A) Jet streams are strong winds with normal speed of 100 to 300 km/hr
B) Discovery of the Jet Streams was made by American airplanes during the World War I
C) Jet streams shift pole wards during summer and equator wards during winter season.
D) Velocity of the Jet stream in winter is almost twice the velocity the summer.
Correct Answer: B
Solution :
Jet streams were discovered by the American bomber airplanes over Japan during World War II. They found themselves stationary above their target while their speed indicators recorded 400 kmph (250 miles per hour) over 7-10 km heights. But when these bomber planes flew in the direction of the wind, their ground speed was doubled. Hence, meteorologists concluded that there is a narrow band of strong winds blowing at high speed in the upper troposphere. The term jet stream, used earlier for certain ocean current systems, was introduced in 1944 and soon became widely adopted for strong air winds from west to east at the level of tropopause.??????????? ??????????????????????????????
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