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Unbreakable crockeries are made from __________ polymers.

A. Polystyrene

B. Melamine

C. Polystyrene

D. Polyurethane

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

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  1. Wavelength of radiation emitted by a body depends on the __________ of its surface.
  2. Air-petrol ratio for maximum power generation in spark ignition engine is about
  3. Thermal equivalent of electrical power in practical calculation is __________ kcal/kWh.
  4. The temperature at which ferromagnetic material can no longer be magnetised by the outside forces, is…
  5. __________ is not a heat treatment process.
  6. Heat flow across a hollow sphere of inner radius 'r1' and outer radius 'r2' is directly proportional…
  7. During sensible cooling of air, its wet bulb temperature
  8. The ratio of thermal & electrical conductivity is same for all the metals at the same temperature; and…
  9. Hydrogen can be
  10. Pick out the wrong statement.
  11. The main reducing agent in iron blast furnace is
  12. Pick out the wrong statement.
  13. A material subjected __________ must have high resilience.
  14. Limestone addition in the blast furnace is done to flux __________ present in the raw materials.
  15. Which of the following can be manufactured using powder metallurgy techniques?
  16. Temper brittleness of a material can be fairly detected by the __________ test.
  17. Yield strength of a polycrystalline metal with an average grain size d, is proportional to
  18. Catalyst used in the catalytic converter employed in automobiles to convert CO into CO2 and for complete…
  19. The Al2O3 content of cryolite in Hall- Heroult cell is maintained between __________ percent.
  20. __________ of air does not increase with increase in temperature.
  21. Thermistors are used in __________ devices.
  22. The kinematic viscosity (in stoke) and the absolute/dynamic viscosity (in poise) are the same for __________…
  23. Ammonia leakage in the refrigeration system is detected by
  24. Out of the following the refractive index is the highest for
  25. The most important requirement for aluminium industry is the availability of cheap
  26. Drossing is a __________ operation.
  27. In case of brasses, with decreasing zinc percentage and increasing copper percentage, its __________…
  28. Often earing defects are found during deep drawing operation, because the
  29. Nitriding of a steel part does not increase its
  30. Force between the molecules of the same substance is called __________ force.