PHYSICS CH 17

When a geyser erupts, pressure at its bottom a. decreases b. is unaffected c. increases d. all of the above e. none of the above

a. decreases

The addition of salt to water affects its a. freezing point b.crystal composition c. viscosity d. liquidity e. none of the above

a. freezing point

The pressure at the bottom of a geyser is a. greater than nearer the top b. the same as nearer the top c. less than nearer the top d. all of the above e. none of the above

a. greater than nearer the top

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

a. ice melts

When fast-moving water molecules collide they tend to a. rebound without sticking b. stick c. both of these d. neither of these

a. rebound without sticking

Morning dew on the grass is a result of a. slow-moving water molecules sticking to one another b. air pressure on water vapor c. evaporation of water d. the open structured form of water crystals

a. slow-moving water molecules sticking to one another

When slow-moving water molecules collide they tend to a. stick b. rebound without sticking c. both of these d. neither of these

a. stick

Which involves a larger number of calories? a. the condensation of 1 gram of steam at 100 C to water at 100C b. the cooling of 1 gram of water at 100 degrees C to 1 gram of ice at absolute 0 c. both the same d. none of these

a. the condensation of 1 gram of steam at 100 C to water at 100C

Stored potatoes, beets, and rutabagas freeze at temperatures below zero degrees Celsius (rather than at exactly zero) because a. the water in them contains dissolved salts and sugars b. they are good absorbers of radiant energy c. that are relatively dense d.they are good radiators of energy e. all of the above

a. the water in them contains dissolved salts and sugars

Melting snow tends to a.cool the surrounding air b. warm the surrounding air c. neither of these

a.cool the surrounding air

A boy scout will be burned more severely by a. 100g of water at 100C b. 100g of steam at 100 C c. both about equally d. Neither of these

b. 100g of steam at 100 C

Increased air pressure on the surface of hot water tends to a. promote boiling b. prevent boiling c. both of these d. neither of these

b. prevent boiling

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. either raises or lowers the boiling point, as the food would be cooked either way b. raises the boiling water c.lowers the boiling point of water d. none of the above

b. raises the boiling point of water

When liquids change to a solids, they a. absorb energy b. release energy c. both of these d. neither of these

b. release of energy

When a vapor condenses, energy is a. absorbed by the vapor b. released from the vapor c. both of these d. neither of these

b. released from the vapor

When a gas is changed to a liquid, the gas a. absorbs energy b. releases energy c. both of these d. neither of these

b. releases energy

The most responsible factor for whether a substance takes the phase of solid, liquid, gas, or plasma is its a. composition b. temperature c. atomic shell configuration d. none of the above

b. temperature

When steam condenses, the surrounding air is a. cooled b. warmed c. both of these d. neither of these

b. warmed

When water freezes, the surrounding air is a. cooled b. warmed c. both of these d. neither of these

b. warmed

When water vapor condenses on the inside of a window, the room becomes slightly a. cooler b. warmer c. both of these d. neither of these

b. warmer

What is the predominant gas is in a bubble of boiling water? a. H2O b. CO2 c.O2 d. N2

a. H2O

Evaporation is a cooling process and condensation is a. a warming process b. a cooling process also c. neither of these

a. a warming process

When condensation occurs inside your bedroom window, the air outside is appreciably a. colder b. warmer c. both of these d. neither of these

a. colder

a canteen that is wet on the outside results in water inside that is a. cooler b. warmer c. both d. neither

a. cooler

How does the freezing point of a liquid compare with its melting point? a. Freezing point is less than melting point for a pure substance b. freezing point is greater than melting point for a pure substance c. Both freezing point and melting point are the same for a pure substance

c. Both freezing point and melting point are the same for a pure substance

The molecules in a room-temperature glass of water jostle around at a. a very small range of speeds b. much the same rates of speed c. a great variety of speeds

c. a great variety of speeds

Water can be brought to a boil by a. reducing air pressure on its surface b. applying heat c. both of these d. neither of these

c. both of these

Ice is put in a cooler to cool the contents. To speed up the cooling process, the ice can be a.drained of water periodically b. kept away from the food c. broken into smaller pieces d. wrapped in newspaper e. none of the above

c. broken into smaller pieces

The surface of hot water has a relatively high rate of a. conductivity b. condensation c. evaporation d. convection

c. evaporation

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

c. for a longer time

Hydrothermal vents deep beneath the ocean surface attain temperatures far above 100°C due to a. higher salt content b. reduced salt content c. greater pressure d. all of the above e. none of the above

c. greater pressure

Stored potatoes, beets, and rutabagas in an unheated well-insulated room can be protected from freezing by having in the room a. blocks of foam plastic b. an ample supply of fire wood c. large tubs of water d. none of the above

c. large tubs of water

Foreign ions introduced to water a. raise the freezing point of water b. do not affect water's freezing point c. lower the freezing point of water

c. lower the freezing point of water

When heat is added to boiling water, its temperature a. decreases b. increases c. remains unchanged d. none of the above

c. remains unchanged

Compared to sea level, water in an open pot in the mountains boils at a. the same temperature b. a higher temperature c. the lower temperature d. none of the above

c. the lower temperature

A hot dog pants a. to impress dogs of the opposite sex b. to provide more oxygen into its lungs c. to enable the evaporation in its mouth and bronchial tract d. none of the above

c. to enable the evaporation in its mouth and bronchial tract

Firefighters find that the temperature of burning material is best lowered when water is a. salted b. used in small amounts c. pointed away from the flames d. sprayed as a fine mist

d. sprayed as a fine mist

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. very hot b. warm c. cold d. dry e. wet

e. wet