The lightest non-inflammable gas is_________________?

Related Mcqs:

1. ‘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

2. Velocity of a gas in sound is not proportional to (where, T = Absolute temperature of the gas. P = Absolute pressure of the gas. y = Ratio of specific heats (Cp/Cv) ρ = specific weight of the gas) ?

   A. √T
   B. 1/√P
   C. √y
   D. 1/√ρ

3. A gas which is collected over water becomes moistened due to water vapor, exerts its own partial pressure at the gas temperature, which is termed as its_______________?

   A. Aqueous tension
   B. Saturated humidity
   C. Vapor pressure
   D. Absolute humidity

4. Volumetric composition of flue gas analysed with the Orsat apparatus is : CO2 = 12%, O2 = 8%, CO = nil, N2 = 80%. This flue gas composition indicates that_________________?

   A. Pure oxygen has been used for combustion
   B. Nitrogen percentage in the fuel is very high
   C. Excess air has been used for combustion
   D. Hydrogen is not present in the fuel

5. Work required for compression of a gas contained in a cylinder is 7000 kJ. During compression, heat interaction of 3000 kJ causes the surroundings to be heated. Internal energy change of the gas during the compression is __________________ kJ ?

   A. +4000
   B. -4000
   C. 10000
   D. -10000

6. The best lubricants for a machine working at high temperature & load is_________________?

   A. Grease
   B. Solid lubricant
   C. Animal oils
   D. Mineral oils

7. At 100% relative humidity, the dew point temperature of moist air is_________________?

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

8. The diffusion co-efficient of Ni in Cu at 1000 K is 1.93 × 10-16 m2S-1 and it is 1.94 × 10-14 m2S- 1 at 1200 K. The activation energy (in k. J.mole-1) for the diffusion of Ni in Cu is_________________?

   A. 130
   B. 180
   C. 230
   D. 250

9. Solute atoms which cause yield point phenomenon in mild steel are/is_________________?

   A. Aluminium
   B. Boron
   C. Carbon
   D. Nitrogen

10. Dryness fraction of dry steam is_________________?

    A. 0
    B. ∞
    C. 1
    D. 0.5