Fire Control

Q. When substance X burns in air, it produces oxide Y that turns a moist blue litmus paper red. Which of the following observations regarding Y is incorrect?

1. Y is an acidic oxide.​
2. Y turns China rose indicator dark pink.
3. Y turns turmeric indicator red.
4. Y reacts with a basic solution to produce salt and water.

Q. Which of the following cannot be used to extinguish the fire caused by electricity?

1. Sand
2. Carbon dioxide
3. Blanket
4. Water

Q.

Give reason: Water is not used to control fires involving electrical equipment.

Q.

Give the importance of water in fire fighting.

Q. A substance that turns moist strach iodide paper blue is:

1. chlorine
2. sulphur dioxide
3. ammonia
4. hydrogen sulphide

Q.

Which of the following arrangement represents the fire triangle?

1. Hydrogen, Fuel and Light.

2. Oxygen, Fuel and Wood.

3. Oxygen, Fuel and Heat.

4. Hydrogen, Oxygen and Light.

Q. Water should never be used to extinguish oil fires. Which option provides the best justification for this statement?

1. Water is lighter than oil and on spraying water it sinks and oil floats and the fire continues.
2. Water reacts with oil and forms a new flammable compound.
3. Water is heavier than oil and on spraying water it sinks and oil floats, and the fire continues.
4. Oil fire is very intense converting water into steam and evaporating it.