Related Questions

Which one of the following resists hydrogen sulphide corrosion?
A R.C.C.
B Glazed stone wares
C Asbestos cement
D Glazed ware
β-rays emission in radioactive disintegration is always accompanied by the emission of
A γ-rays
B α-rays
C Neutrons
D None of these
হাইড্রোজেন পরমাণুর আদি শক্তিস্তর ni থেকে চূড়ান্ত শক্তিস্তর nf - এ স্থানান্তরের ফলে নিম্নলিখিত কোনটির ক্ষেত্রে সর্বাধিক শক্তি নির্গত হয়? (Which of the following transitions from an initial state ni to a final state nf in a hydrogen atom results in the most energy emission?)
A ni=80, nf=2
B ni=1, nf=2
C ni=3, nf=90
D ni=2 , nf=1
The main pollutant in waste water discharged from a petroleum refinery is oil (both in free and emulsified form). Free oil is removed by
A Biological oxygen pond
B Aerated lagoons
C Trickling filters
D Gravity separator having oil skimming devices
Main pollutant present in automobile exhaust is
A CO
B CO2
C NO
D Hydrocarbons
The alloying element which reduces the formation of iron sulphide in steel is
A Chromium
B Nickel
C Vanadium
D Manganese
The product (s) of roasting of a sulphide ore is (are)
A Oxide only
B Sulphate only
C Oxide and sulphate
D Dependent on temperature and partial pressure of oxygen & sulphur dioxide
Which of the following metals can not be extracted by pyrometallurgical process from its sulphide ore?
A Copper
B Mercury
C Lead
D None of these
Concentration of sulphide ores is done usually by
A Roasting
B Smelting
C Froth floatation
D Electro magnetic separation
There is practically no alternative/competitor to __________ in the beneficiation treatment of sulphide ores.
A Classification
B Tabling
C Jigging
D Froth floatation

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