Impact Assessment Methodologies Questions and Answers

Q: Which one of the following does not belong to EIA methods used for assessing the impacts of developmental activities on the environment ?

The item that does not belong to the EIA methods is the 'flexible' method.The recognised methods for identifying and assessing impacts include checklists, ad hoc methods, networks, matrices and overlays. Checklist, Adhoc and Network are all standard methods named in the list, so they cannot be the odd one out. 'Flexible' is not the name of any EIA method.

11.

Which of the following is true regarding the Leopold interaction matrix used in Environmental Impact Assessment Process ?

A.It can be expanded.
B.It can be contracted.
C.It can be contracted and expanded.
D.It cannot be contracted and expanded.

Exam Year(s)

UGC NET - 2012,

Answer: C

The Leopold interaction matrix can be contracted and expanded, option C. The matrix lists project actions along one axis and environmental characteristics along the other, and it can be adjusted to the case, by dropping the items that do not apply or adding new ones.

Option A, that it can only be expanded, and option B, that it can only be contracted, are each half of the statement. Option D, that it cannot be adjusted, is wrong since the flexibility of the matrix is a stated feature of the method. The answer is the one that includes both.

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12.

Which one of the following does not belong to EIA methods used for assessing the impacts of developmental activities on the environment ?

A.Checklist
B.Adhoc
C.Network
D.Flexible

Exam Year(s)

UGC NET - 2013,

Answer: D

The item that does not belong to the EIA methods is the 'flexible' method.

The recognised methods for identifying and assessing impacts include checklists, ad hoc methods, networks, matrices and overlays. Checklist, Adhoc and Network are all standard methods named in the list, so they cannot be the odd one out. 'Flexible' is not the name of any EIA method.

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13.

Match List - I with List - II and choose the correct answer from the codes given below :

List - I (Analytical functions)	List - II (Activity under the function)
(a) Defining scope of EIA	i. Critical Assessment of impacts
(b) Identification of impacts	ii. Estimation of the probability that a particular impact will occur
(c) Prediction of Impacts	iii. Description of the existing environment system
(d) Impact Evaluation and Analysis	iv. Deciding important issues and concerns

Codes : (a) (b) (c) (d)

A.iii iv i ii
B.iv iii ii i
C.ii i iii iv
D.i ii iv iii

Exam Year(s)

UGC NET - 2013,

Answer: B

The correct matching is a-iv, b-iii, c-ii, d-i, which is code B. Defining the scope of an EIA means deciding which issues and concerns are important, identification of impacts needs a description of the existing environment, prediction of impacts is the estimate of the probability that an impact will occur, and impact evaluation is the critical assessment of the impacts.

The other codes pair these steps with the wrong activities, for example code A gives scoping the description of the environment.

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14.

A drawback of checklists is

A.Preliminary analysis is available in scaling checklist
B.Checklists are too general or incomplete
C.Checklists summarises information to make it available to experts
D.Ecosystem functions can be clearly understood from weighting methods

Exam Year(s)

UGC NET - 2013,

Answer: B

A drawback of checklists is that they are too general or incomplete. They list factors to consider but do not show the links between impacts and often miss site-specific items.

The other options describe features that are advantages or unrelated statements: preliminary analysis in a scaling checklist, summarising information for experts, and understanding ecosystem functions through weighting are not given as drawbacks.

Testing each of the remaining options against the same fact shows that every one of them fails on the point the question is asking about, which confirms the keyed answer.

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15.

If \(EIU_j\) = environmental impact units for j-th alternative, \(EQ_{ij}\) = environmental - quality - scale value for i-th factor and j-th alternative, \(PIU_i\) = parameter importance units for i-th factor, then what is the correct formulation for the index expressed in environmental impact units (\(EIU_j\)) ?

A.\(EIU_j = \sum_{i=1}^{n} \left(\frac{E}{Q_{ij}}\right) PIU_i\)
B.\(EIU_j = \sum_{i=1}^{n} \left(\frac{Q_{ij}}{E}\right) PIU_i\)
C.\(EIU_j = \sum_{i=1}^{n} EQ_{ij}\, PIU_i\)
D.\(EIU_j = \sum_{i=1}^{n} \frac{PIU_i}{EQ_{ij}}\)

Exam Year(s)

UGC NET - 2013,

Answer: C

The index in environmental impact units is the sum over the factors of the environmental quality scale value multiplied by the parameter importance units, as in the Battelle type of method.

\[ EIU_j = \sum_{i=1}^{n} EQ_{ij} \, PIU_i \]

This is option C. The options that divide by EQ or involve a ratio of E to Q do not give a weighted sum of quality values.

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16.

Match List - I with List - II and choose the correct answer from the codes given below :

List - I (Scales used in EIA methods)	List - II (Example)
a. Nominal	i. Temperature (degrees)
b. Ordinal	ii. Species classification
c. Interval	iii. Map scale
d. Ratio	iv. Worst to best

Codes :
(a) (b) (c) (d)

A.i ii iii iv
B.iv iii ii i
C.iii i iv ii
D.ii iv i iii

Exam Year(s)

UGC NET - 2013,

Answer: D

The correct matching is a-ii, b-iv, c-i, d-iii, which is code D. A nominal scale classifies without order, as in species classification. An ordinal scale ranks, as in worst to best. An interval scale has equal steps with no true zero, as in temperature in degrees. A ratio scale has a true zero, as in a map scale.

The other codes pair at least one scale with the wrong example.

Testing each of the remaining options against the same fact shows that every one of them fails on the point the question is asking about, which confirms the keyed answer.

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17.

Which is the correct sequence for impact assessment process in EIA ?

A.Description of Environment → Identification of impacts → Prediction of impacts → Evaluation of impacts → Identification of mitigation needs.
B.Identification of impacts → Prediction of impacts → Evaluation of impacts →Identification of mitigation needs.
C.Identification of impacts → Description of Environment → Prediction of impacts → Evaluation of impacts → Identification of mitigation needs.
D.Prediction of impacts → Identification of impacts → Description of environment → Evaluation of impacts → Identification of mitigation needs.

Exam Year(s)

UGC NET - 2013,

Answer: A

The impact assessment starts with a description of the existing environment, which is the baseline. Then impacts are identified, predicted and evaluated, and finally the need for mitigation is identified.

The other sequences leave out the baseline description (option B) or put it after identification of impacts (option C), or begin with prediction before any impact has been identified (option D). The baseline has to come first, so the answer is option A.

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