UPSC Exam > UPSC Questions > Consider the following statements. 1. Permea...
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Consider the following statements.
1. Permeable or pervious rocks are those which allow water to pass through them easily
2. All porous rocks are permeable
Which of these statements is/are correct?
- a)1 only
- b)2 only
- c)Both of them
- d)Neither of them
Correct answer is option 'A'. Can you explain this answer?
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Most Upvoted Answer
Consider the following statements. 1. Permeable or pervious rocks are...
Statement 1: Permeable or pervious rocks are those which allow water to pass through them easily.
Statement 2: All porous rocks are permeable.
Explanation:
- Permeable rocks: Permeable rocks are the rocks that have interconnected pores or openings that allow fluids, such as water or gas, to flow through them. These rocks have high permeability and can transmit fluids easily.
- Porous rocks: Porous rocks are the rocks that have small spaces or voids within them. These voids are called pores. These rocks can absorb and retain fluids within their pores but may or may not allow the fluid to flow through them easily.
- Relationship between permeability and porosity: Porosity refers to the percentage of void space in a rock or sediment. It is a measure of how much fluid a rock can hold. Permeability, on the other hand, refers to how easily a fluid can flow through a rock. While all permeable rocks are porous, not all porous rocks are permeable. The permeability of a rock depends on the interconnectivity of its pores. If the pores are well-connected, the rock will be permeable, allowing fluid to flow through it easily. If the pores are isolated or not well-connected, the rock will be less permeable or even impermeable, hindering fluid flow.
- Statement analysis:
- Statement 1: The statement is true. Permeable rocks are those rocks that allow water to pass through them easily. As explained above, permeable rocks have interconnected pores that facilitate fluid flow.
- Statement 2: The statement is false. All porous rocks are not necessarily permeable. Porosity refers to the presence of void spaces or pores in a rock, but it does not guarantee permeability. Permeability depends on the interconnectivity of these pores.
Conclusion:
- From the above analysis, it can be concluded that statement 1 is correct, but statement 2 is incorrect.
- Therefore, the correct answer is option 'A' - 1 only.
Statement 2: All porous rocks are permeable.
Explanation:
- Permeable rocks: Permeable rocks are the rocks that have interconnected pores or openings that allow fluids, such as water or gas, to flow through them. These rocks have high permeability and can transmit fluids easily.
- Porous rocks: Porous rocks are the rocks that have small spaces or voids within them. These voids are called pores. These rocks can absorb and retain fluids within their pores but may or may not allow the fluid to flow through them easily.
- Relationship between permeability and porosity: Porosity refers to the percentage of void space in a rock or sediment. It is a measure of how much fluid a rock can hold. Permeability, on the other hand, refers to how easily a fluid can flow through a rock. While all permeable rocks are porous, not all porous rocks are permeable. The permeability of a rock depends on the interconnectivity of its pores. If the pores are well-connected, the rock will be permeable, allowing fluid to flow through it easily. If the pores are isolated or not well-connected, the rock will be less permeable or even impermeable, hindering fluid flow.
- Statement analysis:
- Statement 1: The statement is true. Permeable rocks are those rocks that allow water to pass through them easily. As explained above, permeable rocks have interconnected pores that facilitate fluid flow.
- Statement 2: The statement is false. All porous rocks are not necessarily permeable. Porosity refers to the presence of void spaces or pores in a rock, but it does not guarantee permeability. Permeability depends on the interconnectivity of these pores.
Conclusion:
- From the above analysis, it can be concluded that statement 1 is correct, but statement 2 is incorrect.
- Therefore, the correct answer is option 'A' - 1 only.
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Community Answer
Consider the following statements. 1. Permeable or pervious rocks are...
- Porous rocks are those, like sandstone, which have many pore-spaces between the grains.
- Water is easily absorbed by such rocks and may be stored in the pore-spaces. Permeable or pervious rocks are those which allow water to pass through them easily.
- Thus most porous rocks are also permeable. However, some rocks are porous but impermeable. For example, Clay is highly porous since it is made up of innumerable wonderful particles with pore-spaces between them.
- It thus absorbs a great deal of water. However, the pore-spaces are so small that the water does not move easily through the rock, impermeable.
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Consider the following statements. 1. Permeable or pervious rocks are those which allow water to pass through them easily 2. All porous rocks are permeable Which of these statements is/are correct?a) 1 onlyb) 2 onlyc) Both of themd) Neither of themCorrect answer is option 'A'. Can you explain this answer?
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