Which part of the cauliflower is used as a vegetable?

Which of the following is not correct regarding $Terylene$?

If $a$ and $b$ are unit vectors, then the vector $(a+b) \times (a \times b)$ is parallel to the vector

Two capacitors $C_1$ and $C_2$ in a circuit are joined as shown below. The potential of point $A$ is $V_1$ and that of $B$ is $V_2$. The potential of point $D$ will be

$A$ $1 ~N$ pendulum bob is held at an angle $\theta$ from the vertical by a $2 ~N$ horizontal force $F$ as shown in the figure. The tension in the string supporting the pendulum bob (in newton) is

Molten sodium chloride conducts electricity due to the presence of