1. When the plastic limit is equal to or greater than the liquid limit, then plasticity index is ___.
[A] Negative
[B] Zero
[C] One
[D] More than one
Answer: Option B
2. The soil transported by running water is called ____.
[A] Aeolian soil
[B] Alluvial soil
[C] Marine soil
[D] Lacustrine soil
Answer: Option B
3. A soil having particles of nearly the same size known as ____.
[A] Well graded
[B] Poorly graded
[C] Gap graded
[D] Uniformly graded
Answer: Option D
4. Which are the corrections applied to the hydrometer readings?
(i) Meniscus correction
(ii) Temperature correction
(iii) Density correction
(iv) Dispersing agent correction
[A] (i) and (ii)
[B] (i), (ii) and (iii)
[C] (i), (ii), (iii) and (iv)
[D] (i), (ii) and (iv)
Answer: Option D
Solution:
1. Meniscus correction:
The hydrometer readings increase downward on the stem.
Meniscus correction (Cm) is always positive (+ve).
2. Temperature correction:
Temperature more than calibration temperature, Observed Reading is Less, Correction = +ve
Temperature less than calibration temperature, Observed Reading is More, Correction = -ve
3. Dispersing agent correction:
The addition of the dispersing agent increases the density of the suspension.
Correction (Cd) is applied which is always negative (-ve).
5. According to IS Classification system, the soils can be classified into
[A] 18 Groups
[B] 15 Groups
[C] 3 Groups
[D] 7 Groups
Answer: Option A