Combustion

Which of the following is not true about a soda-acid type fire extinguisher?

• This type of extinguisher is not used for controlling fire caused by electrical means or inflammable liquids

• There is an evolution of Sodium Sulfate, Carbon dioxide and Water

• The fire gets controlled as CO2 expands enormously in volume and cools down

• On striking the fire extinguisher against a hard surface, the glass bottle breaks and mixes with Sodium Carbonate

Assertion and Reasoning

A- Substances with low ignition temperature are called flammable substances.

R- Sodium Metal is an example of spontaneous combustion.

• A is true and R is the correct explanation for A

• A is false and R is True

• A is true and R is False

• A is true and R is not the correct explanation for A

Which of the following the conditions may be necessary for combustion?

• The presence of a combustible substance

• A continuous supply of Oxygen

• Temperature should be above the Kindling Temperature

• Presence of a flammable substance

Which type of fire extinguisher should be used on a fire involving flammable liquids such as grease or oil?

• $H_2O$

• $CO$

• $CO_2$

• $Dry\ Chemical$

Which of the following term(s) is/are similar to combustion?

• Fire Triangle

• Auto Ignition

• Burning

• Kindling Temperature

Assertion and Reasoning

A- The combustion rate of fuels can be easily controlled.

R- The combustion of gaseous fuels can be easily controlled with the help of a control valve.

• A is true and R is false

• Both A and R are false

• A is true and R is the correct explanation of A

• None of these

• A is false and R is true

Burning of charcoal in room will produce

• $CO_2$

• $CO$

• Carbon Monoxide

• All of these

Which zone represent the partial combustion in a candle flame?

• A

• C

• B

Bursting of crackers is an example of-

• Rapid combustion

• Spontaneous combustion

• Combustion

• Explosive combustion

Which part of a flame does a goldsmith blow for melting gold and silver?