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

The unit of Plank's constant 'h' is.

• JC A
• J/C B
• JS C
• J/S D

The minimum energy required for occurrence of pair production is:

• 1.022eV A
• 1.02keV B
• 1.02Me.V C
• 1.04MeV D

Application of wave like nature of particle is

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

Which one of the following paved the way for modern physics

• Newtonian mechanics A
• Theory of relativity B
• Quantum theory C
• All of above D

When platinum is it becomes orange at.

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

In 1905, the special theory of relativity was proposed by

• Einstein A
• Bohr B
• Maxwell C
• De Broglie 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

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

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

A positron is an anti particle of.

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

Compton effect proves.

• Wave nature of radiation A
• Wave nature of particle B
• Dual nature of particle C
• Particle nature of radiations D

1 kg mass will be equivalent to energy.

• 9 x 10⁸ J A
• 9 X 10¹² J B
• 9 X 10¹⁶ J C
• 9 X 10¹⁹ J D

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

The quantity/factor h/m_oc has the dimensions of.

• Length A
• Time B
• Mass C
• Energy D

Which is the most refined form of matter.

• Smoke A
• Fog B
• Light C
• Electron 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

The concept of direction is purely

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