NEET 2017 Question Paper - Code B - Mock Test

A positive charge is moved from A to B in several regions of equipotentials. In all cases, the potential difference between A and B is the same ($10\text{V}$ to $40\text{V}$). Which statement is correct?

Suppose the charge of a proton and an electron differ slightly. One is $-e$, the other is $e+\Delta e$. If the net electrostatic force and gravitational force between two hydrogen atoms at distance $d$ is zero, then $\Delta e$ is of the order of: (Mass of hydrogen $m_h=1.67\times 10^{-27}\text{kg}$)

A physical quantity of the dimensions of length that can be formed out of $c$, $G$ and $\frac{e^2}{4\pi {\epsilon }_0}$ is:

Two Polaroids $P_1$ and $P_2$ are placed with their axis perpendicular. Unpolarised light $I_0$ is incident on $P_1$. A third polaroid $P_3$ is kept in between such that its axis makes $45^{\circ }$ with $P_1$. The intensity of transmitted light through $P_2$ is:

A particle executes linear SHM with an amplitude of $3\text{cm}$. When the particle is at $2\text{cm}$ from the mean position, the magnitude of its velocity is equal to that of its acceleration. Then its time period in seconds is: