28/03/2020 Thermal Properties and Processes – Expansivity, Heat Transfer(Senior Class Physics Study by Topics) 28/03/2020 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. 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 above 2. A pure substance would freeze or solidify at its boiling point condensation point melting point sublimation point 3. What is the SI unit of specific heat capacity? J/(kgK) JK/kg J/kg Jkg/K 4. The temperature at which plastics begin to become softer and defer under a load is known as _________ Softening point Eutectic point Heat distortion point Melting point 5. 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 6. On a hilly region, water boils at 95°C. What is the temperature expressed in Fahrenheit? 20.3°F 203°F 150°F 100°F 7. Which term is used to define the temperature at which a substance changes its status from solid to liquid? Freezing point Boiling point Melting point Condensation point 8. 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 At all times it is the darkest body Initially, it is darkest body and at later times the brightest It cannot be distinguished at all times 9. 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 water in clouds Because of the latitude Because of the heating effects of sun 10. 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-1 160 J kg -1 °C-1 80 J kg -1 °C-1 11. The temperature of a body can be negative on the Kelvin scale. False True 12. 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 _______ 64 4 32 16 13. Compared to burn due to air at 100°C, a burn due to steam at 100°C is _______ More dangerous Not dangerous Equally dangerous Less dangerous 14. The internal energy comprises of two types of energies, those are magnetic and electrical energy kinetic and potential energy kinetic and magnetic energy mechanical and electrical energy 15. The heat capacity of a material defined as ___________ C = dT/dQ C = dQ/dT C = 1/m . dE/dT C = m . dE/dT 16. The specific heat capacity of a pure substance Is a fixed value Is always changing as the temperature increases Does not depend on the purity of the substance Depends on its structure 17. 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 dark painting will appear much brighter The whole china dish will be bright The china dish doesn’t glow The china dish will develop patterns 18. 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 Purification Conduction Radiation 19. The response of a material due to the function of heat is known as __________ Thermal property Chemical property Electrical property Mechanical property 20. Temperature is a microscopic concept. True False 21. A green glass heated in a furnace when taken out in dark glows red. False True 22. 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 3.5°C to 4.5°C at 76mm of Hg From 14.5°C to 15.5°C at 760mm of Hg From 13.5°C to 14.5°C at 76mm of Hg From 98.5°C to 99.5°C at 760mm of Hg 23. Specific heat of materials is expressed in terms of __________ m³/kg J/kg K J/K W/m K 24. 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 Elongated cylindrical bulb Spherical bulb 25. 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 evaporation of the liquid melting of the liquid condensing of the duedorent 1 out of 25 Time is Up! Time's up