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Test #2

How many different elements are in a water molecule?

two

In an electrically neutral atom, the number of protons in the nucleus is balanced by an equal number of

orbital electrons

If an astronaut landed on a planet made of antimatter, there would be an explosion and

the astronaut and an equal amount of the planet would both annihilate

If two protons are removed from an oxygen nucleus, the result is

carbon

When weight is applied to the top of a stone arch, all of the stone blocks in the arch undergo

compression

When a load is placed on the middle of a horizontal beam supported at each end, the bottom part of the beam undergoes

tension

A wooden block has a mass of 1000 kg and a volume of 2 cubic meters. What is the block's density?

500 kg per cubic meter

Which will bounce higher off a hard surface?

a steel ball

If an elephant grew to twice its height, the area of its ears would be about

four times what it was

Flatten a spherical meatball into a hamburger and you increase its

surface area

Water pressure is greatest against the

bottom of a submerged object

What is the buoyant force acting on a 10-ton ship floating in the ocean?

10 tons

Two life preservers have identical volumes, but one is filled with styrofoam while the other is filled with sand. When the two life preservers are fully submerged, the buoyant force is greater on the one filled with

same on each as long as their volumes are the same

Surface tension of liquids

decreases as the liquid temperature increases

The energy source responsible for the motion of molecules that make up the atmosphere is

solar power

A bubble of air released from the bottom of a lake

becomes larger as it rises

As a high-altitude balloon sinks lower and lower into the atmosphere, it undergoes a decrease in

volume

When you touch a cold piece of ice with your finger, energy flows

from your finger to the ice

When an iron ring is heated, the hole becomes

larger

A temperature difference of 10 degrees Celsius is also equal to a temperature difference of 10 on the

Kelvin scale

If you measure a plot of land with a brass tape on a cold day, the actual amount of land you have will be

larger tan measured

Substances absorb heat by the process of

conduction, convection, radiation

Objects that radiate relatively well

absorb radiation relatively well

Newton's law of cooling applies to objects that are

cooling and heating

The molecules in a room-temperature glass of water jostle around at

a great variety of speeds

When liquids change to a solid state, they

release energy

Hot water has a relatively high rate of

evaporation

Entropy is closely related to the

2nd law of thermodynamics

When an ideal gas is subjected to an adiabatic process

none of the above choices are true

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

decreases

A wiggle in time is a

vibration

Which of the following is not a transverse wave?

sound

The frequency of a simple pendulum depends on

two of these

The source of every sound is something that is

vibrating

The approximate range of human hearing is

20 hertz to 20,000 hertz

The explanation for refraction must involve a change in

speed

Sounds waves can interfere with one another so that no sound results.

True

The pitch of a musical sound depends on the sound wave's

frequency

A decibel is a measure of sound's

loudness

Fourier discovered that periodic waves can be represented by

the summation of a series of simple sine waves

Which has the greatest number of protons in its nucleus?

lead

Compared to the atoms that make up the body of an elderly person, the atoms that make up the body of a new born are

the same age

Which potatoes when peeled produce the most peelings?

10 kg of small potatoes

When an object is partly or wholly immersed in a liquid, it is buoyed up

by a force equal to the weight of liquid displaced

To multiply the input force of a hydraulic lift, the input end should be the one having the

smaller diameter piston

In drinking soda or water through a straw, we make use of

atmospheric pressure

Two vertical tubes equal cross-sectional areas are filled with water and mercury. If water is filled to a depth of 10.3m and mercury to a depth of 0.76m, both liquids have equal

weights

The depth which the inverted drinking glass must be pushed beneath the surface of water so that the volume of enclosed air is squeezed to half is

10.3m

A substance that heats up relatively quickly has

low specific heat

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

Consider a closed, sealed can of air placed on a hot stove. The contained air undergoes an increase in

two of these

Energy transfer by convection is primarily restricted to

fluids

The pupil of your eye is

a net absorber of radiant energy

Suppose you want to save energy and you're going to leave your warm house for half an hour on a cold day. You should turn the thermostat

down

A hot dog pants

to help evaporation occur in its mouth and bronchial tract

For increased atmospheric pressure, the boiling temperature of a liquid

goes up

Near the top of a mountain, water in an open pot boils at

a lower temperature than at sea level

To increase the temperature of 50 grams of water by 2 Celsius degrees requires

4.18 Calories

The phenomenon of regelation depends on the

open-structured nature of ice crystals

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

Vibrations of a longitudinal wave move in a direction

at right angles to the direction of wave travel

The amplitude of a particular wave is 1 meter. The top-to-bottom distance of the disturbance is

2 m

You dip your finger repeatedly into water and make waves. If you dip your finger more frequently, the wavelength of the waves

shortens

Double the frequency of sound and you also double its

none if the above

Sound will be louder if a struck tuning fork is held

with its base against the table top

As we grow older, we have the greatest difficulty hearing frequencies that are

high

The fundamental frequency of a violin string is 440 hertz. The frequency of its second harmonic is

880 hertz

Compared to a sound of 30 decibels, a sound of 60 decibels is

1000 times as intense

Which of the following statements is true?

There are only about 100 different kinds of atoms that combine to form all substances

Which of these atoms has the greatest number of electrons?

uranium

If we doubled the magnifying power of the most powerful optical microscope in the world, we would

still not be able to see or photograph an atom

In a closed bottle are a certain number of hydrogen molecules. In an identical closed bottle at the same temperature and internal pressure are a certain number of nitrogen molecules. The bottle with the greatest number of molecules is the one containing

both the same

When a chocolate bar is cut in half, its density is

unchanged

Suppose all sized potatoes are selling at the same price per kilogram. If you peel them for mashing, you will get more potato for your money if you buy

large potatoes

In cold weather, your hands will be warmer if you wear

mittens

The mass of a cubic meter of water is

1000 kg

Ice cubes submerged at the bottom of a liquid indicate that the liquid

is less dense than ice

A scale from which a rock is suspended reads 5 N when the rock is out of water and 3 N when the rock is submerged. The density of the rock is

2.5 times the density of water

A very light-weight horizontal loop of wire is suspended from a spring, lowered into water, and then raised to the surface. Any further attempt to raise it causes the spring to

stretch

What is the approximate mass of a 1-square centimeter column of air that extends from sea level to the top of the atmosphere?

1 kilogram

The faster a fluid moves, the

less its internal pressure

As a woman holding her breath swims deeper and deeper beneath the water's surface, her density

increases

The main difference between gases and plasmas has to do with

electrical conduction

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 heat

Consider a metal ring with a gap cut in it. When the ring is heated, the gap

becomes wider

Room temperature on the Kelvin scale is about

300 K

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

similarity between thermal and electrical conductive properties

It is commonly thought that a can of beverage will cool faster in the coldest part of a refrigerator. Knowledge of Newton's law of cooling

supports this common knowledge

A good absorber of radiation is a

good emitter of radiation

We are warmed by condensation because water molecules in the air that strike our bodies

transfer some of their kinetic energy to us

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

wet

To increase the temperature of 50 grams of water by 2 Celsius degrees requires

100 calories

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 Celsius

The greater the difference in temperature between the input reservoir and the output reservoir for a heat engine, the

greater the efficiency

Consider a cup of tea at room temperature, 24 degrees C. If it is heated until it has twice the internal energy, unlike a piece of metal, its temperature will be

100 degrees C.

The vibrations of a longitudinal wave move in a direction

along the direction of wave travel

To say that one wave is out of phase with another is to say that the waves are

out of step

compressions and refractions normally travel in

the same direction in a wave

The explanation for refraction must involve a change in

speed

On some days, air nearest the ground is colder than air that is higher up. On one of these days, sound waves

tend to be refracted downward

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