Which one of the following changes may occur due to
desertification?
(a) Decrease in atmospheric temperature.
(b) Increase in water holding capacity of soil.
(c) Increased chances of floods.
(d) Conversion of fertile land into a desert.
Wild buffalo is an endangered species because
(a) its population is diminishing
(b) it has become extinct
(c) it is found exclusively in a particular area
(d) its poaching is strictly prohibited
Forest fire produces a lot of air pollution. Write in brief about the reasons of forest fires.
Although wood has a very high calorific value, we still discourage its use as a fuel. Explain.
The calorific values of petrol and CNG are 45000 kJ/kg and
50,000 kJ/kg, respectively. If you have vehicle which can run on
petrol as well as CNG, which fuel will you prefer and why?
Give two examples each for a solid, liquid and gaseous fuel along with some important uses
What are the three essential requirements to produce fire? How
fire extinguisher is useful for controlling the fire.
Manu was heating oil to fry potato chips. The cooking oil all of a
sudden caught fire; he poured water to extinguish the fire. Do
you think this action was suitable. If yes, why? If not, why not?
In such a condition what should Manu have done?
You are provided with three watch glasses containing milk, petrol
and mustard oil, respectively. Suppose you bring a burning candle
near these materials one by one, which material(s) will catch fire
instantly and why?
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