Radiocarbon is produced in the atmosphere as a result of
Options: collision between fast neutrons and nitrogen nuclei present in the atmosphere, action of ultraviolet light from the sun on atmospheric oxygen, action of solar radiations particularly cosmic rays on carbon dioxide present in the atmosphere, lightning discharge in atmosphere
The three recognized major fishing grounds of the world are located in the
Options: northern hemisphere only, southern hemisphere only, two in the southern hemisphere only and one in the northern hemisphere, one in the southern hemisphere only and two in the northern hemisphere
From the following, choose the set in which names of Secretary-Generals of the UNO are arranged in correct chronological order?
Options: U Thant, Kurt Waldheim, Dag Hammarskjoeld, Trygve Lie., Trygve Lie, Dag Hammarskjoeld, U Thant, Kurt Waldheim., Trygve Lie, U Thant , Dag Hammarskjoeld, Kurt Waldheim., U Thant, Dag Hammarskjoeld, Trygve Lie, Kurt Waldheim.
Options: they emit light of a constant intensity, their distance from the earth does not change with time, they are very far away from the earth resulting in decrease in intensity of light, they are nearer to earth and hence we receive a greater amount of light and, therefore minor variations in the intensity are not noticeable
The Latin word formica means ant. The name formic acid is derived from this Latin word because
Options: this acid, in ancient times, was used to eliminate ant-hills, this corrosive acid is secreted by ants to drive away their enemies, this acid was first obtained by the distillation of ants, ants are attracted by the odour of this acid