Chapter 7

Increasing the temperature of 50 grams of water by 1°C requires none of these 1 calorie. 50 calories.

50 calories.

In the mountains, water boils at a lower temperature than at sea level. a higher temperature than at sea level. the same temperature as at sea level.

a lower temperature than at sea level.

When a solid is changed to a liquid phase, the solid absorbs energy. neither releases nor absorbs energy. releases energy.

absorbs energy.

A substance can absorb heat energy by the process of conduction. convection. radiation. all of these

all of these

A substance can absorb heat energy by the process of convection. radiation. conduction. All of these

all of these

A substance can absorb heat energy by the process of conduction. all of these convection. radiation.

all of these

If you were caught in freezing weather with only a candle for heat, you would be warmer in a tent. a wooden house. an igloo. a car.

an igloo.

Cold water will warm to room temperature faster in a depends more on the size of the pots than their color. silver pot. black pot.

black pot.

Hot water will cool to room temperature faster in a black pot. depends more on the size of the pots than their color silver pot.

black pot.

If an object radiates more energy than it absorbs, its thermal energy decreases. both of these temperature decreases. neither of these

both of these

Steam burns are more damaging than burns caused by boiling water because steam has more energy per kilogram than boiling water. both of these gives up additional energy when it condenses. neither of these

both of these

Warm air rises because faster moving molecules tend to move to regions of less pressure. both of these density.

both of these

We feel uncomfortably warm on a muggy day because water molecules are condensing on our bodies. evaporating from our moist bodies. preventing the evaporation from our moist bodies.

condensing on our bodies.

If air were a better conductor than it is, at nighttime the Earth would be not appreciably different in temperature. considerably warmer. considerably colder.

considerably colder.

If a volume of air is warmed, it expands. If a volume of air expands, it cools. neither warms nor cools. warms.

cools.

If a volume of air is warmed, it expands. If a volume of air expands, it cools. warms. neither warms nor cools.

cools.

A good absorber of radiation is a good emitter of radiation. poor emitter of radiation. good reflector. none of these

good emitter of radiation.

The reason the Sun's radiant energy is of shorter wavelengths than the Earth's is because the Sun none of these has a higher temperature than the Earth. all of these has much more thermal energy. is an energy source while the Earth is primarily an energy receiver.

has a higher temperature than the Earth.

Food in a pressure cooker is cooked faster because of the none of these greater rate of bubble formation in the water. higher temperature. increased thermal energy in the water. all of these

higher temperature.

When a volume of air is compressed, its temperature increases. neither increases nor decreases. decreases.

increases.

Your feet feel warmer on a rug than on a tile floor because the rug is usually warmer than tile. none of these is a better insulator than tile. all of these for the same mass has more thermal energy than tile.

is a better insulator than tile.

Your feet feel warmer on a rug than on a tile floor because the rug none of these all of these is a better insulator than tile. is usually warmer than tile. for the same mass has more thermal energy than tile.

is a better insulator than tile.

Hydrogen and oxygen molecules in a sample gas have the same temperature. This means the hydrogen molecules, on average, have the same kinetic energy, but more speed. speed and the same kinetic energy. speed, but more kinetic energy. kinetic energy, but less speed. speed, but less kinetic energy.

kinetic energy, but more speed.

When bringing water to a boil in the mountains, the time needed to reach the boiling point is less than at sea level. the same as at sea level. more than at sea level.

less than at sea level.

When bringing water to a boil in the mountains, the time needed to reach the boiling point is the same as at sea level. more than at sea level. less than at sea level.

less than at sea level.

Food cooked in boiling water in the mountains cooks slower than when cooked at sea level. If the temperature under the pot is increased, the food will cook neither of these slower. faster.

neither of these

To melt 50 g of 0°C ice requires 50 calories. 80 calories. none of these 25 calories.

none of these

Suppose you want to save energy and you're going to leave your warm house for a half hour on a cold day. You should turn the thermostat up a little. to room temperature. down a little. off.

off.

Increased air pressure on the surface of hot water tends to prevent boiling. promote boiling. neither

prevent boiling.

The silver coating on the glass surfaces of a Thermos bottle reduces energy that is transferred by convection. conduction. radiation. friction. none of these

radiation.

A refrigerator produces cold. changes heat into cold. none of these removes thermal energy from inside the refrigerator. causes thermal energy to disappear.

removes thermal energy from inside the refrigerator.

The higher the temperature of an object, the longer the wavelengths it radiates. shorter the wavelengths it radiates.

shorter the wavelengths it radiates.

When heat is added to boiling water, water temperature increases. decreases. stays the same.

stays the same.

Evaporation is a cooling process because the temperature of the remaining liquid decreases. of conduction and convection. heat is radiated during the process. none of these the more energetic molecules are able to escape the liquid.

the more energetic molecules are able to escape the liquid.

A water-filled paper cup held in a flame will not catch fire. This is because paper is a poor conductor of heat. the paper cup cannot become appreciably hotter than the water it contains. water is an excellent conductor of heat. the inside of the paper is wet.

the paper cup cannot become appreciably hotter than the water it contains.

We are warmed by condensation because water molecules in the air that strike our bodies form an insulating layer on our bodies. gain kinetic energy as they change state. transfer some of their kinetic energies to us.

transfer some of their kinetic energies to us.

We are warmed by condensation because water molecules in the air that strike our bodies form an insulating layer on our bodies. transfer some of their kinetic energies to us. gain kinetic energy as they change state.

transfer some of their kinetic energies to us.

At the same temperature, which move with the greater speed in the air? very light molecules heavier molecules All will have equal average speeds.

very light molecules

Evaporation is a cooling process and condensation is a warming process. neither a warming nor cooling process cooling process also.

warming process.

Evaporation is a cooling process and condensation is a neither a warming nor cooling process cooling process also. warming process.

warming process.