Question # 1

Compton scattering experiment seemed to indicate that radiation had

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Wave nature

Particle nature

Wave particle nature

X-rays nature

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

Which configuration is used to connect high impedance source to a low impedance lead.

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CE

CB

CC

BE

Nuclear force as compared to electrostatic force is.

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Weaker and long range

Weaker and short range

Stronger and longer range

Stronger and short range

When of the following radiations are not emitted by electron transitions in atoms.

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Visible rays

Ultraviolet rays

Infrared radiations

Alpha particles

There are how many types of forces or interactions.

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Two

Three

Four

Five

When objects placed in a room are exposed to X- rays they appear

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Violet

Visible

Red

Invisible

At room temperature the potential difference between the two sides of depletion region for silicon is of the order of.

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0.3 v

0.5 V

0.7 V

0.9 V

A factory buy 100 g of a radioactive chemical with a half life of 5 years which decays to a stable compound How much of the chemical will still be radioactive 10 years time.

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25 g

50 g

75 g

100 g

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.

Which of the following is not a mode of radioactive decay.

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Positron emission

Electron capture

Fusion reaction

A decay

A perfect back body

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Is a perfect absorber of all radiations

Is a perfect reflector of all radiations

Is a perfect reflector of visible lights radiations

Is a brownish object

Which particle are not emitted by a radioactive substance.

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Alpha particles

Beta particles

Gama particles

Neutrons

x-rays cannot produce

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Photoelectron

Compton electron

Electron positron pair

All of these

Which particle interact via all fundamental forces.

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Leptons

Hadrons

Muons

mesons

In the experiment of production of X rays electrons are accelerated towards the anode by

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Thermionic emission

Potential difference

Breaking potential

Cut of current

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

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total life

Half life

Mean life

Curie

In Compton's effect it was considered that X-rays consist of

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Electrons

Holes

Neutrons

Protons

The average energy released per fission of U is about

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200 eV

2 keV

2 MeV

200 MeV

If an object moves with velocity of light the apparent mass of the object as compared to list original mass is

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greater

Smaller

Same

zero

The critical mass of a fission reaction is.

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The mass to start a nuclear fission reaction

The minimum mass for chain reaction

The size of the reactor core

The size of fuel plus the size of moderator

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PPSC Physics Chapter 7 Modern Physics MCQs With Answers

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