Q&A -Ask Doubts and Get AnswersPrevious Next
Combustion and Flame
(a) Water is not used to control fires involving electrical equipment.
(b) LPG is a better domestic fuel than wood.
(c) Paper by itself catches fire easily whereas a piece of paper wrapped around an aluminium pipe does not.
(a) We should not use water when electrical equipment is on fire as water may conduct electricity and give a shock to people dousing the fire. For fires involving electrical equipment and inflammable materials like petrol, carbon dioxide (CO2) is the best extinguisher. Hence, water is not used to control fires involving electrical equipment.
(b) LPG or Liquid petroleum gas is a liquid fuel that produces no smoke on burning. Its calorific value is 55000 kJ/kg and hence does not cause pollution on combustion. While wood is a solid fuel that causes smoke and ash on burning, It has a low calorific value (17000-22000 kJ/kg) and hence causes pollution on burning. LPG can be stored in containers and can easily be transported. Hence, LPG is a better fuel than wood.
(c) The lowest temperature at which a combustible substance catches fire when heated in the air is called its ignition temperature. Paper has a low ignition temperature so, it catches fire easily. When a piece of paper is wrapped around an aluminium, it doesn't catch fire easily as aluminium absorb heat and paper does not get its ignition temperature. Hence, paper by itself catches fire easily whereas a piece of paper wrapped around an aluminium pipe does not.
Related Questions for Study
What our students and parents say about us!
Saiyam is using EduSaksham online courses from past one year. He is able to complete his tutorials, worksheets, and assignments on his own. Once he is done with worksheets, he can check his answers and if he has done any mistakes, then he can check the correct answers and explanations. They have been given so well that he is able to understand them himself and rarely he asks us for any clarification. He enjoys using the platform and has learned and improved a lot in Mathematics. I would recommend EduSaksham to all parents who want their kids to learn in a structured way and also enjoy the learning process.
Neeraj (Saiyam's Father)
I would like to thank Edusaksham on behalf of my son Aditya who attended " Math Olympiad crash course for 5 weeks". As per Aditya, this course helped him to understand new topics like Roman numerals and decimal places which were not taught in his school till date and had a better understanding of other topics. I personally thank EduSaksham for all the help and support.
Geeta Bansal (Aditya's Mother)
We had a good experience with EduSaksham. Because sheets are available online, Vedant enjoyed doing more and more sheets without any reminders. I could leave him on his own as he was very much motivated to cover the topics. Practice is very important in maths but it becomes difficult for us to prepare sheets, I am glad we found EduSaksham where in a lot of in a lot of sheets are available for practice and the quality of questions are also good. As it's a venture from IITians we could think of giving it a try and I am glad we tried
Shikha Chowdhary (Vedant's Mother)
I have grown up in a family where my father used to give me practice maths paper every day which I need to finish before I go to play. I think that strong foundation of solving new questions every day helped me to clear my IITJEE exam. But as working women, I always had time challenge to create practice Math papers for my daughter. Thanks to EduSaksham, their questions are so logical and conceptual that I don't feel the guilt of not creating practice questions by myself :). There are plenty of worksheet along with the tutorials for each chapter. It has made parents life easier :) And the best part is my daughter loves doing it. Thank you EduSaksham.