Which of the following is not a polymer?

If $200 \text{ MeV}$ of energy is released in the fission of one nucleus of ${}_{92}^{236}U$,the number of nuclei that must undergo fission to release an energy of $1000 \text{ J}$ is

There is a uniform electric field of strength $10^3 \ Vm^{-1}$ along the $Y$-axis. $A$ body of mass $1 \ g$ and charge $10^{-6} \ C$ is projected into the field from the origin along the positive $X$-axis with a velocity of $10 \ ms^{-1}$. Its speed in $ms^{-1}$ after $10 \ s$ is (Neglect gravitation).

The coefficient of $x^5$ in the expansion of $(1+x^2)^5(1+x)^4$ is:

The solution of $(1+x^2) \frac{dy}{dx} + 2xy - 4x^2 = 0$ is:

For a gas,the deviation from ideal behavior is maximum at: