Question 1 : By charging the metal electrodes and gas inside the cathode ray tube :

Question 2 : The mass of proton is_____  times the mass of an electron.

Question 3 : Goldstein's work with canal rays was apparently the first observation of the:

Question 6 : Compared to the mass of lightest nucleus the mass of an electron is only:<br>

Question 8 : Which of the&nbsp;following is true for mass and charge of electron?

Question 9 : It was known by 1900 that&#160;the atom was not a............. , ................particle but contained at&#160;least one sub-atomic particle the electron identified by&#160;J.J. Thomson.&#160;

Question 10 : If an atom contains one electron and one proton, what charge will it carry?&nbsp;

Question 13 : The definitive experiments with cathode-ray tubes were done by ______ in 1879.

Question 14 : In which of the following transformations, the $\beta $-particles are emitted?

Question 16 : By changing the metal electrodes and gas inside the cathode ray tube,

Question 18 : Cathode rays are produced when high voltage is applied across a gas under:

Question 22 : In _________, J.J. Thomson discovered the electron, the first subatomic particle.

Question 28 : The cathode rays tube experiments carried out by J.J. Thomson demonstrated that :

Question 30 : Proton is formed by the loss of electron from which atom/ion?

Question 32 : An atom of silicon has a mass number of $29$. How many neutrons does it have?&#160;&#160;

Question 36 : ___________ said that cathode rays consist of negatively charged particles and these were named as electrons.

Question 38 : Which of the&nbsp;following is true for mass and charge of proton?

Question 46 : Who said that cathode rays consist of negatively charged particles ?

Question 49 : Which one of the following statements regarding cathode rays is not correct ?<span><br></span>

Question 50 : In $\beta$-emission from a radioactive substance, an electron is ejected from:

Question 54 : According to J.J Thomson's atomic model, negative charges are embedded in:

Question 58 : The increasing order of a specific charge to mass ratio of electron$(e)$, proton$(p)$, alpha particle$(\alpha)$ and neutron$(n)$ is:<br/>

Question 62 : An oil drop has $6.39 \times 10^{-19}\ C$ charge. What&#160;will be the number of electrons in this drop?

Question 64 : Which of the following was the instrument used for the discovery of the electron?

Question 69 : Goldsteins experiments which involved passing high voltage electricity through gases at very low pressure&nbsp;resulted in the discovery of:

Question 72 : Oxygen consists of isotopes&nbsp;${{\text{O}}^{16}}\,$,${{\text{O}}^{17}}\,$ and&nbsp;${{\text{O}}^{18}}\,$ carbon consists of isotopes of&nbsp;${{\text{C}}^{{\text{12}}}}$ and&nbsp;${{\text{C}}^{{\text{13}}}}$&nbsp;Total number of&nbsp;${\text{C}}{{\text{O}}_2}$ molecules possible are

Question 73 : Tick the appropriate answer.<br>Which of the following is used as a coolant in nuclear reactor ?

Question 79 : During the transformation of $_{ c }^{ a }{ X }$ to $_{ d }^{ b }{ Y }$, the number of $\beta $-particles emitted are

Question 80 : The e/m value of electron is measured for the certain mass of electrons whose minimum value is:

Question 82 : Which experiment is responsible for finding out the charge on an electron?

Question 84 : Which of the following is correct about the electron sea model?

Question 85 : How much coulomb charge is present on $1 \,g$ ion of $N^{3-}$?

Question 87 : Tick the appropriate answer.<br/>In $1908,$ R A Millikan found the charge of an electron to be

Question 88 : The $\displaystyle \frac {e}{m}$ ratio of an electron for all types of&#160;<span>substances is</span><span>&#160;:</span>

Question 91 : Which of the following statement is not correct regarding cathode rays?

Question 92 : In the path of the cathode rays, a tungsten metal is placed in the way. Then the rays produced are:

Question 96 : Which of the following statements is not correct about the characteristics of cathode rays?

Question 98 : If the mass of electron is doubled, the speed of electron revolving around $Li^{2+}$ nucleus will ________

Question 99 : A beam of some kind of particle of velocity $2\times {10}^{7}m/s$ is scattered by a gold $(z=79)$ foil. Find specific charge of this particle (charge/mass) if the distance of closest approach is $7.9\times {10}^{-14}m$.

Question 101 : The oil drop experiment by R.A. Mulliken was performed to find :

Question 102 : The value of effective charge on each oxygen atom is $-\frac{1}{4}$ in:

Question 103 : In an oil drop experiment, the following charges (in arbitary units) were found on a series of oil droplets:<br/>2.30 $\times$ 10$^{-15}$, 6.90 $\times$ 10$^{-15}$, 1.38 $\times$ 10$^{-14}$<br/>5.75 $\times$ 10$^{-15}$, 3.45 $\times$ 10$^{-15}$, 1.96 $\times$ 10$^{-14}$<br/>The magnitude of charge on the electron (in the same unit) is:

Question 104 : Which of the following has negative charge and pairs with opposite spin?

Question 105 : The values of charge on the oil droplets experimentally observed were $-1.6\times 10^{-19}, -2.4\times&#160; 10^{-19}$ and $-4\times&#160; 10^{-19}$ coulomb. The value of the electronic charge, indicated by these results is

Question 106 : Among the following, the correct statement about cathode ray discharge tube is:&#160;

Question 107 : Rank the 4p, 4d and 4f orbitals of increasing order in which the electrons present tn them are shielded by inner electrons&nbsp;

Question 110 : Which of the following is false in case of an electron?

Question 111 : The increasing order (lowest first) for the values of e/m (charge/mass) for

Question 114 : The potential difference between cathode and anode in a cathode ray tube is $V$. The speed acquired by the electrons is proportional to