Write true or False,also correct the false one.
a.)A physical process in which a substance reacts with oxygen to give off heat is called combustion.
b.)Water is the best extinguisher for fires involving electrical equipments.
c.)Alcohol, CNG and LPG are inflammable substances.
d.) Increased concentration of nitrogen in air is believed to cause global warming.
e.)Greater the calorific value, better is the fuel.
f.)Middle zone is the hottest zone of a flame.
g.)Magnesium is non-combustible metal.
h.) Calorific value of wood is higher than that of coal.
Answers
Question:-
To write True or False for the statements given.
Also correct the false one.
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Answer:-
•Statement
a)A physical process in which a substance reacts with oxygen to give off heat is called combustion.
⇢False.
Correction: It will not physical process. The chemical process in which a substance reacts without oxygen and give of heat.This process is called combustion.
________________________________
•Statement
b)Water is the best extinguisher for fires involving electrical equipments.
⇢False.
Correction: No,water is not the best extinguisher for fires as if water get involved with electricity it can give shocks.
Thus, carbon dioxide is the best extinguisher for fires.
________________________________
•Statement
c)Alcohol, CNG and LPG are inflammable substances.
⇢True.
________________________________
•Statement
d)Increased concentration of nitrogen in air is believed to cause global warming.
⇢False.
Correction: This is incorrect because nitrogen gas is trusted as to cause global warming if it's concentration is increased.
________________________________
•Statement
e)Greater the calorific value, better is the fuel.
⇢True.
________________________________
•Statement
f)Middle zone is the hottest zone of a flame.
⇢False.
Correction: Middle zone is moderately hot. Hence, the most hottest zone is Outer of the flame.
________________________________
•Statement
g)Magnesium is non-combustible metal.
⇢False.
Correction: Magnesium is said to be the combustible metal.
________________________________
•Statement
h)Calorific value of wood is higher than that of coal.
⇢False.
Correction: The calorific value of coal is higher than wood.
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Hope it's helpful !
Answer:
a) false -A chemical process in which a substance reacts with oxygen to give off heat is called combustion.
b) false -co^2 is the best extinguisher for fires involving electrical equipments
c) true
d)true
e) true
f) true
g)true
h) false- Calorific value of coal is higher than that of wood.