21. Persons working in cement plants and lime stone quarries are prone to disease like

1. 1. Cancer

   
   
   

   2. asthma

   
   
   

   3. silicosis

   
   
   

   4. pneumoconiosis

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: C

   NA

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22. Man dies in the atmosphere of CO, because it

1. 1. dries up the blood

   
   
   

   2. combines with O₂ present in the body

   
   
   

   3. reduces the organic matter of tissues

   
   
   

   4. combines with the haemoglobin of blood, thereby making the later incapable of absorbing O₂

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: D

   NA

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23. Lead in water can cause

1. 1. eye disease

   
   
   

   2. arthritis

   
   
   

   3. kidney damage

   
   
   

   4. hair falling

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: C

   NA

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24. It is dangerous to leave the car engine running in a closed garage, because it may cause serious pollution due to poisoning by emission of

1. 1. CO₂

   
   
   

   2. CO

   
   
   

   3. unburnt petrol

   
   
   

   4. SO₂

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: B

   NA

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25. Match the List-I with List-II and select the correct answer using the codes given below the lists
    

    	List-I (Green house gas)		List-II(Major source)
    F.	Carbondioxide	1.	Enteric fermentation in cattle
    G.	Methane	2.	Burning of fossil
    H.	Chloroflro carbons	3.	Mercury compounds in waste water
    J.	Nitrous oxide	4.	Nylon production
    		5.	Air conditioner and refrigeration units

    Codes :

    	F	G	H	J
    A.	2	1	5	4
    B.	3	4	2	1
    C.	3	2	4	1
    D.	1	2	3	4

1. 1. A.

   
   
   

   2. B.

   
   
   

   3. C.

   
   
   

   4. D.

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: A

   NA

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