Topic: UNIT 15: Environmental Chemistry (Test 2)



Topic: UNIT 15: Environmental Chemistry
Q.1
Release of oxides of nitrogen and hydrocarbons into the atmosphere by motor vehicles is prevented by using _______
A. grit chamber
B. scrubbers
C. trickling filters
D. catalytic convertors
Answer : Option C
Explaination / Solution:
No Explaination.


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Q.2
Biochemical oxygen Demand value less than 5 ppm indicates a water sample to be
A. highly polluted
B. poor in dissolved oxygen
C. rich in dissolved oxygen
D. low COD
Answer : Option C
Explaination / Solution:
No Explaination.


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Q.3
Match the List I with List II and select the correct answer using the code given below the lists

A. A: 3, B: 4, C: 1, D: 2
B. A: 2, B: 1, C: 4, D: 3
C. A: 4, B: 3, C: 2, D: 1
D. A: 2, B: 4, C: 1, D: 3
Answer : Option C
Explaination / Solution:
No Explaination.


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Q.4

A. A: 1, B: 2, C: 3, D: 4
B. A: 3, B: 4, C: 2, D: 1
C. A: 2, B: 3, C: 4, D: 1
D. A: 4, B: 2, C: 1, D: 3
Answer : Option B
Explaination / Solution:
No Explaination.


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Q.5

Assertion (A): If BOD level of water in a reservoir is more than 5 ppm it is highly polluted

Reason(R) : High biological oxygen demand means high activity of bacteria in water

A. Both (A) and R are correct and (R) is the correct explanation of (A)
B. Both (A) and R are correct and (R) is not the correct explanation of (A)
C. Both (A) and R are not correct
D. (A) is correct but( R) is not correct
Answer : Option D
Explaination / Solution:
No Explaination.


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Q.6

Assertion (A): Excessive use of chlorinated pesticide causes soil and water pollution.

Reason (R) : Such pesticides are non-biodegradable.

A. Both (A) and R are correct and (R) is the correct explanation of (A)
B. Both (A) and R are correct and (R) is not the correct explanation of (A)
C. Both (A) and R are not correct
D. (A) is correct but( R) is not correct
Answer : Option A
Explaination / Solution:
No Explaination.


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Q.7

Assertion (A): Oxygen plays a key role in the troposphere

Reason (R): Troposphere is not responsible for all biological activities

A. Both (A) and R are correct and (R) is the correct explanation of (A)
B. Both (A) and R are correct and (R) is not the correct explanation of (A)
C. Both (A) and R are not correct
D. (A) is correct but( R) is not correct
Answer : Option D
Explaination / Solution:
No Explaination.


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