Blends of polyblend and bitumen, when used, help to increase road life by a factor of three. What is the reason?
Blends of polyblend and bitumen, when used, help to increase road life by a factor of three because:
i) In India, the weather is mainly hot and extremely humid and plastic increases the melting point of bitumen and prevent it from melting.
ii) Rainwater is prevented from seeping in through the roads due the presence of plastic.
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A national newspaper reported that a 50-metre high ‘Sanitary landfill’, the dumping site of city’s garbage in one of the metro-cities crashed and caused heavy damage and disaster in and around the area. A couple of cars, two-wheelers and cattle were swept away in the nearby overflowing canal. Three persons including a young girl were crushed under the garbage and died.
(a) Write any two points that in your opinion could have caused this landfill crash.
(b) Mention any four preventive measures to be adhered to as a policy which could have avoided this accident.
(c) Write any two suggestions that you would like to give to the citizens so as to help in preventing such a disaster in future.Biology - Board Papers
Write a short note on electronic waste. List the various sources of e-wastes and the problems associated with its disposal.Biology - Exemplar
Blends of polyblend and bitumen, when used, help to increase road life by a factor of three. What is the reason?Biology - Exemplar
What is the best solution for the treatment of electronic wastes?Biology - Exemplar
What is the raw material for polyblend?Biology - Exemplar
What are the basic characteristics of a modern landfil site. List any three and also mention the reasons for their use.
Ans. Characteristics of a modern landfil include:
i. methods to contain leachate such as lining clay or plastic liners.
iii. compaction and covering of the waste to prevent it from being blown by wind.
iv. installation of a landfill gas extraction system to extract the gas for use in generation of power
Biology - Exemplar