Q3 of 19 Page 143

Match the suitable renewable and non-renewable sources.


Renewable sources are those sources which can be replaced after they are used. Hydrogen, wind and solar energy all are inexhaustible and present in surplus amount. Thus they all are renewable sources of energy.


Non-renewable sources are those sources which cannot be replaced. Once they are used they are gone forever because their formation takes a very long time whereas they are consumed quickly. All fossil fuels are non-renewable sources because they are formed in a span of millions of years. Coal, natural gas, and petroleum all are fossil fuels thus they all are non-renewable sources of energy.


More from this chapter

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1

The bar-graph indicates the prevalence / widespread attack of infectious diseases in two cities A and B. Observe it and answer the questions given below:

1. Dengue fever 2. Rat fever


3. Cholera 4. Chikungunya


a. What may be the reason for the disease in city A?


b. Which city needs a more effective system of waste-disposal and cleaning?


c. How can the disease be controlled in city A?


 2

The pie diagram represents a survey result of infectious diseases in a village during

2008 – 2009. Analyse it and answer the following:



i) Which diseases affect the majority of the population?


ii) How are these diseases transmitted?


iii) Mention any three measures that can control the other two diseases.

 4

Find the odd one out:

i) bioalcohol, green diesel, brothers, petroleum


ii) cholera, typhoid, scabies, dysentery

 5

A non-renewable resource is a natural resource if it is replaced by the natural process at a rate equal to or faster than its rate of consumption by humans.

Read this statement and say whether it is correct or incorrect. If it is incorrect, give the correct statement.