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 Å 2000 Å 8000 Å 6000 Å None 2. What effect do thermal variations in volume have on a body? Phase transformation Expansion Contraction Cracking None 3. 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 to boiling of the perfume condensing of the duedorent evaporation of the liquid melting of the liquid None 4. A pure substance would freeze or solidify at its condensation point sublimation point boiling point melting point None 5. The response of a material due to the function of heat is known as __________ Mechanical property Thermal property Electrical property Chemical property None 6. 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 J 32950 J 29250 J 23400 J None 7. Solids with weekly bonded electrons are good conductors of heat. False True None 8. When potassium is added to water, it is seen that the lower region becomes warm first and becomes less dense. It then moves up and the more dense cold water comes down and the process goes on. What is the process taking place? Convection Radiation Purification Conduction None 9. Which of the following is an effective coolant? Acids Water Mecury Oil None 10. 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. 58.147°C 80.548°C 79.166°C 20.157°C None 11. A system consists of 3.0 kg of water at 80°C. 30 J of work is done on the system by stirring with a paddle wheel, while 66 J of heat is removed. What is the change in internal energy of the system? -96 J 96 J -36 J 36 J None 12. On a hilly region, water boils at 95°C. What is the temperature expressed in Fahrenheit? 100°F 150°F 20.3°F 203°F None 13. When the first law of thermodynamics, Q = ΔU + W, is applied to an ideal gas that is taken through an isothermal process, None of the above W = 0 Q = 0 ΔU = 0 None 14. 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 ___________ Blue shines like brighter red compared to the red pieces Red looks brighter and blue looks ordinary blue Both the pieces will look equally red The blue piece will look blue and red will look as usual None 15. 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? Transmittance Convection Radiation Conduction None 16. What happens when a material is heated? It expands It contracts It melts It bursts None 17. 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? None of the mentioned All of the mentioned Spherical bulb Elongated cylindrical bulb None 18. The energy due to which the molecules held at a fixed position vibrate, this energy is termed as chemical energy physical energy internal energy external energy None 19. The temperature of a body can be negative on the Kelvin scale. False True None 20. Specific heat of materials is expressed in terms of __________ W/m K m³/kg J/kg K J/K None 21. 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 be 80 J kg -1 °C-1 120 J kg -1 °C-1 40 J kg -1 °C-1 160 J kg -1 °C-1 None 22. The melting point of Iron (Fe) is _________ 1538°C 1084°C 419°C 660°C None 23. 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 98.5°C to 99.5°C at 760mm of Hg From 14.5°C to 15.5°C at 760mm of Hg From 3.5°C to 4.5°C at 76mm of Hg From 13.5°C to 14.5°C at 76mm of Hg None 24. The temperature at which plastics begin to become softer and defer under a load is known as _________ Melting point Eutectic point Softening point Heat distortion point None 25. Compared to burn due to air at 100°C, a burn due to steam at 100°C is _______ More dangerous Less dangerous Equally dangerous Not dangerous None 1 out of 25 Time's upTime is Up!
