Question

a.
C.
a.
B. Fill in the blanks.
(5x0.5=2
The lowest temperature at which a substance burns is called its
b. A material that burns is one that can combine quickly with.........
Burning is the process of rapid oxidation and is also known as
d. A ...... .............. is produced when combustible substance is in the vapour state.
e. The outermost zone of candle is ........ ................in colour and is the
.....part of the flame.
C. Write true or false for the following statements.
[5x0.5
Combustion is a chemical process in which a substance reacts to give off heat.
b. Combustion cannot take place in the sun since there is no air in the sun.
C. Usually substances catch fire at one fixed temperature.
d. The substances which have very high ignition temperature are called inflammable substances.
e. The combustion in which a substance burns rapidly and produces heat and light is called rapid combu
D. Select the odd one out giving reason.
(5x1
a. Wood, charcoal, coke, iron nails.
b. Petrol, diesel, kerosene, coke.
C. Smoke, flame, fuel, heat.
d. Natural gas, LPG, CNG, gasoline.
e. Fuel, oxygen, ignition temperature, water.​

Answer 1

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