If you suspect a major deficiency of antibodies in a person,to which of the following would you look for confirmatory evidence?

What is the $Norin-10$ gene?

If two soap bubbles of different radii are connected by a tube, then

Crystalline sodium chloride is an insulator of electricity because $......$

Assign $A, B, C, D$ from the given type of reaction.
$4KCN + Fe(CN)_2 \downarrow \longrightarrow K_4[Fe(CN)_6]$

$A$ long straight wire carrying a current of $30 ~A$ is placed in an external uniform magnetic field of induction $4 \times 10^{-4} ~T$. The magnetic field is acting parallel to the direction of current. The magnitude of the resultant magnetic induction in tesla at a point $2.0 ~cm$ away from the wire is
$\left(\mu_0=4 \pi \times 10^{-7} ~H/m\right)$