Physics FSC Part 2 Chapter 19 Online MCQ's Test

The principle regarding the dual nature of light was first discovered by

• Heisenberg A
• Compton B
• J.J.Thomson C
• De-Broglie D

The numerical value of Compton wavelength is equal to

• 3.43 x 10^-12 m A
• 1.43 x 10^-12m B
• 2.43 x 10^-12m C
• 0.43 x 10^-12m D

The minimum frequency needed to emit an electron form metal surface is called:

• Work function A
• Threshold frequency B
• Quanta frequency C
• All of above D

Pair production occurs only when energy of photon is at least equal in:

• 1.02keV A
• 1.02 eV B
• 1.02 MeV C
• 1.02 GeV D

Wave nature of light appears in

• Pair production A
• Compton effect B
• Photo electric C
• Interference D

The unit of Plank's constant 'h' is.

• JC A
• J/C B
• JS C
• J/S D

The most refined form of matter is:

• Smoke A
• Light B
• Ice C
• Fog D

The Compton effect is associated with

• X-rays A
• y-rays B
• Positive rays C
• ß-rays D

Earth orbital speed is.

• 10 km/s A
• 20 km/s B
• 30 km/s C
• 40 km/s D

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

• 500^oC A
• 900^oC B
• 1100^oC C
• 1300^oC D

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

• Mass A
• Charge B
• Energy C
• Momentum D

The position has charge which is in magnitude equal to the charge on

• Electron A
• Proton B
• β particle C
• All D

The number of electrons emitted depends upon

• Colour of target surface A
• Shape of surface B
• Frequency of incident light C
• Intensity of incident light D

• Wien's constant A
• Planck's constant B
• Davison constant C
• Lumber's constant D

A perfect absorber must also be perfect

• Cavity A
• Sources of radiation B
• Radiator C
• None of these D

The energy of the photon of wavelength 500 nm is.

• 3.10 eV A
• 2.49 eV B
• 1.77 eV C
• 1.52 eV D

The physical quantity related to photon, that does not change in Compton scattering is.

• Energy A
• Speed B
• Frequency C
• Wavelength D