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The gas that usually causes explosions in coal mines is
Coal mines drainage waste water (acidic in nature) results from the earth's water percolating through the voids created in coal bed during mining. This polluted water which either drains out naturally to water courses or are removed before starting the mining is
Calorific value of coal middling generated in coal washeries during washing of coal may be around __________ Kcal/kg.
Coal mines in Jharkhand are located at
The gas which may cause explosion in sewers, is
The gas that causes suffocation and death when coal or coke is burnt in a closed room is
The density of a gas 'X' is twice that of another gas 'Y'. If the molecular weight of gas 'Y' is 'M'; then the molecular weight of the gas 'X' will be
দুটি এক-পরমাণুক আদর্শ গ্যাস পরস্পরের সাথে তাপীয় সাম্যাবস্থায় আছে। A গ্যাস m ভরের অণু দ্বারা গঠিত, এবং B গ্যাস 4m ভরের অণু দ্বারা গঠিত। A গ্যাসের আয়তন ৪ গ্যাসের আয়তনের দ্বিগুণ। এদের চাপের অনুপাত PA / PB কত? (Two monoatomic ideal gases are in thermal equilibrium with each other. Gas A is composed of molecules with mass m while gas B is composed of molecules with mass 4m. The volume of gas A is twice that of gas B. What it the ratio of their pressures PA / PB ?)
In each of the following questions, find out which part of the sentence has an error. 'Hardly had I reached the airport' 'before I learnt' 'about the powerful bomb explosion ' 'No error'
Which of the following treaty is associated with nuclear test explosion?