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 are kinetic and magnetic energy mechanical and electrical energy magnetic and electrical energy kinetic and potential energy2. The ability of a body to withstand sudden and severe temperature changes is known as________ Deployment Thermal transmittance Thermal resistance Thermal shock resistance3. 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 insufficient It bends with copper on concave side It does not expand It bends with steel on concave side4. A faulty thermometer has its fixed points marked as 5° and 95°. The temperature of a body as measured by the faulty thermometer is 59°. Find the correct temperature of the body on a Celsius scale. 40°C 20°C 0°C 60°C5. 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 120 J kg -1 °C-1 160 J kg -1 °C-1 40 J kg -1 °C-1 80 J kg -1 °C-16. A pure substance would freeze or solidify at its condensation point sublimation point melting point boiling point7. 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? All of the mentioned None of the mentioned Elongated cylindrical bulb Spherical bulb8. 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 J9. On a hilly region, water boils at 95°C. What is the temperature expressed in Fahrenheit? 100°F 203°F 20.3°F 150°F10. Which of the following is an effective coolant? Water Oil Mecury Acids11. Which term is used to define the temperature at which a substance changes its status from solid to liquid? Melting point Condensation point Boiling point Freezing point12. The specific heat capacity of a pure substance Is always changing as the temperature increases Does not depend on the purity of the substance Depends on its structure Is a fixed value13. 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 _______ 4 32 16 6414. In an isochoric process, the internal energy of a system decreases by 50 J. What is the heat exchange? 50 J -50 J Zero None of the above15. 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. 80.548°C 20.157°C 58.147°C 79.166°C16. Solids with weekly bonded electrons are good conductors of heat. False True17. 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 melting of the liquid condensing of the duedorent evaporation of the liquid boiling of the perfume18. An ideal black body is thrown into a furnace. The black body is room temperature. It is observed that _______ Initially, it is the darkest body and at later it cannot be distinguished Initially, it is darkest body and at later times the brightest It cannot be distinguished at all times At all times it is the darkest body19. 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? 36 J -96 J -36 J 96 J20. 540g of ice at 0°C is mixed with 540g of water at 80°C. What is the final temperature of the mixture? 80°C Less than 0° 0°C 40°C21. The amount of energy required to change the liquid to gas and vice versa without any change in temperature is termed as Heat Capacity Latent Heat of Fusion Latent Heat of Vaporization Specific Heat Capacity22. Why locations next to large water bodies tend to have a moderate climate than those further inland? Because of specific heat of water Because of the heating effects of sun Because of the latitude Because of the water in clouds23. The melting point of Iron (Fe) is _________ 660°C 1084°C 1538°C 419°C24. Why is the roof of buildings painted white Because it conducts heat Because it is cheaper Because it reflects radiations Because it absorbs radiation25. A green glass heated in a furnace when taken out in dark glows red. False True26 out of 25Time is Up!