What is the unit of force?NewtonWattPascalNewtonThe unit of force in the SI system is Newton, named after Sir Isaac Newton.
Which of the following is a scalar quantity?VelocityAccelerationTemperatureTemperatureScalar quantities have magnitude only. Temperature is scalar, while the others are vectors.
What is the speed of light in a vacuum?3 × 10⁸ m/s3 × 10⁷ m/s3 × 10⁵ m/s3 × 10⁸ m/s Light travels at approximately 300,000,000 meters per second in a vacuum.
Which law explains the relationship between pressure and volume of a gas? Newton's LawOhm’s LawHooke's Law Boyle's LawBoyle’s Law states that pressure and volume of a gas are inversely proportional at constant temperature.
What device is used to measure current?BarometerAmmeterThermometerAmmeterAmmeter is specifically designed to measure electric current in a circuit.
Who proposed the three laws of motion?NewtonGalileoFaradayNewtonSir Isaac Newton formulated the three fundamental laws of motion.
What is the unit of electric power?OhmAmpereVoltWattWatt is the SI unit of power, representing energy per unit time.
Which phenomenon explains the bending of light when it passes from one medium to another?RefractionDiffractionDispersionRefractionRefraction is the bending of light due to a change in its speed in different media.
What type of mirror is used in car headlights?Concave mirrorConvex mirrorNone of theseConcave mirrorConcave mirrors focus light rays to a point, making them ideal for headlights.
Which instrument measures atmospheric pressure?ThermometerBarometerAnemometerBarometerA barometer is used to measure atmospheric pressure, important in weather forecasting.
What is the acceleration due to gravity on Earth?9.8 m/s²10.8 m/s²11.8 m/s²9.8 m/s²Earth's standard gravity is 9.8 meters per second squared.
What does a convex lens do to light rays?Diverges themConverges themAbsorbs them Converges themConvex lenses bring parallel rays of light to a single focal point.
Which physical quantity is measured in Ohms?CurrentResistancePowerResistanceOhm is the SI unit of electrical resistance.
What kind of energy is stored in a stretched spring?Nuclear energyPotential energyThermal energyPotential energyA stretched spring stores potential energy due to its position.
Which of the following is NOT a renewable source of energy?WindCoalHydroCoalCoal is a fossil fuel and non-renewable.
Which color of light has the shortest wavelength?GreenBlueVioletViolet Violet light has the shortest wavelength and highest frequency.
Which fundamental force is responsible for the structure of the atom?ElectromagneticStrong nuclearWeak nuclearElectromagneticElectromagnetic force binds electrons to the nucleus in an atom.
What is the SI unit of work?JouleNewtonPascalJouleWork is the product of force and displacement, measured in joules.
Who discovered the law of electromagnetic induction?OhmFaradayMaxwellFaradayMichael Faraday discovered how changing magnetic fields produce electric current.
Which part of the atom has a negative charge?NeutronNucleusElectronElectron Electrons carry a negative charge and orbit the nucleus.
What is the function of a transformer? Increase/decrease voltageMeasure resistanceStore energyIncrease/decrease voltageA transformer changes the voltage level in AC circuits.
Which phenomenon causes the sky to appear blue?ReflectionScatteringDiffractionScatteringBlue light is scattered more by the atmosphere due to its shorter wavelength.
What is the principle behind hydraulic brakes?Newton’s Second LawArchimedes’ Principle Boyle’s LawPascal’s LawPascal’s Law states pressure is transmitted equally in a fluid.
What does a voltmeter measure?PowerVoltageCurrentVoltage A voltmeter measures the electric potential difference between two points.
What type of motion is exhibited by a pendulum?RotationalVibrationalOscillatoryOscillatoryA pendulum swings back and forth in an oscillatory motion.
What does E = mc² represent?WorkEnergy-mass equivalenceVelocity Energy-mass equivalenceEinstein's formula shows that mass can be converted into energy.
Which of these is a non-contact force?TensionGravityNormalGravityGravity acts without physical contact.
What is the primary energy source of the Sun?Combustion Nuclear fissionNuclear fusionNuclear fusionThe Sun produces energy through fusion of hydrogen nuclei into helium.
Which wave is used in TV remote controls?InfraredX-rays UV raysInfraredInfrared signals are used in remote control communications.
What happens when light passes through a prism?It reflectsIt scattersIt disperses It disperses A prism separates light into its component colors due to different refractive indices.
What is the unit of frequency?HertzNewtonPascalHertz Frequency is measured in Hertz (Hz), which means cycles per second.
Which gas is filled in electric bulbs?HeliumNitrogenArgonArgonArgon is used in bulbs to prevent the filament from oxidizing.
What type of image is formed by a plane mirror?Virtual and uprightReal and uprightVirtual and invertedVirtual and uprightPlane mirrors always form virtual, upright images of the same size.
Which of the following is the best conductor of electricity?CopperWoodPlasticCopper Copper has low resistance and is widely used in electrical wiring.
What is the cause of tides on Earth?EarthquakeMoon’s gravitational pullOcean currentsMoon’s gravitational pullTides are caused mainly by the gravitational pull of the Moon.
What is the function of a fuse in an electric circuit?To measure currentTo prevent overloading To convert energyTo prevent overloading: A fuse breaks the circuit if current exceeds safe levels.
What is the kinetic energy of a body dependent on?Velocity onlyMass and velocityShape and sizeMass and velocity Kinetic energy = ½mv², depends on both mass and speed. Kinetic energy = ½mv², depends on both mass and speed.
What is the boiling point of water in Celsius? 90°C 100°C110°C 100°CWater boils at 100 degrees Celsius at standard atmospheric pressure.
Which mirror is used for side view in vehicles?) ConcaveConvexNoneConvex Convex mirrors give a wider field of view, ideal for side mirrors.
What does a battery convert? Electrical to chemical energyChemical to electrical energyHeat to mechanical energyChemical to electrical energyBatteries convert stored chemical energy into electrical energy.
What is the name of the force that opposes motion?FrictionGravity NormalFriction Friction opposes the motion between two surfaces in contact.
What happens to resistance if the length of a wire is increased?IncreasesRemains sameDoublesIncreasesResistance is directly proportional to the length of the wire.
What is used to measure temperature?ThermometerAmmeter AltimeterThermometerA thermometer measures temperature.
What is sound above 20,000 Hz called? InfrasoundUltrasound Sonic boomUltrasound Ultrasound refers to sound waves with frequencies above human hearing.
What is the primary function of a capacitor? To store electric chargeTo convert current To block current To store electric charge A capacitor stores and releases electric charge in a circuit.
What is measured in decibels (dB)?Light intensity Sound intensity Resistance Sound intensity Decibels measure the intensity or loudness of sound.
Which of the following can travel through a vacuum?LightHeat (by conduction) NoneLight Light can travel through the vacuum of space, unlike sound.
What kind of waves are radio waves?Transverse mechanical wavesElectromagnetic wavesLongitudinal wavesElectromagnetic waves Radio waves are part of the electromagnetic spectrum.
What is Hooke’s Law related to? GasesElasticityGravityElasticityHooke’s Law describes the relationship between force and extension in springs.
Which is the weakest force in nature?Weak nuclearElectromagnetic Gravitational GravitationalThough it has infinite range, gravity is the weakest of the four fundamental forces.
In which direction does heat flow?Hot to coldRandom Sideways onlyHot to coldHeat always flows from a region of higher temperature to a region of lower temperature.
Which metal is most commonly used in thermometers?IronMercuryCopperMercuryMercury is used due to its uniform expansion and visibility.
Which type of lens is used to correct myopia?Concave lensCylindrical lens NoneConcave lensA concave lens helps in focusing light properly on the retina in myopic eyes.
Which of the following is a vector quantityWhich of the following is a vector quantity??Distance) DisplacementTime) DisplacementDisplacement has both magnitude and direction, making it a vector.
Which energy conversion takes place in a solar panel? Chemical to thermalSolar to electricalSolar to mechanicalSolar to electricalSolar panels convert sunlight directly into electricity.
What is inertia?Tendency to moveResistance to change in motionAccelerationResistance to change in motion Inertia is the tendency of an object to resist a change in its state of motion.
What does a spectrometer measure?Frequency of sound Properties of light spectrumMass Properties of light spectrumA spectrometer is used to analyze light and determine its spectrum.
Which of these is not a unit of energy? CalorieNewtonKilowatt-hourNewtonNewton is a unit of force, not energy.
What is a diode used for in circuits? To allow current in one directionTo generate powerTo block light To allow current in one directionA diode conducts electricity in only one direction, useful for rectification.
What is the shape of the path of a projectile under gravity?Parabola Straight line EllipseParabolaA projectile moves in a parabolic path due to the influence of gravity.
What does a galvanometer measure?Voltage Small electric currentCapacitance Small electric current A galvanometer is used to detect and measure small currents.
What type of mirror always forms virtual images?ConvexPlaneBoth B and CBoth B and CConvex and plane mirrors always form virtual images.
What is the main function of a resistor in an electric circuit?To reduce current To store chargeTo increase voltageTo reduce currentA resistor limits or regulates the flow of electrical current.
Which of the following is a form of kinetic energy?Rock at hilltop Moving carStretched rubber band Moving car: Kinetic energy is the energy of motion; a moving car has it.
What is the unit of pressure?WattNewtonPascalPascal Pressure is force per unit area, and its unit is Pascal.
What is the main principle of a rocket?Newton’s Second LawNewton’s Third LawArchimedes' PrincipleNewton’s Third LawA rocket operates on action-reaction force (every action has equal and opposite reaction).
Which electromagnetic wave has the shortest wavelength? Gamma raysX-raysInfrared Gamma raysGamma rays have the shortest wavelength and highest frequency.
What is the source of geothermal energy?What is the source of geothermal energy?Ocean waves Earth’s internal heat Wind Earth’s internal heatGeothermal energy comes from heat stored inside the Earth.
What is the refractive index of a medium?Ratio of light wavelength in medium to vacuum Ratio of energy to massRatio of pressure to areaRatio of light speed in vacuum to that in medium It tells how much the light slows down in a medium.
Which instrument detects earthquakes?SeismographAnemometer BarometerSeismographA seismograph detects and records the intensity of earthquakes.
Which material is most elastic? SteelRubberCopper SteelSteel returns to its original shape most efficiently, indicating high elasticity.
What is the angle of incidence equal to in reflection? Angle of refractionAngle of emergenceAngle of reflectionAngle of reflectionAccording to the law of reflection, these two angles are always equal.
What is the freezing point of water in Fahrenheit? 32°F100°F212°F 32°FWater freezes at 32 degrees Fahrenheit.
What does Ohm’s Law state? F = maP = VI E = mc²V = IROhm’s Law relates voltage (V), current (I), and resistance (R).
Which device converts sound into electrical signals?MicrophoneAmplifierResistorMicrophoneA microphone converts sound waves into electrical signals.
What kind of image does a concave mirror form when the object is far away? Real and invertedReal and uprightVirtual and upright Real and invertedConcave mirrors form real, inverted images for distant objects.
What happens to the volume of a gas if pressure is increased at constant temperature?Decreases Remains the sameDoublesDecreasesBoyle’s Law: Pressure and volume are inversely proportional.
Which quantity is conserved in all physical and chemical changes?TemperatureVolumeDensityEnergyLaw of conservation of energy states energy cannot be created or destroyed.
What is the direction of magnetic field around a current-carrying wire?Straight line RandomDiagonalCircular Magnetic field lines form concentric circles around the wire.
Which instrument is used to measure potential difference?AmmeterThermometerGalvanometerVoltmeter A voltmeter measures the potential difference across two points.
What happens when a sound wave hits a wall?RefractedAbsorbedAll of the aboveAll of the above Depending on the surface, sound can be reflected, refracted, or absorbed.
What is the function of a prism in optics?Store energySplit lightBlock lightSplit light A prism disperses white light into its spectrum.
Which gas is used in refrigerators?Nitrogen AmmoniaCarbon dioxide Ammonia Ammonia is commonly used as a refrigerant.
What is the relation between frequency and wavelength?Inversely proportionalNo relationEqualInversely proportionalAs frequency increases, wavelength decreases and vice versa.
What is a wave? Particles in motionElectric charge HeatEnergy traveling through matter A wave is a disturbance that transfers energy through a medium or space.
What is the sound speed in air at room temperature? 340 m/s 500 m/s1000 m/s 340 m/sSound travels at approximately 340 meters per second in air.
Which type of waves are light waves? MechanicalElectromagnetic SoundElectromagnetic Light waves are electromagnetic and can travel in a vacuum.
What causes a rainbow?Refraction DispersionAll of the aboveAll of the above Rainbows are formed due to refraction, reflection, and dispersion of light.
What kind of energy is possessed by a moving fan?Potential energy Thermal energy Chemical energyKinetic energy A fan in motion possesses kinetic energy.
What is an electric circuit?A wireA magnet A switchA closed path for electric currentA circuit allows electricity to flow in a loop.
What is the unit of electric charge?CoulombVoltOhmCoulombCoulomb is the SI unit of electric charge.
What is a light-year?Speed of lightDistance light travels in a yearAge of the sunDistance light travels in a yearA light-year measures astronomical distances.
What is the law of conservation of momentum?Momentum is created Momentum is constant unless acted uponMomentum only exists in solids Momentum is constant unless acted uponIn a closed system, total momentum remains constant.
What is a neutron’s charge?NegativeZeroVariesZeroNeutrons are neutral particles with no charge.
Which law explains buoyancy?Archimedes' PrincipleHooke’s LawBoyle’s LawArchimedes' Principle It explains how fluids exert an upward force on submerged objects.
Which part of the atom contains the most mass?Nucleus ProtonNeutronNucleusThe nucleus contains protons and neutrons, accounting for most of the atom’s mass.
What is centripetal force?Outward force in circular motionForce pulling towards center in circular motionRandom force Force pulling towards center in circular motionCentripetal force keeps an object moving in a circular path.
What causes lightning?Friction between cloudsEvaporation WindFriction between clouds Lightning is caused by charge buildup from friction between storm clouds.
Which wave property determines pitch?WavelengthFrequencySpeedFrequency Higher frequency results in higher pitch.
What is terminal velocity?Maximum speed of falling objectInitial speedFinal horizontal speedMaximum speed of falling objectTerminal velocity is reached when the force of gravity is balanced by air resistance.
What kind of quantity is force?VectorComplexImaginaryVectorForce has both magnitude and direction, making it a vector quantity.
Which law states that the volume of gas is directly proportional to its temperature at constant pressure?Charles’s LawAvogadro’s LawNewton’s LawCharles’s LawCharles’s Law describes the direct relationship between volume and temperature.
What is the main function of a transformer?Change voltageStore energyConvert AC to DCChange voltageA transformer increases or decreases AC voltage.
What is the unit of magnetic field strength?CoulombNewtonOhmTeslaTesla is the SI unit used to measure magnetic field strength.
Which particle is negatively charged?ElectronNeutronAlpha particleElectron Electrons carry a negative charge.
What happens to a liquid's boiling point at higher altitudes?DecreasesRemains same Becomes zeroDecreasesLower air pressure at high altitudes lowers the boiling point.
What does a capacitor store?CurrentElectric chargeMagnetic fieldElectric chargeCapacitors store electrical energy in the form of charge.
What does a fuse protect in an electric circuit?WireHuman bodyAppliancesAppliances A fuse breaks the circuit in case of excess current, protecting appliances.
What is the SI unit of energy?WattJouleAmpereJouleJoule is the standard unit for measuring energy.
Which of the following is not a vector quantity?SpeedForceDisplacementSpeed Speed has only magnitude, no direction, so it is scalar.
What is the power of a lens measured in?WattsNewtonsAmperesDioptresThe power of a lens is measured in dioptres (D), reciprocal of focal length in meters.
What kind of wave is sound?LongitudinalTransverseGammaLongitudinalSound waves move in the direction of vibration, making them longitudinal.
Who gave the laws of motion?ArchimedesNewtonEinsteinNewtonSir Isaac Newton formulated the three laws of motion.
What is inertia?Resistance to change in motionForceAccelerationResistance to change in motionInertia is the property of matter to resist change in its state of motion.
What is the unit of frequency?NewtonPascalJouleHertzHertz (Hz) is the unit of frequency, measuring cycles per second.
What causes tides on Earth?Sun’s gravityMoon’s gravityOcean currentsMoon’s gravityTides are mainly caused by the gravitational pull of the moon.
Which wave travels fastest?WaterLightEarthquakeLight Light is the fastest wave, traveling at about 300,000 km/s in vacuum.
What is a simple machine? Device that reduces timeDevice that makes work easierDevice that produces energyDevice that makes work easierSimple machines help in doing work with less effort.
Which of these is not a simple machine?LeverScrewMotorMotorA motor is a complex machine, not a simple one.
What is the shape of the path of a projectile?EllipseParabolaStraight lineParabolaThe trajectory of a projectile is a curved path called a parabola.
What is the acceleration due to gravity on Earth?10.8 m/s²9.8 m/s²9.2 m/s²9.8 m/s²On Earth’s surface, the standard acceleration due to gravity is 9.8 meters per second squared.
What is the direction of centripetal force?Toward the centerDownwardDownwardToward the centerCentripetal force acts towards the center of the circular path.
Who invented the electric bulb?Alexander BellThomas EdisonMichael FaradayThomas Edison Edison is credited with inventing the practical electric bulb.
What kind of energy is stored in a stretched rubber band?Potential energyThermal energy Sound energyPotential energyThe stretched band stores elastic potential energy.
What causes the greenhouse effect?Carbon dioxideHydrogenNitrogenCarbon dioxideCO₂ traps heat in the atmosphere, causing the greenhouse effect.
What is the unit of electric power?AmpereVoltWattWattPower is the rate at which energy is used, measured in watts.
What color has the shortest wavelength in visible light?YellowBlueVioletVioletViolet light has the shortest wavelength and highest energy.
What is the phenomenon behind the working of an optical fiber?RefractionTotal internal reflectionDiffractionTotal internal reflectionLight is trapped and guided through optical fibers by total internal reflection.
What type of mirror is used in vehicles as rearview mirrors?ConcaveConvexCylindricalConvexConvex mirrors provide a wider field of view.
What is the primary source of the sun’s energy?Nuclear fusionNuclear fissionChemical reactionNuclear fusionThe sun produces energy by fusing hydrogen into helium.
What kind of motion is circular motion?OscillatoryPeriodicRectilinearPeriodicCircular motion repeats in regular intervals, making it periodic.
What is displacement?Path length Shortest distance between start and endForce Shortest distance between start and endDisplacement is a vector quantity representing shortest distance and direction.
What type of energy is used by solar panels?Chemical energy Light energyMechanical energy Light energySolar panels convert sunlight into electrical energy.
What is the main function of a battery?To store mechanical energy To store and supply electric energyTo heat the circuit To store and supply electric energyBatteries convert chemical energy into electrical energy.
What is the melting point of ice in Celsius?0°C 32°C100°C0°C Ice melts at 0 degrees Celsius under standard pressure.
What kind of lens is used to correct farsightedness?ConcavePlaneCylindricalConvexConvex lenses converge light rays and help with farsightedness.
What is the role of control rods in a nuclear reactor? Absorb neutronsCool the systemReflect radiation Absorb neutronsControl rods regulate the fission process by absorbing excess neutrons.
What device converts DC to AC?GeneratorInverterTransformerInverterInverters convert direct current into alternating current.
What does a barometer measure?PressureHumidityRainfallPressure A barometer is used to measure atmospheric pressure.
What is the property of a material to regain its shape after deformation?ElasticityDensityViscosityElasticity Elasticity is the ability to return to original shape after stress is removed
What is the unit of electric charge?CoulombAmpereOhmCoulombThe standard unit for electric charge is the coulomb.
What is Ohm’s Law? F = maP = IVE = mc² V = IROhm’s Law relates voltage (V), current (I), and resistance (R).
What is the shape of magnetic field lines around a bar magnet?CircularClosed loopsEllipticalClosed loops Magnetic field lines form closed loops from north to south outside the magnet.
What is a scalar quantity among these?VelocityWorkAccelerationWorkWork is scalar because it has magnitude only, no direction.
Which physical quantity does the unit 'pascal' represent?PressureForceWorkPressurePressure is measured in pascals (Pa), which is N/m².
What happens to current if resistance increases and voltage remains constant?DecreasesRemains sameDoublesDecreasesAccording to Ohm’s Law, I = V/R, so current decreases as resistance increases.
What kind of lens is used in a magnifying glass?ConcavePlaneCylindricalConvexConvex lenses converge light rays and magnify images.
What is the SI unit of temperature?KelvinFahrenheitJouleKelvinKelvin (K) is the SI unit for measuring temperature.
What is the nature of light?Particle only Both wave and particle Neither wave nor particle Both wave and particle Light exhibits dual nature, showing wave-like and particle-like behavior.
What is frequency?Energy of waveNumber of cycles per second Direction of waveNumber of cycles per secondFrequency is the count of wave cycles in one second, measured in hertz.
What does the slope of a distance-time graph represent?SpeedForceWorkSpeedThe slope of a distance-time graph gives the speed of the object.
Which device is used to measure electric current?AmmeterGalvanometerThermometerAmmeter An ammeter measures current flowing through a circuit.
What is kinetic energy?Energy of motionHeat energyStored energyEnergy of motionKinetic energy is the energy an object has due to motion.
What is the role of a commutator in a DC motor?Converts AC to DCReverses current directionStores energyReverses current direction The commutator reverses current direction to maintain rotation.
What is latent heat?Heat causing temperature riseHeat produced by frictionHeat due to radiationHeat at constant temperature Latent heat is absorbed or released during a phase change without temperature change.
What causes seasons on Earth?Earth’s tilt and revolutionEarth's rotation onlySun's distanceEarth’s tilt and revolutionSeasons result from the Earth's axial tilt and its orbit around the Sun.
What is the time period of a pendulum?Speed of swingNumber of swingsDistance coveredTime for one complete swingTime period is the time taken for one full oscillation.
What property makes metals good conductors? Dense nucleiMagnetic natureHigh melting pointFree electronsFree electrons in metals allow electricity to pass easily.
What is the function of an insulator?Generates electricityBlocks electric flowConverts energyBlocks electric flow Insulators prevent the flow of electric current.
What is the symbol for resistance in an electric circuit?PIVRResistance is denoted by R and measured in ohms (Ω).
What happens when a body falls freely from a height?It accelerates uniformly It decelerates It stops at a certain pointIt accelerates uniformlyIn free fall, a body accelerates at a constant rate due to gravity.
Which of the following is the unit of force?WattNewtonJouleNewtonThe SI unit of force is the newton (N).
What type of waves are light waves?Transverse wavesMechanical wavesElectromagnetic wavesTransverse wavesLight waves are transverse, meaning their vibrations are perpendicular to the direction of wave travel.
Which of the following is not a fundamental force?Electromagnetic forceStrong nuclear force Frictional force Frictional forceFriction is not a fundamental force, but rather a result of other forces.
What is the phenomenon when light bends as it passes from one medium to another?RefractionDiffractionDispersionRefraction Refraction occurs when light changes direction due to a change in speed as it passes through different media.
What is the source of most of the Sun's energy?Chemical reactionsNuclear fusionElectric energyNuclear fusionThe Sun’s energy comes from nuclear fusion, where hydrogen nuclei fuse to form helium.
What is the primary purpose of a lens?To refract light and form an image To transmit heat To reflect lightTo refract light and form an imageLenses bend light to focus it and form images.
What is the cause of tides on Earth?Earth’s revolution around the SunThe Moon's gravitational pull Earth's magnetic fieldThe Moon's gravitational pullThe Moon’s gravity pulls on Earth’s oceans, creating tides.
What does the principle of conservation of energy state?Energy can be converted into matterTotal energy remains constantEnergy is proportional to massTotal energy remains constantEnergy cannot be created or destroyed; it can only be transformed from one form to another.
Which of the following is the unit of electric potential difference?VoltOhmJouleVolt The unit of electric potential difference (voltage) is the volt.
What is the angle of reflection? The angle between the reflected ray and the normalThe angle between the incident and reflected raysThe angle between the light ray and the surfaceThe angle between the reflected ray and the normalAccording to the law of reflection, the angle of reflection equals the angle of incidence.
What is the main purpose of a capacitor in an electric circuit?To increase currentTo measure voltageTo control powerTo store and release energy Capacitors store electrical energy and release it when needed.
What happens when the frequency of a wave increases? Its wavelength decreases Its amplitude decreasesIts energy decreases Its wavelength decreases Higher frequency waves have shorter wavelengths, as wave speed remains constant in a medium.
What is the characteristic of an electromagnetic wave?It moves with the speed of soundIt is made of oscillating electric and magnetic fields It only travels in a straight lineIt is made of oscillating electric and magnetic fieldsElectromagnetic waves consist of electric and magnetic fields oscillating perpendicular to each other.
What type of wave is sound?Longitudinal waveTransverse waveGravitational waveLongitudinal waveSound waves are longitudinal, meaning the particles vibrate parallel to the wave’s direction of travel.
What is the SI unit of electric resistance?AmpereOhmVoltOhmThe unit of resistance is the ohm (Ω), named after Georg Simon Ohm.
What is the principle behind the working of a refrigerator?Conversion of energyHeat absorption and transferLatent heat of fusionHeat absorption and transferA refrigerator works by absorbing heat from the inside and transferring it outside.
Which material is an example of a good conductor of electricity?WoodCopperGlassCopperCopper is a highly efficient conductor of electricity.
What is the main cause of energy loss in an electrical circuit?Reflection of energyLack of voltage Energy dissipation through capacitorsHeat loss due to resistanceElectrical energy is lost as heat when current flows through resistive materials.
What phenomenon causes the rainbow?DiffractionReflectionDispersionDispersionA rainbow is caused by the dispersion of light, which splits into its constituent colors when passing through water droplets.
What is the speed of light in a vacuum?3 × 10⁷ m/s1 × 10⁸ m/s 2 × 10⁸ m/s3 × 10⁸ m/sThe speed of light in a vacuum is approximately 3 × 10⁸ meters per second.
What type of motion is exhibited by a freely falling object near the Earth's surface?Uniformly accelerated motionOscillatory motionCircular motionUniformly accelerated motionA freely falling object near the Earth’s surface experiences uniform acceleration due to gravity.
What is the SI unit of force?JouleWattCoulombNewtonThe SI unit of force is the newton (N), defined as the force needed to accelerate 1 kg of mass by 1 m/s²
What kind of wave is a sound wave?Longitudinal waveElectromagnetic waveMechanical waveLongitudinal waveSound waves are longitudinal waves, meaning the particles move in the direction of the wave propagation.
What is the property of a body that resists changes in its motion?InertiaForceMassInertia Inertia is the property of an object that resists changes in its state of motion.
Which of the following is an example of a non-renewable resource?Solar energy Natural gasHydropower Natural gas Natural gas is a non-renewable resource because it is finite and cannot be replenished in a short time.
What is the energy transformation in a hydroelectric power plant?Mechanical to chemicalElectrical to mechanicalPotential to electrical Potential to electrical In a hydroelectric plant, potential energy (due to water stored at a height) is converted into electrical energy.
Which of these waves requires a medium for propagation?Radio wavesSound wavesX-raysSound wavesSound waves are mechanical waves and require a medium (solid, liquid, or gas) to propagate.
What is the unit of frequency?JouleAmpereVoltHertz Frequency is measured in hertz (Hz), representing the number of cycles per second.
What is the term for the time taken by a body to complete one full oscillation?FrequencyPeriodWavelengthPeriod The period is the time it takes for one complete oscillation or cycle of a wave.
What is the SI unit of pressure?PascalWattNewtonPascal Pressure is measured in pascals (Pa), defined as one newton per square meter (N/m²).
What causes the phenomenon of diffraction?RefractionBending of waves around obstacles Change in wave frequencyBending of waves around obstacles Diffraction occurs when waves bend around obstacles or pass through narrow openings.
Which law describes the relationship between the current, voltage, and resistance in a circuit?Coulomb's Law Ohm's LawFaraday's Law Ohm's LawOhm’s Law states that voltage equals the current multiplied by resistance (V = IR).
What happens when an object reaches its terminal velocity?The object stops movingThe object moves at constant velocity The object gains speedThe object moves at constant velocityTerminal velocity occurs when the force of gravity is balanced by the drag force, resulting in constant velocity.
What is the work-energy theorem?Work is the change in an object's kinetic energyEnergy is conserved in a systemEnergy is always equal to massWork is the change in an object's kinetic energyThe work-energy theorem states that the work done on an object is equal to its change in kinetic energy.
What is the process of converting light energy into chemical energy called?PhotosynthesisCombustionFermentationPhotosynthesisPhotosynthesis is the process by which plants convert light energy into chemical energy stored in glucose.
What is the main purpose of a fuse in an electrical circuit?To protect the circuit from overcurrentTo measure voltageTo store electrical energyTo protect the circuit from overcurrentA fuse prevents damage to the circuit by breaking the connection when the current exceeds a safe level.
Which of the following is a vector quantity?DistanceDisplacementEnergyDisplacementDisplacement is a vector quantity because it has both magnitude and direction.
What is the phenomenon of bending light when it passes from one medium to another?RefractionDiffractionAbsorptionRefractionRefraction is the bending of light as it passes from one medium to another with a different density.
What is the force that opposes the motion of objects sliding on a surface?TensionGravitational force Normal forceFrictionFriction is the force that resists the motion of objects sliding or rolling on a surface.
