FILL IN THE BLANKS:
STATE THE FOLLOWING AS TRUE OR FALSE:
- The burning of substance takes place when oxygen is present then it is called __________.
- Substances that don’t catch fire in the presence of oxygen are called____________.
- The minimum temperature required by any substance to catch fire or burn is called________.
- The flame of Bunsen burner becomes blue due to the sufficient supply of_________.
- __________ and__________ substances are examples of the explosion.
UNSCRAMBLE THE FOLLOWING WORDS:
- Burning of fossil fuels release eco-friendly gases in the atmosphere.
- Primary fuels found same as they appear in the nature.
- The outermost zone is the least hot zone.
- Combustion of fuels releases oxygen in the air.
- Inhalation of lead compounds can cause cancer.
CHOOSE THE CORRECT OPTION:
(a) In non-luminous zone, the wax vapours burn in the presence of________.
(b) What do we call the innermost zone or zone of no combustion?
- Combustion Zone
- Luminous Zone
- Dark Zone
- Inflammable Area
(c) Which of the following is the hottest zone?
- Middle Zone
- Outermost Zone
- Innermost Zone
- All of these
(d) Which type of fuels leave residue or ash after combustion?
- Solid fuels
- Liquid fuels
- Gaseous fuels
- None of these
(e) What do we call the fuels that are present in a finite amount?
- Renewable fuels
- Non-renewable fuels
- Luminous fuels
- Non-luminous fuels
Name of the following:
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- Substances that burn easily in the presence of oxygen.
- Any object or material that helps to complete the process of combustion.
- The minimum temperature required by any substance to burn or catch fire.
- Low ignition substances that catch fire easily.
- Burning of any substance rapidly that releases a large amount of heat.
- Combustion of fuel takes place completely in the presence of sufficient amount of oxygen.
- A region where the combustion takes place.
- Some fuels that are present in the form of liquid in the room temperature.
- The SI unit of Calorific value of a fuel.
- It is a highly poisonous gas that produces carboxyhaemoglobin when it mixes with the haemoglobin.
- NCERT Solution
Class 8 Maths
Class 8 Science