# Fluid Mechanics Questions and Answers – Classification of Notches and Weirs

This set of Fluid Mechanics Multiple Choice Questions & Answers (MCQs) focuses on “Classification of Notches and Weirs”.

1. A notch is a device used to measure the turbulence of the flowing liquid directly.
a) True
b) False

Explanation: A notch is a device used to measure the flow rate of the flowing liquid, directly.

2. The weir is an attachable structure made up of thermoplastic.
a) True
b) False

Explanation: The weir is a permanent masonry structure made up of concrete.

3. The notch is bigger in size than wier.
a) True
b) False

Explanation: The weir is bigger in size than notch.

4. The MoM (Material of Manufacture) of notch is,
a) Thermoplastic
b) Metals
c) Fibre
d) Wood

Explanation: The MoM (Material of Manufacture) of notch is Metals.

5. Which of the following is not a way of classifying notches or weirs?
a) Based on the shape of opening
b) Based on the effect of the sides on the nappe
c) Based on the shape of the crest
d) Based on the effect of the sides on the crest

Explanation: There is no such way of classification.
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6. The nature of discharge is also a way of classifying notches.
a) True
b) False

Explanation: The nature of discharge is also a way of classifying notches.

7. Which of the following is not a way of classifying based on the shape of opening?
a) Rectangular notch
b) Circular notch
c) Trapezoidal notch
d) Stepped notch

Explanation: Circular notch is not a way of classifying based on the shape of opening.

8. Trapezoidal weir has another popular name. What is it?
a) Cipolletti weir
b) Hagen Poiseuille’s weir
c) Reynold’s weir
d) Euler’s weir

Explanation: Trapezoidal weir is also called Cipolletti weir.

9. What is not the way of classifying weir based on their shape of crest?
a) Sharp crested weir
c) Narrow crested weir
d) Trapezoidal crested weir

Explanation: Trapezoidal crested weir is not the way of classifying weir based on their shape of crest.

10. What is not the way of classifying weir based on the emerging nappe?
a) Weir with end contraction
b) Weir without end contraction
c) Weir contraction at the beginning
d) Weir with absence of end contraction

Explanation: This is not the way of classifying weir based on the emerging nappe.

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