Which one can be directly solidified from gaseous state without entering into liquid state?

A. Helium

B. Oxygen

C. Carbon dioxide

D. None of these

Please do not use chat terms. Example: avoid using "grt" instead of "great".

You can do it
  1. The efficiency of a Carnot heat engine operating between absolute temperatures T1 and T2 (when, T1 >…
  2. __________ metal is used as a bearing liner material.
  3. The leaching solvent used in Baeyer's process for the purification of bauxite is
  4. Nickel is a __________ material.
  5. Thermistors are used in __________ devices.
  6. Which of the following mainly decides the current to be employed is arc welding?
  7. The swift cup test evaluates the following property of a sheet metal.
  8. Drills are usually made of
  9. Heating of ferromagnetic materials to a temperature above Curie temperature makes it
  10. Pick out the wrong statement.
  11. Corrosion rate cannot be lowered by reducing the __________ of the corroding medium.
  12. The thickness of oxide film is y at time t. If are the temperature dependent constants, the parabolic…
  13. Which of the following forces does not act on a fluid at rest?
  14. According to maximum shear stress failure criterion, yielding in material occurs, when the maximum shear…
  15. The refrigerant freon-12 is chemically
  16. The boiling & freezing points on a newly defined temperature scale in degree 'D' are 400°D & 100°D…
  17. Vibration upto 100 kilo hertz can be most accurately measured by a __________ type accelerometer.
  18. Regeneration of molecular sieve requires it to be heated to a temperature of about __________ °C.
  19. Pick out the wrong statement.
  20. While the recrystallisation temperature for pure metals is 0.3 Tm, the same for alloys is equal to __________…
  21. Normalising of a casting does not
  22. Otto cycle used in spark ignition petrol engines is also known as the constant __________ cycle.
  23. __________ the exhaust gas is an indication of the incomplete combustion of fuel.
  24. Function of fusible plug in a boiler is to
  25. __________ circuit is most commonly used to measure strain with the help of a strain gauge.
  26. Lap joints are preferred over butt joints in soldering/brazing, because these joints are
  27. Out of the following, the joint produced by __________ has the lowest strength.
  28. Air/fuel ratio on molar (volume) basis for combustion of methane with theoretical quantity of air with…
  29. Venturimeter is used to measure the flow rate of fluids in pipes, when the pipe is in __________ position.
  30. Blasting of tri-nitro-toluene (TNT) is done by mixing it with ammonium