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কার্বন মৌল হীরা ও গ্রাফাইট-এ ভিন্নরূপ। এদের ক্ষেত্রে কোন উক্তিটি সত্য নয়? (Diamond and graphite are the allotropes of carbon. For them. which of the following statements is incorrect?
A উভয়েই কার্বন মৌল দ্বারা গঠিত। (Both of them are made of carbon.)
B হীরা ও গ্রাফাইটে কার্বন পরমাণুর সংকরায়ন হলো যথাক্রমে sp3 ও sp2 (Hybridization of carbon atom in diamond and graphite are sp3 and sp2, respectively.)
C উভয়ের দহন তাপ একই। (Both of them possesses the same heat of combustion.)
D উভয়ের বিদ্যুৎ পরিবাহিতা ভিন্ন। Both of them possesses different electrical conductivity.)
কার্বন মৌল হীরা ও গ্রাফাইট -এ ভিন্নরূপ। এদের ক্ষেত্রে কোন উক্তিটি সত্য নয়? (Diamond and graphite are the allotropes of carbon. For them, which of the following statements is incorrect?)
A উভয়েই কার্বন মৌল দ্বারা গঠিত। (Both of them are made of carbon )
B হীরা ও গ্রাফাইটে কার্বন পরমাণুর সংকরায়ন হলো যথাক্রমে sp3 ও sp2। (Hybridization of carbon atom in diamond and graphite are sp3 and sp2, respectively.)
C উভয়ের দহন তাপ একই (Both of them possesses the same heat of combustion)
D উভয়ের বিদ্যুৎ পরিবাহিতা ভিন্ন। (Both of them possesses different electrical conductivity)
Which is the main reducing agent during production of iron from iron ore in a blast furnace?
A C
B CO
C CO2
D H2
Midrex process of sponge iron production uses reformed natural gas as the reducing agent, which uses iron ore in the form of
A Lumps
B Pellets
C Briquettes
D Sinter
The main reducing agent in iron blast furnace is
A Carbon dioxide
B Carbon monoxide
C Oxygen
D Air
Powder metallurgy is used to produce
A High precision components with complex cavities and sharp features
B Components of large size
C Porosity free components
D Components of such alloys whose constituents do not form alloys readily
Powder metallurgy processing can be used for making
A Dispersion strengthened copper rod
B Self lubricating bearing and cemented carbide
C Connecting rod
D Piston
Powder metallurgy technique is used in the production of __________ tools.
A Tungsten carbide
B High carbon steel
C High speed steel
D Drilling
Defining green banking is relatively easy. It means promoting environment -friendly practices and reducing your carbon footprint from your banking activities. This comes in many forms : using online banking instead of branch banking; paying bills online, opening up CDs (certificates of deposit) and money market accounts at online banks instead of large multi-branch banks. A green bank takes the biggest steps to support local green initiatives. Any combination of the above personal banking practices can help the environment. In this respect, online banks and smaller community banks have better track records than larger banks .However, these larger banks may be induced to go green . According to the passage, larger, multi -branch banks .
A can never become green banks .
B can become green banks if they reduce the number of branches and eliminate the use of paper .
C can become green banks if they can greatly reduce or eliminate carbon footprint form their banking activities.
D can become green banks if they support local green initiatives
The operation in which oil is permeated into the pores of a powder metallurgy product is known as
A Mixing
B Sintering
C Impregnation
D Infiltration

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