Give reasons for the following:
1. A circular blackish ring is formed on a glass slide kept above the yellow zone of flame.
2. You are advised not to sleep in a closed room with burning or smoldering coal fire in it.
3. Wood shavings burn easier than a log of wood.
4. Cooking oil catches fire when a frying pan is kept on the stove for a long time.
5. We need to take special care in storing kerosene oil as compared to storing wood.
Answers
Explanation:
Students find out the answer of days very short questions and write in your fair notebook.
Q1. which mountains are young and structurally fold mountains?
Q2. What is the total length of Himalayas?
Q3. What is the width of Himalayas?
Q4. What name is given to the northern Himalayas?
Q5.Which is the highest mountain peak in the world?
Q6. The core of Himalaya is composed of what?
Q7. What is the another name of lesser Himalaya?
Q8. Which region of Himalaya is well known for hill station?
Q9. the outermost range of Himalaya is known as what?
Q10. Name the areas on the basis of which Himalaya is divided from west to east?
Q11. Which area of Himalaya is known as Purvanchal?
Q12. What is the total area of Northern plains?
Q13. What is the meaning of word Doab?
Q14. Name the largest riverine island in Brahmaputra river?
Q15. What is bhabar?
Q16. What is Bhangar?
Q17. What is Khadar?
Q18. What are the two major parts of peninsular plateau?
Q19. Which is the highest peak of eastern Ghat?
Q20. Which is the highest peak of Western Ghat?
Q21. Name the only large river flows in Indian desert?
Q22. What are barchans?
Q23. Which is the largest saltwater lake in India?
Q24. Which group of island is known as coral island?
Q25. Where is India's only active volcano situated?ljDJ zdx DJ xtc DJ dazs DJ dts tis6is6s5isitaiyditsyoau rut tusd otaad yisd yp
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→ A circular blackish ring is formed on the glass plate/slide. It indicates the deposition of unburnt carbon particles present in the luminous zone of the flame.
→ Incomplete combustion of coal releases many poisonous gases like carbon monoxide in the environment. This carbon monoxide gas is fatal to health, can lead to coma and even death of the persons sleeping in that room.
→ The answer is two folds. It is the nature of combustion reaction. First as the others highlighted it is due to having higher surface area for wood to catch fire. That is why wood chips catch fire relatively easier and burn faster than a wooden log.
→ Cooking oil catches fire when frying pan is kept for long on a burning stove. Oil catches fire when your cooking oil becomes too hot. When heating, oils first start to boil, then they'll start smoking, and then they'll catch on fire. Most vegetable oils have a smoking point around 450°F.
→ Kerosene oil has low ignition temperature which means they can catch fire easily compared to coal. So, to store Kerosene more care to be taken than coal.