Physic 2014 True and False

¡Supera tus tareas y exámenes ahora con Quizwiz!

False

A fuse is an automatic switch that opens when the current reaches a threshold value

False

A hole is an empty energy level in the conduction band

True

A magnetic field exists around any current carrying wire

False

A parallel connection is a type of electric circuit in which there is a single current path

True

A resistor is a device that controls current in electric circuits

False

A resistor is a device that convert chemical energy into electric energy

False

A series connection is a type of electric circuit in which there are multiple paths.

True

A short circuit occurs when a circuit with a very low resistance is formed

False

A transformer may be used to convert direct current to alternating current

True

It is necessary to understand series and parallel circuits to fully understand residential wiring

True

Laser beams are used by surveyors to check the straightness of long tunnels and pipes

True

Lenz's law applies to both motors and generators

True

Like charges repel, whereas opposite charges attract.

True

Like magnetic poles repel; unlike magnetic poles attract

False

Magnetic field lines never form closed loops

True

Magnetic fields exit from the north poles of magnets and enter the south poles of magnets

False

The emission of electrons from a metallic surface depends on the intensity of the incident radiation

True

The energy of an atom (E) depend on 1/n² where n is the principle quantum number

True

The flow of electric charge or current that is equal to one coulomb per second is an ampere

False

The integer value "n" in the equation for energy of vibration can have any value.

True

The polarity of an electromagnet can be determined using the second right-hand rule.

False

The power produced by An AC generator may be positive or negative

False

The spectrum of a gas is a continuous band of colors from red through violet

True

The speed of an electric motor can be controlled by varying the amount of current through the motor

True

The strength of a magnetic field is measured in teslas

True

The total energy of a coil-and-capacitor circuit remains constant

True

The two types of charges, positive and negative, are not created alone, but in pairs.

False

A changing magnetic field produces an electric field with open loop field lines

True

A charged object will induce a separation of charges within a neutral conductor

False

A diode can behave as a low-value resistor that obeys Ohm's Law..

True

A diode consists of both p-type and n-type materials

True

The density of electric field lines is related to the strength of the field

False

The effective AC current is equal to half the maximum current

False

A circuit breaker is a short piece of metal that melts when a current that is too large passes through it

True

A circuit, which includes series and parallel branches, is called a combined series-parallel circuit

False

A current is generated when a wire is moved parallel to a magnetic field

False

AN electron and a proton move with the same speed. The proton has the longer de Broglie wavelength

True

All household devices are connected in parallel because they are designed to operate at the same voltage

True

All matter is composed of quarks and leptons

False

An ammeter consists of a loop of wire in a magnetic field

False

An ampere is a unit used by electric companies to measure electrical energy use

True

An electric circuit is a closed loop or pathway that allows electric charges to flow

True

An electric current is a flow of charged particles

True

An object that exhibits electric interaction after rubbing is described as charged.

True

Charges added on one part of an insulator remain on that part

True

Charges added to a conductor quickly spread over the surface of the object

True

Circuit breaker are connected in series so that the circuit will open in case of dangerously high current

True

As current moves through any circuit, the net change in potential must be zero

True

Atoms emit radiation only when their vibrational energy changes

False

Carbon-12 is used to date objects.

True

Electrons exhibit waves properties such as diffraction

True

Coulomb's Constant (K) is 9.0 × 10⁹ N*m²/C²

True

Electric Charges exist within atoms

True

Electric charge is neither created nor destroyed; it is conserved

True

Electric field lines never cross.

False

Electric potential difference is the change in kinetic energy per unit charge in an electric field

False

Electric potential differences are measured in amperes

True

Electromagnetic waves can travel through empty space

False

Electromagnetic waves travels at the speed of sound

False

Electrons can exist outside of the specified energy levels

True

Electrons cannot be found between energy levels

True

Electrostatics is described as the study of electric charges that can be collected and held in place.

True

Field lines do not actually exist, that are simply a means of providing a model of an electric field.

True

Fuses and circuit breakers protect against the large currents created by a short circuit

False

Hans Christian oersted discovered that a changing magnetic field produces an electric current

True

In a capacitor, the two conductors have equal and opposite charges

False

In a conductors, electric fields do no work on electrons

True

In an electric circuit, fuses and circuit breakers act as safety devices

True

In order to measure the current through a resistor, an ammeter is placed in series with the resistor

False

In self-inductance, the size of the induced EMF is inversely related to how fast the current changes

True

Nuclear fusion can release large amounts of energy

False

Nuclei decay from a more stable form to a less stable form

True

Objects can be charged by the transfer of electrons

True

One coulomb is the charge of 6.24 ×10¹⁸ electrons or protons

False

One kilowatt-hour is equal to the energy consumed by an electric device of 1 W for 1 hour.

False

Opposite charges Repel each other

True

The average power produced by an AC generator is half the maximum power

True

The binding Energies of all nuclei are negative

True

The binding energy of a nucleus is always negative

False

The change in potential Difference depends on the magnitude of the test charge

False

Radioactive nuclei decay to become unstable

True

Radioactivity is a natural process

True

Resistance is a property that determines how much current will flow in a circuit

False

Silicon and germanium are known as superconductors

True

Solid-state devices are built from materials such as silicon and germanium

True

To measure the potential drop across a resistor, a voltmeter is connected in parallel with a resistor

True

Transformers can changed AC voltages with relatively small energy losses

False

Two objects with the same type of charge attract each other.

False

Two points are equipotential if their electric potential difference is greater than zero

True

Voltage dividers are often used with sensors, such as photosensors

True

Water can be both a conductor and an insulator

False

When you lift a book, you decrease its gravitational potential energy

True

Without a fuse or circuit breaker, the current caused by a short circuit easily could start a fire

True

in 1897, J,J Thomson Discovered that all atoms contain electrons


Conjuntos de estudio relacionados

Chapter 5 summary and study questions

View Set

Fundamentals Networking Tech Chapter 2

View Set

OB PrepU Chapter 13: Labor and Birth Process

View Set

C3- Use of electromagnetic waves in communication

View Set

Ch.9-16 Business Communications Final Exam

View Set

Out of My Mind Chapters 11-21 Vocabulary

View Set

Chapter 35: Key Pediatric Nursing Interventions

View Set