answer: A conductor allows electric charges to flow through it easily, while a semiconductor is a material that has electrical conductivity between that of a conductor and an insulator, and can be controlled by doping.

What is the difference between a micrometer and a nanometer?

Answer: A micrometer is one-millionth of a meter, while a nanometer is one billionth of a meter.

What is the difference between a satellite and a probe?

Answer: A satellite is an object that orbits a planet, while a probe is a device that is sent into space to explore a planet or other celestial body.

What is the difference between an alpha particle and a beta particle?

Answer: An alpha particle is a helium nucleus consisting of two protons and two neutrons, while a beta particle is an electron or a positron.

What is the difference between an elastic collision and an inelastic collision?

Answer: In an elastic collision, kinetic energy is conserved, while in an inelastic collision, kinetic energy is not conserved.

What is the difference between a motor and a generator?

Answer: A motor converts electrical energy into mechanical energy, while a generator converts mechanical energy into electrical energy.

What is the difference between a primary wave and a secondary wave?

Answer: A primary wave, also known as a P-wave, is a seismic wave that causes particles to move back and forth in the same direction as the wave is traveling, while a secondary wave, also known as an S-wave, is a seismic wave that causes particles to move up and down perpendicular to the direction of wave travel.

What is the difference between static friction and kinetic friction?

Answer: Static friction is the force that opposes the motion of an object at rest, while kinetic friction is the force that opposes the motion of an object in motion.

What is the difference between a synchronous motor and an asynchronous motor?

Answer: A synchronous motor runs at a constant speed and is synchronized with the frequency of the power supply, while an asynchronous motor runs at a variable speed and is not synchronized with the frequency of the power supply.

What is the difference between a superconductor and a normal conductor?

Answer: A superconductor has zero resistance to the flow of electrical current, while a normal conductor has some resistance to the flow of electrical current.

What is the difference between a volt and an ampere?

Answer: A volt is a unit of electrical potential difference, while an ampere is a unit of electrical current.

What is the difference between an emulsion and a suspension?

Answer: An emulsion is a mixture of two immiscible liquids, while a suspension is a mixture of a solid and a liquid.

What is the difference between an endothermic reaction and an exothermic reaction?

Answer: In an endothermic reaction, energy is absorbed from the surroundings, while in an exothermic reaction, energy is released to the surroundings.

What is the difference between an insulator and a dielectric?

Answer: An insulator is a material that does not conduct electrical current, while a dielectric is an insulator that can be polarized by an electric field.

What is the difference between an electric field and a magnetic field?

Answer: An electric field is a field of force that surrounds an electric charge, while a magnetic field is a field of force that surrounds a magnetic pole or a moving charged particle.

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What is the difference between a scalar and a vector?

Answer: A scalar is a quantity that has magnitude but no direction, while a vector is a quantity that has both magnitude and direction.

What is the difference between a black hole and a neutron star?

Answer: A black hole is a region of space-time where gravity is so strong that nothing can escape from it, while a neutron star is a very dense and compact star composed mostly of neutrons.

What is the difference between plasma and gas?

Answer: A plasma is a state of matter in which a gas is ionized and becomes electrically conductive, while a gas is a state of matter in which the particles are in constant motion and have no definite shape or volume.

What is the difference between a solenoid and a coil?

Answer: A solenoid is a long, cylindrical coil of wire, while a coil is a series of loops of wire.

What is the difference between a converging lens and a diverging lens?

Answer: A converging lens is a lens that causes parallel light rays to converge to a point, while a diverging lens is a lens that causes parallel light rays to diverge away from a point.

What is the difference between thermoplastic and thermosetting plastic?

Answer: A thermoplastic can be melted and reshaped multiple times, while a thermosetting plastic cannot be melted or reshaped once it has been set.

What is the difference between acceleration and velocity?

Answer: Acceleration is the rate at which velocity changes over time, while velocity is the speed and direction of an object.

What is the difference between an elastic modulus and a plastic modulus?

Answer: An elastic modulus is a measure of a material’s ability to deform elastically, while a plastic modulus is a measure of a material’s ability to deform plastically.

What is the difference between an exoplanet and a planet?

Answer: An exoplanet is a planet that orbits a star other than our Sun, while a planet is any large celestial body that orbits a star and does not produce its own light.

What is the difference between an orbit and a trajectory?

Answer: An orbit is a path that an object takes as it revolves around another object under the influence of gravity, while a trajectory is a path that an object takes as it moves through space.

What is the difference between force and pressure?

Answer: Force is a push or a pull that causes an object to move or change its motion, while pressure is the force per unit area applied to a surface.

What is the difference between heat and temperature?

Answer: Heat is the transfer of thermal energy between two bodies due to a temperature difference, while the temperature is a measure of the average kinetic energy of the particles in a substance.

What is the difference between mechanical waves and electromagnetic waves?

Answer: Mechanical waves are waves that require a medium to travel through, while electromagnetic waves are waves that can travel through a vacuum.

What is the difference between momentum and impulse?

Answer: Momentum is a measure of the motion of an object, while the impulse is the change in momentum of an object due to a force applied over a certain period of time.

What is the difference between nuclear fusion and nuclear fission?

Answer: Nuclear fusion is the process of combining two atomic nuclei to form a heavier nucleus, while nuclear fission is the process of splitting a heavy atomic nucleus into two or lighter nuclei.

What is the difference between periodic and non-periodic motion?

Answer: Periodic motion is the motion that repeats itself at regular intervals, while non-periodic motion is the motion that does not repeat itself.

What is the difference between potential energy and kinetic energy?

Answer: Potential energy is energy that an object has due to its position or configuration, while kinetic energy is energy that an object has due to its motion.

What is the difference between power and energy?

Answer: Power is the rate at which energy is transferred or used, while energy is the capacity to do work.

What is the difference between speed and velocity?

Answer: Speed is the rate at which an object moves, while velocity is the rate at which an object moves in a particular direction.

What is the difference between static electricity and current electricity?

Answer: Static electricity is the buildup of electric charge on the surface of a material, while current electricity is the flow of electric charge through a conductor.