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
One day you wake with a sore throat and a runny nose. Your doctor takes a swab from your throat, sends it to a lab, and telephones you the next day to say that antibiotic will not help you get better. Which of the following is the most likely reason for the doctor's statement?
Options: Having waited a day, it is too late to take an antibiotic, You need an antiseptic, not an antibiotic, You need to be vaccinated instead of taking an antibiotic, You are infected by a virus
Olympic emblem is composed of five intertwined rings, each of a different colour, representing the five continents of the world as
Options: Blue ring - Europe; Yellow ring - Asia; Black ring - Africa; Red ring- America; Green ring - Oceania, Blue ring - Asia; Yellow ring - Europe; Black ring - Oceania; Red ring- Africa; Green ring - America, Blue ring - Europe; Yellow ring - Asia; Black ring - Africa; Red ring- Oceania; Green ring - America, Blue ring - Asia; Yellow ring - Europe; Black ring - Africa; Red ring- America; Green ring - Oceania