Consider the depicted hydrogen $( H )$ in the hydrocarbons given below. The most acidic hydrogen $( H )$ is

Which of the following national parks is the home of the famous musk deer or Hangul?

$A$ steady current flows in a long wire. It is bent into a circular loop of one turn and the magnetic field at the centre of the coil is $B$. If the same wire is bent into a circular loop of $n$ turns,the magnetic field at the centre of the coil is

Which one of the following statements is not correct?

The equation of the lines passing through the origin and having slopes $3$ and $-\frac{1}{3}$ is

The first operation involved in a Carnot cycle is