PHYSICS FINAL

.Two charges separated by one meter exert 1-N forces on each other. If the charges are pulled 3 meters apart, the force on each charge will bea. 0.11 N.b. 0.33 N.c. 0 N.d. 3 N.e. 9 N

A

46) Sound waves can interfere with one another so that no sound results.A) TrueB) False

A

A 340-hertz sound wave travels at 340 m/s in air with a wavelength ofA) 1 m.B) 10 m.C) 100 m.D) 1000 m.E) none of the above

A

A negatively-charged rod is held near an aluminum can that rests on a dry wood table. If you momentarily touch the opposite side of the can with your finger, the can becomesa. positively charged.b. negatively charged.c. partially discharged.d. completely discharged.e. none of the above

A

A piano tuner knows that a key on the piano is tuned to the frequency of a test tuning fork when the fork and key struck at same time produce beats ofA) 0 Hz.B) 1 Hz.C) 2 Hz.D) 3 Hz.E) 4 Hz.

A

A positive charge and a negative charge held a certain distance apart are released. As they move, the force on each particlea. increases.b. decreases.c. stays the same.

A

A sound wave is a A) longitudinal wave. B) transverse wave. C) all of the above D) none of the above

A

An electrically charged atom is ana. ion.b. isotope.c. both of thesed. neither of these

A

An electron and a protona. attract each other.b. repel each other.c. neither attract nor repel each other.

A

An uncharged pith ball is suspended by a nylon fiber. When a positively-charged rubber rod is brought nearby, the pith balla. moves toward the rod.b. is unaffected.c. moves away from the rod.d. none of the above

A

Compressions and rarefactions are characteristics ofA) longitudinal waves.B) transverse waves.C) both of theseD) need more information

A

Compressions and rarefactions normally travel inA) the same direction in a wave.B) opposite directions in a wave.C) right angles to the wave direction.D) none of the above

A

If electrons are stripped from an atom it becomes aa. positive ion.b. negative ion.c. different element.d. molecule.

A

In an electrically neutral atom the number of protons in the nucleus is equal to the number ofa. electrons that surround the nucleus.b. neutrons in the nucleus.c. both electrons and neutrons.d. none of the above

A

Rub electrons from your hair with a comb and the comb becomesa. negatively charged.b. positively charged.c. discharged.

A

Sound travels faster in air if the air temperature isA) warm.B) cold.C) average.D) any of the above

A

Superconductors most often requirea. low operating temperatures.b. high operating temperatures.c. magnets.

A

The beat frequency produced when a 240-hertz tuning fork and a 246-hertz tuning fork are sounded together isA) 6 hertz.B) 12 hertz.C) 240 hertz.D) 245 hertz.E) none of the above

A

The bell with the highest natural frequency is relativelyA) small.B) large.C) either of these

A

The electrical force between charges is strongest when the charges area. close together.b. far apart.c. either of thesed. need more information

A

The frequencies of sound that carry farther in air areA) low.B) high.C) ultrasonic.D) none of the above

A

The pair of protons in the nucleus of a helium atoma. attract a pair of orbiting electrons.b. repel orbiting electrons.c. both of thesed. neither of these

A

The source of every sound is something that is A) vibrating. B) moving. C) accelerating. D) undergoing simple harmonic motion. E) a net emitter of energy.

A

The wavelengths of sound that carry farther in air are relativelyA) long.B) short.C) ultrasonic.D) none of the above

A

To become a positive ion, an atom must a. lose an electron.b. gain an electron.c. lose a proton.d. gain a proton.

A

Two charged particles held a certain distance apart are released. As they move, the acceleration of each decreases. Therefore, their charges have a. the same sign.b. opposite signs.c. need more information

A

When sound travels faster near the ground than above, bending of sound tends to beA) upward.B) downward.C) to the left.D) to the right.E) none of the above

A

Which of these has the greatest mass?a. protonb. electronc. both of thesed. neither of these

A

A base fiddle is louder than a harp because of itsA) thicker strings.B) sounding board.C) lower pitch.D) all of the aboveE) none of the above

B

A main difference between gravitational and electric forces is that electrical forcesa. attract.b. repel or attract.c. obey the inverse-square law.d. act over shorter distances.e. are weaker.

B

A positively-charged rod is held near an aluminum can that rests on a dry wood table. If you momentarily touch the opposite side of the can with your finger, the can becomesa. positively charged.b. negatively charged.c. partially discharged.d. completely discharged.e. none of the above

B

A wave of frequency of 1000 hertz vibrates atA) less than 1000 cycles per second.B) 1000 cycles per second.C) more than 1000 cycles per second.D) none of the above

B

An uncharged pith ball is suspended by a nylon fiber. When a negatively-charged rubber rod is brought near the pith ball, without touching, the balla. becomes charged by induction.b. becomes polarized.c. is repelled by the rod.d. is unaffected.e. none of the above

B

Assuming that xenon (atomic number 54) and krypton (atomic number 36) have the same temperature and pressure, in which gaseous medium does sound travel faster?A) XenonB) KryptonC) a mixture of both D) the same in both

B

Before a thunder storm, clouds in the sky likely becomea. conducting.b. polarized.c. grounded.d. a field-free region.

B

Conducting materials are composed of atoms witha. strong cohesive forces between them.b. loose outer electrons.c. excess neutrons compared with protons.d. vastly more charge than insulators.

B

If you comb your hair and the comb becomes positively charged, then your hair becomesa. positively charged.b. negatively charged.c. uncharged.

B

In air and in water the same sound travels with differentA) frequencies.B) speeds.C) both of theseD) neither of these

B

In choosing between sound waves and radio waves, which has the greater speed?A) sound waveB) radio waveC) both the sameD) need more information

B

Insulating materials are composed of atoms witha. weak cohesive forces.b. tightly bound outer electrons.c. excess protons.d. vastly more charge than conductors.

B

It is said that electric charge is quantized, which means that the charge on an objecta. may occur in an infinite variety of quantities.b. is a whole-number multiple of the charge of one electron.c. will interact with neighboring electric charges.d. can be neither created nor destroyed.e. is sometimes positive.

B

Knowing that the atomic number of neon is greater than that of helium, at the same temperature and pressure, how does the speed of sound in helium gas compare to the speed of sound in neon gas?A) greater in neon than in heliumB) greater in helium than in neonC) the same in both gasesD) depends on the frequency of the sound generated

B

One reason for the higher pitch of your voice after you've inhaled some helium is that sound travels A) slower in helium than in air.B) faster in helium than in air.C) the same speed in helium but with a longer wavelength.

B

Particle A has twice the charge of nearby particle B. Compared to the force on Particle A, the force on Particle B isa. half as much.b. the same.c. twice as much.d. four times as much.e. none of the above

B

Sound refraction can occur when the speed of sound A) remains constant.B) changes.C) ranges below supersonic.D) none of the above

B

Sound will be louder if a struck tuning fork is heldA) in the air.B) with its base against a tabletop.C) with its prongs in shallow water.D) in your closed fist.

B

The approximate range of human hearing isA) 10 hertz to 10,000 hertz.B) 20 hertz to 20,000 hertz.C) 40 hertz to 40,000 hertz.D) none of the above

B

The unit of electric charge, the coulomb, is the charge on aa. single electron.b. specific large number of electrons.c. neutron.d. specific number of neutrons.e. quark.

B

The vast numbers of electrons in a coin don't fly off the surface due to their repulsion becausea. mutual repulsion is incomplete.b. they are attracted by an equal number of protons.c. they are strongly bonded to their atoms.d. all of the abovee. none of the above

B

To become a negative ion, an atom must a. lose an electron.b. gain an electron.c. lose a proton.d. gain a proton.

B

To say that an object becomes electrically polarized means thata. it is electrically charged.b. its charges have been rearranged.c. its internal electric field is zero.d. it is only partially conducting.e. none of the above

B

Two charged particles held a certain distance apart are released. As they move, the force on each particle increases. Therefore, their charges havea. the same sign.b. opposite signs.c. the same mass.d. the same size.e. need more information

B

Two protons attract each other gravitationally and repel each other electrically. The stronger of these two forces isa. gravitation.b. electrical.c. neither of these; they are equal in strength

B

When sound travels faster higher above the ground than below, bending of sound tends to beA) upward.B) downward.C) to the left.D) to the right.E) none of the above

B

When tuning a radio to a particular station, you match the frequency of the internal electrical circuit with the frequency of the wanted radio station. What principle is being employed?A) forced vibrationsB) resonanceC) beatsD) reverberationE) wave interference

B

A balloon will stick to a wooden wall if the balloon is chargeda. negatively.b. positively.c. either of thesed. neither of these

C

A common naturally-polarized bit of matter isa. an electron.b. a hydrogen atomc. a water molecule.d. all of the abovee. none of the above

C

A dolphin perceives its environment by the sense ofA) sight.B) sound.C) both of theseD) neither of these

C

A fundamental rule of electricity is that a. like kinds of charges repel.b. unlike kinds of charges attract.c. both of thesed. neither of these

C

A high-frequency sound source produces a high A) speed. B) amplitude. C) pitch. D) all of the above E) none of the above

C

A positive ion has morea. electrons than neutrons.b. electrons than protons.c. protons than electrons.d. protons than neutrons.e. neutrons than protons.

C

A semiconductor can bea. a conductor.b. an insulator.c. both of thesed. neither of these

C

A transistor is an example of aa. resistor.b. superconductor.c. semiconductor.d. dry cell.e. transmitter.

C

A tuning fork of frequency 200 hertz can resonate if an incident sound wave has a frequency ofA) 100 hertz.B) 200 hertz.C) both of theseD) neither of these

C

Charge carriers in a metal are electrons rather than protons because electrons area. negative.b. smaller.c. loosely bound.d. none of the above

C

Electrostatics is a branch of electricity that focuses on a. electrical charge.b. electrical force.c. both of these when static.d. none of the above

C

If you rub an inflated balloon against your hair and place the balloon against the wall it will stick to the wall, illustratinga. Coulomb's law.b. conduction and insulation.c. charge polarization.d. voltage.

C

Reflection of sound can occur inA) air.B) water.C) both of theseD) neither of these

C

Refraction of sound can occur inA) air.B) water.C) both of theseD) neither of these

C

Reverberation of sound occurs forA) sound interference.B) forced vibrations.C) re-echoed sound.D) resonance.E) none of the above

C

Sound travel fastest inA) water vapor.B) water.C) ice.D) steam.E) all of the above

C

Sound travels fastest inA) air.B) water.C) steel.D) a vacuum.

C

Superconductors are noted for theira. high electric resistance.b. low electric resistance.c. absence of electric resistance.d. low cost.e. bright colors.

C

The electrical force between electric charges depends only on theira. magnitude.b. separation distance.c. both of thesed. neither of these

C

The explanation for refraction must involve a change inA) frequency.B) wavelength.C) speed.D) all of the aboveE) none of the above

C

The force that binds atoms together to form molecules isa. gravitational.b. nuclear.c. electrical.d. centripetal.e. none of the above

C

The phenomenon of beats is a result of soundA) refraction.B) reflection.C) interference.D) all of the aboveE) none of the above

C

The speed of a sound wave in air depends onA) its frequency.B) its wavelength.C) air temperature.D) all of the aboveE) none of the above

C

The speed of sound depends on A) its frequency.B) its amplitude.C) the medium in which it travels.D) all of the aboveE) none of the above

C

The speed of sound in air is greatest forA) high frequencies.B) low frequencies.C) same for all frequencies.

C

Two charges that are separated by one meter exert 1-N forces on each other. If the magnitude of each charge is doubled, the force on each charge isa. 1 N.b. 2 N.c. 4 N.d. 8 N.e. none of the above

C

Wave interference occurs inA) transverse waves.B) longitudinal waves.C) both of the aboveD) none of the above

C

When sound waves superimpose they can interfereA) constructively.B) destructively.C) either of theseD) neither of these

C

Which does NOT belong to the same family?A) infrasonic wavesB) ultrasonic wavesC) radio wavesD) shock wavesE) longitudinal waves

C

Which of these does NOT have an electrical charge?a. protonb. electronc. neutrond. all of the abovee. none of the above

C

An acoustical engineer in designing a music hall is concerned withA) echoes.B) reflection.C) reverberations.D) all of the aboveE) none of the above

D

Electrons can be transferred from one place to another by the process ofa. friction.b. contact, which means touching.c. induction, which means non-touching.d. all of the abovee. none of the above

D

Human hearing is best inA) infrasonic sound.B) ultrasonic sound.C) both of theseD) neither of these

D

In perceiving its environment, a dolphin makes use ofA) echoes.B) the Doppler effect.C) ultrasound.D) all of the aboveE) none of the above

D

Interference is a property ofA) water waves.B) sound waves.C) light waves.D) all of the aboveE) none of the above

D

It is said that electric charge is conserved, which means that electric chargea. may occur in an infinite variety of quantities.b. is a whole number multiple of the charge of one electron.c. will interact with neighboring electric charges.d. can be neither created nor destroyed.e. is sometimes negative.

D

Reports are that singer Caruso was able to shatter a crystal chandelier with his voice, which illustratesA) an echo.B) sound refraction.C) beats.D) resonance.E) interference.

D

Sound waves cannot travel inA) air.B) water.C) steel.D) a vacuum.

D

The fundamental force underlying all chemical reactions isa. gravitational.b. nuclear.c. centripetal.d. electrical.e. none of the above

D

The natural frequency of an object depends on itsA) size.B) shape.C) elasticity.D) all of the aboveE) none of the above

D

To say that electric charge is conserved means that no case has ever been found where a. the total charge on an object has changed.b. quantity of negative charge on an object exactly balances positive charge.c. the total quantity of charge on an object has increased.d. net charge has been created or destroyed.e. none of the above

D

When the distance between two charges is halved, the electrical force between thema. is reduced by 1/4.b. halves.c. doubles.d. quadruples.e. none of the above

D

A conductor differs from an insulator in that a conductor has morea. electrons than protons.b. protons than electrons.c. energy than an insulator.d. faster moving molecules.e. none of the above

E

An explosion occurs 34 km away. The time it takes for its sound to reach your ears, traveling at 340 m/s, isA) 0.1 s.B) 1 s.C) 10 s.D) 20 s.E) more than 20 s.

E

Two charges that are separated by one meter exert 1-N forces on each other. If the charges are pushed together so the separation is 25 centimeters, the force on each charge will bea. 1 N.b. 2 N.c. 4 N.d. 8 N.e. 16 N

E