If $u(x, y)=y \log x+x \log y$, then $u_x u_y-u_x \log x-u_y \log y+\log x \log y$ is equal to :

If $\frac{d^2y}{dx^2} = 0$,then

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 kingdom includes unicellular or multicellular eukaryotic organisms?

Oxidation number of $P$ in $Mg_2P_2O_7$ is

Which mineral element is present in the structure of the amino acids cysteine and methionine?