The materials having negative magnetic susceptibility are

Choose the incorrect statements with respect to chordates
$(A)$ Presence of mid ventral, solid and double nerve cord.
$(B)$ Presence of open circulatory system.
$(C)$ Presence of ventral heart.
$(D)$ Presence of paired pharyngeal gills slits.
$(E)$ Triploblastic acoelomate animals.

The number of normals drawn to the parabola $y^2 = 4x$ from the point $(1, 0)$ is

The plates of a parallel plate capacitor are charged up to $200 \ V$. $A$ dielectric slab of thickness $4 \ mm$ is inserted between its plates. Then,to maintain the same potential difference between the plates of the capacitor,the distance between the plates is increased by $3.2 \ mm$. The dielectric constant of the dielectric slab is:

Wires $A$ and $B$ have resistivities $\rho_A$ and $\rho_B$,where $\rho_B = 2 \rho_A$,and have lengths $l_A$ and $l_B$. If the diameter of wire $B$ is twice that of $A$ and the two wires have the same resistance,then the ratio $\frac{l_B}{l_A}$ is:

Which of the following acids is a vitamin?