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Orbitals having two spherical nodes are: 

The correct order of the total number of nodes of atomic orbitals is: 
1.  4f > 6s > 5d
2.  6s > 5d > 4f
3.  4f > 5d > 6s
4.  5d > 4f > 6s

If uncertainty in the position of an electron is zero the uncertainty in its momentum will be: 
1. <h/4$\mathrm{\pi }$
2. >h/4$\mathrm{\pi }$
3. zero
4. infinite

There are three energy levels in an atom. How many spectral lines are possible in its emission spectra?
1. One
2. Two
3. Three
4. Four

The splitting of spectral lines in a magnetic field, arising out of the orbital motion of electrons only and the further splitting due to spin motion are respectively called
1. Zeeman and Stark effects
2. Zeeman and anomalous Zeeman effects
3. Stark and Zeeman effects
4. Zeeman and Kerr effects

The ratio of the wavelengths of the last lines of the Balmer and Lyman series is-
1. 4:1
2. 27:5
3. 3:1
4. 9:4

The energy of an electron in the first Bohr's orbit of an H-atom is -13.6 eV. The possible energy value (s) of the excited state(s) for electrons in Bohr's orbits of hydrogen is (are):
1. -3.4 eV
2. -4.2 eV
3. -6.8 eV
4. +6.8 eV

A dye absorbs a photon of wavelength $\mathrm{\lambda }$ and re-emits the same energy into two photons of wavelengths ${\mathrm{\lambda }}_1$ $$ and ${\mathrm{\lambda }}_2$ respectively. The wavelength $\mathrm{\lambda }$ is related to ${\mathrm{\lambda }}_1$ and ${\mathrm{\lambda }}_2$ as-
1.  $\mathrm{\lambda }=\frac{{\mathrm{\lambda }}_1+{\mathrm{\lambda }}_2}{{\mathrm{\lambda }}_1{\mathrm{\lambda }}_2}$
2.  $\mathrm{\lambda }=\frac{{\mathrm{\lambda }}_1{\mathrm{\lambda }}_2}{{\mathrm{\lambda }}_1+{\mathrm{\lambda }}_2}$
3.  $\mathrm{\lambda }=\frac{{\mathrm{\lambda }}_1^2+{\mathrm{\lambda }}_2^2}{{\mathrm{\lambda }}_1+{\mathrm{\lambda }}_2}$
4.  $\mathrm{\lambda }=\frac{{\mathrm{\lambda }}_1{\mathrm{\lambda }}_2}{{\left({\mathrm{\lambda }}_1+{\mathrm{\lambda }}_2\right)}^2}$

The ratio of slopes of ${\mathrm{K}}_{\max } \mathrm{vs}. \mathrm{v} \mathrm{and} {\mathrm{V}}_0 \mathrm{vs}. \mathrm{v}$ curves in photoelectric effect gives -
(v=frequency, ${\mathrm{K}}_{\max }$=maximum kinetic energy, ${\mathrm{V}}_0$ stopping potential):
1.  Charge of electron
2.  Planck's constant
3.  Work function
4.  The ratio of Planck's constant of electronic charge

In Bohr's model of the hydrogen atom the ratio between the period of revolution of an electron in the orbit n=1 to the period of revolution of the electron in the orbit n=2 is
1. 1:2
2. 2:1
3. 1:4
4. 1:8

If the speed of electron in Bohr's first orbit of hydrogen atom be x, then speed of the electron in 3rd orbit is:
1. x/9
2. x/3
3. 3x
4. 9x

The maximum wavelength in the Lyman series of He⁺ ion is-
1. 3R
2. 1/3R
3. 1/R
4. 2R

The transition of electrons in H atom that will emit maximum energy is:
1. n₃ $\to$ n₂
2. n₄ $\to$ n₃
3. n₅ $\to$ n₄
4. n₆ $\to$ n₅