PHYS-1415, Test 3 Review

17) As more lamps are put into a parallel circuit, the overall current in the power source A) increases. B) decreases. C) remains the same.

A) increases.

8) The flow of charge in a circuit depends on A) adequate resistance. B) a potential difference. C) adequate chemical action. D) all of the above

B) a potential difference.

12) Heat a copper wire and its electric resistance A) decreases. B) remains unchanged. C) increases.

C) increases.

13) When the voltage across a steady resistance is doubled, the current A) is half. B) remains the same. C) is doubled. D) is quadrupled.

C) is doubled.

14) When a steady voltage is across one-half as much resistance, the current A) is half. B) remains the same. C) is doubled. D) is quadrupled.

C) is doubled.

20) The form of heat transfer that doesn't depend on a medium is A) conduction. B) convection. C) radiation. D) all of the above

C) radiation.

7) Sound travels faster in A) air. B) water. C) steel. D) a vacuum. E) same in each

C) steel.

19) Blow on your hand with your mouth open. Then do the same with your lips puckered and you'll find A) a difference in temperatures. B) the breath from puckered lips is cooler. C) both of these D) neither of these

a difference in temperatures. the breath from puckered lips is cooler. C) both of these

4) A wave travels an average distance of 6 m in 1 s. What is the wave's velocity? A) less than 0.2 m/s B) 1 m/s C) 3 m/s D) 6 m/s E) more than 6 m/s

D) 6 m/s

16) Energy transfer by convection is primarily restricted to A) solids. B) liquids. C) gases. D) fluids. E) none of the above

D) fluids.

4) When the distance between two charges is halved, the electrical force between them A) is reduced by 1/4. B) halves. C) doubles. D) quadruples. E) none of the above

D) quadruples.

11) A standing wave occurs when A) two waves overlap. B) a wave reflects upon itself. C) the speed of the wave is zero or near zero. D) the amplitude of a wave exceeds its wavelength.

B) a wave reflects upon itself.

5) Magnetic domains normally occur in A) iron. B) copper. C) silver. D) all of the above E) none of the above

A) iron.

10) Reverberation is a phenomenon you would likely to hear if you sing in the A) shower. B) desert. C) tundra.

A) shower.

22) When an object absorbs as much as it radiates A) it remains at about the same temperature. B) it is a net absorber. C) it is a net radiator. D) none of the above

A) it remains at about the same temperature.

4) Absolute zero corresponds to a temperature of A) 0 K. B) -273° C. C) both of these D) none of the above

0 K. -273° C. C) both of these

3) The temperature of melting ice is A) 0°C. B) 32°F. C) both of these

0°C. 32°F. C) both of these

2) The temperature of boiling water is A) 100°C. B) 212°F. C) both of these

100°C. 212°F. C) both of these

12) A node is a position of A) minimum amplitude. B) maximum amplitude. C) neither

A) minimum amplitude.

2) If the frequency of a certain wave is 10 Hz, its period is A) 0.1 s. B) 10 s. C) 100 s. D) none of the above

A) 0.1 s.

21) Objects that radiate relatively well A) absorb radiation relatively well. B) reflect radiation relatively well. C) both of these D) neither of these

A) absorb radiation relatively well.

2) An electron and a proton A) attract each other. B) repel each other. C) attract or repel depending on distance.

A) attract each other.

2) Like kinds of magnetic poles repel while unlike kinds of magnetic poles A) attract. B) repel also. C) may attract or repel.

A) attract.

7) The magnetic field lines about a current-carrying wire form A) circles. B) radial lines. C) eddy currents. D) spirals.

A) circles.

12) If water at 0°C slightly increases in temperature, the water A) contracts. B) expands. C) neither of these

A) contracts.

15) Electrical resistance is greater for A) dry skin. B) wet skin. C) both the same

A) dry skin.

11) Faraday's law is the law that describes A) electromagnetic induction. B) the connection between current, voltage, and resistance. C) the attraction and repulsion of magnetic poles. D) the force between magnetic poles. E) all of the above

A) electromagnetic induction.

5) The number of protons in the nucleus of an electrically neutral atom is equal to the number of A) electrons that surround the nucleus. B) neutrons in the nucleus. C) both D) neither

A) electrons that surround the nucleus.

6) A positive ion has a deficiency of A) electrons. B) neutrons. C) negative ions.

A) electrons.

9) The electric current in a copper wire is normally composed of A) electrons. B) protons. C) ions. D) all or any of the above

A) electrons.

14) Power is the rate at which A) energy is transferred. B) voltage can be changed. C) current can be induced.

A) energy is transferred.

2) What moves from place to place in wave motion is A) energy. B) momentum. C) pressure. D) matter.

A) energy.

11) The operation of a bimetallic strip relies on differences in A) expansions of metals. B) conductivities of metals. C) heat capacities of metals.

A) expansions of metals.

6) When you touch a piece of ice with your finger, energy flows A) from your finger to the ice. B) from the ice to your finger. C) both of these D) none of the above

A) from your finger to the ice.

7) Just as water flows from high to low pressure, electric charge flows from A) high to low voltage. B) high charge concentration to low charge concentration. C) high resistance to low resistance. D) all of the above E) None of the above

A) high to low voltage.

18) When a volume of air is compressed, air temperature A) increases. B) decreases. C) neither of these

A) increases.

5) When the temperature of a quantity of 0°-C air at constant pressure is lowered by 1 degree, its volume A) shrinks by 1/273. B) shrinks by 100/273. C) increases by 1/273. D) increases by 100/273.

A) shrinks by 1/273.

5) Which of the following is not a transverse wave? A) sound B) light C) radio D) all of the above E) none of the above

A) sound

6) Which of the following is a longitudinal wave? A) sound B) light C) radio D) all of the above E) none of the above

A) sound

13) Ice tends to form at the A) surface of bodies of water. B) layer of water slightly below the surface. C) bottom of bodies of water.

A) surface of bodies of water.

14) A Doppler effect occurs when a source of sound moves A) toward you. B) at right angles to you. C) both D) neither

A) toward you.

1) The motion of atoms and molecules that most affects temperature is A) translational. B) rotational. C) vibrational. D) none of the above

A) translational.

10) An electric motor and electric generator are A) very similar devices. B) entirely different devices. C) none of the above

A) very similar devices.

1) A wiggle in time is a A) vibration. B) wave. C) both D) neither

A) vibration.

10) The number of electrons delivered daily by power utilities to an average American home in a typical year in this century is A) zero. B) 110. C) 220. D) billions of billions. E) none of the above

A) zero.

11) When you purchase a water pipe in a hardware store, water is not included. When you purchase copper wire, electrons A) must be supplied by you, just as water in a water pipe. B) already exist in the wire. C) may fall out, which is why wires are insulated. D) none of the above

B) already exist in the wire.

8) The reflection of sound is A) reverberation. B) an echo. C) bouncing waves.

B) an echo.

8) The final temperature of 1 liter of 40°C water poured into 1 liter of 20°C water is A) less than 30°C. B) at or about 30°C. C) more than 30°C.

B) at or about 30°C.

15) An electric generator of itself A) can produce enough energy to light cities. B) cannot produce energy, but convert energy of other forms to electric energy. C) neither

B) cannot produce energy, but convert energy of other forms to electric energy.

6) Magnetic field lines about a current-carrying wire A) extend radially from the wire. B) circle the wire in closed loops. C) both D) neither

B) circle the wire in closed loops.

14) In terms of transferring heat, red-hot wooden coals A) conduct quite well. B) conduct poorly. C) radiate poorly. D) convect poorly.

B) conduct poorly.

17) If a volume of air is warmed, it expands and tends to A) warm. B) cool. C) neither of these

B) cool.

16) As more lamps are put into a series circuit, the overall current in the power source A) increases. B) decreases. C) stays the same.

B) decreases.

7) When you touch a hot penny in the sunlight with your finger, energy flows A) from your finger to the penny. B) from the penny to your finger. C) both ways.

B) from the penny to your finger.

1) Unlike electric charges, magnetic poles cannot be A) located. B) isolated. C) destroyed.

B) isolated.

15) The reason you can walk barefoot on red-hot coals of wood without burning your feet mainly involves A) low temperature of the coals. B) low conductivity of the coals. C) mind over matter techniques.

B) low conductivity of the coals.

9) A substance that heats up relatively quickly has a A) high specific heat capacity. B) low specific heat capacity. C) high or low specific heat capacity.

B) low specific heat capacity.

1) A pair of positively-charged plastic straws tend to A) attract each other. B) repel each other. C) neutralize each other.

B) repel each other.

10) Which will cool faster when removed from a furnace? A) iron B) silver C) the same

B) silver

3) The medium in which a wave travels A) moves along with the wave. B) transmits the wave. C) inhibits the wave. D) reflects the wave.

B) transmits the wave.

18) The electric power of a lamp that carries 2 A at 120 V is A) 1/6 W. B) 2 W. C) 60 W. D) 20 W. E) 240 W.

E) 240 W.

3) Surrounding every moving electron is A) a magnetic field. B) an electric field. C) both D) neither

a magnetic field. an electric field. C) both

8) A magnetic force acts most strongly on a current carrying wire when it A) carries a very large current. B) is perpendicular to the magnetic field. C) either or both D) none of the above

carries a very large current. is perpendicular to the magnetic field. C) either or both

9) No magnetic force acts on a current carrying wire when it A) carries a very small current. B) is perpendicular to the magnetic field. C) either or both D) none of the above

carries a very small current. is perpendicular to the magnetic field. either or both D) none of the above

12) Electromagnetic induction is employed in A) credit cards. B) computers. C) iPads. D) all of the above E) none of the above

credit cards. computers. iPads. D) all of the above

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

echoes. the Doppler effect. ultrasound. D) all of the above

11) The natural frequency of an object depends on its A) elasticity. B) size and shape. C) both D) neither

elasticity. size and shape. C) both

13) The main difference between a generator and a motor involves which terminal is A) input. B) output. C) both

input. output. C) both

3) The electrical force between electric charges depends only on their A) magnitude. B) separation distance. C) both of these D) neither of these

magnitude. separation distance. C) both of these

4) Magnetism is due to the motion of electrons as they A) move around the nucleus. B) spin on their axes. C) both D) neither

move around the nucleus. spin on their axes. C) both

13) A Doppler effect occurs when a source of sound moves A) toward you. B) away from you. C) either D) neither

toward you. away from you. C) either

9) Sound energy that is not reflected is A) transmitted. B) absorbed. C) either or both

transmitted. absorbed. C) either or both