Skip to content
GK24
Prime
GeographyMediumAsked in: NDA · NDA-II 2019, GAT

In which one of the following folds is the axial plane found to be virtually horizontal ?

  1. A.Isoclinal
  2. B.Anticlinal
  3. C.Recumbent
  4. D.Monoclinal

Correct answer

C. Recumbent

Explanation

The correct answer is C, Recumbent. In a recumbent fold the rock layers are pushed over so far that the fold lies on its side and its axial plane is almost horizontal.

Folds form when layers of rock are squeezed by forces inside the earth, as when plates collide. As the squeezing grows, an upright fold leans over, becomes overturned and finally lies flat, which is the recumbent stage. If the pressure continues, the fold may break and slide forward along a low fault as a nappe. Recumbent folds and nappes are common in young fold mountains such as the Alps and the Himalayas.

A is wrong because in an isoclinal fold the two limbs are parallel to each other, but the axial plane can be upright or inclined. B is wrong because an anticline is an upfold with limbs dipping away from a usually upright axial plane. D is wrong because a monocline is a simple step-like bend in which layers dip in one direction only.

Exam tip: the order is symmetrical, asymmetrical, overturned, recumbent, then nappe; recumbent means lying on its side.

Practice Questions

View all
Q2.GeographyAsked in: CDS · CDS-II 2017, GKMedium

Which of the following statements is/are correct? 1. Himalayan rivers have their origin in the snow-covered areas, hence are dry in winter season. 2. Rivers of the Peninsular Plateau have reached maturity. 3. Himalayan rivers depict all the three stages of normal cycle of erosion. Select the correct answer using the code given below.

  1. A.2 only
  2. B.1 and 3 only
  3. C.2 and 3 only
  4. D.1, 2 and 3
Show answer
Correct answer: C. 2 and 3 only

Himalayan rivers are perennial, so statement 1 is wrong, while statements 2 and 3 are correct. Himalayan rivers such as the Ganga, Indus and Brahmaputra rise from glaciers and snowfields and also get monsoon rain, so they flow all year round, including in winter.

Q3.GeographyAsked in: CDS · CDS-II 2017, GKMedium

Which of the following statements related to latitude are true? 1. Rainfall, temperature and vegetation vary with latitude. 2. The difference between the longest day and the shortest day increases with latitude. 3. Indira Point is located approximately at 6°45' N latitude. Select the correct answer using the code given below.

  1. A.1 and 2 only
  2. B.1 and 3 only
  3. C.2 and 3 only
  4. D.1, 2 and 3
Show answer
Correct answer: D. 1, 2 and 3

All three statements about latitude are true. Latitude decides how directly the Sun's rays strike a place, so temperature, rainfall and the type of vegetation change from the equator towards the poles, from hot, wet rainforests to cold tundra.

Q4.GeographyAsked in: CDS · CDS-II 2017, GKMedium

Which of the following lakes is/are situated in Ladakh? 1. Tso Kar 2. Pangong Tso 3. Tsomgo 4. Tso Moriri Select the correct answer using the code given below.

  1. A.1 only
  2. B.2 and 3
  3. C.1, 2 and 4
  4. D.2 and 4 only
Show answer
Correct answer: C. 1, 2 and 4

Tso Kar, Pangong Tso and Tso Moriri are high-altitude lakes of Ladakh, while Tsomgo lies in Sikkim. Pangong Tso, at about 4,350 metres, is a long, narrow lake that stretches from Ladakh into Tibet, and most of its length lies on the Chinese side.