Advertisements
Advertisements
प्रश्न
Give reasons.
Paper by itself catches fire easily whereas a piece of paper wrapped around an aluminium pipe does not.
उत्तर
A piece of paper wrapped around an aluminium pipe does not catch fire easily. This is because aluminium, being a metal, is a good conductor of heat. Therefore, heat is transferred from the paper to the metal and the paper does not attain its ignition temperature.
APPEARS IN
संबंधित प्रश्न
Combustion is a chemical reaction in which and substance react with ______.
Some words (underlined) in the following sentence is jumbled up. Write them in their correct form.
Some substances on combustion produce thea and mafel.
Some words (underlined) in the following sentence is jumbled up. Write them in their correct form.
The amount of heat energy produced on complete combustion of 1 kg of a fuel is called its ficalroic value.
Two glass jars A and B are filled with carbon dioxide and oxygen gases respectively. In each jar, a lighted candle is placed simultaneously. In which jar, will the candle remain lighted for a longer time and why?
Fill in the blanks using the words given in the box.
| ignition | petrol | combustion | calorific value | combustible | combustible |
A chemical process in which a substance reacts with oxygen to give off heat is called ______.
People usually keep angithi/burning coal in their closed rooms during winter season. Why is it advised to keep the door open?
The chemical process in which a substance reacts with oxygen to produce heat is called ______.
Give one example of slow combustion.
Fill in the blanks using the word given in the box.
| ignition | petrol | combustion | calorific value | combustible | combustible |
Wood, paper, CNG are ______ substances.
Fill in the blanks using the words given in the box.
| ignition | petrol | combustion | calorific value | combustible | combustible |
The substances which have very low ______ temperature and can easily catch fire with a flame are called ______ substances.
