Q&A Hero

Q: The quantity of heat that a substance can transfer relates to its A) mass B) specific heat capacity C) change in its temperature. D) all of the above

Q: A substance with a high thermal inertia has a high A) temperature, in many cases. B) heat conductivity. C) specific heat capacity. D) energy content.

Q: Place a 1-kilogram block of iron at 40oC into 1 kilogram of water at 20oC and the final temperature of the two becomes A) less than 30o C. B) at or about 30o C. C) more than 30o C.

Q: Pour two liters of water at 40oC into one liter of water at 20oC and the final temperature of the two becomes A) less than 30o C. B) at or about 30oC. C) more than 30oC.

Q: Pour a liter of water at 40o C into a liter of water at 20oC and the final temperature of the two becomes A) less than 30o C. B) at or about 30o C. C) more than 30o C.

Q: The white-hot sparks from a 4th-of-July-type sparkler that strike your skin transfer A) little energy to you in spite of their high temperature. B) little energy to you due to their low temperature. C) much energy, but at a low temperature. D) none of the above

Q: White-hot sparks from a 4th-of-July-type sparkler that strike your skin have relatively A) high temperatures. B) few molecules per spark. C) low transfer of energy. D) all of the above E) none of the above

Q: Which unit represents the most energy? A) calorie B) Calorie C) joule D) all the same

Q: When 10 grams of hot water cool by 1oC, the amount of heat given off is A) 41.9 calories. B) 41.9 Calories. C) 41.9 joules. D) more than 41.9 joules. E) none of the above

Q: The amount of heat needed to raise the temperature of 1 gram of water by 1oC is A) 4.19 calories. B) 4.19 Calories. C) 4.19 joules. D) none of the above

Q: Heat energy is measured in units of A) joules. B) calories. C) both of these D) neither of these

Q: Heat energy travels from an object with a high A) internal energy to an object with a lower internal energy. B) temperature to an object with a lower temperature. C) both of the above D) none of the above

Q: Compared to a giant iceberg, a hot cup of coffee has A) more internal energy and higher temperature. B) higher temperature, but less internal energy. C) a greater specific heat and more internal energy. D) none of the above

Q: When you touch a hot potato with your finger, energy flows A) from your finger to the potato. B) from the potato to your finger. C) actually, both ways.

Q: When you touch a cold piece of ice with your finger, energy flows A) from your finger to the ice. B) from the ice to your finger. C) actually, both ways.

Q: Internal energy is greater in a A) cup of boiling-hot tea. B) fire-engine pail of boiling-hot tea. C) both the same

Q: In which is the temperature greater? A) boiling-hot tea in a cup B) boiling-hot tea in a fire-engine pail C) both the same

Q: The fact that a thermometer "takes its own temperature" illustrates A) thermal equilibrium. B) energy conservation. C) the difference between heat and internal energy. D) the fact that molecules are constantly moving.

Q: Room temperature on the Kelvin scale is about A) 100 K. B) 200 K. C) 300 K. D) 400 K. E) more than 400 K.

Q: A temperature difference of 10 Celsius degrees is also equal to a temperature difference of 10 on the A) Fahrenheit scale. B) Kelvin scale. C) both of these D) neither of these

Q: Which temperature scale has the smallest sized degrees? A) Fahrenheit B) Celsius C) Kelvin D) none of the above

Q: Which temperature scales have equal sized degrees? A) Fahrenheit and Celsius B) Fahrenheit and Kelvin C) Celsius and Kelvin D) none of the above

Q: Temperature is most closely related to molecular A) kinetic energy. B) potential energy. C) electrical energy. D) mechanical energy in general.

Q: Translational motion is characterized by A) motion that carries a molecule from one place to another. B) the motion used in measuring temperature. C) both of these D) neither of these

Q: The kind of molecular motion that mostly relates to the temperature of a substance is A) translational motion. B) rotational motion. C) vibrational motion. D) all about equally

Q: The air in your room is composed of molecules that have A) nearly identical speeds. B) a wide variety of speeds. C) no speeds worth mentioning.

Q: When ice floats in water, a small part of it extends above the surface. Interestingly, the volume of ice that extends above the surface is equal to the volume of the A) water the ice displaces. B) vast number of open spaces in all the hexagonal ice crystals. C) both of these D) neither of these

Q: The temperature at the bottom of Lake Tahoe, high in the Sierra Nevada Mountains in California, at this moment is A) below 4oC. B) 4oC. C) above 4oC. D) uncertain.

Q: During a very cold winter, water pipes sometimes burst due to A) the ground contracting when colder. B) water expanding when freezing. C) water contracting when freezing. D) thawing producing pressure on the pipes. E) none of the above

Q: When the temperature of a solid block of ice is lowered, its volume A) increases. B) decreases. C) stays the same.

Q: Before ice can form on a lake, all the water in the lake must be cooled to A) zerooC. B) 4oC. C) -32o C. D) none of the above

Q: Consider some water at 6oC. For a slight increase its temperature the water will A) expand. B) contract. C) remain the same.

Q: When water at 4oC is heated it expands. If it is instead cooled it will A) contracts. B) also expand. C) neither contracts nor expands.

Q: If you wish to expand the volume of a sample of water at 4oC A) raise its temperature a bit. B) lower its temperature a bit. C) either of these D) neither of these

Q: If the temperature of a sample of water at 4oC is slightly lowered, its volume A) increases. B) decreases. C) remains the same.

Q: If the temperature of a sample of water at 4oC is slightly increased, its volume A) increases. B) decreases. C) remains the same.

Q: If the temperature of a sample of water at 0oC is slightly increased, its volume A) increases. B) decreases. C) remains the same.

Q: Most of the mass of material that makes up a plasma is A) electrically neutral. B) always positively charged. C) always negatively charged.

Q: When a gas is heated and becomes a plasma, its electric charge is usually A) balanced. B) negative. C) positive. D) non-existent. E) none of these

Q: Which of the following bodies is comprised mostly of plasma? A) Earth B) Moon C) Sun D) all of the above E) none of the above

Q: Plasmas are a central part of power generation in A) MHD generators. B) turbo generators. C) both of these D) neither of these

Q: Glowing plasma is evident in the light from A) a fluorescent lamp. B) the aurora borealis (northern lights). C) some TV screens. D) all the above E) none of the above

Q: When a common fluorescent lamp is lit, the mercury vapor inside is actually in a A) gaseous phase. B) liquid phase. C) plasma phase. D) solid phase. E) none of the above

Q: Most of the matter in our galaxy is in the A) solid phase. B) liquid phase. C) gaseous phase. D) plasma phase. E) none of the above

Q: Which is an example of matter in a plasma phase? A) dry ice B) a torch flame C) molten lava D) liquid hydrogen E) none of the above

Q: The main difference between gases and plasmas has to do with A) the kinds of elements involved. B) interatomic spacing. C) electrical conduction. D) fluid pressure. E) the proportion of matter to antimatter in the universe.

Q: A plasma differs from a gas in that A) its molecules are farther apart. B) it is hotter than a gas. C) it is electrically conducting. D) its atoms are boosted to higher atomic numbers. E) all of the above

Q: Most of the matter in the universe is in the A) solid phase. B) liquid phase. C) gaseous phase. D) plasma phase. E) none of the above

Q: An umbrella tends to move upwards on a windy day principally because A) trapped air under the umbrella, warms, and rises. B) buoyancy increases with increasing wind speed. C) air pressure is reduced over the curved top surface. D) all of the above

Q: When you blow air between a pair of closely-spaced Ping-Pong balls suspended by strings, the balls will swing A) toward each other. B) away from each other. C) away from the air stream, but not necessarily toward or away from each other.

Q: The Bernoulli effect causes fast-moving vans on the highway to be drawn together when A) air speeds up in passing between them. B) air between them stagnates. C) they experience lift. D) all of the above

Q: The Bernoulli effect causes passing ships to be drawn together when the ships are close and moving in A) the same direction. B) opposite directions. C) either of these

Q: A spinning tossed baseball veers off course in the direction of A) crowded streamlines. B) non-crowded streamlines. C) onward-coming streamlines.

Q: A spinning tossed baseball veers off course in the direction of A) reduced air pressure on the ball. B) increased air pressure on the ball. C) non-crowded streamlines.

Q: The tarp covering on a trailer or truck puffs upward for fast-moving vehicles, which illustrates A) Pascal's principle. B) Archimedes' principle. C) the principle of continuity. D) Bernoulli's principle.

Q: Wind blowing over the top of a hill A) increases atmospheric pressure there. B) decreases atmospheric pressure there. C) does not affect atmospheric pressure there.

Q: When water is turned on in a shower, the shower curtain moves towards the water spray. This partly involves A) capillary action. B) surface tension. C) pressure changes in moving fluids. D) none of the above

Q: According to the principle of continuity, the velocity of a fluid multiplied by the cross section through which it flows at one point will equal the product of A) velocity and cross section at another point. B) velocity and pressure at another point. C) a constraint factor. D) none of the above

Q: The principle of continuity states that for fluid flow to be continuous it must A) speed up in narrow regions of flow. B) slow down in wide regions of flow. C) both of these D) neither of these

Q: Airplane flight best illustrates A) Archimedes' principle. B) Pascal's principle. C) Bernoulli's principle. D) Boyle's law.

Q: As a fluid gains speed, its internal pressure A) increases. B) remains unchanged. C) decreases.

Q: An empty jar is pushed open-side downward into water so that trapped air cannot escape. As it is pushed deeper, the buoyant force on the jar A) increases. B) decreases. C) increases, then decreases. D) decreases, then increases. E) remains the same.

Q: A car with closed windows makes a left hand turn. A helium-filled balloon in the car moves to the A) right. B) left. C) front. D) back. E) none of the above

Q: Release a ball inside a freely falling elevator and it falls directly in front of you instead of "falling to the floor," because you, ball, elevator, and enclosed air are in free fall. If you do the same with a helium-filled balloon, the balloon will A) also remain in front of you. B) press against the ceiling. C) press against the floor. D) slowly rise. E) slowly fall.

Q: A large block of wood and a smaller block of iron on weighing scales both register 1 ton. Taking buoyancy of air into account, which has the greater mass? A) wood B) iron C) both have the same mass. D) need more information

Q: Assuming no change in temperature, as a freely expanding helium-filled balloon rises in the atmosphere, the buoyant force acting on it A) increases. B) decreases. C) remains nearly the same.

Q: If you stand on a weighing scale and suddenly the atmosphere vanishes, taking buoyancy into account, the scale reading A) increases. B) decreases. C) remains the same. D) quickly reduces to zero.

Q: Compared to the buoyant force of the atmosphere on a 1-kilogram iron block, the buoyant force on a nearby 1-kilogram helium-filled balloon is A) considerably less. B) considerably more. C) the same.

Q: Compared with the buoyant force of the atmosphere on a 1-liter helium-filled balloon, the buoyant force of the atmosphere on a nearby 1-liter solid iron block is A) considerably less. B) considerably more. C) the same.

Q: A helium-filled balloon released in the atmosphere will rise until A) the pressure inside the balloon equals atmospheric pressure. B) atmospheric pressure on the bottom and top of the balloon are equal. C) the balloon and surrounding air have equal densities. D) all of the above E) none of the above

Q: An object in a vacuum has no A) buoyant force. B) mass. C) weight. D) temperature. E) all of the above

Q: A common 5-liter metal can will float in air if it is A) evacuated of air. B) filled with a very large amount of helium. C) thrown high enough. D) no way, unless the displaced air weighs more than the can and its contents!

Q: As a balloon rises higher and higher into the atmosphere its A) volume decreases. B) density increases. C) weight increases. D) mass decreases. E) none of the above

Q: As a balloon high in the atmosphere descends, it undergoes a decrease in A) volume. B) density. C) weight. D) mass. E) none of the above

Q: As a high-altitude balloon rises higher into the atmosphere, it undergoes a decrease in A) volume. B) density. C) weight. D) mass. E) none of the above

Q: As a high-altitude balloon sinks lower into the atmosphere, it undergoes a decrease in A) volume. B) density. C) weight. D) mass. E) none of the above

Q: Compared with air pressure on the outside, air pressure inside an inflated stretched balloon is A) less. B) equal. C) greater. D) need more information

Q: A buoyant force acts on A) gas-filled balloons. B) you and your classmates. C) both of these D) neither of these

Q: Inside the same room, buoyant force is greater on A) a helium-filled party balloon. B) an elephant. C) both the same

Q: The buoyant force on a one-ton blimp hovering in air is A) zero. B) one ton. C) less than one ton. D) more than one ton.