Conceptual Physics Exam 2 Review

Airplane flight best illustrates A) Archimedes' principle. B) Pascal's principle. C) Bernoulli's principle. D) None of the above

C) Bernoulli's principle

When heat is added to boiling water, its temperature A) increases. B) decreases. C) does not change

C) doesn't change

Two equal-sized buckets are filled to the top with water. One of the buckets has a piece of wood floating in it, making its total weight __________. A) more than the weight of the other bucket B) less than the weight of the other bucket C) equal to the weight of the other bucket D) None of the above

C) equal to the weight of the other bucket

The fact that desert sand is very hot in the day and very cold at night is evidence that sand has A) a low specific heat. B) a high specific heat. C) no specific heat

A) a low specific heat

Which of the following is not a compound? A) air B) ammonia C) water D) salt E) All are compounds

A) air

Compared to a glass of ice water with ice in it, a glass of plain ice-cold water without ice on a warm day will warm up A) faster. B) slower. C) in the same amount of time. D) None of the above choices are true

A) faster

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

A) from your finger to the ice

An iron block is placed in a furnace where it is heated and consequently expands. In the expanded condition, its density A) is less. B) is the same. C) is more.

A) is less

Compared to the volume of a kilogram of feathers, the volume of a kilogram of lead is... A) less. B) more. C) the same

A) less

Pumice is a volcanic rock that floats. Its density is A) less than the density of water. B) equal to the density of water. C) more than the density of water.

A) less than the density of water

If the specific heat of water were lower than it is, ponds in the cold of winter would be A) more likely to freeze. B) less likely to freeze. C) neither more nor less likely to freeze

A) more likely to freeze

In a vacuum, an object has no A) buoyant force. B) mass. C) weight. D) temperature. E) all of these

A) no buoyant force

The buoyant force on an object is least when the object is A) partly submerged. B) submerged near the surface. C) submerged near the bottom. D) none of these

A) partly submerged

Strip electrons from an atom and the atom becomes a A) positive ion. B) negative ion. C) different element. D) molecule

A) positive ion

In an electrically neutral atom the number of electrons is equal to the number of A) protons in the nucleus. B) neutrons in the nucleus. C) Choices A and B are both correct. D) Choices A and B are both incorrect.

A) protons in the nucleus

When a gas is changed to a liquid state, the gas A) releases energy. B) absorbs energy. C) neither releases nor absorbs energy. D) both releases and absorbs energy

A) releases energy

Ice tends to form first at the A) surface of bodies of water. B) bottom of bodies of water. C) surface or bottom depending on the water depth.

A) surface of bodies of water

When a load is placed on the middle of a horizontal beam supported at each end, the bottom part of the beam undergoes A) tension. B) compression. C) Insufficient information

A) tension

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

A) thermal equilibrium

The strength of a rope depends on its A) thickness. B) length. C) both of these

A) thickness

A completely submerged object always displaces its own A) volume of fluid. B) weight of fluid. C) density of fluid. D) all of these E) none of these

A) volume of liquid

When water vapor condenses on the inside of a window, the room becomes slightly A) warmer. B) cooler. C) neither warmer nor cooler.

A) warmer

A balloon is buoyed up with a force equal to the A) weight of air it displaces. B) density of surrounding air. C) atmospheric pressure. D) weight of the balloon and contents. E) all of these

A) weight of the air it displaces

Suppose you walk on red-hot coals with bare feet. If bits of the coals do not stick to your feet, it would be best if your feet are A) wet. B) dry. C) warm. D) cold. E) very hot

A) wet

Which could burn the most? A) 100 g of water at 100 degrees C B) 100 g of steam at 100 degrees C C) Both would be equally damaging

B) 100 g of steam at 100 degrees C

Before ice can form on a lake, all the water in the lake must be cooled to A) zero degrees C. B) 4 degrees C. C) minus 32 degrees C. D) None of the above. Ice can form at the surface regardless of the water temperature below

B) 4 degrees C.

A 500N blimp hovers in the air. The buoyant force acting on it is A) zero. B) 500N . C) less than 500N. D) more than 500N. E) None of the above

B) 500 N

Which of the following statements is true? A) An atom is the smallest particle known to exist. B) There are only little over 100 different kinds of atoms that combine to form all substances. C) There are thousands of different kinds of atoms that account for a wide variety of substances. D) A large atom can be photographed with the aid of an ordinary microscope. E) None of these statements are true

B) There are only little over 100 different kinds of atoms that combine to form all substances.

Near the top of a mountain, water in an open pot boils at A) a higher temperature than at sea level. B) a lower temperature than at sea level. C) the same temperature as at sea level. D) None of the above choices are true

B) a lower temperature than at sea level

When a solid is changed to a liquid state, the solid A) releases energy. B) absorbs energy. C) neither releases nor absorbs energy. D) both releases and absorbs energy

B) absorbs energy

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 A) less than 30 degrees C. B) at or about 30 degrees C. C) more than 30 degrees C

B) at or about 30 degrees C

Water pressure is greatest against the A) top of a submerged object. B) bottom of a submerged object. C) sides of a submerged object. D) is the same against all surfaces E) none of these

B) bottom of a submerged object

When an object is partly or wholly immersed in a liquid, it is buoyed up A) by a force equal to its own weight. B) by a force equal to the weight of liquid displaced. C) and floats because of Archimedes principle. D) but nevertheless sinks. E) none of these

B) by a force equal to the weight of liquid displaced

Melting snow A) warms the surrounding air. B) cools the surrounding air. C) neither warms nor cools the surrounding air

B) cools the surrounding air

Consider a sample of ice at 0 degrees C. If the temperature is decreased, the volume of the ice A) increases. B) decreases. C) stays the same

B) decreases

Consider a sample of water at 0 degrees C. If the temperature is slightly increased, the volume of the water A) increases. B) decreases. C) remains the same

B) decreases

If the mass of an object were to double while its volume remains the same, its density would A) halve. B) double. C) stay the same. D) become four times as great

B) double.

When gas in a container is squeezed to half its volume, its density A) halves. B) doubles. C) quadruples. D) remains the same

B) doubles

The chemical properties of matter come mostly from its A) protons. B) electrons. C) neutrons.

B) electrons

When water at 4 degrees C is heated it expands. When water at 4 degrees C is cooled, it A) contracts. B) expands. C) neither contracts nor expands

B) expands

For increased atmospheric pressure, the boiling temperature of a liquid A) goes down. B) goes up. C) remains at 100 degrees C

B) goes up

When a boat sails from fresh water to salt water, the boat will float A) lower in the water. B) higher in the water. C) at the same water level. D) None of the above

B) higher in the water

Which of the following normally warms up fastest when heat is applied? A) water B) iron C) glass D) wood E) All of the above choices are equally true

B) iron

When an iron ring is heated, the hole becomes A) smaller. B) larger. C) neither smaller nor larger. D) either smaller or larger, depending on the ring thickness

B) larger

A lobster crawls onto a bathroom scale submerged at the bottom of the ocean. Compared to its weight above the surface, the lobster will have an apparent weight under water that is A) greater. B) less. C) the same.

B) less.

Which of the following are electrically neutral? A) proton B) neutron C) electron D) ion E) none of these

B) neutron

When liquids change to a solid state, they A) absorb energy. B) release energy. C) neither absorb nor release energy. D) both absorb and release energy

B) release energy

An egg is placed at the bottom of a bowl filled with water. Salt is slowly added to the water until the egg rises and floats. From this experiment, one concludes A) calcium in the egg shell is repelled by sodium chloride. B) the density of salt water exceeds the density of egg. C) buoyant force does not always act upward. D) salt sinks to the bottom

B) the density of salt water exceeds the density of egg.

Evaporation is a cooling process because A) heat is radiated during the process. B) the more energetic molecules are able to escape the liquid C) the temperature of the remaining liquid increases. D) none of these

B) the more energetic molecules are able to escape the liquid

How many different elements are there in a water molecule? A) one B) two C) three D) four E) none of the above

B) two

When a chocolate bar is cut in half, its density is A) halved. B) unchanged. C) doubled. D) None of the above

B) unchanged

A dam is thicker at the bottom than at the top partly because A) water is denser at deeper levels. B) water pressure is greater with increasing depth C) surface tension exists only on the surface of liquids. D) it looks better. E) none of these

B) water pressure is greater with increasing depth

Compared to the mass of a hydrogen atom, the mass of an oxygen atom is A) 8 times as great. B) 12 times as great. C) 16 times as great. D) appreciably more than 16 times as great

C) 16 times as great

Which has the greater density, a lake full of water or a cup full of lake water? A) the cup full of lake water B) the lake full of lake water C) Both have the same density. D) It is impossible to tell without knowing the size of the lake

C) Both have the same density.

Steam burns are more damaging than burns caused by boiling water because steam A) gives up additional energy when it condenses. B) has more energy per kilogram than boiling water. C) Choices A and B are both correct. D) Choices A and B are both incorrect

C) Choices A & B are both correct.

Heat energy is measured in units of A) joules. B) calories. C) Choices A and B are both true. D) Kelvin

C) Choices A & B are both true

Atmospheric molecules do not fly off into outer space because of A) their relatively high speeds. B) their relatively low densities. C) Earth gravitation. D) cohesive forces

C) Earth gravitation

An umbrella tends to move upwards on a windy day principally because A) air gets trapped 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 these

C) air pressure is reduced over the curved top surface

The pressure in a liquid depends on liquid A) density. B) depth. C) both of these D) neither A or B

C) both of these

When you float in fresh water, the buoyant force that acts on you is equal to your weight. When you float higher in the high-density water of the Dead Sea, the buoyant force that acts on you is A) greater than your weight. B) less than your weight. C) equal to your weight.

C) equal to your weight

In an electrically neutral atom, the number of protons in the nucleus is balanced by an equal number of A) neutrons. B) quarks. C) orbital electrons. D) all of these E) none of these

C) orbital electrons

A positive ion has more A) electrons than neutrons. B) electrons than protons. C) protons than electrons. D) protons than neutrons. E) neutrons than protons

C) protons than electrons

When an ice cube in a glass of water melts, the water level A) rises. B) falls. C) remains the same

C) remains the same

A rock suspended by a string weighs 5 N out of water and 3 N when submerged. What is the buoyant force on the rock? A) 8 N B) 5 N C) 3 N D) 2 N E) none of these

D) 2 N

Which of these statements is true? A) A molecule is the smallest particle that exists. B) Chemical elements are made up of about 100 distinct molecules. C) Molecules form atoms that in turn determine chemical properties of a substance. D) Molecules are the smallest subdivision of matter that still retains chemical properties of a substance. E) None of these statements is true

D) Molecules are the smallest subdivision of matter that still retains chemical properties of a substance.

The air in this room has A) mass. B) weight. C) energy. D) all of these E) none of these

D) all of these

If a loaf of bread is compressed, its A) surface tension becomes less. B) molecules become harder. C) density decreases. D) density increases. E) none of these

D) density increases

Food cooked in boiling water at a mountain top cooks slower than when cooked at sea level. If the temperature under the pot of boiling water is increased, the food will cook A) faster at the mountain top. B) faster at sea level. C) faster at both places. D) no differently than it did before the increase

D) no differently than it did before the increase

The reason that buoyant force acts upward on a submerged object is that A) it acts in a direction to oppose gravity. B) if it acted downward, nothing would float. C) the weight of fluid displaced reacts with an upward force. D) upward pressure against the bottom is greater than downward pressure against the top of the submerged object

D) upward pressure against the bottom is greater than downward pressure against the top of the submerged object

Which of these atoms has the most mass? A) hydrogen B) helium C) lead D) uranium E) All have the same mass.

D) uranium

Which of the following is not a mixture? A) salt and water B) cake C) air D) beach sand E) None. All of the above choices are mixtures

E) None. All are mixtures.

Ice is put in a cooler to cool the contents. To speed up the cooling process, the ice can be A) wrapped in newspaper. B) drained of ice water periodically. C) kept out of contact with the food. D) kept in one solid chunk. E) covered with salt.

E) covered with salt

Ice cubes submerged at the bottom of a liquid indicate that the liquid A) produces no buoyant force on the ice. B) has dissolved air. C) is warmer than the ice. D) is not displaced by the submerged ice. E) is less dense than ice.

E) is less dense than the ice.

The reason a life jacket helps you float is A) the jacket makes you weigh less. B) the jacket has the same density as an average human. C) the jacket repels water. D) if you sink, the jacket sinks. E) the density of both you and the jacket together is less than your density alone

E) the density of both you and the jacket together is less than your density alone