Step 1: Minamata Disease Overview.
Minamata disease is a neurological syndrome caused by severe mercury (Hg) poisoning. It was first identified in Minamata Bay, Japan, where industrial discharge of mercury into the bay contaminated the local seafood, leading to widespread mercury poisoning among the population.
Step 2: Conclusion.
Minamata disease is caused by mercury (Hg) poisoning, which corresponds to option (4).
A weight of $500\,$N is held on a smooth plane inclined at $30^\circ$ to the horizontal by a force $P$ acting at $30^\circ$ to the inclined plane as shown. Then the value of force $P$ is:
A steel wire of $20$ mm diameter is bent into a circular shape of $10$ m radius. If modulus of elasticity of wire is $2\times10^{5}\ \text{N/mm}^2$, then the maximum bending stress induced in wire is: