Tag: rivers

Questions Related to rivers

Which of the following plays important role in chemical weathering?

geography rivers, coasts and glaciation rivers rivers and their work exogenic forces

  1. Temperature

  2. Water

  3. Crystal growth

  4. Frost

Show answer
Correct Option: B
Explanation:

Water plays an important role in chemical weathering. Rock is a mixture of many minerals and water is a universal solvent. Chemical weathering takes place in the areas which receives heavy rainfall. Chemical weathering occurs in the following ways: Carbonation, Solution and Oxidation.

Which one is a type of weathering?

geography rivers, coasts and glaciation rivers rivers and their work exogenic forces

  1. Mechanical weathering

  2. Chemical weathering

  3. Biological weathering

  4. All of above

Show answer
Correct Option: D
Explanation:
Breaking or weakening of rocks is a natural phenomenon. It is called weathering. Weathering can be of three type:-
  • Mechanical weathering
  • Chemical weathering
  • Biological weathering

What is rust?

geography rivers, coasts and glaciation rivers rivers and their work exogenic forces

  1. Chemical reaction between oxygen and iron

  2. Chemical reaction between carbon dioxide and iron

  3. Chemical reaction between alkalis and iron

  4. None of these

Show answer
Correct Option: A
Explanation:

The iron in the rock comes in contact with water and chemical reaction takes place between iron and oxygen. Hence,a reddish coloured layer forms on the rocks. This is called rust.

When water penetrates through sandstone rocks, the particles get loose and separate from the main rock. What type of weathering is this ?

geography rivers, coasts and glaciation rivers rivers and their work exogenic forces

  1. Granular weathering

  2. Mechanical weathering

  3. Chemical weathering

  4. Biological weathering

Show answer
Correct Option: A
Explanation:

When water penetrates through sandstone rocks, the particles get loose and separate from the main rock. This is called granular weathering.

Which of the following animal is/are called burrowing animals?

geography rivers, coasts and glaciation rivers rivers and their work exogenic forces

  1. Rats

  2. Mice

  3. Rabbits

  4. All of above

Show answer
Correct Option: D
Explanation:

Ants make large anthills. Rats, mice, rabbits and other worms and insects make burrows in the ground. These animals are called burrowing animals.

Lime stone is formed due to chemical precipitation between ____________.

geography rivers, coasts and glaciation rivers rivers and their work exogenic forces

  1. Water and Carbon dioxide

  2. Water and Iron

  3. Water and Alkalis

  4. None of these

Show answer
Correct Option: C
Explanation:

Lime stone is formed due to chemical precipitation between water and alkalis. At Wadgaon Darya in Ahmadnagar district, limestones gets precipitated chemically i.e. undergoes chemical weathering. Similarly, because of solution, alkalis in the rock dissolve and make them brittle.

How the chemical weathering occurs?

geography rivers, coasts and glaciation rivers rivers and their work exogenic forces

  1. By carbonation

  2. By solution

  3. By oxidation

  4. All of above

Show answer
Correct Option: D
Explanation:

Chemical weathering occurs in following ways:-

  • By carbonation
  • By solution
  • By oxidation

Mechanical weathering is more dominant in the ______.

geography rivers, coasts and glaciation rivers rivers and their work exogenic forces

  1. humid climate

  2. arid climate

  3. temperate climate

  4. polar climate

Show answer
Correct Option: B
Explanation:

The arid or hot desert areas dominated by mechanical weathering. Due to the high diurnal range of temperature in the arid areas, repeated expansion and contraction of the outer layer of the rock takes place. The rocks then disintegrate along these joints and big blocks of rocks are dislodged from the main rock mass and fall down the slope under the impact of gravity.

Breaking or weakening of rocks is called _________.

geography rivers, coasts and glaciation rivers rivers and their work exogenic forces

  1. weathering

  2. erosion

  3. landslide

  4. mass movement

Show answer
Correct Option: A
Explanation:

Weathering refers to the breakdown or disintegration and decomposition of rocks in situ through mechanical and chemical changes in rock. The nature and magnitude of weathering differs from place to place and region to region. 

When water penetrates through the rocks, the particles get loose and separate from the main rock, this type of weathering is called ______________.

geography rivers, coasts and glaciation rivers rivers and their work exogenic forces

  1. chemical weathering

  2. biological weathering

  3. granular weathering

  4. none of the above

Show answer
Correct Option: C
Explanation:

Weathering is a process used to explain the breakdown of the rocks due to exposure to the atmosphere. Weathering down of the rock into small pieces is called disintegration. It is in granular weathering, when water penetrates through the rocks, the particles get loose and separate from the main rock. It is a process where a rock disintegrates due to frost action. The water in the rocks freezes as well as liquify at the same time. The rock disintegrates because of heating and cooling at the same time, which result in the expansion and contraction of minerals in the rock breaking it into small pieces.