28/03/2020 Thermal Properties and Processes – Expansivity, Heat Transfer(Senior Class Physics Study by Topics) 0Comments by Gate Academy Welcome to your Thermal Properties and Processes - Expansivity, Heat Transfer(Senior Class Physics Study by Topics) NAME EMAIL PHONE NUMBER 1. The internal energy comprises of two types of energies, those arekinetic and potential energymechanical and electrical energykinetic and magnetic energymagnetic and electrical energy2. The specific heat capacity of a pure substance Is always changing as the temperature increasesIs a fixed valueDepends on its structureDoes not depend on the purity of the substance3. What happens when a material is heated?It meltsIt burstsIt contractsIt expands4. In an isochoric process, the internal energy of a system decreases by 50 J. What is the heat exchange?ZeroNone of the above-50 J50 J5. The amount of energy required to change the liquid to gas and vice versa without any change in temperature is termed asHeat CapacityLatent Heat of FusionSpecific Heat CapacityLatent Heat of Vaporization6. 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 bulbNone of the mentionedSpherical bulbAll of the mentioned7. An ideal black body is thrown into a furnace. The black body is room temperature. It is observed that _______At all times it is the darkest bodyInitially, it is darkest body and at later times the brightestInitially, it is the darkest body and at later it cannot be distinguishedIt cannot be distinguished at all times8. The temperature of a body can be negative on the Kelvin scale.FalseTrue9. How is the spalling resistance index defined?k/cpPhS/αEP/AαlΔT10. Why locations next to large water bodies tend to have a moderate climate than those further inland?Because of specific heat of waterBecause of the water in cloudsBecause of the heating effects of sunBecause of the latitude11. A green glass heated in a furnace when taken out in dark glows red.TrueFalse12. Which term is used to define the temperature at which a substance changes its status from solid to liquid?Melting pointBoiling pointFreezing pointCondensation point13. When the state is being changes from gas to liquid through the process of condensation, the temperaturedecreasesincreasesremains constantmay increase or decrease14. Temperature is a microscopic concept.FalseTrue15. The heat capacity of a material defined as ___________C = m . dE/dTC = dT/dQC = 1/m . dE/dTC = dQ/dT16. The ability of a body to withstand sudden and severe temperature changes is known as________Thermal resistanceThermal transmittanceThermal shock resistanceDeployment17. 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?8000 Å6000 Å2000 Å9000 Å18. The energy due to which the molecules held at a fixed position vibrate, this energy is termed aschemical energyphysical energyinternal energyexternal energy19. The temperature at which plastics begin to become softer and defer under a load is known as _________Melting pointEutectic pointHeat distortion pointSoftening point20. 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 ___________Both the pieces will look equally redRed looks brighter and blue looks ordinary blueBlue shines like brighter red compared to the red piecesThe blue piece will look blue and red will look as usual21. Which of the following is an effective coolant?WaterAcidsOilMecury22. A composite rod made of copper (1.8×10(-5) K(-1)) and steel (α=1.2×10(-5) K(-1)) is heated. Then _____It bends with steel on concave sideIt bends with copper on concave sideIt does not expandData is insufficient23. 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 K-1420 J K300 J K420 J K-124. What is the SI unit of specific heat capacity? JK/kgJ/(kgK)Jkg/KJ/kg25. When you hang your t-shirt or jeans on a rope to dry it out, it dries fast even if there is no sun, this is due tocondensing of the duedorentevaporation of the liquidmelting of the liquidboiling of the perfume26 out of 25Time is Up! Time's up
