Two racing cars of masses $m_1$ and $m_2$ are moving in circles of radii $r_1$ and $r_2$ respectively. Their speeds are such that each makes a complete circle in the same time $t$. The ratio of the angular speeds of the first to the second car is

Which facilities have made poultry farming a popular business?

$A$ steel meter scale is to be ruled so that millimeter intervals are accurate within about $5 \times 10^{-5} \ mm$ at a certain temperature. The maximum temperature variation allowable during the ruling is .......... $^oC$ (Coefficient of linear expansion of steel $\alpha = 10 \times 10^{-6} \ K^{-1}$)

Aluminium is extracted from alumina $(Al_2O_3)$ by electrolysis of a molten mixture of:

The joint equation of the lines passing through the origin and trisecting the first quadrant is . . . . . .

Benzene can react with