Prelims Daily MCQs - Geography (13 April)

1. Choose correct matches:

  1. Kerala – Thorium
  2. Jammu & Kashmir – Lithium
  3. Tamil Nadu - Lignite

a) 1 and 2 only

b) 2 and 3 only

c) 1 and 3 only

d) 1, 2 and 3

Ans: d

Exp: Thorium is found in Monazite sand of Kerala. Lithium is recently discovered in J&K. Lignite is found in Neyveli in Tamil Nadu. Hence, all statements are correctly matched

2.  Consider following statements regarding Polar Vortex.

  1. It is an area of high pressure and low temperature formed at both the poles.
  2. It is located in the upper atmospheric region.
  3. It leads to magnification of ozone hole near poles.

Choose correct statements.

a) 1 and 2 only

b) 2 and 3 only

c) 1 and 3 only

d) 1, 2 and 3

Ans: b

Exp: Polar Vortex is formed near poles in conditions of low pressure and low temperature. It is formed away from the surface in upper atmosphere. It provide stable conditions for chlorine and bromine to react with Ozone which leads to depletion of ozone layer. Hence b is correct.

3.  With reference to the structure of the atmosphere, consider the following statement.

  1. The warmer the weather the thicker is the troposphere.
  2. There are marked seasonal temperature changes in the stratosphere.
  3. The Kennelly Heaviside layer present within the ionosphere reflects the medium radio waves.
  4. The International Space Station is situated in the thermosphere.

Select the correct answer from the codes given below:

a) 1, 2 and 3 only

b) 1 and 2 only

c) 4 only

d) All of the above

Ans: d

Exp: Statement 1 is correct: The height of the troposphere at the poles is about 8 km, while at the equator it is about 16 km. This is because there is greater heating at the equator. Its thickness tends to vary seasonally. Heat differential on the planet’s surface causes convection currents to flow from the equator to the poles.

Statement 2 is correct: Stratosphere is characterised by very cold, cloudless, with extremely thin air and without dust, smoke or water vapour and marked seasonal temperature changes. Temperature in the stratosphere rises with increasing altitude, because the ozone layer absorbs the greater part of the solar ultraviolet radiation. The more ozone in a given parcel of air, the more heat it retains. Ozone concentration varies with changing seasons, an important feature of seasonal ozone changes is the natural chemical destruction that occurs when daylight is continuous in the summer polar stratosphere, which causes total ozone to decrease gradually towards its lowest values in early fall.

Statement 3 is correct: There are two important layers in the ionosphere viz. E layer or Kennelly Heaviside layer that reflects the medium radio waves, thus helping in short distance radio communication and F layer or Appleton layer that reflects the short radio waves and helps in long distance radio communication.

Statement 4 is correct: Thermosphere is much thicker than the inner layers of the atmosphere, but not nearly as thick as the exosphere. The thermosphere is home to the International Space Station as it orbits the earth. The low earth orbit satellites are also found in this layer.

4. Match the following

Mountain Pass  Location

A. Bom Di La   1. Uttarakhand

B. Lipu Lekh   2. Arunachal Pradesh

C. Rohtang Pass  3. Myanmar

D. Diphu Pass  4. Himachal Pradesh

Select the correct answer from the choices given below

a) A-3, B-1, C-4, D-2

b) A-2, B-3, C-4, D-1

c) A-4, B-2, C-3, D-1

d) A-2, B-1, C-4, D-3

Ans: d


Bom Di La- Arunachal Pradesh

Lipu Lekh- Uttarakhand

Rohtang Pass- Himachal Pradesh

Diphu Pass- Myanmar

5. This Lake of Arunachal Pradesh was formed due to an Earthquake.  It is deeply revered by Buddhists in India. It is also known as Madhuri Lake after the name of the actress who came here for a film shoot.

a) Sangetsar Lake

b) Mehao Lake

c) Sela Lake

d) Penga Teng Tso Lake

Ans: a

Exp: Known for its spell-bounding beauty, this lake was formed in 1973 after an Earthquake hit this area. Bollywood actress Madhuri Dixit shot a song for film Koyla here, post this, the Lake came to be called Madhuri Lake.

6. 7 spiders can make 49 webs in 7 days. Then 1 spider can make 1 web in how many days?

a) 1/7 Day

b) 1 Day

c) 7 Days

d) 49 Days

Ans: b

Exp: 7 spiders in 7 days make 49 webs i.e.

49 spider days are required for 49 webs i.e.

1 spider day is required for 1 web.

So, 1 spider makes 1 web in 1 day.

7. The average weight of A, B and C is 45 kg. If the average weight of A and B be 40 kg and that of B and C be 43 kg, then the weight of B is:

a) 21

b) 25

c) 30

d) 31

Ans: d


Let A, B, C represent their respective weights. Then, we have:

A + B + C = (45 x 3) = 135 .... (i)

A + B = (40 x 2) = 80 .... (ii)

B + C = (43 x 2) = 86 ....(iii)

Adding (ii) and (iii), we get: A + 2B + C = 166 .... (iv)

Subtracting (i) from (iv), we get : B = 31.

B's weight = 31 kg.

Cover the entire CSAT syllabus in 70 hours.

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