Fire Extinguisher

Q. Fire caused due kerosene oil can be extinguished by spraying water.

1. True
2. False

Q.

Which of the following substance can be used to make a fire extinguisher?

1. Common salt

2. Bleaching powder

3. Baking soda

4. Washing soda

Q.

$C{O}_2$ extinguishers help extinguish fires by

1. Cutting the supply of oxygen.

2. Reducing the heat of surroundings.

3. Limiting the supply of fuel.

4. Cutting supply of nitrogen.

Q.

What will you do, if the domestic gas cylinder bursts?

Q. Question 22
Indicate whether the following statements are true or false. Also write the false statements in their correct form.
(a) Air is necessary for combustion.
(b) Magnesium is a non-combustible metal.
(c) Carbon dioxide is an excellent fire extinguisher.
(d) Calorific value of wood is higher than that of coal

Q.

How does dumping water on fire extinguishes it?

1. Water cools the burning fuel below the ignition point

2. Water supports fire

3. Water cuts the supply of oxygen

4. Water cuts the supply of oxygen and water cools the burning fuel below the ignition point

Q. A fire extinguisher contains sodium bicarbonate and acid.

1. True
2. False

Q.

What is the common name of ${\mathrm{Na}}_2{\mathrm{CO}}_3.10{\mathrm{H}}_2\mathrm{O}$? Name two uses of the compound.

Q.

23) Which among the following is a detergent.

1. sodium stearate

2. sodium chloride

3. sodium carbonate

4. sodium lauryl sulfate

Q. Atmospheric air has 78 % $N_2$; 21% $O_2$; 0.9 % Ar and 0.1 % $C{O}_2$, by volume. What is the molecular mass of air in the atmosphere?

Q. State whether true or false:
There two types of salts of $C{O}_2$

1. True
2. False

Q.

$C{O}_2$ extinguishers have ____________ as raw materials.

1. Sodium Bicabonate

2. Potassium Bicarbonate

3. Potassium Bicarbonate and Sodium Bicabonate

4. Nitrogen

Q.

Write the product of the reaction

$\mathrm{CO}+2{\mathrm{H}}_2\to \cdots \cdots$

Q. The synonym of the word underlined at [4] is __________.

1. Filling
2. Satisfying
3. Extinguishing
4. Wetting

Q.

23) Which among the following is a detergent.

1. sodium stearate

2. sodium chloride

3. sodium carbonate

4. sodium lauryl sulfate