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

Max planck received noble prize in:

• 1927 A
• 1932 B
• 1918 C
• 1914 D

The energy of photon is givne by

• mv2/2 A
• hf B
• Va e C
• mac¹ 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

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

Photodiode is used for wave nature of.

• Light A
• Thermal radiation B
• Radi waves C
• Sound waves D

The concept of direction is purely

• Relative A
• Absolute B
• Relative to the motion C
• None of these D

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

When platinum is it becomes orange at.

• 500^oC A
• 900^oC B
• 1100^oC C
• 1300^oC 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 position has charge which is in magnitude equal to the charge on

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

Anti particle of electron is

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

The special theory of relativity based on.

• One postulate A
• Two postulates B
• Three postulates C
• Four postulates D

Photo electrons are emitted y using visible light when the metal is.

• sodium A
• Copper B
• Nicked C
• Cobalt D

A positron is an anti particle of.

• Proton A
• Electron B
• Neutron C
• Photon 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

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

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