Engineering Questions with Answers - Multiple Choice Questions

# Constant and Falling Head Permeability Test

1 - Question

Falling head permeability test can be used for ___________
a) Coarse-grained soil
b) Less permeable soil
c) Clayey soil
d) All of the mentioned
Explanation: Falling head test is used for relatively less permeable soils where the discharge is small.

2 - Question

Which of the following formula is used in Falling head permeability test?
a) Jacky’s formula
b) Louden’s formula
c) Darcy’s law
d) Kozney’s formula
Explanation: In falling head permeability test, Darcy’s law is used from which the rate of flow q, can be used q = K i A.

3 - Question

In falling head permeability test apparatus, the water head at any time instant is equal to ____________
a) Difference in the water level
b) Cross-sectional area of pipe
c) Height of permeameter
d) None of the mentioned
Explanation: The head h1 and h2 at any time instant t is equal to the difference in the water level in the stand pipe and the bottom tank.

4 - Question

In constant permeability test, the length of specimen is measured by ___________
a) Calculating the difference in water level
b) Using Piezometric tube
c) Using measuring scale
d) None of the mentioned
Explanation: In a constant head test, the length of the sample is measured by inserting piezometric tubes on top and bottom.

5 - Question

The constant head permeability test is used for ___________
a) Fine-grained soil
b) Coarse-grained soil
c) Clay soil
d) Saturated soil
Explanation: Coarse-grained soil, for which a reasonable discharge can be collected in a given time, is used in constant test.

6 - Question

The laboratory observation falling head test consist of measurements of ____________
a) h1 at an interval of t1 and h2 at an interval of t2
b) Only t1 and t2
c) None of the mentioned
d) All of the mentioned
Explanation: The laboratory measurement of falling head permeability test consists of measurement of the heads h1 and h2 at two chosen time intervals t1 and t2.

7 - Question

Which of the following tubes are used in the constant head test?
a) Inlet tube
b) Overflow tube
c) Outlet tube
d) All of the mentioned
Explanation: The constant head test apparatus consists of three tubes: the inlet tube, the overflow tube and outlet tube.

8 - Question

In falling head permeability test, change in the head at a time interval dt is denoted as ___________
a) dh
b) –dh
c) h
d) –h