$\left\{x \in R: \frac{2x-1}{x^3+4x^2+3x} \in R\right\}$ equals

Select the incorrect statement.

$A$ vibration magnetometer consists of two identical bar magnets placed one over the other such that they are perpendicular and bisect each other. The time period of oscillation in a horizontal magnetic field is $2^{5/4} \ s$. One of the magnets is removed and if the other magnet oscillates in the same field,then the time period in seconds is:

$A$ ball $A$ of mass $m$ moving along the positive $x$-direction with kinetic energy $K$ and momentum $p$ undergoes an elastic head-on collision with a stationary ball $B$ of mass $M$. After the collision,ball $A$ moves along the negative $x$-direction with kinetic energy $K/9$. The final momentum of ball $B$ is:

In an unbiased $p-n$ junction,holes diffuse from the $p-$region to $n-$region because

$\int \frac{\log \sqrt{x}}{3 x} dx$ is equal to