DHARM
N-GEO\OBJ.PM5 883OBJECTIVE QUESTIONS 883
- Allen Hazen’s empirical relationship between the coefficient of permeability and effec-
tive size is ............. - Poiseuille’s equation (law) relates to ............ flow through a .............
- Specific or absolute permeability varies with the permeant characteristics like viscosity
and unit weight. True/False. - Entrapped air ............ the permeability of soil.
- Organic matter increases the permeability of a soil. True/False
- Horizontal permeability is smaller than vertical permeability in a layered deposit. True/
False - ‘Capillary fringe’ means .............
- Capillary height is dependent upon the shape of the Capillary tube. True/False
- The pore water pressure in the capillary zone is
(a) zero (b) positive
(c) negative (d) very low - The shape factor of a flow net is ............. It is independent of the ............ of the soil.
- Flow through an earth dam is a case of ............ flow.
- When steady seepage occurs in isotropic soil, the head causing flow satisfies .............
equation. - If kx and kz are the permeabilities in the x-and z-directions respectively in a two-dimen-
sional flow situation, the effective permeability ke is given by:
(a)ke = kkxz (b)ke = kx/kz
(c)ke = kx + kz (d) None of the above - The critical hydraulic gradient ic for a soil with a grain specific gravity G and a void
ratio e is
(a)ic =Ge
e+
1 + (b)ic =G
e+
+1
1(c)ic =G
e−
+1
1 (d) None of these- The seepage force j per unit volume is given by .............
- For upward flow, the effective stress at any point in a soil is ............ by an amount equal
to the seepage force. - The aim of doubling the pressure each time in the consolidation test is to see that the
soil is always in a ............ condition. - The maximum overconsolidation ratio of normally consolidated soil is .............
- The compressibility of a field deposit is
(a) the same as that shown by a laboratory sample
(b) somewhat greater than that shown by a laboratory sample
(c) some what smaller than that shown by a laboratory sample
(d) not at all related to that of a laboratory sample.