If atmospheric temperature and dew point are nearly equal, then the relative humidity is_______________?

Related Mcqs:

1. The dew point temperature lines on psychrometric charts are straight inclined sloping downwards to the right. When relative humidity of moist air is 100%, then_________________?

   A. Wet bulb temperature=dry bulb temperature
   B. Wet bulb temperature=dew point temperature
   C. Saturation temperature=dew point temperature
   D. All ‘A’, ‘B’ & ‘C’

2. Air at a temperature of 20°C and 750 mm Hg pressure has a relative humidity of 80%. What is its percentage humidity? Vapour pressure of water at 20°C is 17.5 mm Hg?

   A. 80.38
   B. 80
   C. 79.62
   D. 78.51

3. The dew point of moist air becomes ____________________ with decrease in its relative humidity ?

   A. Less than the wet bulb temperature
   B. More than the wet bulb temperature
   C. More than the dry bulb temperature
   D. Equal to wet bulb temperature

4. The wet bulb temperature is lower in dry air than in wet air at the same temperature. A dry bulb thermometer registers a higher temperature than a wet bulb thermometer except at ______________ percent relative humidity ?

   A. 0
   B. 100
   C. 50
   D. None of these

5. For most salts, the solubility increases with rise in temperature, but the solubility of _______________ is nearly independent of temperature rise?

   A. Sodium chloride
   B. Sodium carbonate monohydrate
   C. Anhydrous sodium sulphate
   D. Hypo

6. Atmospheric pollution caused by the exhaust gas of supersonic transport air-crafts is mostly in the atmospheric region called________________?

   A. Thermosphere
   B. Stratosphere
   C. Troposphere
   D. Mesosphere

7. All gases except ____________ shows a cooling effect during throttling process at atmospheric temperature and pressure?

   A. Oxygen
   B. Nitrogen
   C. Air
   D. Hydrogen

8. All gases during throttling process at atmospheric temperature and pressure show a cooling effect except__________________?

   A. CO2
   B. H2
   C. O2
   D. N2

9. Joule-Thomson co-efficient which is defined as, η = (∂T/∂P)H = 1/Cp (∂H/∂T)P, changes sign at a temperature known as inversion temperature. The value of Joule-Thomson co-efficient at inversion temperature is ___________________?

   A. 0
   B. ∞
   C. +ve
   D. -ve

10. Critical solution temperature (or the con-solute temperature) for partially miscible liquids (e.g., phenol-water) is the minimum temperature at which___________________?

    A. A homogeneous solution (say of phenol water) is formed
    B. Mutual solubility of the two liquids shows a decreasing trend
    C. Two liquids are completely separated into two layers
    D. None of these