Product $(B)$ is

If a set $A$ has $n$ elements,then the total number of subsets of $A$ is:

If the curves $y^2=6x$ and $9x^2+by^2=16$ intersect each other at right angles,the value of $b$ is

Choose the incorrect statement from the following:
$S1:$ The efficiency of a heat engine can be $1$,but the coefficient of performance of a refrigerator can never be infinity.
$S2:$ The first law of thermodynamics is basically the principle of conservation of energy.
$S3:$ The second law of thermodynamics does not allow several phenomena consistent with the first law.
$S4:$ $A$ process,whose only result is to transfer heat from a colder to a hotter object,is impossible.

Which part of the brain is involved in the loss of control when a person drinks alcohol?

The equations of the normals at the ends of the latus rectum of the parabola $y^2 = 4ax$ are given by