Related Questions

A garments factory employs 3 categories of workers K, M and N. The efficiency of the 3 categories of workers to do a specific task is in the ratio of 3 : 5 : 6 respectively and the factory employs 15 of category K, 12 of category M and 3 of category N. If the total wages paid to the entire group of 30 workers is Tk. 492 per hour, what will be the wages earned by a category N worker for an 8-hour day?
A Tk. 144
B Tk. 72
C Tk. 192
D Tk. 576
Electrochemical corrosion can occur, only if __________ is present in contact with metal.
A Air
B Oxygen
C Liquid medium
D Gaseous medium
Electrochemical corrosion occurs
A Where the liquid electrolytes containing free ions are present
B Only in alloys
C Only in pure metals
D Due to direct chemical action of metal with oxygen
Though tin occurs lower than iron in the electrochemical series, yet it is coated on steel for corrosion protection, because of its
A Lower cost
B Abundant availability
C Resistance to vegetable acids as the tin plate are commercially used in 'canning' industry
D None of these
Corrosion involves exchange of electrons in __________ corrosion.
A Chemical
B Electrochemical
C Both A & B
D Neither A nor B
An electrochemical cell which is used as a source of direct electrical current at constant voltage under standard conditions is called a :
A Power transmittor
B Battery
C Uninterrupted power supply (UPS)
D Generator
Which of the following does not come under the category of 'micro-nutrient' for plant growth?
A Chlorine
B Iron
C Boron
D Carbon
Which of the following does not come under the category of 'secondary nutrient' for plant growth?
A Calcium
B Magnesium
C Sulphur
D Oxygen
Which of the following does not come under the category of'primary nutrient' for plant growth?
A Potassium
B Nitrogen
C Phosphorous
D Sulphur
Fe(s) |Fe2+ (aq) || Br2 (l) ; Br- (aq)| Pt(s) তড়িৎ রাসায়নিক কোষের সঠিক কোষ-বিক্রিয়া কোনটি? (Which one is the correct cell reaction of the given electrochemical cell?)
A Fe+Br2→Fe2++2Br-
B Fe+2Br-→Fe2++2Br2
C Fe2++Br2→Fe+2Br-
D Fe+Br2→Fe3++2Br-

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