The primitive prokaryotes responsible for the production of biogas from the dung of ruminant animals include the:

Secondary sewage treatment is mainly a

If $A$ is the areal velocity of a planet of mass $M$,its angular momentum is

The primary and secondary coils of a transformer have $50$ and $1500$ turns respectively. If the magnetic flux $\phi$ linked with the primary coil is given by $\phi = \phi_0 + 4t$,where $\phi$ is in webers,$t$ is time in seconds,and $\phi_0$ is a constant,the output voltage across the secondary coil is ...... $volts$.

Which of the following is a fossil plant?

Water is being poured at the rate of $36 \ m^3 / min$ into a cylindrical vessel,whose circular base has a radius of $3 \ m$. Then the water level in the cylinder is rising at the rate of: