Physics Modern Physics questions from JEE Main 2016.
The truth table given in fig. represents: <table class="pyq-table"><tbody><tr><td>A</td><td>B</td><td>Y</td></tr><tr><td>0</td><td>0</td><td>0</td></tr><tr><td>0</td><td>1</td><td>1</td></tr><tr><td>1</td><td>0</td><td>1</td></tr><tr><td>1</td><td>1</td><td>1</td></tr></tbody></table>
A photoelectric surface is illuminated successively by monochromatic light of wavelengths $\lambda and \frac{\lambda }{2}.$ If the maximum kinetic energy of the emitted photoelectrons in the second case is 3 times that in the first case, the work function of the surface is :
When photons of wavelength ${\lambda }_{1}$ are incident on an isolated sphere, the corresponding stopping potential is found to be $V$. When photons of wavelength ${\lambda }_{2}$ are used, the corresponding stopping potential was thrice that of the above value. If light of wavelength ${\lambda }_{3}$ is used then find the stopping potential for this case:
An electron in a hydrogen atom makes a transition from $n=2$ to $n=1$ and emits a photon. This photon strikes a doubly ionized lithium atom which was already in an excited state and completely removes the orbiting electron. The least quantum number for the excited state of the lithium-ion for the process is
A neutron moving with a speed 'v' makes a head on collision with a stationary hydrogen atom in ground state. The minimum kinetic energy of the neutron for which perfactly inelastic collision will take place is :
To get an output of $1$ from the circuit shown in the figure the input must be: 
If a, b, c, d are inputs to a gate and $x$ is its output, then, as per the following time graph, the gate is: 
A Zener diode with a breakdown voltage of $4V$ is connected in series with a resistance $R$ to a battery of emf $10V$. The maximum power dissipation rating for the Zener diode is $1W$. The value of $R$ to ensure maximum power dissipation across the diode is
The temperature dependence of resistance of $\mathrm{Cu}$ and undoped $\mathrm{Si}$ in the temperature range $300-400K$ is best described by
Radiation of wavelength $\lambda$ is incident on a photocell. The fastest emitted photoelectron has a speed $v$. If the wavelength is changed to $\frac{3\lambda }{4}$, the speed of the fastest emitted photoelectron will be
Identify the semiconductor devices whose characteristics are given below, in the order $(a), (b), (c), (d)$:  