# Physics Module 4 quiz

When a bimetallic bar made of copper and iron strips is heated, the bar bends toward the iron strip. The reason for this is

copper expands more than iron

Which of the following contracts most when the temperature is increased? Equal volumes of

ice water

When we enlarge a photograph of an iron ring, the image of the hole becomes

larger

Consider a sample of water at 0 degrees C. If the temperature is slightly increased, the volume of the water

decreases

When an iron ring is heated, the hole becomes

larger

Room temperature on the Kelvin scale is about

300K

Aluminum has a specific heat capacity more than twice that of copper. Place equal masses of aluminum and copper wire in a flame and the one to undergo the fastest increase in temperature will b

copper

Compared to a giant iceberg, a hot cup of coffee has

higher temperature, but less internal energy

Before ice can form on a lake, all the water in the lake must be cooled to

4 degrees C

The fact that a thermometer "takes its own temperature" illustrates

thermal equilibrium.

Heat energy is measured in units of

joules and calories

The moderate temperatures of islands throughout the world has much to do with water's

high specific heat.

Some molecules are able to absorb large amounts of energy in the form of internal vibrations and rotations. Materials composed of such molecules have

high specific heats

Pour a liter of water at 40 degrees C into a liter of water at 20 degrees C and the final temperature of the two becomes

at or about 30 degrees C.

The temperature at the bottom of Lake Tahoe, high in the Sierra Nevada Mountains in California, at this moment is

4 degrees c

Systems that are left alone, tend to move toward a state of

more entropy

A volume of air has a temperature of 0 degrees Celsius. An equal volume of air that is twice as hot has a temperature of

273 degrees C

Entropy measures

messiness

When a system does work and no heat is added to the system, its temperature

decreases

To wholly convert a given amount of heat energy into mechanical energy is

impossible regardless of the technique used

Suppose you put a closed, sealed can of air on a hot stove burner. The contained air will undergo an increase in

temperature and pressure

Suppose the temperature of the input reservoir in a heat engine doesn't change. As the sink temperature is lowered, the efficiency of the engine

increases

A hot dog pants

to help evaporation occur in its mouth and bronchial tract.

When liquids change to a solid state, they

release energy

When heat is added to boiling water, its temperature

does not change

For increased atmospheric pressure, the boiling temperature of a liquid

goes up

Increased air pressure on the surface of hot water tends to

prevent boiling

You can briefly touch a hot clothes iron with a bare wet finger because the wetness

absorbs energy in vaporizing.
provides an insulating layer after it changes state.

When a gas is changed to a liquid state, the gas

releases energy

Evaporation is a cooling process because

the more energetic molecules are able to escape the liquid

To melt 50 grams of 0-degree-Celsius ice requires

none of these

Compared to a glass of icewater with ice in it, a glass of plain ice-cold water without ice on a warm day will warm up

faster

f you want to cook eggs by boiling them while in the mountains, then compared to sea-level cooking, you should

boil the eggs for a longer time.

Food in a pressure cooker is cooked faster because of the

higher temp

When bringing water to a boil in the mountains, the time needed to reach the boiling point is

less than sea level

Wrapping a hot potato in aluminum foil significantly reduces the rate at which it cools by

evaporation

is a better insulator than your tile.

Energy transfer by convection is primarily restricted to

fluids

Substances absorb heat energy by the process of

all of these

Metals are both good heat conductors and good electrical conductors because of the

looseness of outer electrons in metal atoms

An object will normally be a net radiator of energy when its temperature is

higher than its surroundings

Wrapping a hot potato in aluminum foil significantly reduces the rate at which it loses energy by

The higher the temperature of an object,

the shorter the wavelengths it radiates

Both black and white road surfaces absorb sunlight. At the end of a sunny day the warmer road surface will b

the black surface

Both black and white road surfaces radiate energy. At the end of a starry night the warmer road surface will be

the white surface

In a mixture of hydrogen gas, oxygen gas, and nitrogen gas, the molecules with the greatest average speed are those of

hydrogen

One of the main reasons one can walk barefoot on red-hot coals of wood without burning the feet has to do wit

low thermal conductivity of the coals

If a poor absorber of radiation were a good emitter, its temperature would be

less than its surroundings

A good reflector of radiation is