# FSC Physics MCQs Chapter 19 Class 12

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Physics Ch 19 Class 12 Dawn of Modern Physics

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Who proposed matter waves?

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If temperature on Kelvin scale Is reduced to half, what would be the effect on the energy of radiations?

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The energy equivalent to 0.9 mg is? a) 9 x 1091 b) 8.1 x 10″J •

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Debroglie wavelength for an electron and proton moving at same speed are L and 1; respectively. And frequencies are Fe and Fp respectively. Which of the following is corrract.

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Mass of a body with speed of light approaches to:

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When an observer moves with velocity of light, relative to a timing device at rest, he would notice:

NUMS 2015
Physics
Dawn of Modern Physics
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The number of LED segments used in a calculator display:

NUMS 2015
Physics
Dawn of Modern Physics
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Which of following has greatest energy

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According to Einstein, bodies and light rays follow a:

NUMS 2015
Physics
Dawn of Modern Physics
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X-rays are used to investigate:

PMC Sample 3
Physics
Dawn of Modern Physics
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The concept of work function was given by:

PMC Sample 2
Physics
Dawn of Modern Physics
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Minimum energy required to eject an electron from metal surface is called:

UHS 2019
Physics
Dawn of Modern Physics
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The absolute standard of rest is:

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The phenomena in which certain metals emit electrons when exposed to high-frequency light is known as?

NTS 2014
Physics
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In photo-emission from a metal, if light of λ is replaced by light of wavelength λ / 4 , the maximum kinetic energy of the photoelectrons.

UHS 2018
Physics
Dawn of Modern Physics
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The photocell is similar to:

PMC Practice 5
Physics
Dawn of Modern Physics
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When photons are incident on a metal, electrons are emitted. The process is called:

NTS 2016 SMBBMC
Physics
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What will be the energy of an X-ray quantum of wave length 1.0 x 10-10 m?

NTS 2016 SMBBMC
Physics
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Sunlight will emit photo electrons when striking which of the following

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Value of Wien’s constant is?

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The existence of positron was discovered in the:

PMC Sample 3
Physics
Dawn of Modern Physics
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The maximum Compton shift Is at

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The energy of an X-ray quantum of wavelength 1.0 x 10-10 m is:

NTS 2012
Physics
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In Einstein’s theory, the deflection of light is predicted to be exactly as great as it is according to Newton’s theory

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Calculate the energy of a photon, with a frequency of 3.0 x 1018 Hz.
(h = 6.63 x 10-34)

UHS 2019
Physics
Dawn of Modern Physics
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Compton shift is maximum at:

PMC 2021 Tested
Physics
Dawn of Modern Physics
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Which of the following Is correct?

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Fluorescence is produced when cathode rays strike on:

PMC 2021 Tested
Physics
Dawn of Modern Physics
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Calculate the energy of a photon of wavelength 6600 Angstroms:

PMC Practice 5
Physics
Dawn of Modern Physics
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Scattering of photon by electron is termed as:

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Plank׳s constant is analogus to:

PMC Sample 3
Physics
Dawn of Modern Physics
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Which group consists of only electromagnetic waves?

PMC Sample 1
Physics
Dawn of Modern Physics
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Gamma-ray (?) can produce ionization in which of the following way/s?

I. It may lose all its energy in a single encounter with the electron of an atom (Photoelectric effect).

II. It may lose only a part of its energy in an encounter (Compton effect).

III. Very few of very high energy ? ray photons may impinge directly on heavy nuclei, be stopped and annihilated giving rise to electron-positron pairs (The materialization of energy).

NTS 2013
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Who was awarded Nobel Prize (1921) for explanation of Photoelectric Effect?

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In the Compton Scattering experiment the X-ray wavelength change Δλ is ___________. Here h is Planck constant, m rest mass of electron and θ is angle after scattering.

NTS 2019
Physics
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What will the de Broglie wavelength of a 150 g mass moving with a velocity of 50 m/s be?

PMC 2021 Tested
Physics
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A photosensitive material would emit electrons if it is excited by a photon beyond a threshold. To cross the threshold, what should be increased?

PMC 2021 Tested
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In order to produce pair production the minimum energy of photon required is:

NTS 2019
Physics
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When an electron and its antiparticle positron come close enough to each other, they completely convert into radiation energy in the form of photons, this process is called:

NTS 2018
Physics
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Name the scientist who won the noble prize for discovery of energy quanta

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The uncertainty in momentum and position is due to its:

PMC Sample 1
Physics
Dawn of Modern Physics
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Which light photon has the least momentum?

PMC Practice 6
Physics
Dawn of Modern Physics
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) Twin paradox Is consequence of?

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What will be the energy in Joules, when an electron acquires a speed of 10 m/s?

NTS 2016 DUHS & JSMU
Physics
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Earth is a/an frame of reference

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Gamma rays cause photoelectric emission when their energy is

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Value of h Is:

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The electron shows purely a ____ when free.

PMC Sample 2
Physics
Dawn of Modern Physics
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An electron moving with velocity v has momentum 3 x 10 -26 Kg.m/s. The de Broglie wavelength associated with it is ______. Value of h = 6.63 x 10-34 is.

NTS 2019
Physics
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Who was awarded Nobel Prize (1921) for explanation of Photoelectric Effect?

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In Compton’s effect the wavelength of the scattered photon is

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Anti matter theory was proposed by: a) Einstein b) Bohr

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In Heisenberg Principle:

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Photoelectric effect is not produced by:

PMC 2021 Tested
Physics
Dawn of Modern Physics
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Which statement is universally correct?

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In E = aT4  E stands for??

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If frequency of incident light is increased beyond threshold frequency, keeping light intensity constant, then:

NUMS 2019 Reconduct
Physics
Dawn of Modern Physics
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What will be the energy of electron travelling at 10^7 m/s

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Momentum of a photon is?

PMC Practice 2
Physics
Dawn of Modern Physics
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Light photons, each of energy 3.5 x 10-19J falls on the cathode of a photocell. The current through the cell is reduced to zero by taking the cathode to a potential +0.25 V relative to anode. The work function of the cathode is:

UHS 2018
Physics
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What would be Compton Wave shift if X-rays are scattered at an angle of 90 degree?

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Black body emits which of the following radiations:

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The de Broglie wavelength of an electron travelling with a speed of 1.0 x 107m/s is equal to, (h=6.6 x 10-34 Js and me= 9.1 x 10-31 kg)

UHS 2018
Physics
Dawn of Modern Physics
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Planck’s constant is analogous to:

PMC Practice 6
Physics
Dawn of Modern Physics
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The spin of a photon is:

PMC 2021 Tested
Physics
Dawn of Modern Physics
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Black body radiations were first observed by:

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Candela is the luminous intensity, in the perpendicular direction of a surface _________ square meter of a black body at the temperature of freezing platinum under a pressure of 101325 newtons per square meter.

NTS 2013
Physics
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Minimum frequency below which no electrons are emitted from the metal surface is called ______ frequency.

NTS 2016 DUHS & JSMU
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Presence of Photon was confirmed by

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theory of was Relativity proposed by

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Heisenberg uncertainty principle states:

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Which of the following color has maximum energy?

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The Bohr’s postulate for stationary orbits of Hydrogen atoms _____. Here m is the mass of the electron, v velocity, r orbital, and h is Planck’s constant.

NTS 2019
Physics
Dawn of Modern Physics
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Photocell is similar to:

PMC Sample 2
Physics
Dawn of Modern Physics
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Physics is an experimental science which depends heavily on:

NTS 2016 SMBBMC
Physics
Dawn of Modern Physics
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Einstein was given a Nobel prize for:

PMC 2021 Tested
Physics
Dawn of Modern Physics
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The charge of a photon is:

PMC Sample 1
Physics
Dawn of Modern Physics
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The value and units of the Planck constant ‘h’ can be expressed as:

UHS 2019
Physics
Dawn of Modern Physics
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Which behaves as a particle as well as wave

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White light gives spectrum after undergoing:

PMC Sample 2
Physics
Dawn of Modern Physics
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The series limit for the Balmer series of hydrogen spectrum occurs at 3664 A. Calculate Ionization energy of hydrogen atom.

NTS 2013
Chemistry
Dawn of Modern Physics
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A 5 watt LED bulb converts 80% of the power into light photons wavelength 660 nm. What is the number of photons emitted from the bulb in one second.

UHS 2018
Physics
Dawn of Modern Physics
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A Black body is?

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If Compton shift is half of Compton wavelength, then the scattering angle would be:

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Which of the following waves has highest speed?

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Electromagnetic wave theory was proposed by:

NTS 2015 SMBBMC
Physics
Dawn of Modern Physics
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The stopping potential depends on

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