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

Einstein photoelectric equation is

• 
  A
• 
  B
• 
  C
• None of these D

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

The Compton effect is associated with

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

The most refined form of matter is:

• Smoke A
• Light B
• Ice C
• Fog D

The stopping potential for a certain metal is 10 volts. Thus work function for the cathode is.

• 10 J A
• 1.6 X 10^-18 J B
• 1.6 X 10^-19 J C
• 1.6 X 10³⁰ J D

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

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

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

• Threshold energy A
• Threshold frequency B
• Work function C
• Work ability D

The converses of annihilation of matter is:

• Photoelectric effect A
• Relativistic effect B
• Pair production C
• Compton effect D

When the K.E. of photoelectric is zero, the frequency of incident photon is.

• Less than A
• greater than B
• Equal to C
• Much greater D

1 kg mass will be equivalent to energy.

• 9 x 10⁸ J A
• 9 X 10¹² J B
• 9 X 10¹⁶ J C
• 9 X 10¹⁹ J D

Who explained the photo electric effect.

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

When platinum is it becomes orange at.

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

Max planck received noble prize in:

• 1927 A
• 1932 B
• 1918 C
• 1914 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

unit of Plank's constant is same as that of.

• Acceleration A
• Angular momentum B
• Linear momentum C
• Entropy D

Energy of Black body radiation depends upon

• Nature of surface of body A
• Nature of material of body B
• Shape and size of body C
• Temperature of the body D

The materialization of energy take place in the process of.

• Photo electric effect A
• Compton Effect B
• Pair production C
• Annihilationof matter D