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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

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  1. Which of the following is an example of stress corrosion?
  2. Eutectic reaction for iron-carbon system occurs at a temperature of __________ °C.
  3. Pick out the wrong statement.
  4. __________ is not used as the control rod material in a nuclear reactor.
  5. Damage to metal surface by mechanical action is called
  6. __________ of test specimens is not involved in any hardness testing method.
  7. Work hardenable alloy steel used to make the bucket wheel excavators, blades of bulldozers and other…
  8. Lap joints are preferred over butt joints in soldering/brazing, because these joints are
  9. Corona discharge is related to the operation of a/an
  10. The following type of bonding is strongly directional in solids.
  11. Principal alloying element in Elinvar (used for making hair springs for watches) is
  12. Cold cracking in the heat affected zone of a high strength steel weld can take place because of the
  13. The excess air required for the combustion of pulverised coal is of the order of about __________ percent.
  14. The main reducing agent in iron blast furnace is
  15. The minimum and the maximum number of members required to form a Private Limited Joint Stock Company…
  16. The activity co-efficient of the solute in a dilute solution
  17. Temperature of hot gases flowing in a pipe is measured by a thermocouple inserted in the thermal well.…
  18. Age hardening is connected with
  19. Transformer cores are normally made from
  20. Lead is added to 60:40 brass primarily to improve
  21. The heat of neutralisation remains constant, when there is a reaction between dilute solutions of strong
  22. Titanium is added to molten aluminium alloys before casting for the purpose of
  23. A pycnometer is used for the measurement of
  24. Specific gravity of a metal, which weighs 5 kg in air and 4 kg when submerged in water, will be
  25. Silicon in steel
  26. Steel is welded using the __________ flame.
  27. Which of the following is the most suitable material of construction for the condenser tubes, where…
  28. Alloying elements present in Haynes stellite, which has superior performance than high speed steel,…
  29. Cold chisel & hammers are made of
  30. What is the percentage of chromium in 18-4-1 high speed steel?