Physics Modern Physics questions from NEET UG 2016.
Given the value of Rydberg constant is ${10}^{7} {m}^{-1}$, the wave number of the last line of the Balmer series in hydrogen spectrum will be:
The given circuit has two ideal diodes connected as shown in the figure below. The current flowing through the resistance ${R}_{1}$ will be 
Photons with energy of $5\mathrm{eV}$ are incident on a cathode, $C$ in a photoelectric cell. The maximum energy of emitted photoelectrons is $2 eV.$ When photons of energy $6eV$ are incident on $C$, no photoelectrons will reach the anode, $A$, if, the stopping potential of $A$ relative to $C$ is
If an electron in a hydrogen atom jumps from the third orbit to the second orbit, it emits a photon of wavelength $\lambda$. When it jumps from the fourth orbit to the third orbit, the corresponding wavelength of the photon will be
Consider the junction diode as ideal. The value of current flowing through AB is: 
When a metallic surface is illuminated with radiation of wavelength $\lambda$, the stopping potential is $V$. If the same surface is illuminated with radiation of wavelength $2\lambda$, the stopping potential is $\frac{V}{4}$. The threshold wavelength for the metallic surface is:
What is the output $Y$ in the following circuit, when, all the three inputs $A, B, C$ are first $0$ and then, $1$? 
To get output $1$ for the following circuit, the correct choice for the input is: 
The half-life of a radioactive substance is $30\mathrm{min}$. The time (in minutes) taken between $40%$ decay and $85%$ decay of the same radioactive substance is
When an $\alpha$ -particle of mass $m$ moving with a undefined velocity bombards on a heavy nucleus of charge $\mathrm{Ze}$, its distance of the closest approach from the nucleus depends on $m$ as:
Electrons of mass, $m$ with de-Broglie wavelength, $\lambda$ fall on the target in an X-ray tube. The cutoff wavelength, $({\lambda }_{0})$ of the emitted X-ray is
An electron of mass m and a photon have same energy $E.$ The ratio of de-Broglie wavelengths associated with them is: ($c$ being velocity of light)