Second Year Physics Chapter 19 Online MCQ Test for 2nd Year Physics Chapter 19 Dawn of Modern Physics Preparation

Compton's effect is associated with

• gamma rays A
• Beta rays B
• X rays C
• Positive rays D

A perfect absorber must also be perfect

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

Einstein was awarded Nobel prize in physics in

• 1905 A
• 1911 B
• 1918 C
• 1921 D

Albert Einstein got noble prize for service in:

• Pair production A
• Annihilation of matter theory B
• Compton effect C
• Photoelectric effect D

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

• 20 m A
• 50 m B
• 760 m C
• 780 m D

Light of 4.5 eV is incident on a Cesium surface and stopping potential is 0.25 eV, maximum K.E. of emitted electron is.

• 4.5 eV A
• 4.25 eV B
• 4.75 eV C
• 0.25 eV D

Wave nature of light appears in

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

In the equation if f₂ > then

• 
  A
• 
  B
• 
  C
• 
  D

The unit of work function is

• Electron volt A
• Ampere B
• Volt cell C
• Hz D

Unit of Stephen's constant is

• W m K^-2 A
• W m^-2 K^-4 B
• W m K^-4 C
• None D

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

A positron is an anti particle of.

• Proton A
• Electron B
• Neutron C
• Photon D

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

• Length A
• Time B
• Mass C
• All of above D

The existence of positron in 1928 was predicted by

• Anderson A
• Dirac B
• Chadwick C
• Plank D

Who explained the photo electric effect.

• Max Plank A
• Einstein B
• Henry C
• Rutherford 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

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