Welcome to your Thermal Properties and Processes - Expansivity, Heat Transfer(Senior Class Physics Study by Topics) NAME EMAIL PHONE NUMBER 1. The melting point of Iron (Fe) is _________ 1084°C 1538°C 419°C 660°C 2. A green glass heated in a furnace when taken out in dark glows red. False True 3. Which term is used to define the temperature at which a substance changes its status from solid to liquid? Boiling point Condensation point Melting point Freezing point 4. 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 14.5°C to 15.5°C at 760mm of Hg From 98.5°C to 99.5°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 5. The response of a material due to the function of heat is known as __________ Electrical property Chemical property Thermal property Mechanical property 6. On a hilly region, water boils at 95°C. What is the temperature expressed in Fahrenheit? 150°F 100°F 20.3°F 203°F 7. The specific heat capacity of a pure substance Is a fixed value Does not depend on the purity of the substance Depends on its structure Is always changing as the temperature increases 8. The energy due to which the molecules held at a fixed position vibrate, this energy is termed as physical energy external energy internal energy chemical energy 9. Mercury has the boiling point of 157 °C 257 °C 357 °C 57 °C 10. What is the SI unit of specific heat capacity? J/(kgK) J/kg Jkg/K JK/kg 11. In an isochoric process, the internal energy of a system decreases by 50 J. What is the heat exchange? -50 J None of the above 50 J Zero 12. What effect do thermal variations in volume have on a body? Phase transformation Contraction Cracking Expansion 13. Internal energy is Thermal energy that a body possesses The sum of kinetic energy and potential energy of a body The sum of molecular kinetic energy and molecular potential energy of a body The average molecular kinetic energy and average molecular potential energy of a body 14. The heat capacity of a material defined as ___________ C = 1/m . dE/dT C = dT/dQ C = dQ/dT C = m . dE/dT 15. 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 copper on concave side Data is insufficient It bends with steel on concave side It does not expand 16. The temperature at which plastics begin to become softer and defer under a load is known as _________ Eutectic point Heat distortion point Softening point Melting point 17. 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 _______ 16 4 32 64 18. Specific heat of materials is expressed in terms of __________ m³/kg W/m K J/kg K J/K 19. What happens when you heat china having some dark paintings engraved on it at 1000°C and then examine it in a dark room immediately? The whole china dish will be bright The china dish will develop patterns The dark painting will appear much brighter The china dish doesn’t glow 20. 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 29250 J 32950 J 23400 J 21. What happens when a material is heated? It bursts It melts It contracts It expands 22. 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 40 J kg -1 °C-1 80 J kg -1 °C-1 160 J kg -1 °C-1 23. 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 24. The internal energy comprises of two types of energies, those are kinetic and magnetic energy kinetic and potential energy magnetic and electrical energy mechanical and electrical energy 25. 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? Convection Radiation Transmittance Conduction 1 out of 25 Time is Up! Time's up