The heat released by cooling one mole of copper from 400 K to room temperature (300 K) is (assume : Cp of copper is 23 J K-1mole-1)

A. 2300 J

B. 4600 J

C. 230 J

D. 2.3 × 106 J

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

You can do it
  1. Pick out the wrong conversion of absolute & kinematic viscosities.
  2. Hydro-cyclone is a
  3. Neutrons are present in all atoms except that of
  4. The cathode in an electrochemical cell always carries
  5. An abrupt and sudden fall in the reading of barometer is an indication of the
  6. The laminar boundary layer thickness in zero pressure gradient flow over a flat plate along the x-direction…
  7. Fahrenheit and Centigrade scales have the same readings at
  8. Fine grained steels have
  9. Use of economiser in a boiler plant reduces the fuel consumption for steam generation by about __________…
  10. Force between the molecules of the same substance is called __________ force.
  11. The ability of tool steel to resist softening at high temperatures is termed as __________ hardness.
  12. Pick out the wrong statement about the machinability of metals. Machinability of a metal
  13. Air-petrol ratio in an automotive petrol engine is around
  14. A solution which resists change in its pH value on addition of acid/alkali is called the __________…
  15. Limestone is added in the blast furnace (during pig iron manufacture) to
  16. Out of the following the refractive index is the highest for
  17. Friction factor for fluid flow in pipe does not depend upon the
  18. Earing is a defect found in steels after the following metal working operation.
  19. Which of the, following is not associated with the functioning of a petrol engine?
  20. Which of the following contributes maximum as main source of sulphur in the blast furnace charge?
  21. Pick out the wrong statement.
  22. Working of linear variable differential transducer (LVDT) is based on the principle of variable
  23. Evaporative cooling process employs a combination of cooling and humidification in which the
  24. Which of the following has the least value of ultimate tensile strength (UTS)?
  25. Transition from laminar to turbulent zone in free convection heat transfer is governed by the critical…
  26. Cementite is in the lamellar form in the __________ phase of steel.
  27. Gas turbine normally employs a constant __________ cycle.
  28. Which of the following heat treatment processes is usually applied to castings?
  29. Corona discharge is related to the operation of a/an
  30. Plasma is