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

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

Max planck received noble prize in:

• 1927 A
• 1932 B
• 1918 C
• 1914 D

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

• Energy A
• Speed B
• Frequency C
• Wavelength 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

When platinum is it becomes orange at

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

Disintegration of photon on striking a nucleus into an electron and positron is known as.

• Annihilation of matter A
• Compton effect B
• Pair production C
• Photo electric effect 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

A block body is an ideal:

• Absorber A
• Radiator B
• Both a & b C
• None of above 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

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

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

The existence of positron was discovered in:

• 1929 A
• 1928 B
• 1931 C
• 1933 D

Albert Einstein got noble prize for service in:

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

Platinum wire becomes yellow at a temperature of.

• 900 ^oC A
• 1300^oC B
• 1600^oC C
• 500^oC D

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

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

Internal frame is a frame is which

• 1st law holds A
• 2nd law holds B
• 3rd law holds C
• Kelvin's law holds D

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

• Uncertainity Priciple A
• De-broglie Theory B
• Einstin Theory C
• Photo electric effect D