Which of the following units represents the largest amount of energy?

In the concentration of $PbS$ containing $ZnS$ as impurity,the depressant used is:

The pioneer country in the production of fuel-alcohol is

Where is the very rich museum located in Gujarat?

The first biosphere reserve established in India for conserving the gene pool of flora and fauna and the lifestyle of tribals is

Two wires are made of the same material and have the same volume. However,wire $1$ has cross-sectional area $A$ and wire $2$ has cross-sectional area $3A$. If the length of wire $1$ increases by $\Delta x$ on applying force $F$,how much force is needed to stretch wire $2$ by the same amount?