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

Antiparticle of electron is.

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

In Compton scatting, the value of shift is equal to Compton's wavelength, when X-rays is scattered at the angle of.

• 90^oC A
• Zero B
• 120^oC C
• 45^oC D

The converses of annihilation of matter is:

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

The numerical value of Compton wavelength is equal to

• 3.43 x 10^-12 m A
• 1.43 x 10^-12m B
• 2.43 x 10^-12m C
• 0.43 x 10^-12m 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

Albert Einstein got noble prize for service in:

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

The Compton effect is associated with

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

Joule second is the unit of.

• Energy A
• Wein's constant B
• Planck's constant C
• Boyle's law D

Platinum wire becomes yellow at a temperature of.

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

Wave nature of light appears in

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

Which is the most refined form of matter.

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

The photoelectric effect predicts that light is made of

• Photons A
• Neutrons B
• Protons C
• None of these D

The unit of work function is

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