Physics ICS Part 2 Chapter 19 Online MCQ's Test

Anti particle of electron is

• Proton A
• Photon B
• Neutron C
• Positron 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

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

The maximum kinetic energy of emitted photo electrons depends upon.

• The intensity of incident light A
• Frequency of the incident light B
• Metal surface C
• Both frequency of incident light and metal surface. D

Compton's effect is associated with

• gamma rays A
• Beta rays B
• X rays C
• Positive rays D

A perfect absorber must also be perfect

• Cavity A
• Sources of radiation B
• Radiator C
• None of these D

When platinum is it becomes orange at

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

When platinum is heated is become dull red at:

• 900°C A
• 500°C B
• 800°C C
• 1100°C D

The converses of annihilation of matter is:

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

The existence of positron was discovered in:

• 1929 A
• 1928 B
• 1931 C
• 1933 D

Einstein photoelectric equation is

• 
  A
• 
  B
• 
  C
• None of these D

Potassium Cathodes in photocell emit electrons for a light.

• Visible A
• Infra red B
• Ultra violet C
• X rays D

The unit for Plank's constant is:

• Js^-1 A
• Jm B
• Js  C
• Jm² D

The value of Stefan is constant is:

• 4.57 x 10^-8 m²k² A
• 5.67 x10^-8 wm^-2k^-4 B
• 6.67x 10^-11 wm²k⁴ C
• 7.45 x  10^-9 m² wk³ 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