Soil Science Lab Exam 2 Updated Actual Questions And Correct Answers

SOIL SCIENCE LAB EXAM 2 UPDATED ACTUAL
QUESTIONS AND CORRECT ANSWERS
Question:
1. there is a direct relationship between what and what in the given weight of the soil?
Answer:
particle size and surface area

Question:
2. the determination of the proportion of solid particles in different size ranges
Answer:
mechanical analysis

Question:
3. separating soil particles based on their differential settling rate in water
Answer:
bouyoucos method

Question:
4. what two basic principals are combined the the bouyoucos method?
Answer:
dispersion and sedimentation

Question:
5. soil particles must be separated from each other and remain separated during the determination of
particle size distribution
Answer:
dispersion

Question:
6. texture does not include what?
Answer:
organic matter

Question:
7. what is effective for dispersing larger aggregates?
Answer:
mechanical stirring

Question:
8. what is effective for dispersing small, aggregated clay groups?
Answer:
chemical dispersion

Question:
9. what is an effective chemical dispersant?

, Answer:
sodium hexametaphosphate

Question:
10. what is soil suspension?
Answer:
the mixture of dispersed soil particles in water

Question:
11. particles will fall at a velocity which is controlled by the radius of the particle, gravity, density and
viscosity
Answer:
stokes law

Question:
12. an instrument used for measuring the relative density of liquids based on the concept of buoyancy
(bouncy bubble instrument)
Answer:
hydrometer

Question:
13. particles between what diameter fall below a hydrometer?
Answer:
.05-2mm

Question:
14. a hydrometer only measures what?
Answer:
the concentration of silt plus clay left in suspension

Question:
15. stokes law equation
Answer:
V= 34700r^2

Question:
16. after 40 seconds, what settles?
Answer:
sand

Question:
17. after 2 hours, what settles?
Answer:
silt

Question:
18. what is a hydrometer calibrated to read?