Question # 1

What is the relativistic version of the Schrodinger equation.

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Klein Gordon equation

Laplace equation

Quadratic equation

Binomial equation.

In which reaction two or more small light nuclei nuclei come together or fuse to form a large nucleus.

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Radioactivity

Radioactivity dating

Nuclear fusion

Nuclear fission

The number of electrons in U nucleus are.

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92

235

zero

143

The reciprocal of decay constant lamda of a radioactive substances is equal to.

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total life

Half life

Mean life

Curie

The chain reaction is controlled by a series of rods usually made of.

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uranium

Cadimium

Boron

Steel

Specially designed solid state detector can be used to detect.

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Alpha particles

Beta particles

Gama rays

X- rays

What will be excitation energy in the third orbit of hydrogen atom.

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0.66 eV

0.85 eV

1.5 eV

5.4 eV

Which of the following particles leave no trail in a cloud chamber.

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Electrons

Protons

Alpha particles

Neutrons

The ionization energy for hydrogen atom is

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-11.6 eV

-12.6 eV

-13.6 eV

-19.6 eV

One particle having zero mass and zero charge is.

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Positron

Electron

Neutrino

Neutron

Which one the following is not a component of a Bipolar junction Transistor

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Base

Emitter

Collector

Grid

Which of the following propagates at the same speed as velocity of light.

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Heat waves

Sound waves

Shock waves

Beta particles

One becquerel is equal to

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Decay of orie radioactive atoms per second

Decay of 10 radioactive atoms per secnd

Decay of 100 radioactive atoms per second

Decay of infinity radioactive atoms per second.

The half life of radium -226 is

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1620 years

45 x 10⁹ years

3.8 days

23.5 minutes

In the experiment of photo electric effect the minimum frequency of photons at which electrons are emitted from a metal surface is called.

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Critical frequency

Typical frequency

Threshold frequency

Surface frequency

Cs - 137 is a radioisotope used ot determine the thickness of the walls of steel pipes Cs 137 is chosen because it emits

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Radiowaves

Alpha particles

Beta particles

gama particles

LASER beam my be measure very large distance because it is.

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Inidirectional

coherent

Monochromatic

Not absorbed

The phenomenon in which a photon of frequency 'f' is scattered by an electron and the scattered photon has frequency f <f is known as.

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Pair production

Pair annihilations

Photoelectric effect

Compton's effect

Marie Curie and Pierre Curie discovered two new radioactive elements which are.

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Uranium and radkum

Platinum and radium

Polonium and radium

Crypton and radon

According to Max. Planck, energy is released or absorbed in discrete packets called.

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quanta

Meson

Energy shells

Position

The maximum K.E. with which photoelectrons are emitted depends very strongly on the.

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Intensity of incident light

Electric field near the photocathode

Frequency of incident light

Polarization of incident light

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PPSC Physics Chapter 7 Modern Physics MCQs With Answers

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