Related Questions

তরল অবস্থায় পরিবর্তিত না হয়ে কঠিন অবস্থা থেকে সরাসরি গ্যসীয় অবস্থায় রূপান্তরিত হওয়ার পদ্ধতিকে বলে(The conversion of solid state directly into a gaseous state eithout passing through liquid state is called)
A Sublimation
B Evaporation
C Freezing
D Boiling
In the gaseous diffusion process of uranium enrichment, the natural uranium is converted into gaseous
A Uranium oxide
B Uranium hexaflouride
C Uranium carbide
D Uranium sulphate
Which one can be directly solidified from gaseous state wihtout entering into liquid state?
A Helium
B Oxygen
C Carbon dioxide
D None of these
The presence of solid, liquid or gaseous compounds, which may not be normally present, or in excess concentration in the atmosphere is called
A air pollution
B water pollution
C soil pollution
D radioactive pollution
With an increase in pressure in gaseous phase chemical reactions, the fractional conversion __________ when the number of moles decreases.
A Increases
B Decreases
C Remains unaffected
D Unpredictable from the data
Gaseous exchanges through the respiratory membrane is directly proportional to
A Surface area of respiratory membrane
B Diffusion co-efficient of gas
C Solubility of the gas
D The thickness of respiratory membrane
E Molecular weight of the gas
Gasification of the solid fuel converts its organic part into combustible by interaction with air/oxygen and steam so as to obtain a secondary gaseous fuel of high calorific value having no ash. Gasification reactions are normally carried out at about __________ °C.
A 400-500
B 900-1000
C 1400-1500
D 1700-1800
Pick out the wrong conversion formula for the conversion of weight units :
A 1 tonne = 1000 kg = 22.046 lbs
B 1 U.S. ton = 907 kg = 0.907 tonne = 0.893 ton
C 1 ton = 2240 lbs = 1016 kg = 1.016 tonnes = 1.12 U.S. tons
D None of these
A solid cone of height 36 cm and radius of base 9 cm is melted to form a solid cylinder of radius 9 cm and height 9 cm. What percent of material is wasted this process?
A 25
B 5
C 0
D 10
Computers cannot communicate with each other directly over telephone lines because they use digital pulses whereas telephone lines use analog sound frequencies. What is the name of the device which permits digital to analog conversion at the start of a long distance transmission?
A Interface
B Modem
C Attenuation
D Teleprocessor
E None of the above

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