Page 110 - Biology - XII

VIVA VOCE

Q1. What is smoke?
Ans. A mixture of various gases, dust, soot particles.

Q2. Why did you choose this project for study?
Ans. Because of heavy air pollution, a considerable amount of air pollution is caused by automobiles.
So, I wanted to study about it.

Q3. What is your reading/observation?
Ans. Unmaintained vehicles give high density smoke.

Q4. How did you measure the smoke density?
Ans. I measured the smoke density by using Ringelmann scale.

Q5. What is Ringelmann scale?
Ans. It is the degree of darkness of the white card when subjected to the source of exhaust or smoke.

COMPETENCY BASED QUESTIONS

Multiple Choice Questions

Q1. Main sources of air pollution are
(a) motor vehicles (b) industries-chimney
(c) fossil fuel based plants (d) all of these

Q2. In general, the air quality is judged by the presence of
(a) SO (b) NO X
2
(c) SPM (Suspended particulate matter) (d) SO , NO , SPM
X
2
Q3. The important pollutant from automobile exhaust is
(a) CO (b) CO (c) smoke (d) lead
2
Q4. During peak traffi c hour in Delhi, the automobile emission has
(a) 700 kg CO (b) 250 kg hydrocarbon
(c) 60 kg nitrogen oxides (d) all of these

Q5. CO causes
(a) diffi culty in breathing (b) headache
(c) irritation of mucous membranes (d) all of these

Answer key

1. (d), 2. (d), 3. (b), 4. (d), 5. (d)

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