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Question 11 Mark

Fill in the following blanks with suitable words: The amount of heat evolved when $1kg$ of a fuel is burnt completely is called its $............$

Answer

The amount of heat evolved when $1kg$ of a fuel is burnt completely is called its calorific value.

Question 21 Mark

Fill in the following blanks with suitable words: A fuel must be heated to its $............$ before it starts burning.

Answer

A fuel must be heated to its ignition temperature before it starts burning.

Question 31 Mark

Fill in the following blanks with suitable words: A liquid fuel used in homes is $............$

Answer

A liquid fuel used in homes is kerosene.

Question 41 Mark

Fill in the following blanks with suitable words: The substances which vaporise during burning, give $............$

Answer

The substances which vaporise during burning, give flames.

Question 51 Mark

Fill in the following blanks with suitable words: The most common supporter of combustion around us is $............$

Answer

The most common supporter of combustion around us is air.

Question 61 Mark

Fill in the following blanks with suitable words: Burning of wood and coal causes $............$ of air.

Answer

Burning of wood and coal causes pollution of air.

Question 71 Mark

Fill in the following blanks with suitable words: Fire produced by burning oil cannot be controlled by $............$

Answer

Fire produced by burning oil cannot be controlled by water.

Science Fill in the blanks: [1 M]