1Brownian motion was first observed under a microscope by:aAlbert EinsteinbJ. PerrincRobert BrowndMax PlanckShow answer
2The speed of Brownian motion is inversely proportional to the:aMassbViscositycTemperaturedVolumeShow answer
3Lighter particles undergoing Brownian motion acquire:aLower speedsbGreater speedscZero speeddConstant speedShow answer
4Brownian motion of particles in a fluid is caused by:aGravitational pullbMolecular collisionscElectric forcesdMagnetic forcesShow answer
5Viscosity of a fluid represents its:aDensitybInternal frictioncSurface tensiondThermal conductivityShow answer
6Brownian motion was mathematically explained (in 1905) by:aRobert BrownbIsaac NewtoncAlbert EinsteindMax PlanckShow answer
7Einstein's explanation was experimentally verified by J. Perrin, earning the Nobel Prize in:a1905b1908c1926d1930Show answer
8The speed of Brownian motion is inversely proportional to the _____ of the particle.aChargebSizecColourdTemperatureShow answer
9If the viscosity of the fluid is increased (temperature constant), Brownian motion will:aBecome fasterbBecome slowercRemain unaffecteddStop completelyShow answer
10The zig-zag path traced by a particle undergoing Brownian motion results from:aA single strong impactbContinuous random collisions with fluid moleculescGravity acting alonedElectrostatic repulsionShow answer
11A larger, heavier particle suspended in a fluid shows, compared to a smaller particle:aMore pronounced Brownian motionbLess pronounced Brownian motioncIdentical Brownian motiondNo relation to particle sizeShow answer
12In a liquid at higher temperature, the Brownian motion of suspended particles becomes:aSlowerbFastercUnchangeddImpossibleShow answer
13In thermal physics, we deal with a large number of particles of the order of:aPlanck's constantbAvogadro's number.cSpeed of lightdGravitational constantShow answer
14Which of the following is an application of the kinetic theory of gases in daily life?aAutomobile engines.bElectric motorcOptical fiberdX-ray tubeShow answer
15The particles dealt with in thermal physics can be extended to:aElectrons in metalsbNeutrons in neutron starscAtoms and molecules in gases, liquids, and solidsdAll of the above options.Show answer
16Which of the following devices works on the application of kinetic theory of gases?aGalvanometerbTransformercAir conditionerdCapacitorShow answer
17Thermal physics includes the knowledge of:aNuclear physics and electronicsbStatistical mechanics and kinetic theory of gasescOptics and acousticsdElectromagnetism and fluid dynamicsShow answer
18Who was the botanist that observed the random motion of particles under a microscope?aRobert Brown.bAlbert EinsteincJames Clerk MaxwelldRobert BoyleShow answer
19What is exchanged or transferred during the collision of molecules in a gas?aMass onlybVolume onlycMomentum and energy.dTemperature onlyShow answer
20The speed of the particles in Brownian motion is inversely proportional to which property of the fluid?aTemperaturebViscositycDensitydVolumeShow answer
