Consider the following statements : 1. Jet streams occur in the Northern Hemisphere only. 2. Only some cyclones develop an eye. 3. The temperature inside the eye of a cyclone is nearly 10°C lesser than that of the surroundings. Which of the statements given above is/are correct ?
- A.1 only
- B.2 and 3 only
- C.2 only
- D.1 and 3 only
Correct answer
Explanation
The correct answer is C, 2 only. Only statement 2 is true. Statement 1 is wrong because jet streams, the narrow belts of very fast westerly winds near the top of the troposphere, blow in both hemispheres. Each hemisphere has a polar front jet and a subtropical jet; the subtropical westerly jet over north India affects the onset of the monsoon, and a tropical easterly jet forms over India in summer. Statement 2 is correct because only well-developed tropical cyclones form a clear eye; weak depressions, storms in their early stages and temperate cyclones usually have none. Statement 3 is wrong because the eye is warmer, not colder: air sinking in the eye is compressed and heated, so the eye can be about 10°C warmer than the surroundings at the same height. The eye is calm, with light winds and clear skies, surrounded by the eyewall of strongest winds and heaviest rain. Option A is wrong because statement 1 is false. Option B is wrong because statement 3 is false. Option D is wrong because both its statements are false. Exam tip: eye of a cyclone = calm, clear and warm core; jet streams blow in both hemispheres.
Practice Questions
View allWhich one of the following is applicable to collision-coalescence process of precipitation?
- A.Clouds which do not extend beyond the freezing level
- B.Clouds which extend beyond the freezing level
- C.All types of clouds
- D.Cirrocumulus cloud
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Collision-coalescence is the way rain forms in warm clouds, whose tops stay below the level where water freezes. In such clouds all droplets are liquid.
Read the full explanation →Identify the type of drainage pattern on the basis of the given characteristics :
1. It represents the most common pattern of streams and their tributaries
2. It occurs in areas of uniform rock type and regular slope
3. A map, or aerial photograph, shows a pattern like the veins on a leaf— smaller streams join the main stream at an acute angle
Select the correct answer.
- A.Dendritic
- B.Radial
- C.Trellis
- D.Centripetal
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A pattern that looks like the branches of a tree or the veins of a leaf, formed on uniform rock with a regular slope, is dendritic.
Read the full explanation →The Research Design and Standards Organization is the R&D wing of which one of the following organizations ?
- A.Bhabha Atomic Research Centre
- B.Indian Space Research Organization
- C.Indian Railways
- D.Defence Research and Development Organization
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The Research Design and Standards Organisation (RDSO) is the sole research and development wing of the Ministry of Railways. RDSO is headquartered at Lucknow.
Read the full explanation →Which one of the following Indian States has recorded negative growth population as per Census 2011?
- A.Manipur
- B.Mizoram
- C.Tripura
- D.Nagaland
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Nagaland was the only Indian state whose population fell between 2001 and 2011; its decadal growth rate in Census 2011 was about −0.6 per cent.
Read the full explanation →Piecing together the puzzle of geologic time to create and analyze historical maps of the Earth is known as
- A.paleoclimatology
- B.paleogeomorphology
- C.paleolithology
- D.paleogeography
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Paleogeography is the study of the Earth's geography in the geological past, and its main product is a set of maps showing where continents, oceans, mountains and shorelines lay at different times.
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