Select Board & Class
WHAT IS THE FULL FORM OF CNG AND LPG ?????????
WHY DO WE WRAP A BLANKET AROUND A PERSON WHOSE CLOTHES CAUGHT FIRE
list out 10 combustible materials and 10 non combustible materials
What is S.I unit of calorific value?
What is the difference between burning of coal and burning of candle ?
why hydrogen not used as a fuel ?
difference between rapid combustion , spontaneous combustion and explosion
Is rusting of iron a combustion process ?
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?
what is ideal fuel?
What is rapid combustion?Give examples.
why do you have to use paper or kerosene oil to start fire in wood or coal
how is cough formed in our body?????
What is the difference between Spontaneous, rapid and explosion type of combustion
list some characteristics of an ideal feul?
a)Which of the following fuels is expected to leave a residue upon burning.
a)coal b)petrol c)LPG
how many types of combustion are there explain them
why is phosphorous stored in kerosene and not in water or other such liquids ?
distinguish between combustible and non combustible substances ,giving three examples of each
Matchsticks are made from 3 substance
Are they all are nonmetal?
which of them make fricition
all combustible substance are not fuel. Why??
oxygen, nitrogen, carbondioxide, carbon monoxide--------which is odd one out 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
some judicious use of fossil fuels.
why are some materials burn with flame while others without flame?
hope ans by meritnation expert
what is ideal fuel.
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?
What are inert gases?give some examples?
Why does a goldsmith blow the outermost zone of a flame with metallic blowpipe for melting gold and silver?
ALL COMBUSTIBLE SUBSTANCES ARE NOT FUELS. WHY?
what's the advantage of fish having a streamlined body ?
give 3 conditions which are necessary for combustion?
Flame of burning candle goes off when we blow strongly over it. Why?
Green leaves do not burn easily while dry leaves catch fire easily.Explain.
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.
Is LPG a better domestic fuel than wood and why ?
NAME ONE FUEL WHICH BURNS WITHOUT GIVING OFF WATER VAPOUR? AND WHY?
WHY CARBON DIOXIDE IS CONSIDERED AS THE BEST FIRE EXTINGUISHER?
What is calorific value ?
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
WHY DOES A MATCHSTICK BURN ON RUBBING IT ON THE SIDE OF THE MATCHBOX
To set fire to a combustible substance, you have to heat it to a certain minimum temperature. What is this minimum temperature called ? If this minimum temperature is very low for a certain substance, what is the substance called ?
WHEN THE CLOTHES OF A PERSON CATCH FIRE,HE SHOULD BE COVERED WITH A BLANKET WHY?
why does the paper cup containing water not catch fire on heating ?
why is hydrogen not used as fuel though it has highest calorific value?
Write an Activity - To study Ignition Temperature Using Paper Cup .
' Gaseous fuels are better than liquids and solid fuels'. COMMENT.
name two solid fuels,two liquid fuels and two gasious fuel
Why do forest fire occurs during hot summers?
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
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.
When a hydrocarbon fuel is burnt, it always gives out carbon dioxide and water vapour. Do you agree? Give reasons.
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?
WHEN A CANDLE BURNS ,IS IT POSSIBLE TO GET THE WAX BACK
A) AFTER THE WAX MELTS
B) AFTER THE WAX BURNS
what is the difference between combustion and burning?
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????????
paper by itself catches fire easily whereas a piece of paper wrapped around an aluminium pipe does not
What is history of matchstick?
what precautions should be taken while using cng fuel in vehicles ? plss fasst i have just 9 hrs
what is combustion
which zone of a flame does a goldsmith use for melting gold and silver and why
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.
What is tilling? What purpose does it serve?
What is slow combustion?
Copyright © 2021 Applect Learning Systems Pvt. Ltd. All rights reserved.
E.g: 9876543210, 01112345678
We will give you a call shortly, Thank You
Office hours: 9:00 am to 9:00 pm IST (7 days a week)