Question # 1

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 unit for Plank's constant is:

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Js^-1

Jm

Js

Jm²

We can never accurately describes all aspects of sbatomic particles simulatanously. It is correct according to:

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Uncertainity Priciple

De-broglie Theory

Einstin Theory

Photo electric effect

The converses of annihilation of matter is:

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Photoelectric effect

Relativistic effect

Pair production

Compton effect

Minimum energy needed to escape an electron ofrm metal surface is called:

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Threshold energy

Threshold frequency

Work function

Work ability

Earth orbital speed is.

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10 km/s

20 km/s

30 km/s

40 km/s

In an nihilation emitted photons moves in opposite directions to conserve.

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Mass

Charge

Energy

Momentum

When a very high energy modeules such as y radiation interact with matter, the phenomenon arising will be.

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Photoelectric effect

Compton effect

Pair production

Annihilation of matter

Wave nature of light appears in

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Pair production

Compton effect

Photo electric

Interference

The minimum energy required for occurrence of pair production is:

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1.022eV

1.02keV

1.02Me.V

1.04MeV

The energy of the photon of wavelength 500 nm is.

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3.10 eV

2.49 eV

1.77 eV

1.52 eV

The dimensions of Plank's constant is same as that of.

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Energy

Power

Acceleration

Angular momentum

Platinum wire becomes yellow at a temperature of.

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900^oC

1300^oC

1600^oC

500^oC

Photodiode is used for wave nature of.

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Light

Thermal radiation

Radi waves

Sound waves

The special theory of relativity based on.

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One postulate

Two postulates

Three postulates

Four postulates

A positron is an anti particle of.

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Proton

Electron

Neutron

Photon

When platinum wire is heated, it changes to cherry red at temperature.

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500^oC

900^oC

1100^oC

1300^oC

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

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Length

Time

Mass

Energy

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Physics Fsc Part 2 Chapter 8 Online Test MCQs With Answers

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