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

neutral gas atoms/molecules

negative electrons and neutral atoms/molecules

photons and neutral atoms/molecules.

positive ions and neutral atoms/molecules

None

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

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

excitation of electrons in the atoms

collision between the atoms of the gas

None

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

the e/m of electrons is much greater than the e/m of protons

cathode rays are streams of negatively charged ions

the e/m ratio of the cathode-ray particles changes when a different gas is placed in the discharge tube

all the mass of an atom is essentially in the nucleus

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)

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

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

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

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

None

Which of the following is not the property of cathode rays ?

it produces fluorescence

It does not deflect in electric field.

It produces heating effect.

It casts shadow.

None