Risk Assessment in EIA Questions and Answers

Which of the following is true when frequency of occurrence of risk is remote but possible ?

A.Risk is acceptable.
B.Risk reduction measures should be implemented.
C.Risk is unacceptable.
D.Both (A) and (B) are true.

Exam Year(s)

UGC NET - 2012,

Answer: A

In a risk matrix a hazard that is remote but possible has a very low frequency, which puts the risk in the acceptable region, so the risk is regarded as acceptable and needs no mandatory reduction measures. Measures to reduce risk are required where the frequency is higher, in the unacceptable or tolerable-if-reduced bands. Because the risk is acceptable, the statements that it is unacceptable and that both (A) and (B) are true are not correct.

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Which of the following can be considered in Environmental Risk Assessment ?

A.Exposure period
B.Potency of a toxic material
C.Quality of models
D.All of the above

Exam Year(s)

UGC NET - 2012,

Answer: D

All of the above can be considered in environmental risk assessment, option D. The risk from a hazardous substance depends on how long people or organisms are exposed, which is the exposure period, and on how harmful a given dose is, which is the potency of the toxic material.

The quality of the models (option C) matters because risk is estimated with models of dispersion and effect, and a poor model gives an unreliable estimate. Since each of options A, B and C is a relevant consideration, none of them alone is the full answer.

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Given below are two statements, one labelled as Assertion (A) and the other labelled as Reason (R) :

Assertion (A) : When quantitative probabilistic risk assessment is performed on hazardous waste sites they usually turn out to be of relatively low threats.
Reason (R) : In hazardous waste sites the chance of exposure is low because of isolation of drinking water supplies and prevention of access.
Choose the correct answer :

A.Both (A) and (R) are true and (R) is the correct explanation of (A).
B.Both (A) and (R) are true, but (R) is not the correct explanation of (A).
C.(A) is true, but (R) is false.
D.(A) is false, but (R) is true.

Exam Year(s)

UGC NET - 2012,

Answer: A

The key gives option A: both statements are true and the reason explains the assertion. Quantitative risk assessments of hazardous waste sites often show a low threat, because the chance of exposure is low where drinking water supplies are isolated and access is prevented, and that is the reason given. This explanation follows the official key.

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In disaster management which steps are followed in post-disaster recovery phase ?

A.Relief, rehabilitation, reconstruction, learning - review
B.Risk Assessment, mitigation, preparedness, emergency plans.
C.Relief, mitigation, emergency plans.
D.Learning - review, emergency plans, preparedness.

Exam Year(s)

UGC NET - 2013,

Answer: A

The post-disaster recovery phase follows relief, rehabilitation, reconstruction and learning-review. This is the sequence of steps taken after the disaster has struck.

Risk assessment, mitigation, preparedness and emergency plans belong to the pre-disaster phases, so options B, C and D, which mix these in, are not the recovery steps.

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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Risk assessment in EIA does not involve

A.Maximum credible analysis
B.Hazard and operability studies
C.Preparation of disaster management plan
D.Assessment of economic benefit arising out of a project

Exam Year(s)

UGC NET - 2013,

Answer: D

Risk assessment in an EIA does not involve the assessment of economic benefit arising out of a project. Benefit is dealt with in cost-benefit analysis, not in risk assessment.

Maximum credible loss analysis, hazard and operability studies and the preparation of a disaster management plan are all steps of risk assessment and management for hazardous projects.

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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Risk assessment is different from Environmental Impact Assessment in terms of

A.Hazard identification
B.Disaster management
C.Probability expression
D.Consideration of human environment

Exam Year(s)

UGC NET - 2013,

Answer: C

Risk assessment differs from Environmental Impact Assessment in its expression of probability, option (C). A risk assessment states the chance, or probability, that a hazard will cause harm, and puts the risk in numbers, whereas an EIA predicts the nature and size of the effects of a project and does not state them as probabilities. Hazard identification (A) is a step in both, disaster management (B) is a separate planning exercise, and consideration of the human environment (D) is part of the EIA.

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Significant hazard/accident factor to be considered under risk assessment of distillaries are

A.toxic gas release and human accident
B.pressure wave and heat radiation
C.toxic gas release and radiation
D.pressure wave and toxic gas release

Exam Year(s)

UGC NET - 2014,

Answer: B

The significant hazard factors considered in the risk assessment of distilleries are pressure wave and heat radiation, which arise from fire and explosion of the alcohol and other flammable liquids stored and processed.

Toxic gas release is the main concern in chemical plants that handle toxic gases, not in alcohol distilleries, so the options with toxic gas release are wrong.

A distillery stores large amounts of alcohol and spirit, so a release leads to fire, and the blast from an explosion produces a pressure wave while the fire gives out heat radiation.

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