Self Studies
Self Studies
Self Studies
Self Studies

Combustion and Flame Test - 19

Result Self Studies

Combustion and Flame Test - 19
  • Score

    -

    out of -
  • Rank

    -

    out of -
TIME Taken - -
Self Studies

SHARING IS CARING

If our Website helped you a little, then kindly spread our voice using Social Networks. Spread our word to your readers, friends, teachers, students & all those close ones who deserve to know what you know now.

Self Studies Self Studies
Weekly Quiz Competition
  • Question 1
    1 / -0
    Which of the following is a necessary condition for spontaneous combustion to take place?
    Solution
    No flame or spark is required to start spontaneous combustion. It is only the rise in temperature to the ignition temperature which starts combustion of material producing heat and light energy.
  • Question 2
    1 / -0
    The disadvantages of incomplete combustion is/are:
    Solution
    Incomplete combustion leads to the:
    • Formation of soot which is nothing but unburnt carbon which pollutes the atmosphere.
    • Formation of carbon monoxide which is a poisonous gas.
    From the above points, it is clear that the correct answer is option $$D$$.
  • Question 3
    1 / -0
    When wood is used as fuel in chulhahs, gaps are left in between the logs of wood. This is done for _________.
    Solution
    The gaps are left in between the logs of wood because the gaps allow air (supporter of combustion) to freely come in contact with wood and hence combustion continues.
  • Question 4
    1 / -0
    When water is poured over burning wood, the fire goes off. This is because _________.
    Solution
    Water, when poured over fire absorbs a large amount of heat and hence the temperature of wood falls below the ignition temperature. Thus the fire goes off.
    So, the correct answer is option A.
  • Question 5
    1 / -0
    Inflammable substances have a __________ ignition temperature.
    Solution
    The lowest temperature at which a substance catches fire and undergoes combustion liberating heat and light is called the ignition temperature. Inflammable substances have low ignition temperatures and, so they easily catch fire.
  • Question 6
    1 / -0
    Fire involving electrical equipment can be extinguished by using __________.
    Solution
    In case of fires that involve electrical equipment and inflammable materials, carbon dioxide ($$CO_2$$) is used as extinguisher. It is heavier than oxygen and covers the fire like a blanket. This way, the contact between the fuel and oxygen is cut off, and the fire is controlled. Moreover, carbon dioxide does not harm the electrical equipment.

  • Question 7
    1 / -0
    Which of the following is an excellent fuel?
    Solution
    Out of three different types of fuels, gaseous fuel is excellent fuel because it is are easier to handle than solid and liquid fuels. It is easily transported through pipelines. They do not leave a residue after burning. Gaseous fuels produce low smoke and have high calorific value, they have relatively low ignition temperature and produce more heat.
    Hence, option C is correct.
  • Question 8
    1 / -0
    In which zone of a candle flame does complete combustion take place?
    Solution
    Outer Zone: This zone is blue in colour. It is the hottest part of the flame, because complete combustion takes place in this zone
  • Question 9
    1 / -0
    The head of a safety match contains:
    Solution
    The heads of safety match contains Antimony trisulphide, potassium chlorate,sulphur ,powdered glass,inert filters and animal glue.
    Antimony trisulphide cannot be ignited directly by the heat of friction,even in the presence of oxidizing agent like potassium chlorate and it requires another source of ignition to start the combustion.
    That source of ignition comes from the striking surface,which is deposited on the side of the matchbox or on the back cover of the matchbox.
    The striking surface contains red phosphorus, powder glass and glue.
    When a safety match is rubbed against the striking surface, the friction generates enough to convert a trace of the red phosphorus into white phosphorus.
    This is immediately react with potassium chlorate in the match head to produce enough heat to ignite the Antimony tri sulphide and start the combustion.
     
  • Question 10
    1 / -0
    The process of burning a substance in the presence of air with the evolution of heat is called as __________.
    Solution

    The process of burning a substance in the presence of air with the evolution of heat is called combustion.
    Option $$\text{C}$$ is correct.
Self Studies
User
Question Analysis

  • Correct -

  • Wrong -

  • Skipped -

My Perfomance
  • Score

    -

    out of -
  • Rank

    -

    out of -
Re-Attempt Weekly Quiz Competition
Self Studies Get latest Exam Updates
& Study Material Alerts!
No, Thanks
Self Studies
Click on Allow to receive notifications
Allow Notification
Self Studies
Self Studies Self Studies
To enable notifications follow this 2 steps:
  • First Click on Secure Icon Self Studies
  • Second click on the toggle icon
Allow Notification
Get latest Exam Updates & FREE Study Material Alerts!
Self Studies ×
Open Now