PHYSICS ONE LINER MCQS
Physics One Liner MCQs help learners grasp key principles like motion, energy, and matter with ease. These short, direct questions make complex concepts simple and clear. Whether for PPSC, FPSC, or entry-level exams, regular practice sharpens both memory and accuracy — ensuring success in theoretical and applied physics tests.
Basic Concepts of Physics
What is the SI unit of force?
NewtonWhat is the SI unit of work?
JouleWhat is the SI unit of power?
WattWhat is the SI unit of energy?
JouleWhat is the SI unit of pressure?
PascalWho discovered the law of motion?
Isaac NewtonWhat is the speed of light in vacuum?
3 × 10⁸ m/sWhat is the acceleration due to gravity on Earth?
9.8 m/s²What is the unit of frequency?
HertzWhat instrument measures current?
AmmeterWhat instrument measures voltage?
VoltmeterWhat is the SI unit of electric charge?
CoulombWhat is the unit of resistance?
OhmWhat is Ohm’s Law?
V = IRWhat is the unit of electric power?
WattWhat is the SI unit of magnetic field?
TeslaWhat is absolute zero temperature in Celsius?
–273°CWhat is the SI unit of temperature?
KelvinWhat is the unit of luminous intensity?
CandelaWhat is the speed of sound in air?
343 m/s
Short Note:
Basic physics concepts form the foundation for understanding mechanics, thermodynamics, and electromagnetism. Memorize SI units and definitions for fast recall in exams.
Mechanics and Motion (21–40)
What is inertia?
Resistance to change in motionWhat is momentum?
Product of mass and velocityWhat is the unit of momentum?
kg·m/sWhat is acceleration?
Rate of change of velocityWhat is velocity?
Displacement per unit timeWhat is uniform motion?
Motion at constant speed in a straight lineWhat is friction?
Force opposing motionWhat is the coefficient of friction?
Ratio of frictional force to normal forceWhat is projectile motion?
Motion of a body under gravityWhat is circular motion?
Motion in a circular pathWhat is centripetal force?
Force toward the center of a circleWhat is centrifugal force?
Apparent force away from centerWhat is torque?
Turning effect of a forceWhat is the principle of lever?
Force × arm = load × armWhat is Newton’s first law?
Law of inertiaWhat is Newton’s second law?
Force = mass × accelerationWhat is Newton’s third law?
Action = ReactionWhat is work?
Force × distanceWhat is kinetic energy?
Energy due to motionWhat is potential energy?
Energy due to position
Short Note:
Mechanics MCQs strengthen your understanding of force, motion, and energy. These are high-scoring sections in all competitive exams.
Heat and Thermodynamics (41–60)
What is heat?
Form of energy causing temperature riseWhat is temperature?
Degree of hotness or coldnessWhat is specific heat?
Heat to raise 1 kg of substance by 1°CWhat is latent heat?
Heat for change of state without temperature changeWhat is conduction?
Heat transfer through solidsWhat is convection?
Heat transfer through fluidsWhat is radiation?
Heat transfer through wavesWhat is the SI unit of heat?
JouleWhat is 0 Kelvin in Celsius?
–273°CWhat is thermal expansion?
Increase in size when heatedWhat is entropy?
Measure of disorderWhat is the first law of thermodynamics?
Energy can’t be created or destroyedWhat is the second law of thermodynamics?
Heat flows from hot to coldWhat is absolute zero?
Temperature with no molecular motionWhat is calorimeter used for?
Measuring heat changesWhat is a heat engine?
Device converting heat into workWhat is Carnot engine?
Ideal heat engineWhat is thermal conductivity?
Rate of heat transferWhat is adiabatic process?
No heat exchangeWhat is isothermal process?
Constant temperature
Short Note:
Thermodynamics is core for understanding engines, energy conversion, and physical chemistry concepts.
Light and Optics (61–80)
What is reflection?
Bouncing back of lightWhat is refraction?
Bending of light in a new mediumWhat is total internal reflection?
Complete reflection within a denser mediumWhat is the speed of light in glass?
Less than in airWhat is the angle of incidence?
Angle between incident ray and normalWhat is the mirror formula?
1/f = 1/v + 1/uWhat is a concave mirror?
Mirror that converges lightWhat is a convex mirror?
Mirror that diverges lightWhat is the focal point?
Point where rays meet after reflection/refractionWhat is the unit of focal length?
MeterWhat is lens?
Transparent medium refracting lightWhat is power of lens measured in?
DioptersWhat type of lens corrects myopia?
Concave lensWhat type of lens corrects hypermetropia?
Convex lensWhat is a prism?
Transparent body refracting lightWhat causes a rainbow?
Dispersion of lightWhat is diffraction?
Bending of waves around obstaclesWhat is interference?
Superposition of wavesWhat is polarization?
Restriction of light vibration to one planeWhat color has the highest frequency?
Violet
Short Note:
Optics MCQs enhance conceptual understanding of light behavior — crucial for engineering and entry-level science exams.
Electricity and Magnetism (81–100)
What is electricity?
Flow of electronsWhat is current?
Flow of charge per unit timeWhat is voltage?
Potential difference between two pointsWhat is resistance?
Opposition to currentWhat is a conductor?
Material allowing current flowWhat is an insulator?
Material preventing current flowWhat is an electric circuit?
Closed path for current flowWhat is series circuit?
Components connected end to endWhat is parallel circuit?
Components connected across common pointsWhat is electromagnetic induction?
Production of current by changing magnetic fieldWho discovered electromagnetic induction?
Michael FaradayWhat is a transformer?
Device to increase or decrease voltageWhat is an electric motor?
Converts electrical energy to mechanical energyWhat is an electric generator?
Converts mechanical energy to electrical energyWhat is the magnetic field?
Region around a magnet with magnetic forceWhat is the SI unit of magnetic flux?
WeberWhat is Lenz’s Law?
Induced current opposes cause producing itWhat is Fleming’s right-hand rule used for?
Finding direction of induced currentWhat is Fleming’s left-hand rule used for?
Finding direction of force on conductorWhat is alternating current (AC)?
Current that changes direction periodically
Short Note:
Electricity and magnetism form the heart of modern technology. Understanding these helps in power systems, electronics, and circuit-based MCQs.
(101–120)
This section strengthens your grasp on forces, motion, and pressure. These one-liners are crafted for fast recall — ideal for entry tests and competitive exams.
Who formulated the three laws of motion?
Isaac NewtonWhat is the SI unit of force?
Newton (N)What causes an object to resist a change in motion?
InertiaWhat is momentum equal to?
Mass × VelocityWhat is the SI unit of pressure?
PascalWhich device measures atmospheric pressure?
BarometerWho invented the barometer?
Evangelista TorricelliWhat type of friction occurs between two surfaces at rest?
Static FrictionWhat type of friction occurs when an object slides?
Kinetic FrictionWhich law states that pressure in a liquid is transmitted equally in all directions?
Pascal’s LawWhat does Archimedes’ principle explain?
Buoyant ForceWhat is torque?
Rotational forceWhat is the moment of force?
Force × Perpendicular distanceWhat is used to measure torque?
Torque WrenchWhat is mechanical advantage?
Load / EffortWhat is the efficiency of an ideal machine?
100%What is a lever?
A simple machineWhat is a pulley used for?
Lifting heavy loadsWhat type of energy is possessed by a moving body?
Kinetic EnergyWhat type of energy is stored in a stretched spring?
Potential Energy
Short Intro (121–140)
These one-liners focus on energy, work, and power. Regular practice boosts concept clarity and quick recall.
What is the SI unit of work?
JouleWhat is the formula for work?
Force × DistanceWhat is the SI unit of power?
WattWhat is 1 horsepower equal to?
746 WattsWho discovered the law of conservation of energy?
JouleEnergy cannot be created or destroyed — this is called?
Law of Conservation of EnergyWhat type of energy transformation occurs in an electric fan?
Electrical to MechanicalWhat energy conversion happens in a battery?
Chemical to ElectricalWhat energy conversion occurs in a microphone?
Sound to ElectricalWhat energy conversion occurs in a loudspeaker?
Electrical to SoundWhat is the source of solar energy?
SunWhat is the main component of solar cells?
SiliconWhat type of energy is wind energy?
Kinetic EnergyWhat is hydropower generated from?
Moving WaterWhat is geothermal energy derived from?
Earth’s Internal HeatWhat type of energy does a nuclear reactor produce?
Nuclear EnergyWhat is the SI unit of energy?
JouleWhat is potential energy due to height called?
Gravitational Potential EnergyWhat is kinetic energy dependent on?
Mass and VelocityWhat type of energy is stored in fuel?
Chemical Energy
Short Intro (141–160)
This segment covers heat, temperature, and thermodynamics. Questions are structured for conceptual clarity and factual retention.
What is the SI unit of temperature?
KelvinWhat is the freezing point of water in Celsius?
0°CWhat is the boiling point of water in Celsius?
100°CWhat is the normal body temperature in Fahrenheit?
98.6°FWhat is the instrument used to measure temperature?
ThermometerWho invented the thermometer?
Galileo GalileiWhat does a calorimeter measure?
Heat EnergyWhat is the transfer of heat through solids called?
ConductionWhat is the transfer of heat through liquids or gases called?
ConvectionWhat is the transfer of heat through electromagnetic waves called?
RadiationWhat is the SI unit of heat?
JouleWhat is the amount of heat required to raise 1 kg of water by 1°C called?
Specific HeatWhat is the process of heat transfer without any medium?
RadiationWhich gas is used in refrigerators?
FreonWhat is absolute zero temperature?
–273.15°CWho formulated the laws of thermodynamics?
Rudolf ClausiusWhat is entropy?
Measure of disorderWhat is a heat engine?
Device converting heat to workWhat is the efficiency of Carnot engine?
Ideal Maximum EfficiencyWhat is the unit of thermal conductivity?
W/m·K
Short Intro (161–180)
Now we shift to light, sound, and wave phenomena. These one-liners test your recall of optical and acoustic principles.
What type of wave is light?
Transverse WaveWhat type of wave is sound?
Longitudinal WaveWhat is the speed of light in a vacuum?
3 × 10⁸ m/sWhat is the speed of sound in air?
343 m/sWhat is reflection of light?
Bouncing back of lightWhat is refraction of light?
Bending of lightWhat is total internal reflection?
Light reflection within a mediumWhat device uses total internal reflection?
Optical FiberWhat is the mirror used by dentists?
Concave MirrorWhat type of lens is used to correct myopia?
Concave LensWhat type of lens is used to correct hypermetropia?
Convex LensWhat is the unit of focal length?
MeterWhat is the point where parallel rays meet after reflection?
FocusWhat is the phenomenon of splitting of light called?
DispersionWhat forms a rainbow?
Dispersion of LightWhat is the instrument used to see distant objects?
TelescopeWhat is the instrument used to view very small objects?
MicroscopeWhat is the mirror formula?
1/f = 1/v + 1/uWhat color has the shortest wavelength?
VioletWhat color has the longest wavelength?
Red
Short Intro (181–200)
This final part focuses on electricity and magnetism. These one-liners help you revise definitions, units, and laws quickly.
What is the SI unit of electric current?
AmpereWhat is the SI unit of charge?
CoulombWhat is the SI unit of potential difference?
VoltWhat is Ohm’s Law?
V = IRWhat is the SI unit of resistance?
OhmWho discovered current electricity?
Alessandro VoltaWhat is the device used to measure electric current?
AmmeterWhat measures voltage?
VoltmeterWhat restricts the flow of current?
ResistorWhat is the power formula in electric circuits?
P = VIWhat is the device that stores electric charge?
CapacitorWhat is the unit of capacitance?
FaradWhat is alternating current?
Current that changes directionWhat is direct current?
Current that flows in one directionWhat is the frequency of AC in Pakistan?
50 HzWhat is the device that converts AC to DC?
RectifierWhat device converts DC to AC?
InverterWhat is electromagnetism?
Magnetism produced by electric currentWho discovered electromagnetism?
Hans Christian OerstedWhat is the SI unit of magnetic field strength?
Tesla
(201–220)
This set continues exploring magnetism, induction, and modern physics. These are high-frequency areas for CSS, PMS, FPSC, and engineering tests — concise, exam-ready facts.
What is a magnet?
A material that attracts iron and produces a magnetic fieldWhat is the north-seeking pole called?
North PoleWhat is the south-seeking pole called?
South PoleWhat is the region around a magnet where force acts called?
Magnetic FieldWhat lines represent a magnetic field?
Magnetic Field LinesWhat happens when like poles are brought close?
They repelWhat happens when unlike poles are brought close?
They attractWho discovered electromagnetic induction?
Michael FaradayWhat law explains electromagnetic induction?
Faraday’s LawWhat is Lenz’s Law?
Induced current opposes the change that produced itWhat is a transformer used for?
Changing voltage of ACWhat type of current does a transformer work on?
Alternating Current (AC)What is a generator used for?
Converting mechanical energy into electrical energyWhat is an electric motor used for?
Converting electrical energy into mechanical energyWhat is the working principle of a motor?
Motor effectWhat is the working principle of a generator?
Electromagnetic InductionWhat type of core is used in transformers?
Soft Iron CoreWhat is mutual induction?
Induction between two coilsWhat is self-induction?
Induction within the same coilWhat is eddy current?
Current induced in a conductor due to changing magnetic field
Short Intro (221–240)
This section covers atomic, nuclear, and particle physics. These one-liners help you retain key discoveries, scientists, and basic atomic facts.
Who discovered the electron?
J.J. ThomsonWho discovered the proton?
Ernest RutherfordWho discovered the neutron?
James ChadwickWhat is the center of an atom called?
NucleusWhat are the charged particles in an atom?
Protons and ElectronsWhat is the charge of an electron?
NegativeWhat is the charge of a proton?
PositiveWhat is the charge of a neutron?
NeutralWho proposed the planetary model of atom?
RutherfordWho proposed the atomic model with energy levels?
Niels BohrWhat are isotopes?
Atoms with same atomic number but different mass numberWhat is radioactivity?
Spontaneous emission of radiations from unstable nucleiWho discovered radioactivity?
Henri BecquerelWhat are the three types of radioactive radiations?
Alpha, Beta, GammaWho discovered artificial radioactivity?
Irene Curie and Joliot CurieWhat is half-life?
Time required for half of radioactive atoms to decayWhat is nuclear fission?
Splitting of heavy nucleus into smaller nucleiWhat is nuclear fusion?
Combining of light nuclei to form heavier nucleusWhat element is used as fuel in nuclear reactors?
UraniumWhat gas is produced in hydrogen bomb?
Helium
Short Intro (241–260)
This section strengthens your understanding of modern physics and quantum mechanics. These questions focus on foundational discoveries and applications.
What is photoelectric effect?
Emission of electrons from metal surface when light falls on itWho explained the photoelectric effect?
Albert EinsteinWhat particle carries light energy?
PhotonWhat is the energy of a photon given by?
E = hfWhat is Planck’s constant symbol?
hWhat is the value of Planck’s constant?
6.626 × 10⁻³⁴ JsWhat is quantum theory related to?
Energy quantizationWho proposed the quantum theory?
Max PlanckWhat is dual nature of light?
Behaves as both wave and particleWhat is X-ray?
High-energy electromagnetic radiationWho discovered X-rays?
Wilhelm RoentgenWhat is the use of X-rays?
Medical imagingWhat is laser light?
Coherent and monochromatic lightWhat does LASER stand for?
Light Amplification by Stimulated Emission of RadiationWho developed the first laser?
Theodore MaimanWhat is holography?
3D image formation using laserWhat is semiconductor?
Material with conductivity between conductor and insulatorWhat are examples of semiconductors?
Silicon and GermaniumWhat is diode used for?
RectificationWhat is transistor used for?
Amplification and Switching
Short Intro (261–280)
These one-liners test your recall on electronic devices and communication systems — concise and exam-oriented for modern test prep.
What is a rectifier?
Converts AC to DCWhat is an oscillator?
Generates alternating current signalWhat is modulation?
Superimposing message signal on carrier waveWhat are the main types of modulation?
AM, FM, PMWhat is AM in communication?
Amplitude ModulationWhat is FM in communication?
Frequency ModulationWhat is PM in communication?
Phase ModulationWhat is bandwidth?
Range of frequencies transmittedWhat is antenna used for?
Transmission and reception of radio wavesWhat is radar used for?
Detecting direction and distance of objectsWhat is SONAR used for?
Detecting underwater objectsWhat is the full form of SONAR?
Sound Navigation and RangingWhat type of waves are used in microwave ovens?
MicrowavesWhat is the speed of radio waves?
Equal to speed of lightWhat is infrared radiation used for?
Night vision and remote controlsWhat radiation is used in sterilization?
Ultraviolet RaysWhat is the main component of optical fiber communication?
Total Internal ReflectionWhat does GPS stand for?
Global Positioning SystemWhat is satellite communication used for?
Long-distance transmissionWhat type of orbit do communication satellites use?
Geostationary Orbit
Short Intro (281–300)
This final set covers units, measurements, and constants — essential for precision-based MCQs in entry tests and FPSC-style exams.
What is the SI base unit of time?
SecondWhat is the SI base unit of length?
MeterWhat is the SI base unit of mass?
KilogramWhat is the SI unit of frequency?
HertzWhat is the SI unit of charge?
CoulombWhat is the SI unit of potential difference?
VoltWhat is the SI unit of power?
WattWhat is the SI unit of work?
JouleWhat is the SI unit of temperature?
KelvinWhat is the SI unit of luminous intensity?
CandelaWhat is the SI unit of amount of substance?
MoleWhat is the value of acceleration due to gravity?
9.8 m/s²What is the speed of sound in air?
343 m/sWhat is the speed of light in vacuum?
3 × 10⁸ m/sWhat is Avogadro’s number?
6.022 × 10²³What is the charge of one electron?
–1.6 × 10⁻¹⁹ CWhat is Boltzmann constant?
1.38 × 10⁻²³ J/KWhat is Stefan’s constant symbol?
σWhat is the value of gravitational constant G?
6.67 × 10⁻¹¹ Nm²/kg²What is the universal law of gravitation formula?
F = G(m₁m₂)/r²