NEET 2018 Question Paper Mock Test

The magnetic potential energy stored in a certain inductor is $25\text{mJ}$, when the current in the inductor is $60\text{mA}$. This inductor is of inductance:

An electron falls from rest through a vertical distance $h$ in a uniform and vertically upward directed electric field $E$. The direction of electric field is now reversed, keeping its magnitude the same. A proton is allowed to fall from rest in it through the same vertical distance $h$. The time of fall of the electron, in comparison to the time of fall of the proton is:

The electrostatic force between the metal plates of an isolated parallel plate capacitor $C$ having a charge $Q$ and area $A$, is:

A tuning fork is used to produce resonance in a glass tube. The length of the air column in this tube can be adjusted by a variable piston. At room temperature of $27^{\circ }\text{C}$ two successive resonances are produced at $20\text{cm}$ and $73\text{cm}$ of column length. If the frequency of the tuning fork is $320\text{Hz}$, the velocity of sound in air at $27^{\circ }\text{C}$ is:

A pendulum is hung from the roof of a sufficiently high building and is moving freely to and fro like a simple harmonic oscillator. The acceleration of the bob of the pendulum is $20{\text{m/s}}^2$ at a distance of $5\text{m}$ from the mean position. The time period of oscillation is: