physics lab pre and post quizzes

An RL circuit is connected to a constant DC voltage input of +5 V. When we turn on the power, then at that instant the potential across the inductor will be 0 V can take any value Correct! -5 V

-5 V

The typical radius of an atom is closer to 10^(-1) m Correct! 10^(-15) m 10^(-3) m No answer text provided.

10^(-15) m

The plates of an isolated parallel plate capacitor with a capacitance C carry a charge Q. What is the capacitance of the capacitor if the charge is increased to 2Q? C/2 2C None of these Correct! C

C

The resistance of the semi-conductor we studied in the lab Exhibited an Ohmic behavior Correct! Exhibited a non-Ohmic behavior

Exhibited a non-Ohmic behavior

The relative mean square (rms) quantity for electric potential in AC is ALWAYS Less than the numerical average of AC electric potential Correct! Greater than the numerical average of AC electric potential Zero

Greater than the numerical average of AC electric potential

The term P·V in the ideal gas law has units of Correct! Joule m^3 Newton Pascal

Joule

Two resistors R1 and R2 are run in parallel AC circuit but R1 get's hotter faster than R2. Then it would be safe to assume that Nothing can be derived R2<R1 R1=R2 Correct! R2>R1

R2>R1

The inductive charging (i.e. the reason why we used the smaller dome in the lab) acquires the opposite change than the main Van de Graaf (VDG) dome is because None of these on the list The VDG is using AC current Correct! The repelling forces between electrons The negative charge of the electron

The repelling forces between electrons

From our experiment heating oil and water, we deduced that the speed at which each liquid heats up also can depend on None of these apply Just the specific heat Correct! The size of the molecules of the liquid

The size of the molecules of the liquid

The phase difference between the AC voltages of two resistors in series depends on Their respective current Their respective resistivity Frequency Correct! There is no phase difference (i.e. zero)

There is no phase difference (i.e. zero)

During you Boyle's law experiment, why did you wait for a few seconds each time you pressed down the syringe? To make sure that the process is isobaric (constant pressure) None of these apply To make sure that the process is adiabatic Correct! To make sure that the process is isothermal

To make sure that the process is isothermal

When accelerated electrons collide with air molecules one of the likely "byproducts" is another molecule there can be no collisions between electrons and molecules Correct! a photon

a photon

The ideal gas law describes How fast gas molecules move and collide under different temperatures The momentum exchange from collisions between molecules as a function of temperature Correct! All of the above The force exerted by collisions between molecules and the walls where the gas is contained

all of above

The breakdown voltage of a gas depends on its density temperature partial pressure all of these

all of these

The size of the VDG dome determines Correct! All of these on the list How long the sparks can reach The electric potential magnitude on the surface of the sphere How much charge is stored

all of these

Three 10-Ohm resistors in series made from the same material always share the same Correct! all these on the list voltage current resistivity

all of these

Two resistors in parallel are made of the same material and have the same length and cross section. These two resistors will always have there same voltage current resistivity resistance Correct! all of these on the list

all of these

The PV=constant implies that dT=0 d(PV)=0 Correct! all on the list dE=0

all on list

At its natural state air is an electrical conductor Correct! an electrical insulator

an electric insulator

In your lab experiment, you deduced that as the AC source frequency increases in an RC in series, the rms voltage across the resistor approaches zero Correct! approaches the rms of the source none of these on the list

approaches the rms of the source

The charges on a randomly-shaped conductor always reside at its center depends on the material at the surface

at the surface

In your lab experiment, you deduced that the speed of a capacitor discharging in a DC circuit depends on Correct! both on capacitance and resistance none of these on the list the capacitance only the resistance only

both on capacitance and resistance

One of the major differences between DC and AC (sine-wave) that when the circuit includes a capacitor is that capacitor has resistance, but independent of frequency the capacitance depends on frequency Correct! capacitor has resistance, but dependent on frequency none of these on the list

capacitor has resistance, but dependent on frequency

Two capacitors in series that have the same charge density and same plate separation will always have the same capacitance voltage Correct! charge none of these

charge

An electrostatic luminous spark is a result of the photons produced by the electric field electron attraction collisions between ions or electrons and air molecules none of these

collisions between ions or electrons and air molecules

Three 10-Ohm resistors in series made from the same material will ALWAYS share the same current resistivity voltage Correct! current, voltage and resistivity none of these on the list

current, voltage and resistivity

The area contained under a P-V graph relates to Temperature None of these apply Heat Correct! Energy

energy

In an AC (sine-wave) domain, the time-series of the voltages between the capacitor and the resistor will ALWAYS be exactly 180° out of phase exactly in phase none of these Correct! exactly 90°

exactly 90°

A student argues that the light that is produced during the VDG spark is due to the thermal expansion of the surrounding air. This statement is True Correct! False

false

A transformer is a way to increase the electrical energy from one coil to the adjacent coil. This statement is true Correct! false true under special circumstances false under special circumstances

false

Both Kirchhoff rules are NOT valid for AC current. This statement is True Correct! False Depends on the AC frequency

false

Faraday's law only applies to materials that are paramagnetic (i.e. can be magnetized) such as iron. This statement is Correct! False True

false

In the original Newton's law of cooling the type of liquid is utterly irrelevant. This argument is True Correct! False

false

Ohm's law is ALWAYS obeyed across all electronic devices True Correct! False

false

Ohm's law is always obeyed across all electronic devices (e.g. bulbs, resistors, semi-conductors etc): Correct! False True

false

One argues that because the proton is much larger in mass than the electron, it creates a much stronger electric field at the same distance than the electron does. This statement is True It depends on the proton or the electron Correct! False

false

Someone argues that a transformer, in fact, increases the electric potential energy of the outer coil. This person's argument is blatantly Correct! false true

false

The neutron is much less massive than the proton Correct! False True

false

The Joule's law of heating suggests a linear relationship between temperature and time. What we actually observed was Correct! Far from a straight line Indeed a straight line

far from a straight line

The charges generated by the VDG are because of Electrical forces Correct! Frictional forces None of these apply Coulomb forces

frictional forces

Inductance, the same way as capacitance and resistance in an AC domain are properties of Correct! geometry none of the above frequency

geometry

Capacitance depends on Correct! geometry and dielectric only both voltage and charge none of these charge voltage

geometry and dielectric only

The relative mean square (rms) quantity for electric potential in AC is ALWAYS Correct! greater than the numerical average of AC electric potential this relationship depends on the AC frequency lower than the numerical average of AC electric potential

greater than the numerical average of AC electric potential

The basic function of an oscilloscope is to return the electric potential difference across ANY element in a circuit with respect to none of these on the list Correct! ground the voltage source

ground

The basic function of an oscilloscope is to return the electric potential difference across ANY element in a circuit with respect to none of these on the list the voltage source Correct! ground

ground

The specific heat of two different liquids at the same temperature and pressure are Correct! likely different likely the same

likely different

In your DC experiment, when the capacitor was just beginning to charge the current in the circuit was between maximum and minimum minimum Correct! maximum

maximum

We observed that the temperature probe near the bottom of the canister containing our liquid exhibited Less time variations Correct! more time variations Both deep and shallow probes were almost identical

more time variations

A photon has Correct! no charge positive charge negative charge depends on the type of the photon

no charge

Two different resistors in series connected to AC supply will ALWAYS exhibit a voltage phase difference that depends on their respective resistivities Correct! no voltage phase difference the behavior depends on the AC frequency a voltage phase difference that depends on their respective resistances

no voltage phase difference

A Faraday cage can be constructed from Correct! none of these a non-conductor a semi-conductor an insulator

none

The sound from the electrostatic luminous spark we observed in the lab is a result of The electron reduction from excited atoms Correct! None of these on the list The electron production from excited atoms The photons produced from excited atoms

none

On which of the following parameters does the heat contained within an ideal gas depend? Correct! None of these apply Volume Temperature Pressure

none apply

On which of the following parameters does the heat contained within an ideal gas depend? Correct! none of the above volume all of the above temperature pressure

none of the above

In an AC (sine-wave) domain, the time-series of the voltages between the capacitor and the entire circuit will ALWAYS be exactly 180° out of phase Correct! none of these exactly in phase exactly 90°

none of these

The capacitance will increase if one decreases the charge increase the plate separation increases the voltage Correct! none of these on the list

none of these

The transformer we dealt with in this lab was a Correct! none of these on the list step-down ideal transformer step-up ideal transformer

none of these

The charges on the VDG reside depends on the dimensions of the VDG at the center Correct! on the surface

on the surface

In the lab we experimented on resistors in series in the AC domain. When we increased the frequency without changing anything else, we observed that the current of the circuit Changed Correct! Remained the same

remained the same

In your lab experiment, you deduced that as the AC source frequency increases in an RC in parallel, then the rms voltage across the entire circuit goes to infinity approaches zero Correct! remains the same

remains the same

Ohm's law if applied to two coils in series treats the equivalent inductance the same way as Correct! resistors none of these on the list capacitors No answer text provided.

resistors

Two beakers contain two liquids of the same mass. We heat them to the same final temperature, without any phase changes occurring. The liquid that heats faster has this has nothing to do with specific heat Correct! smaller specific heat than the other greater specific heat than the other

smaller specific heat than the other

When lowering the frequency in an AC LR circuit then the inductance (L) decreases the current It can be, either way, it depends on the value of the inductance increases the voltage Correct! stays the same

stays the same

Inductive charging is due to transfer of charges from one medium to the other none of these the Coulomb force the size of the electron

the Coulomb force

One of the major differences between DC and AC that when the circuit includes a capacitor and a resistor in series then the capacitance depends on frequency no element in the circuit depends on frequency Correct! the capacitance reactance depends on frequency the resistance depends on frequency

the capacitance reactance depends on frequency

Heat is a form of energy that relates to the the energy flow between same temperatures Correct! the energy flow from hot to cold the energy flow from cold to hot

the energy flow from hot to cold

A coil (inductor) is in series with a resistor and AC source. We turn on the power. The moment the current is trying to enter the coil then none of these on the list the inductor will produce a magnetic field which will further induce a current with the same direction as the current in the circuit the inductor will do nothing besides storing electric energy Correct! the inductor will produce a magnetic field which will further induce a current with direction opposite to the current in the circuit

the inductor will produce a magnetic field which will further induce a current with direction opposite to the current in the circuit

In your lab experiment, you observed that the discharging capacitor would exhibit Correct! the opposite polarity than it was charged at the same polarity than it was charged at

the opposite polarity than it was charged at

The way we tried to simulate an adiabatic decompression in our experiment was by ensuring that Correct! The process was fast The temperature remained constant None of these apply The volume remained constant

the process was fast

At any given time there are electrons in the air that we breathe False Correct! True

true

Momentum exchange between electron collisions is one of the parameters that determines the resistivity of a wire. This statement is Correct! True False

true

Momentum exchange between electrons is one of the parameters that determines the resistivity of a wire. This statement is False Correct! True

true

Ohm's law in AC and DC domain treats an equivalent resistor (i.e. combining more than one resistors into one) the exact same way. This statement is Correct! True False

true

Ohm's law in AC and DC domain treats the equivalent resistance (i.e. combining more than one resistors into one) the exact same way. This statement is No answer text provided. Correct! True False

true

Someone argues that denser liquids must also have higher specific heat. Solely based on your experimental results, this argument is likely False Correct! True

true

Someone argues that we can freeze a liquid if we apply extreme pressure on it. This argument is False Correct! True

true

The elapsed time we considered in order to find the liquid with the higher specific heat DID play a role. Based on your observations this argument is Correct! True False more information is needed

true

The electron is less massive than the proton False Correct! True

true

In your lab experiment, you considered a capacitor and resistor in series in AC (sine-wave) domain. Did the time-series of the voltage across the capacitor ever become zero? no Correct! yes

yes

In this lab, you learned that if a coil is connected to a DC source, the moment we turn on the switch the current going through the coil will be can be either or non zero Correct! zero

zero

Inside a Faraday cage the electric field is can have any value Correct! zero

zero

The electric field at the center of the VDG dome is maximum minimum but NON zero Correct! Zero

zero

An adiabatic process exchanges Correct! zero heat with the environment zero pressure with the environment zero temperature with the environment zero volume with the environment

zero heat with the environment