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IIT JEE Heat And Thermodynamics

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1. When a metal rod is heated it expands because:




2. Two vessels having equal volume contain molecular hydrogen at one atmosphere and helium at two atmospheres respectively. If both samples are at the same temperature the mean velocity of hydrogen molecules is:




3. At a certain temperature, hydrogen molecules have rms velocity 2 km/s. The rms velocity of the oxygen molecules at the same temperature is:




4. If the heat of 110 J is added to a gaseous system and change in internal energy is 40 J, then the amount of external work done is:




5. The internal energy U is a unique function of any state because change in U: depend upon path corresponds to an adiabatic process




6. In a thermodynamic system working substance is ideal gas its internal energy is in the form of:




7. Gas exerts pressure on the walls on the container because:




8. For a perfect gas if:




9. The respective speeds of five molecules are 2, 15, 16, 16 and 12 km/s, the most probable speed in km/s will be:




10. Air in a cylinder is suddenly compressed by a piston which is then maintained at the same position. With the passage of time: the pressure decreases




11. Which of the following statements is correct for any thermodynamic system?




12. If a system undergoes contraction of volume, then the work done by the system is:




13. Heat given to a body which raises its temperature by 1degree centigrade is:




14. Significant motion for the molecules of a monoatomic gas corresponds to:




15. If the door of a refrigerator is kept open then which of following is true?




16. The most efficient heat engine is one which is:




17. A gas is filled in a cylinder Its temperature is increased by 20% on kelvin scale and volume is reduced by 10% How much percentage of the gas has to leak for pressure to remain constant?




18. When rod is heated but prevented from expanding, the stress is independent of:




19. 9.For an isolated system:




20. Internal energy of ideal gas depend on: only volume none of these




21. The molecular weight of gas is 44. The volume occupied by 2.2 g of this gas at 0 degreeCentigrade and 2 atm pressure, will be: 2.4 L




22. If mass-energy equivalence is taken into account, when water is cooled to form ice, the mass of water should:




23. Which statement is incorrect?




24. A block of mass 100 g slides on a rough horizontal surface If the speed of the block decreases from 10 m/s to 5 m/s the thermal energy developed in the process is:




25. The process in which the heat is not transferred from one state to another, is: isothermal process




26. Heat cannot be itself flow form a body at lower temperature to a body at higher temperature is a statement of consequence of:




27. The specific heat of gas in an isothermal process is:




28. The standard fixed point for temperature measurement is used these day is:




29. Which of the following parameters does not characterize the thermodynamic state of matter?




30. The scale of temperature on which the temperature are only positive is:




31. The wax melts up to lengths 105 cm and 60 cm for two indentical rods of different metals in Ingen Hausz experiment The ratio of thermal conductivities of the two metals is




32. When a gas is allowed to expand suddenly into a vacuum chamber, then:




33. Molar heat capacity is directly related to:




34. At what temperature is the effective speed of gaseous hydrogen molecules equal to that of oxygen molecules at 47 degreeCentigrade?




35. When water is heated from 0 degree Centigrade to 10 degree centigrade its volume:




36. If r, a and t represent the reflection coefficient, absorption coefficient and transmission coefficient respectively, then for a perfectly black body




37. During adiabatic change, specific heat is:




38. Unsaturated vapour obeys:




39. What work will be done, when 3 moles of an ideal gas are compressed to half the initial volume at a constant temperature of 300 K? J




40. When without change in temperature a gas is forced in a smaller volume, its pressure increases because its molecules:




41. If l is the length, A is the area of cross-section and K the thermal conductivity, then the thermal resistance of the block is given by




42. The pressure of a gas kept in an isothermal container is 200 kPa If half the gas is removed from it, the pressure will be:




43. Two thermometers are constructed in such a way that one has a spherical bulb and other has elongated cylindrical bulb The bulbs are made of same material and thickness Then:




44. The temperature of a substance increases by 27 degree Centigrade On the Kelvin scale this increase is equal to:




45. During an isothermal expansion of an ideal gas:




46. Pyrometer is an instrument used to measure:




47. The thermal resistance of two blocks connected in series will be, if their separate thermal resistances are 2 and 3 is




48. If gas is compressed adiabatically:




49. Which of the following quantities is zero on an average for the molecules of an ideal gas in equilibrium? Density




50. Which of the following carries anomalous expansion?




51. During severe winter in the low temperature zones of the world, the superficial parts of the lakes are frozen leaving water below. That the freezing at the bottom is prevented because:




52. The ratio of thermal capacities of two spheres A and B, if their diameters are in the ratio 1: 2, densities in the ratio 2: 1 and the specific heats in the ratio of 1: 3 will be: