Question # 1

Pair production can take place only when energy of radiation is equal and greater than 1.02 MeV, thus correct option is.

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X rays

Gama rays

Heat Radiation

Ultraviolet rays

Compton effect proves.

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Wave nature of radiation

Wave nature of particle

Dual nature of particle

Particle nature of radiations

Using relativistic effects the location of an air craft after an hour fight can be predicated about

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20 m

50 m

760 m

780 m

The quantity/factor h/m_oc has the dimensions of.

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Length

Time

Mass

Energy

The numerical value of Compton wavelength is equal to

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3.43 x 10^-12 m

1.43 x 10^-12m

2.43 x 10^-12m

0.43 x 10^-12m

The uncertainty principle was given by

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De-Broglie

Heisenberg

Einstein

Max Planck

Photo electrons are emitted y using visible light when the metal is.

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sodium

Copper

Nicked

Cobalt

By modern system of NAVSTAR, the speed any where on the earth can be determined to accuracy about.

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20 ms-1

10 ms-1

2 cms-1

2 ms-1

Which one of the following physical quantities change with relativistic speed?

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Length

Time

Mass

All of above

In the equation if f₂ > then

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Energy of Black body radiation depends upon

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Nature of surface of body

Nature of material of body

Shape and size of body

Temperature of the body

1 kg mass will be equivalent to energy.

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9 x 10⁸ J

9 X 10¹² J

9 X 10¹⁶ J

9 X 10¹⁹ J

The unit for Plank's constant is:

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Js^-1

Jm

Js

Jm²

The minimum energy required for occurrence of pair production is:

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1.022eV

1.02keV

1.02Me.V

1.04MeV

The converses of annihilation of matter is:

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Photoelectric effect

Relativistic effect

Pair production

Compton effect

Which is the most refined form of matter.

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Smoke

Fog

Light

Electron

Application of wave like nature of particle is

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Photodiode

Optical microscope

Electron microscope

Compound microscope

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Physics FSC Part 2 Chapter 19 Online MCQ's Test MCQs With Answers

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