Welcome to your Thermal Properties and Processes - Expansivity, Heat Transfer(Senior Class Physics Study by Topics) NAME EMAIL PHONE NUMBER 1. Temperatures of two stars are in ratio 3:2. If wavelength of maximum intensity of first body is 4000 Å, what is corresponding wavelength of second body?9000 Å6000 Å8000 Å2000 Å2. Why is the roof of buildings painted whiteBecause it conducts heatBecause it reflects radiationsBecause it is cheaperBecause it absorbs radiation3. 540g of ice at 0°C is mixed with 540g of water at 80°C. What is the final temperature of the mixture?Less than 0°80°C0°C40°C4. A piece of blue glass heated to a high temperature and a piece of red glass at room temperature, are taken inside a room that is dimly lit, then ___________Red looks brighter and blue looks ordinary blueThe blue piece will look blue and red will look as usualBlue shines like brighter red compared to the red piecesBoth the pieces will look equally red5. Which term is used to define the temperature at which a substance changes its status from solid to liquid?Melting pointBoiling pointFreezing pointCondensation point6. Which of the following is an effective coolant?OilMecuryAcidsWater7. A block of copper weighs 3.0 kg. Copper has a specific heat capacity of 390 J kg-1K-1. It is cooled in the freezer so that the temperature drops from 25.0oC to 0.0oC. What is the total energy lost by the block of copper?32950 J22950 J29250 J23400 J8. What is the SI unit of specific heat capacity?J/kgJkg/KJK/kgJ/(kgK)9. The energy due to which the molecules held at a fixed position vibrate, this energy is termed asinternal energyphysical energyexternal energychemical energy10. The temperature of a body can be negative on the Kelvin scale.FalseTrue11. The temperature at which plastics begin to become softer and defer under a load is known as _________Melting pointSoftening pointHeat distortion pointEutectic point12. A milkman boils the milk before distributing it in the pots. He raises the temperature of the milk from 10 °C to 130 °C with the thermal energy of 120000 J. If the mass of the milk is 25 kg, the specific heat capacity of the milk would be120 J kg -1 °C-140 J kg -1 °C-180 J kg -1 °C-1160 J kg -1 °C-113. The ability of a body to withstand sudden and severe temperature changes is known as________Thermal transmittanceDeploymentThermal shock resistanceThermal resistance14. Internal energy isThe average molecular kinetic energy and average molecular potential energy of a bodyThe sum of molecular kinetic energy and molecular potential energy of a bodyThermal energy that a body possessesThe sum of kinetic energy and potential energy of a body15. The melting point of Iron (Fe) is _________419°C1538°C1084°C660°C16. The internal energy comprises of two types of energies, those arekinetic and potential energymechanical and electrical energykinetic and magnetic energymagnetic and electrical energy17. An ideal black body is thrown into a furnace. The black body is room temperature. It is observed that _______Initially, it is darkest body and at later times the brightestIt cannot be distinguished at all timesAt all times it is the darkest bodyInitially, it is the darkest body and at later it cannot be distinguished18. In an experiment, 100 g of liquid requires 12600 J of thermal energy to raise it from 30 °C to 60 °C, the thermal capacity of 100 g of water is420 J K-1300 J K300 J K-1420 J K19. Temperature is a microscopic concept.TrueFalse20. A pure substance would freeze or solidify at itsmelting pointsublimation pointboiling pointcondensation point21. A composite rod made of copper (1.8×10(-5) K(-1)) and steel (α=1.2×10(-5) K(-1)) is heated. Then _____Data is insufficientIt bends with steel on concave sideIt bends with copper on concave sideIt does not expand22. What happens when a material is heated?It meltsIt burstsIt contractsIt expands23. What effect does the addition of thermal energy have on a material?ReproductionThermal expansionNo changeThermal contraction24. If the sun were to increase in temperature from T to 2T and its radius from R to 2R, then the ratio of the radiant energy received on earth to what it was previously, will be _______163264425. Calorie is defined as the amount of heat required to raise the temperature of 1g of water by 1°C and it is defined under which of the following conditions?From 14.5°C to 15.5°C at 760mm of HgFrom 98.5°C to 99.5°C at 760mm of HgFrom 3.5°C to 4.5°C at 76mm of HgFrom 13.5°C to 14.5°C at 76mm of Hg26 out of 25Time is Up!