Which one of the following is not a resultant of the El Nino effect ?
- A.Distortion of equatorial atmospheric circulation
- B.Flow of the South-East Trade Winds towards the Indian Ocean
- C.Irregularities in the evaporation of sea water
- D.Reduction in the amount of planktons which reduces the number of fish in the sea
Correct answer
Explanation
The correct answer is B, Flow of the South-East Trade Winds towards the Indian Ocean. During El Nino the trade winds of the Pacific weaken or even reverse, so a steady flow of these winds is not one of its results. El Nino is the periodic warming of the eastern equatorial Pacific off Peru and Ecuador, appearing every few years around Christmas, which is why fishermen named it after the Christ child. Warm water spreads east, the cold Humboldt current and its upwelling weaken, and the usual Walker circulation over the equator is disturbed. Option A is wrong because El Nino does distort the equatorial atmospheric circulation, shifting rainfall and pressure belts. Option C is wrong because the unusually warm surface water does cause irregular evaporation, bringing floods to some regions and drought to others. Option D is wrong because weaker upwelling brings fewer nutrients to the surface, so plankton and the fish that feed on them decline, hurting Peru's fisheries. Exam tip: El Nino = warm Pacific, weak trade winds, weak Indian monsoon tendency; La Nina = the cold opposite phase.
Practice Questions
View allInceptisols, Entisols, Vertisols and Mollisols are orders of which one of the following ?
- A.Sugarcane
- B.Soil
- C.Coal
- D.Copper
Show answer
These are four of the twelve soil orders in the USDA Soil Taxonomy, the classification also used by Indian soil scientists.
Read the full explanation →Arrange the following major elements present in the Earth's crust, in ascending order, in weight percentage :
1. Aluminium
2. Calcium
3. Silicon
4. Oxygen
Select the answer using the code given below :
- A.3, 4, 1, 2
- B.4, 3, 1, 2
- C.2, 1, 3, 4
- D.1, 2, 3, 4
Show answer
By weight, calcium is the smallest of the four and oxygen the largest, so the ascending order is calcium, aluminium, silicon, oxygen.
Read the full explanation →Which town stands on the water divide between the Indus and the Ganga river systems?
- A.Ambala
- B.Dehradun
- C.Haridwar
- D.Agra
Show answer
The divide between the two great northern systems does not run along a mountain here but across the almost flat plain of Haryana, and Ambala sits on it, so water falling a little to its west goes to the Ghaggar and the Indus side while water falling to its east…
Read the full explanation →The Tapi river originates near which place in Madhya Pradesh?
- A.Multai in Betul district
- B.Amarkantak in Anuppur district
- C.Janapav in Indore district
- D.Sihawa in Dhamtari district
Show answer
It is the second of the two large west flowing peninsular rivers and runs almost parallel to the Narmada, with the Satpura range between them.
Read the full explanation →The Narmada river rises from which of the following?
- A.Amarkantak plateau in Madhya Pradesh
- B.Trimbakeshwar in Maharashtra
- C.Mahabaleshwar in Maharashtra
- D.Brahmagiri range in Karnataka
Show answer
The correct answer is A, the Amarkantak plateau in Madhya Pradesh, where the Narmada rises at about one thousand metres and begins its westward journey of some thirteen hundred kilometres through Madhya Pradesh and Gujarat to the Gulf of Khambhat; on the way it makes the Dhuandhar falls and the…
Read the full explanation →