C. Methane gas<\/strong><\/p>\nA safety lamp is a type of lamp that is designed to be used in hazardous environments, such as mines and tunnels. It is equipped with a special flame that will not ignite flammable gases, such as methane. If a safety lamp causes flames when inserted in the upper portion of a manhole, it indicates that there is a high concentration of methane gas in the air. This is a dangerous situation, as methane gas can cause explosions.<\/p>\n
Carbon dioxide gas is not flammable, so it would not cause a safety lamp to produce flames. Hydrogen sulfide gas is also not flammable, but it is poisonous. If a safety lamp was exposed to hydrogen sulfide gas, the flame would be extinguished. Petrol vapours are flammable, but they would not cause a safety lamp to produce flames unless the lamp was very close to the vapours.<\/p>\n
In conclusion, the correct answer is: C. Methane gas<\/strong>.<\/p>\n","protected":false},"excerpt":{"rendered":"[amp_mcq option1=”Carbondioxide gas” option2=”Hydrogen sulphide gas” option3=”Methane gas” option4=”Petrol vapours” correct=”option3″]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[650],"tags":[],"class_list":["post-7758","post","type-post","status-publish","format-standard","hentry","category-waste-water-engineering","no-featured-image-padding"],"yoast_head":"\n
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