Select Board & Class
WHAT IS THE FULL FORM OF CNG AND LPG ?????????
list out 10 combustible materials and 10 non combustible materials
What is S.I unit of calorific value?
why hydrogen not used as a fuel ?
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?
Is rusting of iron a combustion process ?
The calorific value of a fuel is 330000 kJ/kg. 0.9634 kg of the fuel is taken for combustion..
what is ideal fuel?
WHY DO WE WRAP A BLANKET AROUND A PERSON WHOSE CLOTHES CAUGHT FIRE
What is rapid combustion?Give examples.
Flame of burning candle goes off when we blow strongly over it. Why?
how is cough formed in our body?????
list some characteristics of an ideal feul?
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 burning of coal and burning of candle ?
all combustible substance are not fuel. Why??
is carbondioxide is good conductor of heat or bad conductor and if bad conductor then why it can not be used to extinguish the fire caused by electrical shot circuits and how fire brigade get control over these types of electrical fire????????
why do you have to use paper or kerosene oil to start fire in wood or coal
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
some judicious use of fossil fuels.
Why do forest fire occurs during hot summers?
what is ideal fuel.
Flame from the Bunsen burner is blue in colour while that of the candle is primarily yellow in colour.Why??
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?
The unburnt carbon particles escaping from the candle flame from the pollutants called _____________ in air.
what's the advantage of fish having a streamlined body ?
give 3 conditions which are necessary for combustion?
Matchsticks are made from 3 substance
Are they all are nonmetal?
which of them make fricition
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 ?
oxygen, nitrogen, carbondioxide, carbon monoxide--------which is odd one out and why
NAME ONE FUEL WHICH BURNS WITHOUT GIVING OFF WATER VAPOUR? AND WHY?
What is calorific value ?
WHY DOES A MATCHSTICK BURN ON RUBBING IT ON THE SIDE OF THE MATCHBOX
WHEN THE CLOTHES OF A PERSON CATCH FIRE,HE SHOULD BE COVERED WITH A BLANKET WHY?
When a hydrocarbon fuel is burnt, it always gives out carbon dioxide and water vapour. Do you agree? Give reasons.
why is hydrogen not used as fuel though it has highest calorific value?
a)Which of the following fuels is expected to leave a residue upon burning.
a)coal b)petrol c)LPG
D)CNG.
' Gaseous fuels are better than liquids and solid fuels'. COMMENT.
Water was poured over a large oil fire to extinguish it. What would happen and why?
What is the difference between luminous and non- luminous zones and what is the difference between inflammable and flammable substances ?
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?
Camphor burns with a flame. Charcoal does not. 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 is the difference between Spontaneous, rapid and explosion type of combustion
What are non-combustible substances? Explain with examples.
What is history of matchstick?
why should water not be used to put off fire caused by burning of petrol?
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.
your LPG gas stove at home is giving a yellow flame. What can this mean?
what is the difference between combustion and burning?
give reason:
paper by itself catches fire easily whereas a piece of paper wrapped around an aluminium pipe does not
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
what precautions should be taken while using cng fuel in vehicles ? plss fasst i have just 9 hrs
on what factor the calorific value of a fuel depends?
why are some materials burn with flame while others without flame?
hope ans by meritnation expert
what is combustion
which zone of a flame does a goldsmith use for melting gold and silver and why
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
What is tilling? What purpose does it serve?
What is slow combustion?
what is the difference between combustible and inflammable substances?
why does the paper cup containing water not catch fire on heating ?
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Syllabus
WHAT IS THE FULL FORM OF CNG AND LPG ?????????
list out 10 combustible materials and 10 non combustible materials
What is S.I unit of calorific value?
why hydrogen not used as a fuel ?
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?
Is rusting of iron a combustion process ?
The calorific value of a fuel is 330000 kJ/kg. 0.9634 kg of the fuel is taken for combustion..
What is the total amount of heat energy (in kJ) produced during combustion ??what is ideal fuel?
WHY DO WE WRAP A BLANKET AROUND A PERSON WHOSE CLOTHES CAUGHT FIRE
A)coal
B) wood
C)biogas
D)charcoal
What is rapid combustion?Give examples.
Flame of burning candle goes off when we blow strongly over it. Why?
how is cough formed in our body?????
list some characteristics of an ideal feul?
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 burning of coal and burning of candle ?
all combustible substance are not fuel. Why??
is carbondioxide is good conductor of heat or bad conductor and if bad conductor then why it can not be used to extinguish the fire caused by electrical shot circuits and how fire brigade get control over these types of electrical fire????????
why do you have to use paper or kerosene oil to start fire in wood or coal
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
some judicious use of fossil fuels.
Why do forest fire occurs during hot summers?
what is ideal fuel.
Flame from the Bunsen burner is blue in colour while that of the candle is primarily yellow in colour.Why??
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?
The unburnt carbon particles escaping from the candle flame from the pollutants called _____________ in air.
what's the advantage of fish having a streamlined body ?
Which of the following pairs of substances catches fire at 250 degree Celsius ?
A)q and s
B)p and r
C)r and s
D) p and q
give 3 conditions which are necessary for combustion?
Matchsticks are made from 3 substance
Are they all are nonmetal?
which of them make fricition
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 ?
oxygen, nitrogen, carbondioxide, carbon monoxide--------which is odd one out and why
NAME ONE FUEL WHICH BURNS WITHOUT GIVING OFF WATER VAPOUR? AND WHY?
What is calorific value ?
a)petrol
b)kerosene
c)coal
d)LPG
the substance having the highest calorific value is
a. LPG
B. hydrogen
c. oxygen
d. coal gas
which of the following. has the highest calorific value?
1. wood
2.dung cake
3. methane gas
4. biogas
WHY DOES A MATCHSTICK BURN ON RUBBING IT ON THE SIDE OF THE MATCHBOX
WHEN THE CLOTHES OF A PERSON CATCH FIRE,HE SHOULD BE COVERED WITH A BLANKET WHY?
When a hydrocarbon fuel is burnt, it always gives out carbon dioxide and water vapour. Do you agree? Give reasons.
why is hydrogen not used as fuel though it has highest calorific value?
a)Which of the following fuels is expected to leave a residue upon burning.
a)coal b)petrol c)LPG
D)CNG.
' Gaseous fuels are better than liquids and solid fuels'. COMMENT.
Water was poured over a large oil fire to extinguish it. What would happen and why?
What is the difference between luminous and non- luminous zones and what is the difference between inflammable and flammable substances ?
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?
Camphor burns with a flame. Charcoal does not. 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 is the difference between Spontaneous, rapid and explosion type of combustion
Q: Which of the following statements are true?
I. Yellow Flames are ideal for heating.
II. The substances whichvaporiseduring burning, gives flames.
III. Luminous Zone contains unburnt carbon particles.
IV. The non-Luminous Zone has highest temperature.
OPTIONS ARE:
What are non-combustible substances? Explain with examples.
What is history of matchstick?
why should water not be used to put off fire caused by burning of petrol?
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.
your LPG gas stove at home is giving a yellow flame. What can this mean?
what is the difference between combustion and burning?
give reason:
paper by itself catches fire easily whereas a piece of paper wrapped around an aluminium pipe does not
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
Blow out the burning candle after it has burnt for some time.Immediately bring a lighted matchstick near the smoke.What happens to stick?
What do you conclude from such an action?
what precautions should be taken while using cng fuel in vehicles ? plss fasst i have just 9 hrs
on what factor the calorific value of a fuel depends?
why are some materials burn with flame while others without flame?
hope ans by meritnation expert
what is combustion
which zone of a flame does a goldsmith use for melting gold and silver and why
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
What is tilling? What purpose does it serve?
What is slow combustion?
what is the difference between combustible and inflammable substances?
why does the paper cup containing water not catch fire on heating ?