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

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

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

Application of wave like nature of particle is

• Photodiode A
• Optical microscope B
• Electron microscope C
• Compound microscope D

The dimensions of Plank's constant is same as that of.

• Energy A
• Power B
• Acceleration C
• Angular momentum D

If the energy of photon is 10 eV and work function is 5 eV, then the a value of stopping potential will be

• 50 V A
• 2 V B
• 5 V C
• 15 V D

Who explained the photo electric effect.

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

Which is the most refined form of matter.

• Smoke A
• Fog B
• Light C
• Electron D

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

Wave nature of particle was given by:

• Clemensen A
• Louis de Broglie B
• Laster H. Germer C
• Clinton S. Davisson 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

Albert Einstein got noble prize for service in:

• Pair production A
• Annihilation of matter theory B
• Compton effect C
• Photoelectric effect 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 unit of Plank's constant 'h' is.

• JC A
• J/C B
• JS C
• J/S 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

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 existence of positron in 1928 was predicted by

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

The special theory of relativity based on.

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

The energy of photon is givne by

• mv2/2 A
• hf B
• Va e C
• mac¹ D