Geography Previous Questions from PSC, UPSC and SSC

  •  In India, in which one of the following types of forests is teak a dominant tree species?

  • Asked : UPSC Civil Services (Preliminary) 2015
  • ATropical moist deciduous forest
  • BTropical rain forest
  • CTropical thorn scrub forest
  • DTemperate forest with grasslands
  • Explanation:

    Tropical moist decidous forests are found in areas of moderate rainfall of 100 to 200 cm per annum, mean annual temperature of about 27°C and the average annual relative humidity of 60 to 75 per cent. The trees of these forests drop their leaves for about 6-8 weeks during the spring and early summer when sufficient moisture for the leaves is not available.

    Teak trees are the most dominant species of trees found in these forests.Bamboos, sal, shisham, sandalwood, khair, kusum, arjun, mulberry are some of the other commercially important species found here

  •  Consider the following States :
    1. Arunachal Pradesh
    2. Himachal Pradesh
    3. Mizoram
    In which of the above States do ‘Tropical Wet Evergreen Forests’ occur?

  • Asked : UPSC Civil Services (Preliminary) 2015
  • AI only
  • B2 and 3 only
  • C1 and 3 only
  • D1, 2 and 3
  • Explanation:

    Tropical Wet Evergreen Forests are typical rain forests which grow in those areas where the annual rainfall exceeds 250 cm, the annual temperature is about 25°-27°C the average annual humidity exceeds 77 per cent and the dry season is distinctly short.

    The true evergreen forests are found along the western side of the Western Ghats (between 500 to 1370 metres above sea level) south of Mumbai, in a strip running from north-east to south-west direction across Arunachal Pradesh, Upper Assam, Nagaland, Manipur, Mizoram and Tripura upto a height of 1070 metres and in the Andaman and Nicobar Islands.

    So, they are not found in Himachal Pradesh.

  •  Tides occur in the oceans and seas due to which among the following?
    I. Gravitational force of the Sun
    2. Gravitational force of the Moon
    3. Centrifugal force of the Earth
    Select the correct answer using the code given below.

  • Asked : UPSC Civil Services (Preliminary) 2015
  • AI only
  • B2 and 3 only
  • CI and 3 only
  • D1, 2 and 3
  • Explanation:

    The tide-raising forces at the earth’s surface thus result from a combination of basic forces: (1) the force of gravitation exerted by the moon (and sun) upon the earth; and (2) centrifugal forces produced by the revolutions of the earth and moon (and earth and sun) around their common center-of-gravity (mass) or barycenter.

    With the Earth-Moon system, gravity is like a rope that pulls or keeps the two bodies together, and centrifugal force is what keeps them apart. Because the centrifugal force is greater than the Moon’s gravitational pull, ocean water on the opposite side of the Earth bulges outward.

    The Sun’s gravity pulls ocean water toward the Sun, but at the same time, the centrifugal force of the combined Earth-Sun revolution causes water on the opposite side of Earth to bulge away from the Sun. However, the effect is smaller than the Moon, even given the greater mass of the Sun (greater mass means greater gravitational force). Why? Simply because The Sun is so far away — over 380 times farther away from the Earth than the Moon.

  •  What explains the eastward flow of the equatorial counter-current?

  • Asked : UPSC Civil Services (Preliminary) 2015
  • AThe Earth’s rotation on its axis
  • BConvergence of the two equatorial currents
  • CDifference in salinity of water
  • DOccurrence of the belt of calm near the equator
  • Explanation:

    There are two equatorial current flowing from east to west – the North EC and South EC. In between the two, there flows a equatorial counter current in the opposite direction, i.e from west to east. Now, it is said that piling up of waters in the area near Brazil, due to convergence of the two equatorial currents give rise to the equatorial counter current. This is because in this area due to convergence, the water is raised.

  • In the South Atlantic and South-Eastern Pacific regions in tropical latitudes, cyclone does not originate. What is the reason?

  • Asked : UPSC Civil Services (Preliminary) 2015
  • ASea surface temperatures are low
  • BInter-Tropical Convergence Zone seldom occurs
  • CCoriolis force is too weak
  • DAbsence of land in those regions
  • Explanation:

    The most proximate reasons for the lack of cyclone formation in the South Atlantic are sea surface temperatures that tend to run a shade cooler than ideal for tropical cyclone formation even in the southern summer, climatologically high values of vertical wind shear across that basin throughout the year, and a lack of pre-existing centers of rotation (vorticity) in that area.

    This last point is due both to the absence of tropical waves similar to those generated over west Africa in the northern hemisphere and to the fact the the Intertropical Convergence Zone (ITZC), which shifts toward the north in our summer and toward the south in the southern summer, usually stays at or north of the equator.

    Though many people might speculate that the sea surface temperatures are too cold, the primary reasons that the South Atlantic Ocean gets few tropical cyclones are that the tropospheric (near surface to 200mb) vertical wind shear is much too strong and there is typically no inter-tropical convergence zone (ITCZ) over the ocean. Without an ITCZ to provide synoptic vorticity and convergence (i.e. large scale spin and thunderstorm activity) as well as having strong wind shear, it becomes very difficult to nearly impossible to have genesis of tropical cyclones.

    So, ITCZ stays at or near the equator and does not shift southward over the south Atlantic or south Pacific region. Therefore, these regions do not have the ITCZ over them which is a major cause of lack of cyclone. While lower sea temperatures is also a cause, absence of ITCZ is the major cause, so the correct answer is b.

Geography Previous Question Answers PSC, UPSC, SSC, IBPS
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