Work required for compression of a gas contained in a cylinder is 7000 kJ. During compression, heat interaction of 3000 kJ causes the surroundings to be heated. Internal energy change of the gas during the compression is __________ kJ.

A. +4000

B. -4000

C. 10000

D. -10000

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

You can do it
  1. With increase in compression ratio, the volumetric efficiency of air compressor
  2. Percentage of argon (by volume) in dry atmospheric air is about
  3. The ratio of the shear stress to the principal stress on a principal plane is
  4. The 'laughing gas' is
  5. When an isolated thermodynamic system executes a process,
  6. Iron content in Indian iron ore is about __________ percent.
  7. Which of the following is an example of cathodic protection of metals against corrosion?
  8. In a neutral solution
  9. Metalloids
  10. An ideal material for making cooking vessels should have
  11. Reynolds number of a fluid flowing in a circular pipe is 10,000. What will be the Reynolds number when…
  12. In a counter flow heat exchanger, hot fluid enters at 170°C & leaves at 150°C, while the cold…
  13. Resistance of an electrical conductor is proportional to its (where, l = length and A = cross-sectional…
  14. The most important consideration, while designing the refrigeration system of an aircraft is that the…
  15. There are one octahedral void and __________ tetrahedral void in the closest packing of atoms.
  16. The bolt is subjected to __________ when the nut is tightened by putting the washer beneath it.
  17. Isotropic materials have the same __________ in all directions.
  18. The friction factor for the turbulent fluid flow in a rough pipe does not depend upon the
  19. Superheating of steam is done at constant
  20. Which of the following rays has the least wavelength?
  21. Pick out the wrong statement.
  22. Good design of the casing of a centrifugal pump aims at minimising the
  23. The value of for air & most common gases can be safely assumed to be
  24. To improve the machinability of steel, it is generally subjected to
  25. The majority charge carriers in p-type silicon are
  26. The only suitable method for hardening the low carbon steel is case hardening. Which of the following…
  27. The capacity of a spring to store energy is called the spring form co-efficient. Stiffness of a spring…
  28. One ton of refrigeration is not equivalent to the heat removal rate of
  29. For an ideal gas, Cp - Cv is
  30. Two solutions A1 & A2 have pH value of 2 & 6 respectively. It implies that the solution