Question 11 MarkThe value of scattering angle of alpha particle for maximum value of impact parameter is :Answer(A) - $90^{\circ}$View full question & answer→
Question 21 MarkThe value of excitation energy required to bring an electron to the first excited state in hydrogen atom is :Answer(B) - 10.2 EvView full question & answer→
Question 31 MarkRadius of first orbit of hydrogen atom is $0.53\ Å$, radius of fourth orbit will be :Answer(D) - $8.48 \ Å$View full question & answer→
Question 41 MarkAccording to Bohr's theory, if angular momentum of electron in excited hydrogen atom is $\left(\frac{2 h}{2 \pi}\right)$, then the energy will be :Answer(A) - $-3.4 eV$View full question & answer→
Question 51 MarkAccording to Bohr's Model, which is not possible energy value of emitted photon by hydrogen atom :Answer(B) - 11.1 EvView full question & answer→
Question 61 MarkIf ionisation energy of hydrogen atom in ground state is 13.6 eV , then ionisation energy of first excited state will be :Answer(D) - 3.4 EvView full question & answer→
Question 71 MarkAccording to classical theory, path of electron in Rutherford model :Answer(D) - Spinal curveView full question & answer→
Question 81 MarkIn Rutherford's $\alpha$-scattering experiment, if atomic number increases with thin metal foil then scattering angle is :Answer(c) - increasesView full question & answer→
Question 91 MarkIn H -atom the radius of electron's first orbit in A will be :Answer(A) - 0.529View full question & answer→
Question 101 MarkThe ratio of kinetic energy to total energy in Bohr's Model of $n$ quantum level of electron in hydrogen atom will be :Answer(B) - $- 1$View full question & answer→
Question 111 MarkTransition of electron is from energy level $n=4$ to $n=1$ in hydrogen atom. The maximum numbers of photon to be emitted will be :Answer(D) - 6View full question & answer→
Question 121 MarkThe energy of hydrogen atom is $E _n$ in $n^{\text {th }}$ orbit. Energy of single ionised helium atom will be :Answer(A) - $4 E _n$View full question & answer→
Question 131 MarkIf ionisation potential of hydrogen atom is 13.6 eV , then its energy at $n=3$ :Answer(B) - 1.51 eVView full question & answer→
Question 141 MarkThe kinetic energy of revolving electron in hydrogen of radius ' $r$ ' will be :Answer(A) - $\frac{e^2}{2 r}$View full question & answer→
Question 151 MarkThe value of emitted frequency is maximum, while transition of electron :Answer(C) - $n=2$ to $n=0$View full question & answer→
Question 161 MarkRelation between radius of Bohr's orbit ' $r$ ', integer ' $n$ ' and constant K :Answer(A) - $r=n^2 K$View full question & answer→
Question 171 MarkIonisation energy of 10 times ionised sodium atom will be :Answer(C) - $13.6 \times(11)^2 eV$View full question & answer→
Question 181 MarkIf radius of Bohr's first orbit is ' $r$ ' then radius of second orbit will be :Answer(D) - $4 r$View full question & answer→
Question 191 MarkEnergy of electron in excited hydrogen atom is -3.4 eV . According to Bohr's theory, its angular momentum will be :Answer(B) - $\frac{2 h}{2 \pi}$View full question & answer→
Question 201 MarkAccording to Bohr, only those states are stable, in which angular momentum of electron will be :Answer(A) - $\frac{n h}{2 \pi}$View full question & answer→
Question 211 MarkIn hydrogen atom, if transition of electron from third orbit to second orbit, then wavelength of emitted radiation will be :Answer(C) - $\frac{36}{5 R}$View full question & answer→
Question 221 MarkRelation between principal quantum number ' $n$ ' and radius $r_n$ of Bohr's orbit is :Answer(B) - $r_n \propto n^2$View full question & answer→
Question 231 MarkIn scattering experiment, $\alpha$-particles scattered due to which force :Answer(B) - Coulomb's forceView full question & answer→
Question 241 MarkThe total energy of electron in $n^{\text {th }}$ orbit, according to Bohr's theory :Answer(A) - $E _n=\frac{-13.6}{n^2} eV$View full question & answer→