Which part of the human brain is concerned with the regulation of body temperature?

An ideal gas expands isothermally from volume $V_1$ to volume $V_2$. It is then compressed to the original volume $V_1$ adiabatically. If $p_1$ and $p_2$ represent the initial pressure and final pressure respectively,and $W$ represents the net work done by the gas during the entire process,then:

What is the primary objective of plant breeding?

If the direction cosines of two lines are given by $l+m+n=0$ and $l^2-5m^2+n^2=0$,then the angle between them is

$A$ weak acid $HX$ has the dissociation constant $1 \times 10^{-5} \text{ } M$. It forms a salt $NaX$ on reaction with alkali. The percentage hydrolysis of $0.1 \text{ } M$ solution of $NaX$ is ............... $\%$

Match the $\frac{C_P}{C_V}$ ratio for ideal gases with different types of molecules.

Molecule type	$\frac{C_P}{C_V}$
$A$. Monoatomic	$I$. $\frac{7}{5}$
$B$. Diatomic rigid molecules	$II$. $\frac{9}{7}$
$C$. Diatomic non-rigid molecules	$III$. $\frac{4}{3}$
$D$. Triatomic rigid molecules	$IV$. $\frac{5}{3}$