The cold junction of a thermocouple is maintained at $10\,^{\circ}C$. No thermo $e.m.f.$ is developed when the hot junction is maintained at $530\,^{\circ}C$. The neutral temperature is ................ $^{\circ}C$.

An ideal gas is expanding such that $PT^2 =$ constant. The coefficient of volume expansion of the gas is

During joint diastole,..........

When $X$ amperes of current is passed through molten $AlCl_3$ for $96.5 \ s$,$0.09 \ g$ of aluminium is deposited. What is the value of $X$?

What is the process of breeding crops to increase their levels of minerals,vitamins,and proteins called?