Q&A Hero

Q: The main purpose of the condenser in the steam cycle of a steam turbine is to A) cool the steam. B) condense the steam. C) lower pressure on the back side of the turbine blades. D) maintain high efficiency. E) change mechanical energy to electricity.

Q: Every heat engine A) gains heat from a high-temperature reservoir. B) converts energy into mechanical work. C) expels heat to a lower-temperature reservoir. D) all of the above E) none of the above

Q: An example of a heat engine is A) an aircraft turbine. B) an automobile internal combustion motor. C) the steam engine of a railroad train. D) the gasoline motor of a leaf blower. E) all of the above

Q: To totally convert a given amount of mechanical energy into heat is A) possible. B) impossible. C) need more information D) none of the above

Q: A given amount of heat energy can be completely converted to mechanical energy in A) a steam engine. B) an atomic reactor. C) a simple machine. D) all of the above E) none of the above

Q: As a parcel of air at high altitude sinks to a lower elevation with no heat input or output, its temperature A) increases. B) decreases. C) will remain unchanged.

Q: When a parcel of air expands against the environment and no heat enters or leaves, its temperature A) increases. B) decreases. C) remains unchanged.

Q: As a parcel of air is swept upward, with no heat input or output, its temperature A) increases. B) decreases. C) remains the same.

Q: A temperature inversion occurs when the upper layers of air are A) warmer than the lower regions of air. B) cooler than the lower regions of air. C) at the same temperature as lower regions of air.

Q: Chinook winds tend to A) warm an environment. B) cool an environment. C) cool deserts at night. D) warm deserts at sunrise.

Q: In the formation of a cloud, moist air rises and A) expands. B) cools. C) condenses. D) all of the above E) none of the above

Q: The origin of most internal energy in Earth's interior is A) the Sun. B) radioactivity. C) volcanoes. D) none of the above

Q: Earth's atmosphere gets most of its heat from the A) Sun. B) Earth's core. C) both of these D) neither of these

Q: A soda-pop can containing only steam is placed top downward in a pan of water. Whap! The can is dramatically crushed by atmospheric pressure. The reduced pressure inside the can is due to A) contact with the relatively cooler water. B) sudden slowing of the air and steam molecules inside. C) condensation of steam inside. D) reduced internal energy. E) rapid conduction of heat to the relatively cool water.

Q: Adiabatic processes occur in Earth's A) atmosphere. B) oceans. C) mantle. D) all of the above E) none of the above

Q: During an adiabatic compression of an ideal gas A) the internal energy of the gas remains constant. B) the temperature of the gas does not change. C) no heat enters or leaves the gas. D) no work is done on the gas. E) none of the above

Q: When an ideal gas is subjected to an adiabatic process A) no work is done on the gas. B) the temperature of the gas does not change. C) the internal energy of the gas does not change. D) all of the above E) none of the above

Q: When the air of a fully-inflated party balloon quickly escapes, its temperature A) drops. B) rises. C) remains unchanged. D) none of the above

Q: Your hand is warmed when you blow on it with your mouth open, but when your lips are puckered so that air expands as you blow, your hand is A) warmer still. B) cooler. C) neither warmer nor cooler.

Q: An adiabatic process is characterized by the absence of A) entropy. B) pressure change. C) heat exchange. D) temperature change. E) none of the above

Q: The amount of energy ultimately converted to heat by an incandescent light bulb is about A) 10%. B) 40%. C) 80%. D) 100%.

Q: The amount of energy converted to light by an incandescent light bulb is about A) 10% and the amount converted to heat about 90% B) 90% and the amount converted to heat about 10%. C) either of these depending on the brand.

Q: The contained air in a closed, sealed can placed on a hot stove will undergo an increase in A) internal energy. B) temperature. C) pressure. D) all of the above E) none of the above

Q: When a system does work without adding heat, the temperature of the system A) increases. B) decreases. C) remains unchanged. D) none of the above

Q: When mechanical work is done on a system, an increase normally occurs in its A) internal energy. B) temperature. C) both of these D) neither of these

Q: A volume of air that is compressed with no heat entering or leaving becomes A) cooler. B) remain unchanged. C) warmer. D) none of the above

Q: When you compress air with a tire pump, the air temperature in the tire A) increases. B) decreases. C) remains unaffected. D) none of the above

Q: When you vigorously shake a can of chicken broth, you A) are doing work on the broth. B) increase the temperature of the broth. C) both of these D) neither of these

Q: When you rapidly stir raw eggs with an eggbeater, the temperature of the eggs A) increases. B) decreases. C) remain unchanged. D) none of the above

Q: The change in internal energy of adding 100 joules to a system that does 60 joules of work is A) 0 J. B) 40 J. C) 60 J. D) 100 J. E) none of the above

Q: The first law of thermodynamics is a restatement of the conservation of A) momentum. B) energy. C) electric charge. D) all of the above E) none of the above

Q: If a piece of iron and a cup of water at the same temperature are heated so the internal energy of each doubles A) the water will have the higher temperature. B) the iron will have the higher temperature. C) both will have the same temperature. D) need more information

Q: The air pressure in a container of air at 27oC will double when heated to A) 54 degrees C. B) 300 degrees C. C) 327 degrees C. D) 600 degrees C. E) none of the above

Q: If a cup of tea at room temperature, 24oC is heated until it has twice the internal energy, unlike a piece of metal, its temperature will be A) 48oC. B) 100oC. C) 321oC. D) 594oC. E) none of the above

Q: If a 10oC piece of iron is heated until it has twice as much internal energy, its temperature will be A) 20oC. B) 273oC. C) 293oC. D) 566oC. E) none of the above

Q: If a 5oC piece of iron is heated until it has twice as much internal energy, its temperature will be A) 10oC. B) 273oC. C) 278oC. D) 283oC. E) 556oC.

Q: An equal amount of 0oC air that is twice as hot has a temperature of A) 0oC. B) 64oC. C) 100oC. D) 273oC. E) none of the above

Q: When Philadelphia's temperature is 40F and Miami's temperature is 80F, A) Miami is twice as hot as Philadelphia. B) Miami is warmer than Philadelphia. C) both of these D) neither of these

Q: A definite method for losing weight is A) exercise. B) reduce Calorie intake. C) maintain a low body temperature. D) none of the above

Q: Internal energy in thermodynamics is the same as A) temperature. B) thermal energy. C) heat. D) all of the above

Q: Water freezes at atmospheric pressure and a temperature of A) 0 degrees Celsius. B) 32 degrees Fahrenheit. C) about 273 kelvin. D) all of the above E) none of the above

Q: Which of these units of temperature is larger? A) a Celsius degree B) a Kelvin C) both are the same size D) none of the above

Q: The lowest temperature possible in nature is A) 0 degrees C. B) -273 degrees C. C) 4 K. D) none of the above

Q: When ice crystals form in clouds, the surrounding air A) warms. B) cools. C) neither of these

Q: When steam condenses, the surrounding air is A) cooled. B) warmed. C) both of these D) neither of these

Q: During snow fall, the surrounding air is A) cooled. B) warmed. C) both of these D) neither of these

Q: When water freezes, the surrounding air is A) cooled. B) warmed. C) both of these D) neither of these

Q: The most responsible factor for whether a substance takes the phase of solid, liquid, gas, or plasma is its A) composition. B) atomic shell configuration. C) temperature. D) none of the above

Q: As a block of ice at 0oC melts, the block absorbs energy A) and decreases in temperature. B) and increases in temperature. C) without a temperature change. D) all of the above E) none of the above

Q: You can add heat without raising temperature to A) ice. B) boiling water. C) both of these D) neither of these

Q: When moth balls sublime to gas they A) absorb energy. B) release energy. C) both of these D) neither of these

Q: When vapor transforms to a plasma, energy must be A) absorbed by the vapor. B) released from the vapor. C) both of these D) neither of these

Q: When a vapor condenses, energy is A) absorbed by the vapor. B) released from the vapor. C) both of these D) neither of these

Q: When a gas is changed to a liquid, the gas A) releases energy. B) absorbs energy. C) both of these D) neither of these

Q: When liquids change to a solids, they A) absorb energy. B) release energy. C) both of these D) neither of these

Q: When a solid melts, energy is A) absorbed by the solid. B) released by the solid. C) both of these D) neither of these

Q: When a solid is changed to a liquid, the solid A) releases energy. B) absorbs energy. C) both of these D) neither of these

Q: To melt ice, add A) temperature. B) energy. C) force. D) time.

Q: If bits of the coals do not stick to your feet while walking barefoot on red-hot coals, it would be best if your feet are A) wet. B) dry. C) warm. D) cold. E) very hot.

Q: When you walk barefoot on red-hot wooden coals it is best if A) no pieces of metal are among the coals. B) you walk slowly to demonstrate your courage. C) you impress your friends by carrying away bits of wood between your toes. D) all of the above E) none of the above

Q: To illustrate regelation with ice it is important that a A) wire is used. B) string is used. C) either of these D) none of the above

Q: Dean teaches that the phenomenon of regelation is due to the A) freezing point of water. B) melting point of ice. C) open-structured nature of ice crystals. D) high specific heat of water.

Q: Foreign ions introduced to water A) lower the freezing point of water. B) raise the freezing point of water. C) do not affect water's freezing point.

Q: The temperature at which a liquid freezes is A) affected by foreign ions. B) the same temperature at which its solid form melts. C) both of these D) neither of these

Q: The temperature at which water freezes is the same as the temperature at which A) ice melts. B) water boils in a pressure cooker. C) both of these D) neither of these

Q: The addition of salt to water affects its A) crystal composition. B) freezing point. C) viscosity. D) liquidity. E) none of the above

Q: An inventor discovers a harmless and tasteless salt, which when added to water changes its boiling point. The market value for this salt will be better if the salt A) lowers the boiling point of water. B) raises the boiling point of water. C) either raises or lowers the boiling point, as the food would be cooked either way. D) none of the above

Q: Water in a car radiator sometimes boils explosively when the radiator cap is removed, which is due to sudden A) rapid evaporation. B) reduced pressure. C) excess condensation. D) excess vaporization.

Q: In one word, how can water in the power plant of a nuclear submarine far exceed 100oC? A) conductivity B) evaporation C) condensation D) pressure E) vaporization

Q: A good cook knows that the temperature of violently boiling water is A) higher than that of simmering water. B) the same as that of simmering water. C) actually lower than 100oC. D) neither of the above

Q: Water can be turned to ice by A) lowering the surrounding air pressure. B) extracting energy. C) both of these D) neither of these

Q: Hydrothermal vents deep beneath the ocean surface attain temperatures far above 100C due to A) higher salt content. B) reduced salt content. C) greater pressure. D) all of the above E) none of the above

Q: A geyser such as Old Faithful in Yellowstone Park is similar to a A) vacuum bottle. B) canteen. C) coffee percolator. D) teakettle. E) vat of molten lead.

Q: Compared to sea level, water in an open pot in the mountains boils at A) a higher temperature. B) a lower temperature. C) the same temperature. D) none of the above

Q: Increased air pressure on the surface of hot water tends to A) prevent boiling. B) promote boiling. C) both of these D) neither of these

Q: For increased atmospheric pressure, the boiling point of water A) goes down. B) rises. C) remains at 100 degrees C.

Q: When heat is added to boiling water, its temperature A) increases. B) decreases. C) remains unchanged. D) none of the above

Q: Water can be brought to a boil by A) applying heat. B) reducing air pressure on its surface. C) both of these D) neither of these

Q: Compared with sea-level cooking, in cooking eggs by boiling in mountain regions you should boil the eggs A) with a hotter flame. B) for a shorter time. C) for a longer time. D) all of the above E) none of the above

Q: In mountain regions, food cooked in boiling water cooks slower than when cooked at sea level. If the temperature beneath the pot of boiling water is increased, the food will cook A) faster. B) slower still. C) both of these D) neither of these