Identify the plant shown in the given figure.

The wavelength of the first line of the Lyman series for a hydrogen atom is equal to that of the second line of the Balmer series for a hydrogen-like ion. The atomic number $Z$ of the hydrogen-like ion is

If the kinetic energy of a body is directly proportional to time $t$,the magnitude of force acting on the body is
$(i)$ directly proportional to $\sqrt{t}$
$(ii)$ inversely proportional to $\sqrt{t}$
$(iii)$ directly proportional to the speed of the body
$(iv)$ inversely proportional to the speed of the body

Which algae is rich in protein?

$A$ liquid does not wet the solid surface if the angle of contact is

If $y$ is a function of $x$ and $\log(x+y)=2xy$,then the value of $y'(0)$ is