Percentage of argon (by volume) in dry atmospheric air is about________________?

Related Mcqs:

1. Latent heat of dry steam at atmospheric pressure is 539 Kcal/kg; which _____________ with increase in the pressure of steam?

   A. Decreases
   B. Increases
   C. Remain same
   D. May increase or decrease

2. Air/fuel ratio on molar (volume) basis for combustion of methane with theoretical quantity of air with be________________?

   A. 9.5 : 1
   B. 12.5 : 1
   C. 15.5 : 1
   D. 18.5 : 1

3. Brass parts with high residual tensile stress at the surface are susceptible to season cracking (i.e. spontaneous cracking occuring on exposure to atmospheric corrosion), if its zinc percentage is more than ?

   A. 5
   B. 10
   C. 20
   D. 35

4. Rain drops falling through atmospheric air attain limited terminal velocity, because of ____________________?

   A. Upward thrust due to air
   B. Viscous force exerted by air
   C. Surface tension effects of water
   D. Force of gravity

5. Compressed dry air is used as the cutting fluid, while machining____________________?

   A. Steel
   B. Cast iron
   C. Aluminium
   D. None of these

6. Moist air is cooled along the line of constant ________________ , when it is passed over a cold & dry cooling coil, such that no condensation occurs ?

   A. Enthalpy
   B. Relative humidity
   C. Wet bulb temperature
   D. Dew point temperature

7. When dry bulb temperature & wet bulb temperature of moist air is the same, it means that the _________________?

   A. Partial pressure of water vapour is less than the total pressure
   B. Humidity is < 100% & dew point temperature of air has not reached
   C. Dew point temperature of air has not reached & air is not saturated fully
   D. Air is fully saturated

8. Volume of blast furnace slag is about _______________ times the volume of hot metal (pig iron) of the same weight ?

   A. 1.5
   B. 3
   C. 5
   D. 7

9. A cylindrical rod subjected to a tensile strain within the elastic limit undergoes a volume change. If the volume strain is equal to half the tensile strain, then the Poisson’s ratio of the rod is___________________?

   A. 0
   B. 0.33
   C. 0.44
   D. 0.25

10. ‘Dikes’ are low height walls made around the storage vessels meant for storing hazardous & inflammable material (e.g., petroleum products). Volume of dikes is equal to (where, V = volume of the storage vessel) ?

    A. V
    B. V/2
    C. 2V
    D. 3V