Related Questions

The number of bacteria in a colony was growing exponentially . At 1 pm yesterday the number of bacteria was 1000 and at 3 pm yesterday it was 4000. How many bacteria were there in the colony at 6 pm yesterday ?
ক 32,000
খ 80,000
গ 60,072
ঘ 7,683
A certain population of bacteria doubles every 10 minutes. If the number of bacteria in the population initially was 104, what was the number of bacteria in the population 1 hour later?
ক 2(104)
খ 6(104)
গ (26) (104)
ঘ (106)(104)
It takes 30 days to fill a laboratory dish with bacteria, If the size of the bacteria doubles each days, how long will it take for the bacteria to fill one-----half of the dish?
ক 10 days
খ 15 days
গ 24 days
ঘ 29 days
Disinfection of water is done to destroy pathogenic bacteria and thus prevent water-borne diseases. Disinfection of water may be done by the use of
ক Ozone and iodine
খ Chlorine or its compounds
গ Ultraviolet light for irradiation of water
ঘ All of the above
Autoclave এর কাজ-
ক ভাইরাস ধ্বংশ করা
খ টিটেনাস জীবানু মারা
গ ফাংগাস ধ্বংশ করা
ঘ সব জীবানু সম্পূর্ণ ধ্বংশ করা
A reactor is generally termed as an autoclave, when it is a
ক High pressure batch reactor
খ Atmospheric pressure tank reactor
গ High pressure tubular reactor
ঘ Atmospheric pressure CSTR
Temperature and pressure in urea autoclave is
ক 120°C and 300 atm
খ 190°C and 200 atm
গ 400°C and 550 atm
ঘ 200°C and 10 atm
The composition of fresh feed to the high temperature, high pressure urea autoclave is
ক Excess liquid ammonia and liquefied CO2
খ Excess liquid ammonia and compressed CO2 gas
গ Liquid ammonia and excess compressed CO2
ঘ Compressed ammonia gas and excess compressed CO2
The reaction A (l) R(g) is allowed to reach equilibrium conditions in an autoclave. At equilibrium, there are two phases, one a pure liquid phase of A and the other a vapor phase of A, R and S. Initially A alone is present. The number of degrees of freedom are
ক 1
খ 2
গ 3
ঘ 0
Urea autoclave is made of
ক Cast iron
খ Refractory blocks
গ Stainless steel
ঘ Lead lined steel

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