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Some words (underlined) in the following sentences are jumbled up. Write them in their correct form.
(a) Seldie is a combustible substance.
(b) Slaas is a non-combustible material.
(c) Chittsmack does not burn by itself.
(d) Some substances on combustion produce thea and mafel.
(e) The amount of heat energy produced on complete combustion of 1 kg of a fuel is called its ficalroic value.
(a) Diesel is a combustible substance.
(b) Glass is a non-combustible material.
(c) Matchstick does not burn by itself.
(d) Some substances on combustion produce heat and flame.
(e) The amount of heat energy produced on complete combustion of 1 kg of a fuel is called its calorific value.
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- Differentiate between combustible and non-combustible substances. Write two examples of each .
- Fill in the blanks with suitable words:(a) A fuel must be heated to its……… before it starts burning.(b) The most common supporter of combustion around us is……………..(c) Fire produced by burning oil cannot be controlled by…………………….(d) A liquid fuel used in homes is………(e) The amount of heat evolved when 1kg of a fuel is burnt completely is called its…………………..(f) The substance which vaporize during, give…………………..(g) Burning of wood and coal causes……………. of air.
- You are given three substances A, B and C. How will you find out which of them as a combustible material?
- In which zone of a candle flame:(a) partial combustion of fuel takes places, and(b) complete combustion of fuel takes place?
- Distinguish between combustible and non-combustible substances.
- Fill in the following blank with a suitable word:The amount of heat produced by burning a unit mass of a fuel completely is known as its __________ value.
- A list of jumbled words is given here. Write the correct form of each word.(a) WASHFERRET(b) CHARREGE(c) QUIFERA(d) WOSN
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