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. The temperature at which plastics begin to become softer and defer under a load is known as _________ Heat distortion point Melting point Softening point Eutectic point 2. Specific heat of materials is expressed in terms of __________ m³/kg J/kg K J/K W/m K 3. 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 40 J kg -1 °C-1 120 J kg -1 °C-1 160 J kg -1 °C-1 4. 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 40°C Less than 0° 80°C 5. The internal energy comprises of two types of energies, those are kinetic and potential energy kinetic and magnetic energy magnetic and electrical energy mechanical and electrical energy 6. In an experiment, 100 g of liquid requires 12600 J of thermal energy to raise it from 30 °C to 60 °C, the thermal capacity of 100 g of water is 300 J K 420 J K-1 420 J K 300 J K-1 7. 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? Radiation Conduction Convection Purification 8. Why locations next to large water bodies tend to have a moderate climate than those further inland? Because of the water in clouds Because of the heating effects of sun Because of the latitude Because of specific heat of water 9. Solids with weekly bonded electrons are good conductors of heat. False True 10. The specific heat capacity of a pure substance Does not depend on the purity of the substance Is always changing as the temperature increases Depends on its structure Is a fixed value 11. 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 evaporation of the liquid condensing of the duedorent melting of the liquid boiling of the perfume 12. Internal energy is Thermal energy that a body possesses The average molecular kinetic energy and average molecular potential energy of a body The sum of molecular kinetic energy and molecular potential energy of a body The sum of kinetic energy and potential energy of a body 13. 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 ___________ The blue piece will look blue and red will look as usual 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 14. 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 13.5°C to 14.5°C at 76mm of Hg 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 15. The melting point of Iron (Fe) is _________ 660°C 1538°C 1084°C 419°C 16. The temperature of a body can be negative on the Kelvin scale. True False 17. A pure substance would freeze or solidify at its melting point condensation point sublimation point boiling point 18. 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 16 64 32 19. What is the SI unit of specific heat capacity? JK/kg J/(kgK) Jkg/K J/kg 20. The thermometer bulb should have ______ Varying heat capacity High heat capacity No heat capacity Small heat capacity 21. Mercury has the boiling point of 357 °C 57 °C 157 °C 257 °C 22. 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? 8000 Å 6000 Å 2000 Å 9000 Å 23. 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. 20°C 0°C 60°C 40°C 24. How is the spalling resistance index defined? αlΔT hS/αE P/A k/cpP 25. When the first law of thermodynamics, Q = ΔU + W, is applied to an ideal gas that is taken through an isothermal process, W = 0 Q = 0 ΔU = 0 None of the above 1 out of 25 Time is Up! Time's up
