Dual nature of matter-NEET/JEE/PH mock test-1

Leave a Comment / By Physiquate / June 23, 2024

Welcome to your Dual nature of matter-NEET/JEE/PH mock test-1

In the phenomenon of electric discharge through gases at low pressure, the coloured glow in the tube appears as a result of (2008)

collision between different electrons of the atoms of the gas

excitation of electrons in the atoms

collision between the atoms of the gas

collisions between the charged particle emitted from the cathode and the atoms of the gas

None

A beam of cathode rays is subjected to crossed electric $(E)$ and magnetic fields $(B).$ The fields pare adjusted such that the beam is not deflected. The specific charge of the cathode rays is given by (2010) (where V is the potential difference between cathod and anod)

${{\frac{B^{2}}{2VE^{2}}}}$

${{\frac{2VE^{2}}{B^{2}}}}$

${{\frac{E^{2}}{2VB^{2}}}}$

${{\frac{2VB^{2}}{E^{2}}}}$

None

In a discharge tube ionization of enclosed gas is produced due to collisions between (2006)

positive ions and neutral atoms/molecules

neutral gas atoms/molecules

negative electrons and neutral atoms/molecules

photons and neutral atoms/molecules.

None

J. Thompson's cathode-ray tube experiment demonstrated that (2003)