Select Board & Class
WHAT IS THE FULL FORM OF CNG AND LPG ?????????
list out 10 combustible materials and 10 non combustible materials
What is the difference between burning of coal and burning of candle ?
What is S.I unit of calorific value?
why hydrogen not used as a fuel ?
Is rusting of iron a combustion process ?
what is ideal fuel?
Q88)Name and give chemical equations to show the products of the combustion reation in:
a)a limited supply of air
b)sufficient supply of air
WHY DO WE WRAP A BLANKET AROUND A PERSON WHOSE CLOTHES CAUGHT FIRE
ALL COMBUSTIBLE SUBSTANCES ARE NOT FUELS. WHY?
What is rapid combustion?Give examples.
The blue zone in a candle flame is blue in colour due to complete combustion. Complete combustion takes place in invisible (non-luminous) zone also. Instead of becoming blue in colour, why is it invisible to us?
how is cough formed in our body?????
WHAT PROBLEM WILL ARISE IF A FUEL HAS AN IGNITION TEMPERATURE LOWER THAN THE AVERAGE ROOM TEMPERATURE ? NAME THE TYPE OF COMBUSTIONWILL OCCUR IN THIS CASE
list some characteristics of an ideal feul?
Only gases burn with a flame. But when you burn wood, it initially burns with a flame. Later, it only glows without a flame. Why?
how many types of combustion are there explain them
difference between rapid combustion , spontaneous combustion and explosion
distinguish between combustible and non combustible substances ,giving three examples of each
what is the difference between combustible and inflammable substances?
all combustible substance are not fuel. Why??
When a hydrocarbon fuel is burnt, it always gives out carbon dioxide and water vapour. Do you agree? Give reasons.
why do you have to use paper or kerosene oil to start fire in wood or coal
some judicious use of fossil fuels.
What is the difference between Spontaneous, rapid and explosion type of combustion
what is ideal fuel.
What are inert gases?give some examples?
name two solid fuels,two liquid fuels and two gasious fuel
Why does a goldsmith blow the outermost zone of a flame with metallic blowpipe for melting gold and silver?
what's the advantage of fish having a streamlined body ?
A better fuel leaves __________ (more/less) residue after combusion.
give 3 conditions which are necessary for combustion?
An ideal fuel has .......... calorific value .
Green leaves do not burn easily while dry leaves catch fire easily.Explain.
Suppose you are asked to boil a given quantiity of water using cow dung cake, coal and LPG as fuels. Which fuel would you prefer? Give your reason.
Is LPG a better domestic fuel than wood and why ?
a)Which of the following fuels is expected to leave a residue upon burning.
a)coal b)petrol c)LPG
NAME ONE FUEL WHICH BURNS WITHOUT GIVING OFF WATER VAPOUR? AND WHY?
What is history of matchstick?
What is calorific value ?
WHY DOES A MATCHSTICK BURN ON RUBBING IT ON THE SIDE OF THE MATCHBOX
Are frequent forest fires types of Spontaneous combustion or rapid combustion?Because in a video of types of combustion of combustion and flames chapter it says that it is a type of spontaneous combustion.Here rapid combustion signifies that it happens in the presence of external heat whereas in spontaneous combustion no external heat is given.Isn't forest fire a type of rapid combustion because it happens because of sun's heat..Experts please answer the correct option to solve my confusion.......
WHEN THE CLOTHES OF A PERSON CATCH FIRE,HE SHOULD BE COVERED WITH A BLANKET WHY?
oxygen, nitrogen, carbondioxide, carbon monoxide--------which is odd one out and why
why is hydrogen not used as fuel though it has highest calorific value?
DIFFERENTIATE BETWEEN SLOW COMBUSTION RAPID COMBUSTION SPONTANEOUS COMBUSTION AND VOLATILE COMBUSTION.
PLZ..... ANSWER IT FAST .IT S IMPORTANT.
' Gaseous fuels are better than liquids and solid fuels'. COMMENT.
Flame of burning candle goes off when we blow strongly over it. Why?
Why do forest fire occurs during hot summers?
What is tilling? What purpose does it serve?
Calorific value of cow dung cakes is 7000 J/KG. How much cow dung cakes are required to produce heat energy of 35000 J ?
please answer to this question and its chemistry, COUMBUSTION AND FLAME.
Water was poured over a large oil fire to extinguish it. What would happen and why?
can the process of rusting be called combustion need answer with explanation and if possible give some examples but explation is important
are yaar my teacher doesnt know the answer to this question
What are non-combustible substances? Explain with examples.
why should water not be used to put off fire caused by burning of petrol?
WHY CARBON DIOXIDE IS CONSIDERED AS THE BEST FIRE EXTINGUISHER?
How has the use of CNG in motor vehicles reduced pollution in big cities?Explain
Calorific value of Cowdung is 7000kg. How much cowdung cakes are required to produce heat energy of 35000 J? Explain with steps.
Matchsticks are made from 3 substance
Are they all are nonmetal?
which of them make fricition
your LPG gas stove at home is giving a yellow flame. What can this mean?
what is the difference between combustion and burning?
paper by itself catches fire easily whereas a piece of paper wrapped around an aluminium pipe does not
Candle wax and petrol both produce the same gas on heating. Why is petrol a better fuel than wax?
why is phosphorous stored in kerosene and not in water or other such liquids ?
Carbon dioxide is the most commonly used gas for extinguishing a fire. Which properties of carbon dioxide are used here ?
what precautions should be taken while using cng fuel in vehicles ? plss fasst i have just 9 hrs
why are some materials burn with flame while others without flame?
hope ans by meritnation expert
which zone of a flame does a goldsmith use for melting gold and silver and why
In which zone of the flame fuel remains in vapour form ?
Does yellow flame from a gas burner shows complete burning of the fuel ?
What is slow combustion?
Name the finely suspended particles in air, which sometimes cause explosion in coal mines.
why does the paper cup containing water not catch fire on heating ?
WHAT KIND OF FIRES CAN EFFECTIVELY BE PUT OUT BY WATER? WHAT KIND OF FIRES IS TI NOT SUITABLE FOR? GIVE REASONS FOR BOTH CASES
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