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