Separation of the isotopes of helium for scientific investigations is done by_____________________?

Related Mcqs:

1. The cooling effect in a cooling tower cannot be increased by_____________________?

   A. Increasing the air velocity over the wet surfaces
   B. Reducing the humidity of entering air
   C. Lowering the barometric pressure
   D. None of these

2. _______________ diffusion is used for separating the isotopes of methane ?

   A. Thermal
   B. Pressure
   C. Concentration
   D. Force

3. Azeotropism for ethyl alcohol-water system disappears by_____________________?

   A. Increasing temperature
   B. Decreasing pressure
   C. Increasing pressure
   D. No means

4. Separation of two volatile liquids by distillation makes use of their___________________?

   A. Selectivity
   B. Relative volatility
   C. Solubility
   D. Density difference

5. Steam distillation is used for separation of high boiling ____________________?

   A. Substances from non-volatile impurities
   B. Volatile impurity from still higher boiling substances
   C. Both A. and B.
   D. Neither A. nor B.

6. The feed to fractionating column is changed from saturated vapour to saturated liquid. If the separation and reflux ratio remains unchanged, the number of ideal stages will______________________?

   A. Increase
   B. Decrease
   C. Remain same
   D. Depend on saturated boiling point; may increase or decrease

7. For the same feed, feed quality and separation (in a distillation column), with the increase of total pressure, the number of ideal plates will_____________________?

   A. Increase
   B. Decrease
   C. Remain same
   D. Data insufficient, can’t be predicted

8. In a binary system, separation is very efficient, when the relative volatility is_______________?

   A. 1
   B. > 1
   C. < 1
   D. 0.5

9. Solvent extraction is the terminology applied to the liquid-liquid extraction, which is preferred for the separation of the components of liquids, when____________________?

   A. Extracting solvent is cheaply & abundantly available
   B. One of the liquid components is heat sensitive
   C. Viscosity of liquid components is very high
   D. One of the liquid components has very high affinity towards the solvent

10. The minimum number of theoretical plates is required for achieving a given separation in distillation column with_________________?

    A. No reflux
    B. Total reflux
    C. Zero reflux ratio
    D. Minimum reflux ratio