Combustion and Flame

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(1) A chemical process in which a substance reacts with oxygen to give off heat is called

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a) Combustion

(b) Oxidation

d) Non of these

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2) Substance give heat and light after combustion is called

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(a) Flame

(b) Fuel

(d) None of these

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3) Ignition temperature is called ----

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(a) Lowest temperature at catch fire

(b) Higher temperature at catch fire

(d) None of these

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4) The products of combustion are

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a. Carbon dioxide and water

b. Oxygen and water

c. Only carbon dioxide

d. Only oxygen

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5) Combustion process is a

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(a) Chemical process

(b) Physical process

(d) None of these

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6) Which one of the following gases is used in combustion?

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(a) Hydrogen

(b) Oxygen

(d) Carbon dioxide

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7) --------Substances catches fire

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a) acidic

(b) basic

(d) non combustible

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(8) What is the main chemical component present in striking surface of a matchbox?

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A. Potassium chlorate

B. Phosphorus

C. Potassium

D. Graphite

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(9) The SI unit of the calorific value of a fuel is

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A. N/kg

B. KJ/kg

C. KW/kg

D. J/kg

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10) The colour of outer zone of candle flame is _______

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A. orange

B. blue

C. red

D. yellow

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