Question 1 :
Why electrical equipment on burning do not extinguished fire by water? 

Question 6 :
Air is necessary for burning as it supplies oxygen which is essential for burning.

Question 7 :
The holes are kept below the chimney of an oil lamp:

Question 11 :
When a certain amount of octane ${{\text{C}}_{\text{8}}}{{\text{H}}_{{\text{15}}}}$ is burnt completely, $ 7.04\ g CO_2$ is formed. What is the mass of ${{\text{H}}_{\text{2}}}{\text{O}}$ formed, simultaneously?

Question 15 :
When a burning candle is covered with a glass it extinguishes because:

Question 16 :
Match column 'A' with column 'B' as regard to characteristics of a flame and its zones.<table class="wysiwyg-table"><tbody><tr><td>'A'</td><td>'B'</td></tr><tr><td>a. Dark inner zone</td><td>1. Hottest part (No carbon)</td></tr><tr><td>b. Blue zone</td><td>2. Partial decomposition</td></tr><tr><td>c. Luminous zone</td><td>3. Unburnt vapours of wax</td></tr><tr><td>d. Non-luminous zone</td><td>4. Complete combustion</td></tr></tbody></table>

Question 17 :
The flame of the candle has three zones. The outer zone is blue, the middle zone is yellow and the inner zone is black. Which is correct regarding this?

Question 20 :
In foam type fire extinguisher _______ is responsible to put off fire.