Half life of a radioactive isotope corresponds to the time required for half of the __________ to decay.

A. Atoms

B. Neutrons

C. Nucleons

D. Electrons

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  1. Otto cycle used in spark ignition petrol engines is also known as the constant __________ cycle.
  2. Moist air is cooled along the line of constant __________ , when it is passed over a cold & dry cooling…
  3. Screws are specified by their __________ diameters.
  4. The thermodynamic law, = constant, is not followed by the
  5. Iron content in Indian iron ore is about __________ percent.
  6. Which of the following is the correct nature of shear stress distribution along the cross section in…
  7. Melting point & boiling points of liquid oxygen are respectively - 218.8°C & - 183°C, while…
  8. Pick out the correct statement.
  9. Consider an ideal solution of components A and B. The entropy of mixing per mole of an alloy containing…
  10. Thermit welding is categorised as the __________ welding.
  11. Which of the following is the most suitable material of construction for the condenser tubes, where…
  12. The malleability of a material is the property by virtue of which it can be rolled or hammered into…
  13. Laser is a device to produce
  14. The wet bulb temperature is lower in dry air than in wet air at the same temperature. A dry bulb thermometer…
  15. In connection with corrosion of metals, passivation is the process that
  16. Fine grained steels have
  17. A steam carrying pipeline is insulated with two layers of insulating materials with the inferior insulation…
  18. Alumina, silica, lime and iron oxide are the basic raw material for the manufacture of Portland cement.…
  19. Which of the following is not a dielectric material?
  20. Dryness fraction of dry steam is
  21. The most important consideration in value engineering is the
  22. Carbon supply in pack carburising process is in the form of
  23. For preparation of porous bearings by powder metallurgy, preferred particle shape is
  24. Work done by a/an __________ process is determined by ∫p. dv
  25. __________ pipe is the most suitable for carrying sanitary drainage.
  26. Yield strength of a polycrystalline metal with an average grain size d, is proportional to
  27. Which one is neutral in character?
  28. For grinding of softer materials, the grinding wheel should have __________ grain size.
  29. Removal of non-condensable from steam or other vapour is termed as the __________ process.
  30. Force between the molecules of the same substance is called __________ force.