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Unformatted text preview: Exam Quiz 2b, Phys 2C Name___________________________________ MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1) Which of the following is a WRONG statement? A) Thermal conductivity of fiberglass is higher than that of air, but lower than that of glass. B) For a good heat radiator it is advantageous to have a high value of emissivity of the surface. C) Filling a cavity in a house wall with fiberglass is likely to provide better thermal insulation as compared to leaving it void, because fiberglass disrupts convective flow of air. D) The insulating value of a double- glazed window may decrease when the spacing is increased, because of the convection of air in the space between the two panes of glass. E) If the specific heat of water were lower than it is, ponds in the cold of winter would be less likely to freeze. 1) 2) Which of the following is a WRONG statement A) A thermometer put in direct sunlight is likely to show temperature higher than the temperature of air around the thermometer, and it is because this thermometer is in thermal contact not only with the air, but also with the sun. B) The operation of a constant- volume gas thermometer is based on the fact that, according to the ideal gas law, the pressue at constant volume is proportional to the absolute temperature of the gas. C) In a composite slab made of two layers of different materials, the heat flow rate throught the slab is the same as the heat flow rates through individual layers and the thermal resistance of the slab is the sum of the thermal resistances of the layers. D) For taking rapid temperature measurements (short equilibration time), a thermometer should preferably have a high thermal conductivity, small size, and large specific heat. E) The moderate temperatures of islands throughout the world has much to do with water's high specific heat. 2) 3) Which of the following is a WRONG statement? A) In a thermos bottle the glass walls are coated with a reflective material to reduce the heat transfer by radiation. B) Heat flow rate is measured in Watts. C) Heat is transferred between objects by the processes of conduction, convection, and radiation. D) A water- filled paper cup held on a burner will not catch fire, and this is because paper is a poor conductor of heat. E) If air were a better conductor than it is, at nighttime the Earth would be considerably colder. 3) 4) A house is insulated so its total heat loss is 370 W per 1 °C difference in temperature between indoors and outdoors. The house is equipped with a heater, which has a maximal power of 10 kW. When the temperature outdoors is - 13 °C, what is the maximal possible temperature inside the house?...
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This note was uploaded on 12/13/2011 for the course PHYS 2C PHYS 2C taught by Professor Groisman during the Spring '11 term at UCSD.
- Spring '11