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

In Compton effect the photon behaves as a.

• Wave A
• Particle B
• Nucleon C
• Both a and b D

The number of electrons emitted depends upon

• Colour of target surface A
• Shape of surface B
• Frequency of incident light C
• Intensity of incident light D

A positron is an anti particle of.

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

Joule second is the unit of.

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

The photon with energy greater than 1.02 MeV can interact with matter as.

• Photoelectric effect A
• Compton effect B
• Pair production C
• annihilation of matter 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

The mass of an object will be doubled at speed.

• 2.6 x 10⁸ m/s A
• 1.6 x 10⁸ m/s B
• 2.6 x 10⁷ m/s C
• 3.6 x 10⁷ m/s D

Pair production can take place only when energy of radiation is equal and greater than 1.02 MeV, thus correct option is.

• X rays A
• Gama rays B
• Heat Radiation C
• Ultraviolet rays D

Max planck received noble prize in:

• 1927 A
• 1932 B
• 1918 C
• 1914 D

In 1905, the special theory of relativity was proposed by

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

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

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

Anti particle of electron is

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