Welcome to your Thermal Properties and Processes - Expansivity, Heat Transfer(Senior Class Physics Study by Topics) NAME EMAIL PHONE NUMBER 1. What happens when a material is heated?It burstsIt meltsIt expandsIt contracts2. The outer ends of two bars A and B are at 100°C and 50° respectively. Calculate the temperature at the welded joint if they have the same cross-section and the same length and their thermal conductivities are in the ratio of A:B = 7:5.20.157°C79.166°C80.548°C58.147°C3. What effect do thermal variations in volume have on a body?ExpansionCrackingPhase transformationContraction4. What is the SI unit of specific heat capacity? J/kgJK/kgJ/(kgK)Jkg/K5. 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 brightestAt all times it is the darkest bodyIt cannot be distinguished at all timesInitially, it is the darkest body and at later it cannot be distinguished6. Specific heat of materials is expressed in terms of __________W/m Km³/kgJ/KJ/kg K7. The melting point of Iron (Fe) is _________1084°C1538°C419°C660°C8. Temperature is a microscopic concept.TrueFalse9. How is the spalling resistance index defined?k/cpPhS/αEP/AαlΔT10. 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 copper on concave sideIt does not expandIt bends with steel on concave side11. Why locations next to large water bodies tend to have a moderate climate than those further inland?Because of the water in cloudsBecause of the latitudeBecause of specific heat of waterBecause of the heating effects of sun12. 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?2000 Å9000 Å6000 Å8000 Å13. When one end of the rod is heated, the molecules at the hot end vibrate with higher amplitude and transmit the heat from one particle to the adjacent particle and so on. What is the process?ConductionRadiationTransmittanceConvection14. The thermometer bulb should have ______No heat capacityVarying heat capacityHigh heat capacitySmall heat capacity15. Solids with weekly bonded electrons are good conductors of heat.TrueFalse16. 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 is300 J K300 J K-1420 J K-1420 J K17. The ability of a body to withstand sudden and severe temperature changes is known as________DeploymentThermal resistanceThermal shock resistanceThermal transmittance18. The temperature of a body can be negative on the Kelvin scale.FalseTrue19. What effect does the addition of thermal energy have on a material?No changeThermal contractionReproductionThermal expansion20. Which of the following is an effective coolant?OilMecuryAcidsWater21. Which term is used to define the temperature at which a substance changes its status from solid to liquid?Condensation pointMelting pointBoiling pointFreezing point22. Two thermometers are constructed in the same way except that one has a spherical bulb and the other an elongated cylindrical bulb. Which of the two will respond quickly to temperature changes?Elongated cylindrical bulbAll of the mentionedNone of the mentionedSpherical bulb23. 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?22950 J23400 J32950 J29250 J24. 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 blueBoth the pieces will look equally redThe blue piece will look blue and red will look as usualBlue shines like brighter red compared to the red pieces25. When the state is being changes from gas to liquid through the process of condensation, the temperatureremains constantdecreasesincreasesmay increase or decrease26 out of 25Time is Up!