CSES 2040 EXAM 2, CSES 2040
TEST 2 (AUBURN-HULUKA)
ACTUAL QUESTIONS AND 100%
VERIFIED ANSWERS
The two main sources of charges in soil are the permanent (constant)
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charge and the pH dependent charge.
| | | | | |
a. True
b. False - CORRECT-ANSWER-a. True
| | |
is the amount of cation charges that a soil can hold at its
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natural or apparent pH.
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a. CEC at pH=7.0
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b. neutral pH |
c. CEC at pH=8.2
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d. Effective CEC - CORRECT-ANSWER-d. Effective CEC
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,As the intensity of weathering on clay minerals increases, its cation
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exchangeable capacity decreases.
| | |
a. True
b. False - CORRECT-ANSWER-a. True
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The CEC of an organic soil will:
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a. decrease as pH increases | | |
b. increase as pH increases | | |
c. remain the same | |
d. none of the above - CORRECT-ANSWER-b. increase as pH increases
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A given soil has significant amount of NH4+ on its exchangeable sites
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from NH4+ application. If you use NH4+ to displace the cations and
| | | | | | | | | | | |
measured the CEC by summation of the displaced cations, you will
| | | | | | | | | | |
CEC of the soil. | | |
a. overestimate
b. underestimate
c. estimate the correct | |
,d. none of the above - CORRECT-ANSWER-b. underestimate
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An alkaline soil contains 20% clay and 3% humus. If the pure clay has a
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CEC of 40cmolc/kg and the humus 200cmolc/kg, calculate the CEC
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(cmolc/kg) of the soil.
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a. 8
b. 30
c. 14
d. 16 - CORRECT-ANSWER-c. 14
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If pH of a soil is7, its pOH will be:
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a. 7
b. 14
c. 6
d. a and b - CORRECT-ANSWER-a. 7
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A soil at pH 4.0 will have
| | | | | | | H+ activity compared to a soil at pH
| | | | | | |
8.0.
|
, a. 4000x more |
b. 4000x less |
c. 10,000x more |
d. 10,000x less - CORRECT-ANSWER-c. 10,000x more
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If a growing plant root takes K+1, NH4+1, and SO4-2 from soil solution
| | | | | | | | | | | |
|concurrently, the pH of the solution will:
| | | | | |
a. increase
b. decrease
c. remain the same | |
d. cannot be determined - CORRECT-ANSWER-c. remain the same
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Active soil acidity is a measure of the H+ ion activity in the soil solution.
| | | | | | | | | | | | | |
a. True
b. False - CORRECT-ANSWER-a. True
| | |
TEST 2 (AUBURN-HULUKA)
ACTUAL QUESTIONS AND 100%
VERIFIED ANSWERS
The two main sources of charges in soil are the permanent (constant)
| | | | | | | | | | |
charge and the pH dependent charge.
| | | | | |
a. True
b. False - CORRECT-ANSWER-a. True
| | |
is the amount of cation charges that a soil can hold at its
| | | | | | | | | | | |
natural or apparent pH.
| | | |
a. CEC at pH=7.0
| |
b. neutral pH |
c. CEC at pH=8.2
| |
d. Effective CEC - CORRECT-ANSWER-d. Effective CEC
| | | | |
,As the intensity of weathering on clay minerals increases, its cation
| | | | | | | | | |
exchangeable capacity decreases.
| | |
a. True
b. False - CORRECT-ANSWER-a. True
| | |
The CEC of an organic soil will:
| | | | | |
a. decrease as pH increases | | |
b. increase as pH increases | | |
c. remain the same | |
d. none of the above - CORRECT-ANSWER-b. increase as pH increases
| | | | | | | | |
A given soil has significant amount of NH4+ on its exchangeable sites
| | | | | | | | | | |
from NH4+ application. If you use NH4+ to displace the cations and
| | | | | | | | | | | |
measured the CEC by summation of the displaced cations, you will
| | | | | | | | | | |
CEC of the soil. | | |
a. overestimate
b. underestimate
c. estimate the correct | |
,d. none of the above - CORRECT-ANSWER-b. underestimate
| | | | | |
An alkaline soil contains 20% clay and 3% humus. If the pure clay has a
| | | | | | | | | | | | | |
CEC of 40cmolc/kg and the humus 200cmolc/kg, calculate the CEC
| | | | | | | | | |
(cmolc/kg) of the soil.
| | | |
a. 8
b. 30
c. 14
d. 16 - CORRECT-ANSWER-c. 14
| | |
If pH of a soil is7, its pOH will be:
| | | | | | | | |
a. 7
b. 14
c. 6
d. a and b - CORRECT-ANSWER-a. 7
| | | | |
A soil at pH 4.0 will have
| | | | | | | H+ activity compared to a soil at pH
| | | | | | |
8.0.
|
, a. 4000x more |
b. 4000x less |
c. 10,000x more |
d. 10,000x less - CORRECT-ANSWER-c. 10,000x more
| | | | |
If a growing plant root takes K+1, NH4+1, and SO4-2 from soil solution
| | | | | | | | | | | |
|concurrently, the pH of the solution will:
| | | | | |
a. increase
b. decrease
c. remain the same | |
d. cannot be determined - CORRECT-ANSWER-c. remain the same
| | | | | | |
Active soil acidity is a measure of the H+ ion activity in the soil solution.
| | | | | | | | | | | | | |
a. True
b. False - CORRECT-ANSWER-a. True
| | |
