PHY101 Quiz-4 Solution Fall 2022 (21 to 41)

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In this post we are providing you PHY101 Quiz-4 Solution Fall 2022 (21 to 41) 100% correct or right solution.

Semester Quiz # 04

Dear Students,

It is to inform that Semester Quiz # 04 has been opened today and it will remain open for 48 hours only. You are strongly advised to take this activity seriously and make sure to submit the quiz within the given date. No quiz submission requests will be entertained later in any case due to any reason.

PHY101

QUIz 4

You are being informed that the 4th online quiz of Physics (PHY101) is going to held on 07^th March, 2022 to 08^th March, 2022.  The quiz will consist of Multiple Choice Questions (MCQs) and cover Lessons 23 to 43.

The reason there are two slits, rather than one, in a young’s experiment is:

To create a path length difference….confirm from net

Which of the following types of electromagnetic radiation travels at the greatest speed in vaccum?

(Radio, gamma, x)rays .. all options….confirm

Electric energy is measured :

Watt….confirm from ent

The lenz’s law refers to :

Induced current

The films formed due to detergents(soap/shampoo) are due to

A free electron and a free proton have the same kinetic energy . this means that, compared to the matter wave associated with the proton, the matter wave associated with the electron has:

A longer wavelength and a smaller frequency …..confirm from net

 

Of the following. Compton scattering from electrons is most easily observed for:

X rays

 

Of the following which might NOT vanish over one cycle of a cyclic process?

The work done by the substance….confirm from net

The most refined form of matter is:

Light

How could the unit of potential difference, the volt, also be written?

J/C

In Compton scattering from stationary particles the maximum change in wavelength can be made smaller by using.

More massive particles

Hotness or coldness of an object is represented in terms of:

Temperature

 The unit of thermal conductivity might be:

Cal/(cm*s*C?)

During the time that latent heat is involved in a change of state.

The temperature does not change

A laser in a compact disc player generates light that has a wavelength of 780 nm in air. The light then enters into the plastic of a CD. If the index of refraction of plastic is 1.55, the speed of this light once enter the plastic is ___________.

x 10^8 m/s 

Antiparticle of electron is

Positron…..confirm from net

 

When some dielectric is inserted between the plates of a capacitor then capacitance

Increases….confirm from net

The centre of Newton ring is dark due to:

Destrictive interference

If two objects are in thermal equilibrium with each other:

They cannot be at different temperatures….confirm from net

The graphical representation of Ohm’s law is

Straight line…..confirm from net

A particular device transmitted a signal in the form of electromagnetic waves of frequency 7.5 * 108 Hz. What is the wavelength of the signal?

0.4m

Which physical quantity is produced by a calculation where a charge is multiplied by a potential difference (p.d)?

Energy….confirm form net

A transparent refracting medium bounded by the two curved surfaces called:

Prism….confirm from net

It is more di? Cult to measure the coe? Cient of volume expansion of a liquid than that of a solid because?

The containing evessel aslo xpands….confirm form net

 

The product of resistance and capacitance is called

Time….confirm from net

The potential difference between the ends of a conductor is 12 V. How much electrical energy is converted to other forms of energy in the conductor when 100C of charge flows through it?

1200….confirm form net

When we accelerate the charge, which types of waves are produced?

Electromagnetic waves

Due to relative motion of observer and the frames of reference of events, time always:

statics itself

The allowed energy states of atoms or molecules can be described by a set of _______.

Quantum numbers……confirm

Probability values are assigned on a scale of

0 to 1….confirm

The magnitude of the momentum of a particle can never exceed:

E/c, where E is its total energy

 

 

The ratio of the size of image to the size of object.

Angular magnification

When white light passes through a prism, it splits into _____ colors.

7…….confirm from net

A thermometer indicates 98.6?C. it may be:

IN a cup of hot tea

Tesla is a unit of

Magnetic flux

A light entering into glass prism from air does not give change in its:

Frequency

The total energy in an LC circuit is 5.0 x 10- 6 J. If L = 25mH the maximum current is:

20mA

Electromagnetic waves do not transport:

Charge

A heat of transformation of a substance is:

The energy per unit mass absorbed as heat during a phase transformation

Which of the following is true of all virtual images?

None of these

2dSin0=mA is called

bragg equation

No lens is perfect because ___________.

They suffer from aberration

 

A basic postulate of Einstein’s theory of relativity is

The laws of physics must be the same of obersvers moving with uniform velocity relative to each other.

Evidence that a gas consists mostly of empty space is the fact that

Heating a gas increases the molecular motion

The number of turns becomes double, but length remain same, then magnetic field in the solenoid become.

Double

 

Which of the following electromagnetic radiations has photons with the greatest energy?

X rays

When two objects come to common temperature, the body is said to be in:

Thermal equilibirium….confirm from net

If electric and gravitational force on an electron in a uniform electric field balance each other, then the intensity of electric field will be:

Mg/q

Electromagnetic waves do not transport:

Charge

During a slow adiabatic expansion of a gas

No energy  enters or leaves as heat

 

 

A free electron and a free proton have the same kinetic energy. This means that, compared to the matter wave associated with the proton, the matter wave associated with the electron has.

A longer wavelength and the same frequency

The quantity delta(V)/delta(r) is called

Potential gradient

If two objects are in thermal equilibrium with each other.

They cannot be at different temperatures

A consequence of Einstein’s theory of relatively is:

Moving  clocks run more slowly than when they are at rest

In order that a signal process is both isothermal and isobaric

A change of phase is essential

 

The specific heat of a substance is:

The amount of heat energy per unit mass to rales the temperature of the substance by 1?C

The electron states that constitute a single shell for an atom all have:

The same value of n

An isothermal process for an ideal gas is represented on a p-V diagram by:

A portion of a hyperbola

The concept of an electric field lines is introduced by:

Faraday

The current in a car headlamp is 2.0A. The headlamp is switched on for 30 minutes. How much charge passes through the headlamp?

360 C

In some movies, you sometimes see an actor looking in a mirror and you can see his face in the mirror. During the filming of this scene, what does the actor see in the mirror?

The movie camera

The pauli exculusion principle is obeyed by:

All particles with spin quantum numbers of ½

 

The focal length of convex lens is:

Positive

An electron (m=9.11 * 10-31kg) has a speed of 0.95C. its kinetic energy is;

1.8*10-31J

An electron (m=9.11 x 10-31kg) has a speed of 4.0.95C. Its kinetic energy is:

1.8x10-13J

 

An electron (m=9.11 x 10-31kg) has a momentum of 4.0x10-22kg*m/s. Its kinetic energy:

6.3*10-14J

Force on a charged particle is zero when projected at angle with the magnetic field

0 degree

Heat is:

Energy transferred by virtue of a temperature di?erence

When a charge is projected perpendicular to a uniform magnetic field, its path is:

Circular

If potential difference across two plates of a capacitor is doubled, then energy stored in it will be:

Four times

In case of metallic conductors, the charge carriers are.

Electrons

Room temperature is about 20 to 22 degrees on the:

Celcius scale

Room temperature is about 68 to 72 degrees on the

Fahreheit scale

As compared to distance measured by an observer on Earth, the distance from earth star measured by an observer in a moving spaceship would seem:

Same

Evidence that a gas consists mostly of empty space is the fact that

The density of a gas becomes much greater when it is liquefied….confrim

 

For an electron, the rest mass energy is:

0.511 MeV………confirm from net

Antiparticle of electron is:

Position

According to the first law of thermodynamics, applied to a gas, the increase in the internal energy during any process

Equals the heat input plus the work done on the gas….confirm from net

The approach to personality stresses that people possess a basic goodness, and have a natural tendency to grow to higher levels of functioning is.

humanistic….confirm from net

In a photoelectric experiment at a frequency above cut off, the stopping potential is proportional to :

The energy of the most energetic electron after it is ejected….confirm from net

There is a temperature at which the reading on the kelvin scale is numerically:

Equal to that on the Celsius scale

When you stand in front of a plane mirror, your image is:

Virtual, erect and the same size as you

When a ray of light travels from a lesser denser medium to denser medium then _______.

It bends towards the normal

Entropy measure the:

Energy of a system

The theoretical uppr limit for the frequency of electromagnetic waves is:

There is no upper limit

The special theory of relativity is applicable to the object moving with maximum velocity equal to:

Speed of light

According to the special theory of relativity:

All forms of energy have mass-like properties

In constructing a thermometer it is necessary to use a substance that:

Undergoes some change when heated or cooled

A particle with rest mass m moves with speed 0.6c. its kinetic energy is:

0.25 mC2

 

J.J Thompson’s measurement of e/m for electrons provides evidence of the:

Particle nature of matter

Polarization means __________.

To alter the wavelength of the light

Emission of electron by metals on heating is called

Thermonic emission

The specific heat of a substance is:

the amount of heat energy per unit mass to raise the temperature of the substance by 1?C

 

An erect object is in front of a convex mirror a distance greater than the focal length. The image is:

Virtual, erect, and smaller than the object…..cconfirm from net

The apperarance of colors in thin film is due to:

Interface…..confirm from net

A student rubs a rod held in his hand. Which action causes the rod to gain a large electrostatic charge?

Rubbing a polythene rod with a woolen duster

Two parallel straight wires carrying current in same direction

Attract each other

 

One tesla is equal to

N/Am…..confirm from net

The process for which entropy remains constant is:

A reversible process

The appearance of colors in thin film is due to:

interference

Greenhouse gases absorb ______ radiation

Infrared

The theoretical uppr limit for the frequency of electromagnetic waves is:

There is no upper limit

Heat has the same units as:

Work

Capacitance of a capacitor in vaccum is given by:

A eo /d

AN electron in a K shell of an atom has the principal quantum number:

N =1

When an electromagnetic waves meets a reflecting surface, the direction taken by the reflected wave is dertermined by:

The angle of incidence

Capacitive reactance Xc is

1/2(pi)fc

Bending of light around the edges of an obstacle called:

Diffraction

In RL series circuit phase angle is given by:

Tan-1(wl/R)

Interface of light is evidence that:

Light is a wave phenomenon

 

In a photoelectric e? ect experiment at a frequency above cut o? the number of electrons ejected is proportional to:

The number of photons that hit the sample…..confirm from net

In a photoelectric e? ect ecperiment the stopping potential is:

The electric potential that causes the electron current to vanish…confirm from net

 

In an adiabatic process:

The work done by the environment on the system equals the change in internal energy….confirm from net

A free electron and a free proton have the same kinetic energy . This means that, compared to the matter wave associated with the proton, the matter wave associated with the electron has:

A longer wavelength and the same frequency…confirm from net

Polarization experiments provide evidence that light is:

A transverse wave….confirm from net

If light of low wavelength is used in young’s double slit experiment, then width of the fringe will:

Decreases….confirm from net

Lenz’s law is in accordance with law of conservation of

Energy….confirm from net

AN LC series circuit with an inductance L and a capacitance C has an oscillation frequency f. Two inductors, each with inductance L, and two capacitors, each with capacitance C, are all wired in series and the circuit is completed. The oscillation frequency is:

F

The known laws of electromagnetism before James Clerk Maxwell were following EXCEPT:

Faraday’s Law

A particle having 2e charge falls through a potential difference of 5V energy acquired by it is.

10eV

According to relatively theory a particle of mass m with a momentum of 2mc has a speed of:

c/2

If the kinetic energy of a free particle is much less than its rest energy then its kinetic energy is proportional to:

The square of the magnitude of its momentum

The two metallic strips that constitute some thermostats must di? Er in:

Coefficient of linear expansion

Phase difference between V and I of an AC through resistor is:

0 degree

Average value of current and voltage over complete cycle is:

zero

A detector is used to detect the speed of a particular wave. If the frequency of an electromagnetic signal is 400 MHz, the speed detected by detector is _______.

300000 km/s                            

Inductive reactance XL of an inductor is:

2π f L…..confirm from net

An inductor may store energy in its:

Magnetic field….confirm from net

If velocity of a conductor moving through a magnetic field B is made zero then motional emf is:

-vBL      

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