The most plausible explanation for the location of the Thar desert in western India is
Options: the obstruction caused by the Aravalis to the rain-bearing wind that proceeds to the Ganga Valley, the evaporation of moisture by heat, the absence of mountains to the north of Rajasthan to cause orographic rainfall in it, that the moisture carried by the South-west monsoon is driven away by the dry upper air current
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
Options: cool, extremely dry wind that forms over the Sahara and blows westward or south-westward to the African coast, wind that blows during the dry season from December to February, tertiary wind that carry great quantities of fine dust from the Sahara, All of the above
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