Which one of the following gases is most significant as air pollutant ?

Related Mcqs:

1. The most dangerous pollutant in vehicular emissions is____________________?

   A. CO
   B. SO2
   C. CO2
   D. O3

2. Reynolds number is significant in____________________?

   A. supersonics, as with projectile and jet propulsion
   B. full immersion or completely enclosed flow, as with pipes, aircraft wings, nozzles etc
   C. simultaneous motion through two fluids where there is a surface of dis-continuity, gravity forces, and wave making effect, as with ship’s hulls
   D. all of the above
   E. none of the above

3. Froude number is significant in____________________?

   A. supersonics, as with projectile and jet propulsion
   B. full immersion or completely enclosed flow, as with pipes, aircraft wings, nozzles etc.
   C. simultaneous motion through two fluids where there is a surface of dis-continuity, gravity forces, and wave making effect, as with ship’s hulls
   D. all of the above
   E. none of the above

4. Mach number is significant in___________________?

   A. supersonics, as with projectiles and jet propulsion
   B. full immersion or completely enclosed flow, as with pipes, aircraft wings, nozzles etc.
   C. simultaneous motion through two fluids where there is a surface of dis-continuity, gravity force, and wave making effects, as with ship’s hulls
   D. all of fhe above
   E. none of the above

5. For very great pressures, viscosity of moss gases and liquids __________________?

   A. remains same
   B. increases
   C. decreases
   D. shows erratic behaviour
   E. none of the above.

6. Dynamic viscosity of most of the gases with rise in temperature___________________?

   A. increases
   B. decreases
   C. remains unaffected
   D. unpredictable
   E. none of the above

7. A balloon lifting in air follows the following principle_________________?

   A. law of gravitation
   B. Archimedes principle
   C. principle of buoyancy
   D. all of the above
   E. continuity equation

8. To avoid an interruption in the flow of a syphon, an air vessel is provided______________?

   A. at the inlet
   B. at the outlet
   C. at the summit
   D. ay nay point between inlet and outlet
   E. none of the above

9. A piece weighing 3 kg in air was found to weigh 2.5 kg when submerged in water. Its specific gravity is__________________?

   A. 1
   B. 5
   C. 7
   D. 6

10. The pressure in the air space above an oil (sp. gr. 0.8) surface in a tank is 0.1 kg/cm”. The pressure at 2.5 m below the oil surface will be ___________________?

    A. 2 meters of water column
    B. 3 meters of water column
    C. 3.5 meters of water column
    D. 4 m of water column
    E. none of the above