Thermodynamics Questions and Answers

0 5 mole of an ideal gas maintained at constant temperature 27 C is kept inside a cylinder of cross sectional area A closed by a massless piston The cylinder is attached with a conducting rod of length L cross sectional area m and thermal conductivity k whose other end is maintained at 0 C If piston is moved such that rate of flow of heat through the conducting rod is constant then Neglect any kind of heat loss from the system 2 ef 0 5 cych swasta fuzza ar fy ny kuz4 A ych daa h 3i4z zu Ga 21 da ch ata L 3g4z4 ct aha m khyh Jah 93 u a ku afa f a hea f Jah 03 604 gagua ad Agu fa Hur og ma h A B h D A 27 C At h Speed of piston increases with time u au L L L 2 za 10R C h 1 42 fazza chu 29 Correct Answer 0 C speed of piston is 1 10R 2 At h 2 speed of piston is 2 k 100R k 100R Speed of piston decreases with time gay my

Question No 30 The temperature entropy diagram of a reversible engine cycle is given in the figure Its efficiency is TA 2To To So 250 S

5 18 pts An imaginary ideal gas heat engine operates on the following cycle 1 increase the pressure of the gas at constant volume V from P2 to P 2 then reversibly and isothermally expans from P V2 to P2 V 3 finally decreases the volume of the gas at constant pressure P from V to V a Draw the cycle on a P V diagram

6 The graph shown below depicts a cyclic process PQRP for 1 mole of an ideal gas with point A being an initial state The pressure of this gas at A is Zo AVO 7K T To Choose the correct option s from the following A Pressure at point R is Zo 4 B Work done by the gas in process P to Q is ZoVo In4 C Internal energies at point P and Q are the same D Temperature at point R is To 4

ALLE All India Open Test Leader Test Series Joint Package Course JEE Advanced PAPER 1 In the arrangement shown in the figure the cylinder is insulated from the surrounding Both sides same diatomic gas is trapped by two insulting massless pistons with the help of an ideal spring The natural length of the spring is equal to the length of the cylinder Initial state of the gases are as shown in the figure ER INSTITUTE A The value of energy stored in the spring is PV B The value of energy stored in the spring is 2P V C Now the gases are heated slowly such that their temperature becomes three times to their initial temperature The total heat given to the system is 12P V D Now the gases are heated slowly such that their temperature becomes three times to their initial temperature The total heat given to the system is 6P V n P V fast A B fine vaccum ww vefti ca vit u facfua 1 zu i s r una fauzifuae tu ad ya ari fein at veral da fuzzi gri fez ft fine fasseren v n P V V You are screen sharing 4142PV 61 Stop Share

A composite object is formed by combining a uniform rod of circular cross section with thermal conductivity k and a frustum with thermal conductivity 2k as shown in the figure The equivalent thermal conductivity of the object is given as find N Nk 5

28 A gas contained a cylinder fitted with a friction less piston expands against a constant pressure 1 atm from a volume of 4 litre to volume of 14 litre In doing so it absorbs 800J thermal energy from surrounding Then the AE for the process is in J

J mol K An ideal gas has Cy 12 5 Calculate the heat absorbed by 24 mol of the gas at constant volume V 132 960 0 L when the temperature is doubled from its initial value knowing that the initial pressure of the gas is P 1 5 bar Q 7 15 kJ Q 89 4 kJ Q 24 kJ Q 300 kJ

agnetic field of earth is 0 3 gauss A magnet oscillating with rate of 5 oscillation min How much the magnetic field of earth the number of oscillations become 10 per min 0 3 G 0 6 G 0 9 G 1 2 G

Three moles of an ideal monoatomic gas perform cycle as shown The gas temperature in different states are T 400 K T 800 K T3 2400 K T41200 K Net work during cycle P 9 O 20 kJ O 30 kJ O 40 kJ 80 kJ T

One mole of an ideal monatomic gas is taken round the cyclic process ABCA as shown in Figure Calculate 1998 8 Marks 3P Vo a the work done by the gas b the heat rejected by the gas in the path CA and the heat absorbed by the gas in the path AB c the net heat absorbed by the gas in the path BC d the maximum temperature attained by the gas during the cuple 2V

When 1360 J of heat are added to one mole of an deal monatomic gas its temperature increases from 272 K to 275 K Part A Find the work done by the gas during this process Templates Symbicis undo redo Teset keyboard shortcuts h

P V diagram of an ideal gas is as shown Find work 3 done by the gas in ABCD process P 2P P B V 2V 3V 1 4P V 2 2PV 3 3P V 4 PV Two resistances 2052 and 5002 and a pure inductance 4 P V E R 14 1614 441 P 2P P 1 4P V 2 2P V 3 3P V 2002 502 50 4 P V ya Shehra

An ideal gas containing N particles undergoes an isobaric pressure is constant expansion from initial volume V to a final volume Vy Choose the right statement s regarding the heat The system absorbs heat Q greater than the change in the internal energy The work done by the system is greater than the heat exiting out of the system O The system absorbs heat Q less than the change in the internal energy OQ NKBAT

The initial temperature of a two mole of a gas is T If temperature increases to 3T then work done in the adiabatic process is 6 RT The gas is 1 Monoatomic 2 Diatomic 3 Triatomic 4 Polyatomic

57 A movable piston separates a sample of gas from vacuum In this state pressure of a gas is P then find pressure after piston is released adiabatic wall 1 2 5m of gas 11P 5 5P 11 6m vacuum

2 54 An electric heater has coil resistance of 1202 and is operated from 220 V power line If no heat escapes from it then how much time is required to raise the temperature of 40kg of water from 10 C to 80 C

B3 ALLEN Two moles of helium gas undergo a cyclic 33 process as shown in figure Assuming the gas to be ideal the net work done by the gas is P 2 atm 1 atm 300K B 400K T 1 200RIn2 2 100RIn2 3 300RIn2 4 400Rin2 A cyclic process ABCD is shown in the 34 af faa faany gun 2 atm 165 Iatm 1 200RIn2 2 100RIn2 3 300RIn2 4 400RIN2 D 300K 400K her fa T

3 4 400RIn2 A cyclic process ABCD is shown in the 34 following P V diagram Which of the following curves represents the same process Isothermal 2 V st Leader Achiever Course ALL PHASE 150 3 300RIn2 4 400RIn2 T ABCDP V sma vaia Afafanya via T T B KE KE 4 4 3 2 1001CHDI T

4 The total emitted energy will increase to 8 times The density p versus pressure P graphs of a 9 given mass of an ideal gas is shown at two temperatures T and T Then relation between T and T may be 1 T T 2 T T 3 T T 4 All the three are possible 4 af Handl 1 T T 2 T T 3 T T 4 of T

which equation is correct a W Q b W Q c Q W O O b O c a when work goes from system to surrounding it is O Negative O Positive Neutral 1 point 1 point

Please open the attached file to view the figure upon which this question is based Question The work Wca is Question14 pdf 72 KB A 2 80 J B 2 31 J C 4 38 J D 6 00 J E None of the above A heat engine that contains a monoatomic gas is given by the pV diagram below For a monoatomic gas the specific heat capacity at constant volume is Cy R and the specific heat capacity at constant pressure is Cp R where R 8 31 J mol K Questions 6 to 18 are based on this information p kPa 20 0 0 220 C isotherm 100 200 300 V cm

The thermodynamic state of a gas is changed from A to B If you are told that AU is positive which of the following is true a Q 0 W 0 b Q 0 W 0 c Q 0 W 0 d Q 0 W 0 Pressure D A Volume B

A sample of air has the following parameters pressure is 150 kPa volume is 5 m and temperature is 300 K Heat is lost to the surrounding and the final parameters are pressure is 200 kPa and the volume is 7 m3 Calculate the mass of the gas in kg AE and AH in kJ kg

The work done by the gas is the smallest for cycle 4 V O 1 P 2 cannot answer without additional information P V

Figure shows the adiabatic curve on a log T and log V scale performed on ideal gas The The gas is A Monatomic B Diatomic C Polyatomic D Mixture of monatomic and diatomic log T 5 432 1 A B 0 1 2 3 4 5 log V

Two moles of an ideal mono atomic gas undergo a cyclic process as shown in the figure The 3T2 2T4 T3 1800 K Determine the temperatures in different states are given as 6T work done by the gas during the cycle T estion Type Single Correct Type 1 2 3 4 1200 R 1200 R 1575 R 800 R atus Unattempted 16 45 OB Unit Test 7 NEE PUG LANDEN SCOREBOARD OVERVIEW PERFORMARICE LEADERBOARD Question Type Single Correct Type P Air is filled in a tube of the wheel of a car at 27 C and atm pressure if the tube is suddenly bursts the final temperature of air will be y 1 5 21 3 1 251 33 C English

taken round the cyclic process ABCA as shown in figure then 3P P B V 2V 1 Work done by the gas in ABCA process is PV 2 2 The heat absorbed by the gas in the path 7P V 2 BC is 3 The heat rejected by the gas in the path 3P V 2 BC is 4 The heat absorbed by the gas in the path 7P V farger ABCArt Gal 3P PLA V 2V 1 ABCA MINH AN GIT f2 12 G P V1 2 2 BCR 3 BCI A 4 BCT RA 7PV 1 2 3PV 1 2 7PV 5 1

NEET PHYSICS Q 97 Two moles of an ideal monoatomic gas is Q 97 taken round the cyclic process ABCA as shown in figure then 3P P All India Major Test Series Phase I II Major Test 25 19 16 05 2020 atat ABCA vildl B 2V 1 Work done by the gas in ABCA process is P V 2 2 The heat absorbed by the gas in the path BC is TPV 7P 3 The heat rejected by the gas in the path BC is 3PV 2 BC is 4 The heat absorbed by the gas in the path 7P V farger 3P PLA V 2V 1 ABCART P V 2 2 BCR 4 BC V 7P V 81 2 81 3 BC 3PV 2 7PV 5 1

At 4 C a thermos bottle holds 150 g of water At 100 C 90 g of metal is inserted inside The temperature of the water and the metal is 21 C once equilibrium has been attained What is metal s specific heat Assume that the thermos bottle does not lose any heat water specific heat 1 cal g C I Select the correct response 0 44 cal g C 0 28 cal g C 0 40 cal g C 0 36 cal g C

Single Choice The specific heats Cp and Cy of a diatomic gas A are 29 J mol K 1 and 22 J mol K respectively Another diatomic gas B has the corresponding values as 30 J mol K 1 and 21 J mol K respectively Which among the following is correct A has one vibrational degree of freedom and B has two vibrational degrees of freedom A has one vibrational degree of freedom and B has zero vibrational degree of freedom A and B both have one vibrational degree of freedom A and B both have two vibrational of freedom Allahnutnotes com

Also explain same condition for exothermic reaction mol L s 6 25 x 10 mol L s For an endothermic reaction energy of activation is E and enthalpy of reaction is AH both of these in kJ mol Minimum value of E will be AIPMT Prelims 2010 1 Less than AH 2 Equal to AH 3 More than AH

7 5 is A certain quantity of 02 Y compressed isothermally until its pressure is doubled P the gas is then allowed to expand adiabatically until its origional volume is restored then the final pressure P3 is term s of initial pressure P is 2 5 1 148 Question Type Single Correct Type 1 2 3 4 P 0 55 P P3 0 76 P1 P3 0 68 P P3 2 55 P1

A monoatomic ideal gas undergoes a cyclic process ABCDEA as shown in the P V diagram B isothermal and P3V P V3 Then which of the following curve s is correctly converted D C D B E A E B B b VO A B D T T P P P

98 A monoatomic ideal gas undergoes certain Q 98 process PV constant for which the molar heat capacity is zero The value of n equals 1 Infinite 2 zero 3 3 2 4 5 3 eft afft Pfad PV us for TAR 1 3 3 3 2 2 4 5 3

The entropy change for the process H O s H O 1 is 46 2 J K and requires that the surroundings transfer 17 9 kj of heat to the system Calculate th change in entropy for the universe in kJ K at 64 8 C

A metallic wire with two masses each of mass m fixed at the two ends is passing over a slab of ice This wire passes through the ice slab without splitting it This demonstration is used in process Vaporisation Sublimation Condensation

what is the below formula what is the diffrent between them How I can use them explain the meaning of each letter specific heat of fusion resistivity E p e P P P Hrus p P E 1 P P H us P2

1 the gas is at pressure P If the mass of all cules is halved and their speed is doubled resultant pressure will be b P c P 2 d 4P Karnataka NEET 2013 ich of the following properties of a gas will ional energy ty ic energy 2 for hydrogen helium and another ideal diatomic gas X whose molecules are not rigid but have an additional vibrational mode are respectively equal to 759 a b 5 3 7 21 The value of c 5 d 579 3 5 7 7

E Two cylinders A and B of equal capacity are connected to each other via a stopcock A contains an ideal gas at standard temperature and pressure B is completely evacuated The entire system is thermally insulated The stopcock is suddenly opened The process is a isothermal c isochoric b adiabatic d isobaric NEET 2020

monoatomic gas is shown in figure The molar specific heat of the gas in the process will be 1 C Poni joms telem kong mp 81 mp erigaomis bns 0 0 is ei ole emot el esl mol 11 00 3R of nexst smit neri n 2 2 2R ST Bae9v ar beanebnos Amp 8 t V ollo8 Sa aqmet

288 es a nin Equation of State 10 A cylinder contains hydrogen gas at pressure of 249 kPa and temperature 27 C Its density is R 8 3J mol K a 0 5 kg m 3 c 0 1 kg m b 0 2 kg m d 0 02 kg m NEET 2020

A container of neon gas has the following properties 1 0 5 moles 2 T 340 K 3 p 0 6 atm Calculate the Helmholtz free energy in kJ kilojoules as a number in normal form accurate to 1 decimal place X X or XX X etc Do not includ your answer Hint Use equipartition for a monatomic gas to calculate U and Sackur Tetrode to calculate S

37 The amount of heat required to raise the temperature of 1 mole of a monoatomic gas from 20 C to 30 C at constant volume is H Then the amount of heat required to raise the temperature of 2 mole of a diatomic gas from 20 C to 25 C at constant pressure is a 2H 4 b H 3 5 3 H 7 d H 3

16 An ideal gas mixture filled inside a balloon expand according to the relation pV2 3 constant The temperature inside the balloon is a increasing b decreasing c constant d Cannot be defined

a 8 J 23 A monoatomic gas is supplied the heat Q very slowly keeping the pressure constant The work done by the gas will be P 0Q 0 b Q a Q 3 wol c 2 0 Q d 1 1 Q W

The value of Cp C R for a gas in state A and Cp Cy 1 1R in other state B If P and PR denote the pressure and T and T are temperature in the two states then which of the following is correct B 1 PA PB TA TB 3 P P T T TA B 2 PA PB TA TB 4 P P T T A A B

1 A body is cooling under Newton s law of cooling Temperature difference between body and surrounding falls from 80 C to 40 C in 20 minute Time in which temperature difference between body and surrounding falls from 40 C to 10 C is 1 10 minute 2 20 minute 3 30 minute 4 40 minute

A monoatomic gas initially in state A PV is taken through a cyclic process ABCA as shown in the figure The pressure of point B is twice of that of A The curve BC is a rectangular hyperbola If the net work done by the gas is xPV then find the value of x A B

The value of Y 3 C V 759 5 3 7 577 for hydrogen helium and another ideal diatomic gas X whose molecules a not rigid but have an additional vibrational mode are respectively equal to 1 2 579 3 5 7 757