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26th July 2016, 11:38 AM
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IIT JEE Thermodynamics Questions
Can you provide me some Heat and Thermodynamics questions for preparation of Indian Institutes of Technology Joint Entrance Examination (IIT-JEE)?
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#2
26th July 2016, 01:15 PM
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Re: IIT JEE Thermodynamics Questions
Some Heat and Thermodynamics questions for preparation of Indian Institutes of Technology Joint Entrance Examination (IIT-JEE) are as follows: 1.When a metal rod is heated it expands because: the size of its atoms increases the distance among its atoms increases atmospheric air rushes into it the actual cause is still unknown 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: equal to that of helium twice that of helium half that of helium v2 times that of helium 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: 2 km/s 8 km/s 0.5 km/s 1 km/s 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: 140 J 70 J 110 J 150 J 5.The internal energy U is a unique function of any state because change in U: does not depend upon path depend upon path corresponds to an adiabatic process corresponds to an isothermal process 6.In a thermodynamic system working substance is ideal gas its internal energy is in the form of: kinetic energy only kinetic and potential energy potential energy none of the above 7.Gas exerts pressure on the walls on the container because: gas has weight gas molecules have momentum gas molecules collide with each other gas molecules collide with the walls of the container 8.For a perfect gas if: P and V are given T is uniquely determined T is given P is uniquely determined T is given V is uniquely determined T is given P and V both are uniquely determined 9.The respective speeds of five molecules are 2, 1.5, 1.6, 1.6 and 1.2 km/s, the most probable speed in km/s will be: 2 1.58 1.6 1.31 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 increases the pressure decreases the pressure remains the same the pressure may increase or decrease depending on the nature of the gas 11.Which of the following statements is correct for any thermodynamic system? The internal energy changes in all processes Internal energy and entropy are state functions The change in entropy can never be zero The work done in an adiabatic process is always zero 12.If a system undergoes contraction of volume, then the work done by the system is: positive negative negligible zero 13.Heat given to a body which raises its temperature by 1degree centigrade is: water equivalent thermal capacity specific heat temperature gradient 14.Significant motion for the molecules of a monoatomic gas corresponds to: translatory vibratory rotatory none of these 15.If the door of a refrigerator is kept open then which of following is true? Room is cooled Room is heated Room is either cooled or heated Room is neither cooled nor heated 16.The most efficient heat engine is one which is: reversible irreversible driven by high speed diesel none of the above 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? 30% 40% 15% 25% 18.When rod is heated but prevented from expanding, the stress is independent of: material of the rod rise in temperature length of rod none of these 19.For an isolated system: volume is constant pressure is constant temperature is constant all of these 20.Internal energy of ideal gas depend on: only pressure only volume only temperature 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: 0.56 L 1.2 L 2.4 L 5.6 L 22.If mass-energy equivalence is taken into account, when water is cooled to form ice, the mass of water should: increase remain unchanged decrease first increase then decrease 23.Which statement is incorrect? All reversible cycles have same efficiency Reversible cycle has more efficiency than an irreversible one Carnot cycle is a reversible one Carnot cycle has the maximum efficiency in all cycles 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: 3.75 J 37.5 J 0.375 J 0.75 J 25.The process in which the heat is not transferred from one state to another, is: isothermal process adiabatic process isobaric process isochoric 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: second law of thermodynamics conservation of momentum conservation of mass first law of thermodynamics 27.The specific heat of gas in an isothermal process is: zero infinite negative remains constant 28.The standard fixed point for temperature measurement is used these day is: melting point of ice at STP that temperature at which ice water and water vapour coexist that temperature at which pure ice and pure water coexist none of the above 29.Which of the following parameters does not characterize the thermodynamic state of matter? Volume Temperature Pressure Work |
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