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Question
Fill in the blanks.
(a) Burning of wood and coal causes ______ of air.
(b) A liquid fuel, used in homes is ______.
(c) Fuel must be heated to its ______ ______ before it starts burning.
(d) Fire produced by oil cannot be controlled by ______.
(a) Burning of wood and coal causes ______ of air.
(b) A liquid fuel, used in homes is ______.
(c) Fuel must be heated to its ______ ______ before it starts burning.
(d) Fire produced by oil cannot be controlled by ______.
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Solution
(a) The burning of wood and coal causes pollution of air.
That is, burning of wood and coal gives a lot of smoke. This can cause air pollution.
(b) A liquid fuel used in homes is kerosene.
Kerosene is a fossil fuel derived from petroleum.
(c) Fuel must be heated to its ignition temperature before it starts burning.
The lowest temperature at which a substance catches fire is called its ignition temperature.
(d) The fire produced by oil cannot be controlled by water.
Water is heavier than oil. Hence, it
sinks below the oil, and oil keeps burning on the top. Therefore, water cannot be used to extinguish fire produced by oil.
That is, burning of wood and coal gives a lot of smoke. This can cause air pollution.
(b) A liquid fuel used in homes is kerosene.
Kerosene is a fossil fuel derived from petroleum.
(c) Fuel must be heated to its ignition temperature before it starts burning.
The lowest temperature at which a substance catches fire is called its ignition temperature.
(d) The fire produced by oil cannot be controlled by water.
Water is heavier than oil. Hence, it
sinks below the oil, and oil keeps burning on the top. Therefore, water cannot be used to extinguish fire produced by oil.
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