Physic 2014 Multiple Choice
Which of the following statements is incorrect?
A photon has energy but no momentum
A/An ________ is a device that is used to measure the current in any branch or part of a circuit
Ammeter
Which device measure the current in a circuit?
Ammeter
The flow of electric charge or current equal to one coulomb per second is a/an____
Ampere
An electromagnetic wave is produced by:
An accelerating charged particle or changing magnetic fields
A/An____ is the wire coiul of an electric motor
Armature
the direction of the force on a positive test charge near another positive charge is _____ the other charge
Away from
Electric field lines are directed _____ positive charges and ____ negative charges
Away from, toward
A____ is described as a device that converts chemical energy to electric energy
Battery
Positively charged particles in an electric or magnetic field
Bend in the opposite way as electrons
The Compton effect supports
Both models of light
____ are not valid units for the measurement of electric potential difference
C/J
_______ is described as the ratio of an object's stored charge to its electrical potential difference
Capacitance
A/An ______ is described as an electric device used to store charge, usually two conductors separated by an insulator
Capacitor
______difference are measured in volts
Capacitor
A/An _____ is described as an automatic switch that acts as a safeguard in an electric current
Circuit breaker
laser light produces
Coherent light
When a photon is scattered, the increase in wavelength is called:
Compton effect
How can a galvanometer be converted into an ammeter to measure large currents?
Connect a shunt in parallel with the galvanometer
When two bodies are charged, the total charge before and after charging remains the same because of:
Conservation of charges
In a series circuit, each circuit element has the same
Current
If a resistor is added to a parallel circuit, the equivalent resistance:
Decreases
Which function correctly expresses how to determine the energy of a photon?
E=hf
A/An _____ is described as a closed loop or pathway that allows electric charges to flow
Electric circuit
A/An ______ is described as the flow of charged particles
Electric current
A/An _____ is the field that exist around any charged object
Electric field
_______ provide a picture of an electric field indicating a field's strength
Electric field lines
______ are strongest near the sharp points of sharply pointed conductors
Electric fields
_____ and ________ can act from great distance
Electric force, gravitational force
A/An____ is an apparatus that converts electricity energy to rotational kinetic energy
Electric motor
______ is described as the change in potential energy per unit charge in an electric field
Electric potential difference
A/An _______ is a magnet created when current flows through a wire coil.
Electromagnet
A disturbance int he combined electric and magnetic field that travels through space is a(n)______
Electromagnetic wave
In a capacitor, the two conductors have _____ charges
Equal and opposite
In an ideal transformer, the electric power delivered to the secondary circuit______ the power supplied to the primary circuit
Equals
The distance between two charges q(a) and q(b) is r, and the force between them is F. what is the force between them if the distance between them is doubled?
F/4
Which rule is used to find the direction of force produced by electromagnetic induction?
Fourth right hand-rule
A/An_____ is a device that is used to measure very small current
Galvanometer
Which device is used to measure very small currents
Galvanometer
The material to be analyzed enters a mass spectrometer in the form of a_____.
Gas
The photoelectric effect demonstrates that a photon
Has kinetic energy only
Which principle states that it is impossible to measure precisely both the position and momentum of a particle at the same time?
Heisenberg uncertainty principle
James Maxwell's experiments were proven to be correct through the work of ____.
Hertz
If a resistor is added to a series circuit, the equivalent resistance:
Increases
In a mass spectrometer, if the potential difference used to accelerate the ions increases, the radius of the circular path____.
Increases
A step-up transformer______ and______
Increases voltage and decreases current
The energy of a photon is:
Inversely proportional to its wavelength
The number of turns on the primary coil of a step-down transformer_____ the number of turns on the secondary coil.
Is greater than
Atoms of the same lement with different masses are called
Isotopes
How does the electron orbital radius in a hydrogen atom change if the principal quantum number is increased from 1 to 3?
It becomes nine times of r1
A/An_____ is a unit of energy, whereas a ______ is equal to one joule per coulomb
Joule, Volt
A/An ____ is an energy unit used to measure electric energy use by power companies
Kilowatt-hour
A_______ is equal to 1000 watts delivered contionously for 3,600 seconds
Kilowatt-hour
An example of an electromagnetic wave is:
Light
_____ charges repel, whereas _____ charges attract
Like, Opposite
An electromagnetic wave with a low frequency has a(n)
Long wavelength
A/An____ is described as the area around a magnet where other magnets would be accelerated
Magnetic field
A/An____ is The number of magnetic field lines that pass through a surface
Magnetic flux
The charge -to-mass ratio of a proton is ______ the charge-to-mass ratio of an electron.
Much smaller than
An area with excess electrons has a net ____ charge; an area with a deficit of electrons has a net___ charge.
Negative, Positive
The number of current paths in a series circuit is:
One
Which rule is used to find the direction of force acting on a current-carrying wire in a magnetic field?
The third right-hand rule
The_____ is a method used to determine the direction of the force on a current carrying wire in a magnetic field
Third right hand rule
Which of the following is not an example of a dielectric
Vaccuum
A/An ______ is a unit equal to one joule per coulomb
Volt
A/An _______ is used to measure the voltage drop across a portion of a circuit
Voltmeter
A/An____ is described as a device that is used to measure voltage drop across any part of a circuit
Voltmeter
What are the units of electromotive force
Volts
The energy of a photon is inversely proportional to its
Wavelength
Which of the following materials is the best conductor of electricity?
Wet Skin
Which of the following statements about X rays is incorrect?
X rays can easily penetrate bones and any thick material
A type of high-frequency electromagnetic wave discovered by wilhelm roentgen is the____.
X-ray
Electric forces can be either repulsive or attractive, whereas gravitational force is always:
attractive
The strength of a/an _____ is equal to the force on a positive test charge divided by the strength of the test charge
electric field
Bohr suggested that when an atom absorbs a photon, the atom's ____ increases by an amount equal to that of the photon
energy
A continuum of wavelengths is emitted by _____.
incandecscent light
The principal quantm number for an atom is represented by
n
Electric potential difference are measured in_____.
volts
A series circuit has four resistors. The current through one resistor is 810 mA. How much current is supplied by the source?
810mA
The maximum voltage of a typical household outlet in the United States is_____
170 V
Which of the following expressions shows the correct relationship between 1T (1 tesla) and other common units?
1N/(A.m)
Scientist uses large______ dish antennas to detect radio waves from deep space.
Parabolic
A/An____ is described as a type of circuit in which there are several current paths
Parallel circuit
In the photoelectric effect, light displays properties that are like a ____.
Particle
Electromagnetic waves have properties that are ____ and___
Particle-like and wave-like
Which phenomenon demonstrates the particle nature of light?
Photoelectric effect
A mass spectrometer is used to measure the charge-to-mass ratios of_____.
Positive ions
What is a unit consisting of an antenna, a coil-and-capacitor circuit, a detector, and an amplifier called?
Reciever
Which statement about magnetic monopoles is false?
Research scientists use them for internal medical testing applications
A_____ is described as a device with specific resistance and is used to control current
Resistor
A/An ______ is described as a type of circuit in which there is only a single current path
Series circuit
A/An______ is a type of electric circuit in which there is a single current path.
Series connection
A/An _____ occurs when a very low resistance circuit is formed and can easily start a fire
Short circuit
THe higher the frequency of light energy, the ______ the wavelength
Shorter
A/An _____ is a long coil of wire with many loops used to create a large magnetic field
Solenoid
The velocity of an electromagnetic wave depends on:
The medium through which it travels