Welcome to your Thermal Properties and Processes - Expansivity, Heat Transfer(Senior Class Physics Study by Topics) NAME EMAIL PHONE NUMBER 1. 540g of ice at 0°C is mixed with 540g of water at 80°C. What is the final temperature of the mixture? 0°C Less than 0° 40°C 80°C 2. A pure substance would freeze or solidify at its sublimation point condensation point melting point boiling point 3. 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. 60°C 0°C 40°C 20°C 4. 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 -96 J 36 J 5. 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°C 79.166°C 80.548°C 58.147°C 6. The thermometer bulb should have ______ Varying heat capacity Small heat capacity High heat capacity No heat capacity 7. The energy due to which the molecules held at a fixed position vibrate, this energy is termed as external energy chemical energy physical energy internal energy 8. The heat capacity of a material defined as ___________ C = 1/m . dE/dT C = dT/dQ C = m . dE/dT C = dQ/dT 9. What is the SI unit of specific heat capacity? J/kg Jkg/K JK/kg J/(kgK) 10. 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 64 11. When the first law of thermodynamics, Q = ΔU + W, is applied to an ideal gas that is taken through an isothermal process, ΔU = 0 Q = 0 None of the above W = 0 12. In an isochoric process, the internal energy of a system decreases by 50 J. What is the heat exchange? None of the above Zero 50 J -50 J 13. Mercury has the boiling point of 57 °C 257 °C 157 °C 357 °C 14. On a hilly region, water boils at 95°C. What is the temperature expressed in Fahrenheit? 203°F 100°F 20.3°F 150°F 15. A green glass heated in a furnace when taken out in dark glows red. False True 16. Which term is used to define the temperature at which a substance changes its status from solid to liquid? Boiling point Freezing point Melting point Condensation point 17. How is the spalling resistance index defined? hS/αE k/cpP αlΔT P/A 18. Temperature is a microscopic concept. True False 19. The amount of energy required to change the liquid to gas and vice versa without any change in temperature is termed as Latent Heat of Vaporization Latent Heat of Fusion Specific Heat Capacity Heat Capacity 20. The response of a material due to the function of heat is known as __________ Thermal property Mechanical property Electrical property Chemical property 21. Specific heat of materials is expressed in terms of __________ J/K J/kg K W/m K m³/kg 22. Why is the roof of buildings painted white Because it conducts heat Because it reflects radiations Because it absorbs radiation Because it is cheaper 23. 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 bulb Spherical bulb None of the mentioned All of the mentioned 24. The internal energy comprises of two types of energies, those are mechanical and electrical energy magnetic and electrical energy kinetic and magnetic energy kinetic and potential energy 25. 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 J 29250 J 23400 J 22950 J 1 out of 25 Time is Up! Time's up