1. Notches are used to measure

- velocity
- flow rate
- pressure
- all above

2. For which angle of triangular notch the discharge over it is maximum?

- 45°
- 30°
- 90°
- 60°

3. The discharge over a rectangular notch is

- inversely proportional to H
^{3/2} - directly proportional to H
^{3/2} - inversely proportional to H
^{5/2} - directly proportion to H
^{5/2}

4. Which notch is preferred for measuring the low discharges?

- triangular notch
- rectangular notch
- trapezoidal notch
- parabolic notch

5. The discharge through a V-notch varies as

- H
- H
^{1.5} - H
^{0.5} - H
^{2.5}

6. The sheet of water flowing through a notch or weir is known as

- Nappe
- Crest notch
- Crested weir
- Crest

7. In any channel, notch is used to measure the following

- discharge
- pressure
- velocity
- static energy

8. Discharge Q in a triangular weir varies as

- H
^{1/2} - H
- H
^{3/2} - H
^{5/2}

9. Which notch is preferable for low flow rates?

- Rectangular
- Triangular
- Both Rectangular and Triangular
- None of these

10. In a 90° triangular notch, the error in the estimated discharge for a given head due to an error of 1% in cutting the vertex angle is

- 1 %
- zero
- π/2 %
- π %

11. If H is the head, the discharge through a V-notch varies

- proportional to head (H)
- inversely proportional to angle θ
- inversely proportional to tan θ/2
- proportional to H
^{5/2}

12. The discharge through a V-notch varies with the depth of water H as

- H
^{1/2} - H
^{3/2} - H
^{5/2} - H
^{-1/2}

13. For maximum discharge over a triangular notch, the angle of the notch should be

- 60°
- 30°
- 120°
- 90°

14. Notch is used for measuring

- velocity through a small channel
- rate of flow through a pipe
- velocity through a pipe
- rate of flow through a small channel

15. Notch is a device used for measuring

- rate of flow through pipes
- rate of flow through a small channel
- velocity through a pipe
- velocity through a small channel

16. The rate of flow through a V-notch varies

- H
- H
^{1/2} - H
^{5/2} - H
^{3/2}

17. A triangular notch is more accurate measuring device than a rectangular notch

- for low flow rates
- for medium flow rates
- for high flow rates
- for all flow rates

18. The discharge over a rectangular notch is

- directly proportional to H
^{5/2} - directly proportional to H
^{3/2} - inversely proportional to H
^{3/2} - inversely proportional to H
^{5/2}

19. The head over a 90° V-notch increases from 0.20 m to 0.40 m. The ratio of the new discharge to the original discharge is

- 1.414
- 2.000
- 4.000
- more than 4.000

20. The percentage error in the computed discharge over a triangular notch corresponding to an error of 1% in the measurement of the head over the notch, would be

- 2.5
- 2
- 2.2
- 1.5