Daily Static MCQs for UPSC & State PSC Exams - Geography (18 October 2023)

Daily Static MCQs Quiz for UPSC, IAS, UPPSC/UPPCS, MPPSC. BPSC, RPSC & All State PSC Exams

Subject : Geography

1. Consider the following statements regarding Sea floor:

1. Volcanic eruptions are common along the mid-oceanic ridges.
2. The age of the rocks decreases as one moves away from the crest.
3. The ocean crust rocks are much younger than the continental rocks.

How many of the above statements is/are correct?

(a) Only one
(b) Only two
(c) All three
(d) None

Answer: (B)

Explanation:

Sea floor spreading is verified using these phenomena:

  1. It was realised that all along the mid-oceanic ridges, volcanic eruptions are common and they bring huge amounts of lava to the surface in this area. The sediments on the ocean floor are unexpectedly very thin.
  2. The age of the rocks increases as one moves away from the crest.
  3. The ocean crust rocks are much younger than the continental rocks.
  4. The sediments on the ocean floor are unexpectedly very thin.
  5. The deep trenches have deep-seated earthquake occurrences while in the mid-oceanic ridge areas, the quake foci have shallow depths.

Hence, statement 2 is incorrect.

2. Which of the following are the conditions for the emergence of a tropical cyclone?

1. Unstable condition through the Troposphere
2. Strong Coriolis force
3. Strong vertical wind
4. Large and continuous supply of warm and moist air.

Select the correct answer using the code given below:

(a) Only one
(b) Only two
(c) Only three
(d) All four

Answer: (C)

Explanation:

Some initial conditions for the emergence of a tropical cyclone are:

  1. Large and continuous supply of warm and moist air that can release enormous latent heat.
  2. Strong Coriolis force that can prevent filling of low pressure at the centre (absence of Coriolis force near the equator prohibits the formation of tropical cyclone between 0°-5° latitude).
  3. Unstable condition through the troposphere that creates local disturbances around which a cyclone develops.
  4. Finally, absence of strong vertical wind wedge, which disturbs the vertical transport of latent heat.

3. Consider the following statements:

1. Earth’s crust is the thinnest of all the major layers of earth.
2. The crust is thicker on the continent than on the ocean floor.
3. The oceanic crust mainly consists of manganese and iron.

How many of the above statement is/are incorrect?

(a) Only one
(b) Only two
(c) All three
(d) None

Answer: (A)

Explanation: The uppermost layer over the earth’s surface is called the crust. It is the thinnest of all the layers. It is about 35 km. on the continental masses and only 5 km on the ocean floors. The main mineral constituents of the continental mass are silica and alumina. It is thus called sial (si-silica and al-alumina). The oceanic crust mainly consists of silica and magnesium; it is therefore called sima (si-silica and ma-magnesium). Hence, statement 3 is not correct.

4. Hot Spots within the earth help produce Geothermal Energy. What are these ‘Hot Spots’?

(a) Areas of intense magnetic activity within the upper mantle
(b) Areas of intense pressure inside the mantle
(c) Regions of high volcanism on earth’s surface
(d) Region in crust where hot molten rocks are trapped

Answer: (D)

Explanation: Due to geological changes, molten rocks formed in the deeper hot regions of earth’s crust are pushed upward and trapped in certain regions called ‘hot spots’. When underground water comes in contact with the hot spot, steam is generated. Sometimes hot water from that region finds outlets at the surface. Such outlets are known as hot springs. Hence, option (d) is correct.

5. Consider the following statements:

1. Tur is a long-duration crop and requires more irrigation than cotton crop.
2. Tur has deep taproot system that allows the plant to draw moisture from the soil better than cotton.

Which of the above statements is/are correct?

(a) 1 only
(b) 2 only
(c) Both 1 and 2
(d) Neither 1 nor 2

Answer: (B)

Explanation: Given its long duration and being a relatively water-intensive crop, cotton needs a minimum of 5-6 irrigations, especially during the flowering, bud and boll formation stages. “Tur is also a long-duration crop, but doesn’t need more than 2-3 irrigations. The crop’s deep taproot system allows its plants to draw moisture from the soil better than cotton. Hence, statement 1 is not correct.