Previous Year Questions - Drainage Class 9 Notes | EduRev

Social Studies (SST) Class 9

Class 9 : Previous Year Questions - Drainage Class 9 Notes | EduRev

The document Previous Year Questions - Drainage Class 9 Notes | EduRev is a part of the Class 9 Course Social Studies (SST) Class 9.
All you need of Class 9 at this link: Class 9

Short Answers Type Questions

Q1. What is the major reason for the non-perennial nature of the peninsular rivers?    [CBSE 2017]

These rivers are non-perennial because they are dependent on rainfall.


Q2. Explain three common features of the Narmada and Tapi rivers.     [CBSE 2017]

The common features of the Narmada and Tapi rivers are as mentioned below:

  • Both the rivers flow in rift valleys.
  • Both are the only long rivers which flow west.
  • Both the rivers make estuaries.Previous Year Questions - Drainage Class 9 Notes | EduRevNarmada RiverPrevious Year Questions - Drainage Class 9 Notes | EduRevTapi River


Q3. Describe any three important features of the Mahanadi basin.     [CBSE 2015]

The three important features of the Mahanadi basin are:

  • Mahanadi basin covers parts of the states of Chhattisgarh, Jharkhand, Odisha and Maharashtra.
  • It rises in the highlands of Chhattisgarh and flows through Odisha to form a delta in the Bay of Bengal. Its length is 860 km,
  • Due to the devastating floods that the river causes every year, the Hirakund dam has been built on it.


Q4. What is the difference between a Tributary and a Distributary?     [CBSE 2015]

Previous Year Questions - Drainage Class 9 Notes | EduRev


Long Answers Type Questions

Q1. What are the factors for the formation of patterns within a drainage basin? Which are different types of patterns? Explain how do these patterns develop?     [CBSE 2017]

The main factors for the formation of drainage patterns are as given below :

  • The slope of the land.
  • Underlying rock structure.
  • Climatic conditions of the area.

Different types of patterns are dendritic, trellis, rectangular, and radial patterns.
These patterns develop as mentioned below :

  • Dendritic: The dendritic pattern develops where the river channel follows the slope of the terrain. The stream with its tributaries resembles the branches of a tree, thus the name dendritic.
  • Trellis: A river joined by its tributaries, at approximately right angles, develops a trellis pattern. This pattern develops where hard and soft rocks exist parallel to each other.
  • Rectangular: A rectangular drainage pattern develops on a strongly jointed rocky terrain.
  • Radial: A radial pattern develops when streams flow in different directions from a central peak or dome-like structure.
    A combination of several patterns may be found in the same drainage basin.
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