Question

Statement (I): Flow over sharp-crested weirs, standing wave flumes and abrupt free overfalls at ends of long straight channels are examples of rapidly varied flow.

Statement (II): The above-listed flows are all essentially local phenomena and can be utilized for flow measurement in open channels.
1. Both Statement (I) and Statement (II) are individually true and Statement (II) is the correct explanation of Statement (I)
2. Both Statement (I) and Statement (II) are individually true but Statement (II) is not the correct explanation of Statement (I)
3.

​Statement (I) is true but Statement (II) is false

4. Statement (I) is false but Statement (II) is true (II) is true

Answer 1

Correct Answer - Option 2 : Both Statement (I) and Statement (II) are individually true but Statement (II) is not the correct explanation of Statement (I)

Rapidly varied flow:

When the flow properties (such as velocity, density etc.) change with respect to space i.e. along with the flow, it is called varied flow.

Depending upon the changes it can be either gradually or rapidly varied flow.

Flow over sharp-crested weirs, standing wave flumes and abrupt free overfalls at ends of long straight channels are an example of rapidly varied flow where the flow properties change in a short reach.

All of these flows are essentially local phenomena and are utilized for flow measurement in open channels.

∴ Both Statement (I) and Statement (II) are individually true but Statement (II) is not the correct explanation of Statement (I).