Physics FINAL EXAM
Call Kai
Learn
Practice Test
Spaced Repetition
Match
Flashcards
Knowt Play1/134
There's no tags or description
Looks like no tags are added yet.
Name | Mastery | Learn | Test | Matching | Spaced | Call with Kai |
|---|
No analytics yet
Send a link to your students to track their progress
135 Terms
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 is
A) 1 N.
B) 2 N.
C) 4 N.
D) 8 N.
E) [none of these]
4 N.
Two charged particles attract each other with a force. If the charges of both particles are doubled, and the distance between them is also doubled, then the force of attraction will be
A) F.
B) 2F.
C) F/2.
D) F/4.
E) [none of these]
F.
Although the energy per coulomb of a high-voltage party balloon is high, the energy transfer that occurs if you touch it is low due to
A) the relatively small amount of charge.
B) rubber being a poor conductor.
C) the small electric potential.
D) [all of these]
the relatively small amount of charge.
Assume that 10 J of work is required to push a charge (initially at rest) into an electric field. If the charge is then released, it flies back to its starting position with a kinetic energy of
A) zero.
B) 5 J.
C) 10 J.
D) more than 10 J.
E) [need more information]
10 J.
A coulomb of charge flowing in a bulb filament powered by a 6-volt battery is provided with
A) 6 ohms.
B) 6 amperes.
C) 6 joules.
D) 6 watts.
E) 6 newtons.
6 joules.
Two light bulbs are connected to a battery, one at a time. The bulb that draws more current has the
A) lower resistance, and is brightest.
B) lower resistance, but is dimmer.
C) higher resistance, and is brightest.
D) higher resistance, but is dimmer.
E) [none of these]
lower resistance, and is brightest.
When two lamps are connected in series to a battery, the electrical resistance that the battery senses is
A) more than the resistance of either lamp.
B) less than the resistance of either lamp.
C) [none of these]
more than the resistance of either lamp.
Compared to a single lamp connected to a battery, two identical lamps connected in series to the same battery will carry
A) more current.
B) less current.
C) the same current.
less current.
An electron beam directed through a magnetic field
A) may be deflected.
B) experiences a force.
C) [both of these]
D) [neither of these]
[both of these]
Although a magnet can change the direction of travel of an electron beam, it cannot change its
A) speed.
B) kinetic energy.
C) [both of these]
D) [neither of these]
[both of these]
If you thrust a magnet into a closed loop of wire, the loop will
A) rotate.
B) have a current in it.
C) [both of these]
D) [neither of these]
have a current in it.
When a magnet is moved to-and-fro in a wire coil, voltage is induced. If the coil has twice as many loops, the voltage induced is
A) half.
B) the same.
C) twice.
D) four times as much.
E) [none of these]
twice.
Which travels with the greatest speed in a vacuum?
A) Radio waves
B) Light waves
C) X-rays
D) Gamma rays
E) [all have the same speed]
[all have the same speed]
What is the frequency of an electromagnetic wave that has a wavelength of 300,000 km?
A) Less than 1 Hz
B) 1 Hz
C) More than 1 Hz
1 Hz
Refraction results from differences in light’s
A) frequency.
B) incident angles.
C) speed.
D) [all of these]
E) [none of these]
speed.
In which material does light travel fastest?
A) Glass
B) Water
C) Plastic
D) Air
E) [same for all]
Air
The human eye has a cornea that takes an initial image of an object. How many times is this image refined at the lens for final placement at the retina?
A) 1
B) 2
C) 3
D) 4
2
A real image produced by the cornea is passed to the front of the lens in the form of a
A) real object.
B) virtual object.
C) virtual image.
virtual object.
When waves from a pair of closely-spaced slits arrive in phase
A) a bright fringe is produced.
B) a dark fringe is produced.
C) both bright and dark fringes are produced.
D) [none of these]
a bright fringe is produced.
Successive bright fringes in an interference pattern result from
A) equal-length distances from the slits.
B) distance from the slits successively increasing one wavelength at a time.
C) destructive interference.
D) [none of these]
distance from the slits successively increasing one wavelength at a time.
Monochromatic light is light of a single
A) wavelength.
B) frequency.
C) color.
D) [all of these]
E) [none of these]
[all of these]
According to the special theory of relativity, while traveling at very high speed your pulse rate
A) increases.
B) decreases.
C) remains unchanged.
remains unchanged.
To outside observers at rest, the overall sizes of objects traveling at relativistic speeds are
A) larger.
B) smaller.
C) the same size.
smaller.
An astronaut traveling forward at 0.87c holds a meterstick in spear-like fashion. This astronaut sees the spear’s length as
A) 0.5 m.
B) 0.87 m.
C) 1 m.
D) 1.25 m.
E) 1.5 m.
1 m.
The finding that electrons in an atom occupy a volume much greater than the volume of the nucleus is best explained by
A) electromagnetic forces.
B) angular momentum conservation.
C) relative sizes of electrons and nuclei.
D) the wave nature of the electron.
E) [none of these]
the wave nature of the electron.
A beam of electrons has
A) wave properties.
B) particle properties.
C) [both of these]
D) [neither of these]
[both of these]
Discrete radii and energy states of atoms were first explained by electrons circling the atom in an integral number of
A) wave frequencies.
B) de Broglie wavelengths.
C) diffraction patterns.
D) high-speed particles.
E) [none of these]
de Broglie wavelengths.
Rays with the shortest wavelengths have the
A) highest frequencies and energies.
B) lowest frequencies and energies.
C) lowest frequencies but highest energies.
highest frequencies and energies.
A certain radioactive isotope placed near a Geiger counter (a type of radiation detector) registers 120 counts per minute. If the half-life of the isotope is one day, what will be the count rate at the end of four days?
A) 30 counts/min
B) 15 counts/min
C) 10 counts/min
D) 7.5 counts/min
E) 5 counts/min
7.5 counts/min
Which experiences the greatest electrical force in an electric field?
A) Alpha particle
B) Beta particle
C) Electron
D) Gamma ray
E) [all the same]
Alpha particle
The electrical force between charges is strongest when the charges are
A) close together.
B) far apart.
C) [either of these]
D) [need more information]
close together.
The electrical force between electric charges depends only on their
A) magnitude (amount of charge).
B) separation distance.
C) [both of these]
D) [neither of these]
[both of these]
The electrical force on a 2-C charge is 60 N. The electric field where the charge is located is
A) 20 N/C.
B) 30 N/C.
C) 60 N/C.
D) 120 N/C.
E) 240 N/C.
30 N/C.
The direction of the electric field is the same as the direction of the electric (Coulomb) force exerted on
A) a neutral test charge.
B) an electron.
C) an atom.
D) a proton.
E) a molecule.
a proton.
Between a pair of equal and opposite charges, field lines are
A) directed from positive to negative.
B) more concentrated closer to the charges.
C) vectors, with patterns that stem from the inverse-square law.
D) [all of these]
E) [none of these]
[all of these]
Electric potential, measured in volts, is the ratio of electrical potential energy to the amount of electric
A) current.
B) resistance.
C) charge.
D) voltage.
E) [none of these]
charge.
If 10 J of work is done in pushing a 1-C charge into an electric field, its electric potential relative to its starting position is
A) less than 10 V.
B) 10 V.
C) more than 10 V.
D) [none of these]
10 V.
Suppose 10 J of work is done in pushing a 1-C charge into an electric field. When released, the test charge’s potential energy will be converted to
A) work.
B) potential energy.
C) kinetic energy.
D) gravitational energy.
kinetic energy.
The net charge on a parallel-plate capacitor depends on
A) the area of the capacitor plates.
B) the distance between the capacitor plates.
C) the medium between the capacitor plates.
D) [all of these]
E) [none of these]
[all of these]
If you stretch a copper wire so that it is thinner, the resistance between its ends
A) decreases.
B) remains unchanged.
C) increases.
increases.
The current in the filament of an old-school incandescent bulb tends to decrease when left on for a while, which indicates
A) something is faulty.
B) a time delay for current attaining its average speed.
C) increased temperature means increased resistance.
D) nothing of interest.
increased temperature means increased resistance.
Ohm’s law tells us that the amount of current produced in a circuit is
A) directly proportional to voltage.
B) inversely proportional to resistance.
C) [both of these]
D) [neither of these]
[both of these]
Just as gravity is the study of a wide range of gravitational interactions, electricity is the study of a wide range of
A) electrical charges.
B) electrical forces.
C) electrical interactions.
D) [none of these]
electrical interactions.
Electrostatics is a branch of electricity that focuses on
A) electrical charge.
B) electrical force.
C) both of these when static.
D) [none of these]
both of these when static.
In an electrically neutral atom the number of protons in the nucleus is equal to the number of
A) electrons that surround the nucleus.
B) neutrons in the nucleus.
C) both electrons and neutrons.
D) [none of these]
electrons that surround the nucleus.
The pair of protons in the nucleus of a helium atom
A) attract a pair of orbiting electrons.
B) repel orbiting electrons.
C) [both of these]
D) [neither of these]
attract a pair of orbiting electrons.
Two protons attract each other gravitationally and repel each other electrically. The stronger of these two forces is
A) gravitation.
B) electrical.
C) [neither of these]
electrical.
The unit of electric charge, the coulomb, is the charge on a
A) single electron.
B) specific large number of electrons.
C) neutron.
D) specific number of neutrons.
E) quark.
specific large number of electrons.
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 these]
quadruples.
The electrical force between electric charges depends only on their
A) magnitude (strength of charge).
B) separation distance.
C) [both of these]
D) [neither of these]
[both of these]
The electrical force on a 2-C charge is 60 N. The electric field where the charge is located is
A) 20 N/C.
B) 30 N/C.
C) 60 N/C.
D) 120 N/C.
E) 240 N/C.
30 N/C.
The electric field between oppositely-charged parallel plates is
A) uniform.
B) stronger at the ends.
C) composed of field lines in opposite directions.
D) [none of these]
uniform.
Electric potential, measured in volts, is the ratio of electrical potential energy to the amount of electric
A) current.
B) resistance.
C) charge.
D) voltage.
E) [none of these]
charge.
If 10 J of work is used in pushing a 1-C charge into an electric field, its electric potential relative to its starting position is
A) less than 10 V.
B) 10 V.
C) more than 10 V.
D) [none of these]
10 V.
To think of electric potential difference we are thinking about
A) current.
B) voltage.
C) resistance.
voltage.
An ampere is a unit of electric
A) current.
B) voltage.
C) resistance.
current.
Electrons flow in a wire when there is
A) an imbalance of charges in the wire.
B) a potential difference across its ends.
C) a difference in potential energy across its ends.
D) [none of these]
a potential difference across its ends.
A coulomb of charge flowing in a bulb filament powered by a 6-volt battery is provided with
A) 6 ohms.
B) 6 amperes.
C) 6 joules.
D) 6 watts.
E) 6 newtons.
6 joules.
The unit of electrical resistance is the
A) volt.
B) ampere.
C) ohm.
D) [none of these]
ohm.
The current produced by voltage in a circuit is impeded by
A) electric barriers.
B) closed switches.
C) electric resistance.
D) [none of these]
electric resistance.
Ohm’s law tells us that the amount of current produced in a circuit is
A) directly proportional to voltage.
B) inversely proportional to resistance.
C) [both of these]
D) [neither of these]
[both of these]
Current in a conductor can be increased by
A) increasing the voltage across it.
B) reducing its resistance.
C) [both of these]
D) [neither of these]
[both of these]
When two lamps are connected in series to a battery, the electrical resistance that the battery “senses” is:
A) more than the resistance of either lamp.
B) less than the resistance of either lamp.
C) [none of these]
more than the resistance of either lamp.
When two lamps are connected in parallel to a battery, the electrical resistance that the battery “senses” is
A) more than the resistance of either lamp.
B) less than the resistance of either lamp.
C) [none of these]
less than the resistance of either lamp.
On some early cars, both headlights failed when one bulb burned out. The headlights were likely connected in
A) parallel.
B) perpendicular.
C) series.
D) haste.
series.
Magnet A has twice the magnetic field strength of Magnet B and at a certain distance pulls on magnet B with a force of 100 N. The amount of force that magnet A exerts on magnet B is
A) at or about 50 N.
B) exactly 100 N.
C) [need more information]
exactly 100 N.
Compared to the huge force that attracts an iron tack to a strong magnet, the force that the tack exerts on the magnet is
A) relatively small.
B) equally huge.
C) inversely proportional to their masses.
equally huge.
Like kinds of magnetic poles repel while unlike kinds of magnetic poles
A) attract.
B) repel also.
C) may attract or repel.
attract.
Whereas electric charges can be isolated, magnetic poles
A) can also.
B) cannot.
C) gather in clusters.
D) [none of these]
cannot.
Surrounding every stationary electron is
A) a magnetic field.
B) an electric field.
C) [both of these]
D) [neither of these]
an electric field.
Surrounding every moving electron is
A) a magnetic field.
B) an electric field.
C) [both of these]
D) [neither of these]
[both of these]
The shape of a magnetic field surrounding a current- carrying conductor is
A) consistent with the inverse-square law.
B) radial.
C) circular.
D) [all of these]
E) [neither of these]
circular.
The direction of the force exerted on a moving charge in a magnetic field is
A) in the direction of the motion.
B) opposite its motion.
C) at right angles to the direction of the motion.
at right angles to the direction of the motion.
If you drop a bar magnet in a vertical copper pipe it will fall slowly because
A) of air resistance.
B) it induces a magnetic field in the pipe that resists motion of the magnet.
C) the copper is a good conductor of both electricity and magnetism.
D) of electron repulsion.
it induces a magnetic field in the pipe that resists motion of the magnet.
Disconnect a small-voltage battery from a coil of many loops of wire and a large voltage may be produced by
A) the sudden collapse in the magnetic field.
B) latent energy in the battery.
C) the resistance of the battery to a change in polarity.
D) electrons already in the wire.
E) the electric field between the battery terminals.
the sudden collapse in the magnetic field.
The voltage involved in self-induction is
A) always in a direction opposing the changing voltage that produced it.
B) likely higher than the changing voltage that caused it.
C) [both of these]
D) [neither of these]
[both of these]
Underlying the concept of self-induction is
A) Ohm’s law.
B) Faraday’s law.
C) Maxwell’s law.
D) [all of these]
Faraday’s law.
When two light bulbs are connected in series to a battery, the electrical resistance that the battery “senses” is
A) more than the resistance of either bulb.
B) less than the resistance of either bulb.
C) [none of these]
more than the resistance of either bulb.
When two light bulbs are connected in parallel to a battery, the electrical resistance that the battery “senses” is
A) more than the resistance of either bulb.
B) less than the resistance of either bulb.
C) [none of these]
less than the resistance of either bulb.
The direction of the force exerted on a moving charge in a magnetic field is
A) in the direction of the motion.
B) opposite its motion.
C) at right angles to the direction of the motion.
at right angles to the direction of the motion.
The force on an electron moving in a magnetic field will be least when its direction is
A) the same as the magnetic field direction.
B) perpendicular to the magnetic field direction.
C) [either of these]
D) [neither of these]
the same as the magnetic field direction.
A beam of singly-charged ions entering a magnetic field are swept into circular paths. The wider paths are those of
A) the lighter ions.
B) the heavier ions.
the heavier ions.
When current reverses direction in a wire, the surrounding magnetic field
A) also reverses direction.
B) becomes momentarily stronger.
C) contracts.
D) expands.
also reverses direction.
The amount of current produced by electromagnetic induction depends on the
A) amount of induced voltage.
B) resistance of the circuit to which it is connected.
C) [both of these]
D) [neither of these]
[both of these]
When a magnet is moved to and fro in a wire coil, voltage is induced. If the coil has twice as many loops, the voltage induced is
A) half.
B) the same.
C) twice.
D) four times as much.
E) [none of these]
twice.
When a change occurs in the magnetic field in a closed loop of wire
A) a voltage is induced in the wire.
B) a current is created in the loop of wire.
C) electromagnetic induction occurs.
D) [all of these]
E) [none of these]
[all of these]
Electromagnetic induction occurs in a coil when there is a change in
A) electric field intensity in the coil.
B) magnetic field intensity in the coil.
C) electromagnetic polarity.
D) [none of these]
magnetic field intensity in the coil.
The electric field between a pair of oppositely charged parallel plates
(a) gets weaker with distance inside the plates.
(b) follows the inverse-square law.
(c) Both of these.
(d) Neither of these.
Neither of these.
As more lamps are connected in parallel in a circuit, the current in the power source
(a) increases.
(b) decreases.
(c) remains the same.
(d) Not enough information to say
increases.
In a circuit of two lamps in parallel, if the current in one lamp is 2 A, the current in the other lamp is
(a) about 1 A.
(b) 2 A.
(c) Depends on which lamp is closer to the battery
(d) Not enough information to say
Not enough information to say
The metal detectors people walk through at airports operate via
(a) Ohm’s law.
(b) Faraday’s law.
(c) Coulomb’s law.
(d) Newton’s laws
Faraday’s law.
Electricity and magnetism connect to form
(a) mass.
(b) energy.
(c) ultrahigh-frequency sound.
(d) light.
light.
Compared with the power input, the power output of an ideal transformer is
(a) greater.
(b) less.
(c) the same.
(d) Any of these.
the same.
A step-up transformer in an electric circuit can step up
(a) voltage.
(b) energy.
(c) Both of these.
(d) Neither of these
voltage.
A voltage will be induced in a wire loop when the magnetic field within that loop
(a) changes.
(b) aligns with the electric field.
(c) is at right angles to the electric field.
(d) converts to magnetic energy
changes.
If you change the magnetic field in a closed loop of wire, what is created in the loop is a(n)
(a) current.
(b) voltage.
(c) electric field.
(d) all of these.
all of these.
A magnetic force acting on a beam of electrons can change its
(a) direction.
(b) energy.
(c) Both of these.
(d) Neither of these.
direction.
The magnetic field lines about a current-carrying wire form
(a) circles.
(b) radial lines.
(c) eddy currents.
(d) energy loops
circles.
When electrons flow in a thin lamp filament, they experience “friction.” What is the practical outcome of this?
heat and light.
How much current is drawn by a 60-V resistor when a voltage of 12 V is impressed across it?
0.2 A (current = voltage/resistance)