In the following common emitter circuit,if $\beta = 100, V_{CE} = 7 \, V, V_{BE} = 0 \, V$ (negligible),and $R_C = 2 \, k\Omega$,then find $I_B$ in $mA$.

In a reaction,$A + B \rightleftharpoons C + D$,$40 \%$ of $B$ has reacted at equilibrium,when $1 \ mole$ of $A$ was heated with $1 \ mole$ of $B$ in a $10 \ L$ closed vessel. The value of $K_C$ is

Which nitrogenous base is present in $RNA$ but not in $DNA$?

The equilibrium constant for the given reaction is $100$.
$N_{2(g)} + 2 O_{2(g)} \rightleftharpoons 2 NO_{2(g)}$
What is the equilibrium constant for the reaction given below?
$NO_{2(g)} \rightleftharpoons \frac{1}{2} N_{2(g)} + O_{2(g)}$

Which of the following compounds lacks iron?

Match the following:

Column-$I$	Column-$II$
$1$. Pituitary gland	$p$. Trachea
$2$. Thyroid gland	$q$. Bony cavity (Sella tursica)
$3$. Thymus	$r$. Anterior part of kidney
$4$. Adrenal glands	$s$. Dorsal side of the heart and aorta