Physics question and answers for February 18, 2024
- Q An ideal monatomic gas undergoes expansion according to law P aV where a is a constant Molar heat capacity of the gas in the process is 1 3 R 2...
- Q c 9000 J d 9800 J 74 Six moles of an ideal gas performs a cycle shown in figure If the temperatures are T 600 K T 800 K Tc...
- Q shown in the figure PA 3 2 V gas is 1 The temperature of the gas increases from 1 to 2 2 The temperature of the gas decreases from 1...
- Q Mixture enclosed in a vessel of volume V 5 consists of 1 mole of a gas A with y 3 7 5 gas with y at a temperature T The...
- Q Illustration 11 Two gram mole of a gas which are kept at constant temperature of 0 C are compressed from 4 liter to 1 liter The work done will be
- Q Illustration 9 5 gm air is heated from 4 C to 6 C If the specific heat of air at constant volume is 0 172 cal gm C then increase...
- Q Illustration 13 One liter of air at NTP is suddenly compressed to 1 c c the final pressure will be
- Q Illustration 8 A gas whose y 4 3 is heated at constant pressure How much percent of given heat is used in external work done
- Q 1 10 gm of ice at 0 C is kept in a calorimeter of water equivalent 10 gm How much heat should be supplied to the apparatus to evaporate the...
- Q The graph shown in the figure represents energy density Ex versus for three sources sun welding arc tungsten filament A 1 Tungsten 2 Welding arc 3 Sun B 1 Sun...
- Q In a dark room with ambient temperature To a black body is kept at a temperature T Keeping the temperature of the black body constant at T sunrays are allowed...
- Q The room heater can provide only 16 C in the room when the temperature outside is 20 C It is not wa and comfortable that is why the electric stove...
- Q When the centre of earth is at a distance of 1 5 x 1011 m from the centre of sun the intensity of solar radiation reaching at the earth s...
- Q An ideal gas undergoes a quasi static reversible process in which its molar heat capacity C remains constant If during this process the relation of pressure P and volume V...
- Q The work done by the one mole gas in the cyclic process shown in graph is W Then VE T To A T T T 2 B To W T...
- Q Example 15 36 Temperature of a 5 mole of hydrogen gas decreases by 260 K while expanded through adiabatic process Find the work done by the gas What is the...
- Q The specific heat of alcohol is about half that of water Suppose you have identical masses of alcohol and water The alcohol is initially at temperature TA The water is...
- Q Como f 1 10 g of ice at 0 C is kept in a calorimeter of water equivalent 10 g How much heat should be supplied to the apparatus to...
- Q The change in entropy of 1 kg of nitrogen gas in an isobaric process when its temperature changes from 400 K to 800 K is 1 720 J K 3...
- Q An ideal diatomic gas undergoes a thermodynamic process as shown on indicator P V diagram The heat input during process a to b is PA AP 2Pa 1 12 PV...
- Q 2 A reversible engine absorbs 600 J of heat from source at 627 C and rejects some heat to the sim at 27 C The heat rejected to the sink...
- Q 27 A monatomic ideal gas undergoes thermodynamic process as shown in the figure The molar specific heat of the process is 1 R 3 2 3 75 R VA T...
- Q A 50 gm lead bullet specific heat 0 02 cal gm is initially at 30 C It is fired vertically up speed of 840 m sec on returning to the...
- Q two process I and II as shown PA b V The heat absorbed and work done in process I are 100 J and 80 J respectively If work done in...
- Q 1gm of H at S T volume occupie 0 7m of Hg will ti 1 40 1 lit 3 46 6 lit occupies 11 2 litre The y 3gm of...
- Q 1 kg of water at 373 K is converted into steam at same temperature Volume of 1 cm of water becomes 1671 cm on boiling What is the change in...
- Q Two cylinders A and B of equal capacity are connected to each other via a stop cock A contains an ideal gas at standard temperature and pressure B is completely...
- Q Two Carnot engines A and B are operated in series The first one A receives heat at T 600 K and rejects to a reservoir at temperature T The second...
- Q In adiabatic process volume of monoatomic gas increases by 6 then find percentage change in temperature 1 2 3 2 2 4 4 4
- Q 51 In an energy recycling process X g of steam at 100 C becomes water at 100 C which converts Y g of ice at 0 C into water at...
- Q A vessel contains 5 mole of O The system is given heat at constant pressure As a result the gas expands and does 120 J of work The heat supplied...
- Q g ice cube is dropped into 45 g of water kept in a glass If the water was initially at a temperature of 28 C and the temperature of ice...
- Q Consider two insulated chambers A B of same volume connected by a closed knob S 1 mole of perfect gas is confined in chamber A What is the change in...
- Q 6 A fixed amount of an ideal monoatomic gas is taken through the cycle ABCD as shown in the figure The efficiency of the cycle will be P 3P Po...
- Q One kg of a diatomic gas is at a pressure of 8x104 N m The density of the gas is 4 kg m What is the energy of the gas...
- Q A Carnot s reversible engine converts of heat input 6 into work When the temperature of the sink is reduced by 62 K the efficiency of Camot s cycle becomes...
- Q 3 10 8 To decrease the pressure of the gas by 10 at constant temperature then change in volume should be 1 10 decrease 3 11 11 increase 2 10...
- Q 63 A gas at a temperature 300 K and pressure 30 atm is allowed to expand to atmospheric pressure If the volume becomes 10 times its initial volume the final...
- Q A gaseous mixture contains equal number of hydrogen and nitrogen molecules Specific heat measurements on this mixture at temperatures below 100 K would indicate that the value of y ratio...
- Q 9 A system is taken from state a to state c by two paths adc and abc as shown in the figure The internal energy at a is U 10...
- Q 49 Curve between the rate of cooling R and body temperature 0 plotted on Y and X axes respectively is Y Y 1 0 3 Y X 2 O 4...
- Q How does the pressure of an ideal gas change during the process shown in the diagram V a b T 1 Pressure increases continuously 2 Pressure decreases continuously 3 Pressure...
- Q 5 The average degrees of freedom per molecule for a gas is 6 The gas performs 25J of work when it expands at constant pressure The heat absorbed by gas...
- Q 200 g of water at 50 C 100 g ice at 20 C and 20 g steam at 100 C are added together in a thermally insulating vessel It is...
- Q 3 70 A given amount of a gas heated till the volume and pressure are each increased by 1 then temperature increases by 1 0 5 2 1 3 2...
- Q The specific heat capacity of a metal at low temperature 7 is given as T 400 A 100 gram vessel of this metal is to be cooled from 20 K...
- Q Dha h h 1 10 1 16 m or In the Pressure versus Volume graph shown in the process of going from a to b 60 J of heat is...
- Q 36 The time of reverberation of a room A is one second What will be the time in seconds of reverberation of a room having all the dimensions double of...
- Q Comprehension Q 6 to Q 8 A simple heat engine consists of a movable piston in a cylinder filled with an ideal monoatomic gas Initially the pressure reaches 32P the...
- Q 5 An ideal gas is taken through a process as shown in the figure It absorbs 100 J of energy during the process AB No heat is absorbed or rejected...
- Q A 2kW resistance heater wire whose thermal conductivity is K 15 w m k has a diameter of D 4 mm and a length of L 0 5 m and...
- Q An ideal gas at 27 C is compressed adiabatically to 8 27 of its original volume The rise in temperature is take y 5 3 a 475 C c 275...
- Q Let P V and T denote respec volume and temperature of an ideal gas The correct graph for adiabatic process is 1 3 TAV dP V TOP dP TOV 28...
- Q 5 Reversible expansion of an ideal gas under isothermal and adiabatic conditions are as shown in the figure P A PA VA TA B PB VB TB C Pc Vc...
- Q In an adiabatic process if pressure P and density d of a monatomic gas are related as P is proportional to dx then x is equal to 1 3 275...
- Q 18 The pressure P versus volume V of an ideal gas varies as shown in the given figure Which of the following graph may represent the variation of pressure P...
- Q done by gas is P 200 kPa 100 kPa 1 5 kJ 3 5 kJ D 100 cc C iB 200 cc V 2 2 5 kJ 4 7 5...
- Q 8 A closed system undergoes a change of state by process 1 2 for which Q12 10J and W12 5 J The system is now returned to its initial state...
- Q Find the ratio of the lengths of an iron rod and an aluminium rod for which the difference in the lengths is independent of temperature Coefficients of linear expansion of...
- Q An ideal refrigerator has a freezer at temperature 12 C The coefficient of performance temperature of the engine is 5 The of the air to which the heat ejected is...
- Q A spherical soap bubble surface tension S encloses n moles of mono atomic gas The gas is heated slowly so that the effective surface area of the bubble increases by...
- Q When one mole of monoatomic gas expands at constant pressure the ratio of the heat supplied that increases the internal energy of the gas and that is used in expansion...
- Q During an adiabatic process the pressure of a gas is found to be proportional to the cube of its temperature a 2 c 3 2 Cp The ratio of for...
- Q Figure shown below is a graph of a monoatomic gas which undergoes a cyclic process If work done by gas in process BC is x the heat absorbed in process...
- Q Two moles of Helium gas undergoes a cyclic process as shown in figure Assume gas to be ideal The net change in heat energy is P atm 2 L 1...
- Q 0 100 mol of an ideal gas is heated from 10 to 20 C keeping its a volume constant b pressure constant Let AU and AU denote the change in...
- Q 29 What is the volume occupied by one mole of an ideal gas at STP a 10 4 L c 22 4 L b d 11 4 L 33 4...
- Q 3 A gas is taken along the path AB as shown in figur 26 E8 If 70 cal of heat is extracted from the gas in the 250 cc 100...
- Q An experiment is being performed by a student in laboratory on ideal gas He found the value of Cp Cy equal to 1 00 R for a gas sample in...
- Q 1 r 3 5 2 r 4 r4 A sample of 0 1 g of water at 100 C and normal pressure 1 013 x 105 Nm 2 requires 54...
- Q 56 Two different masses of a gas separately in vessels of equal volume The T p curve for mass 2m makes angle a with T axis and that for mass...
- Q Carnot Theorem No heat engine operating between two given temperatures can be more efficient than a Carnot engine operating between the same two temperatures
- Q 1 The pressure 1x 10 Nm2 of the air filled in a vessel is decreased adiabatically so much as to increase its volume three times The air pressure is y...
- Q 3 One mole of an ideal monoatomic gas at temperature To 0 P V expands slowly according to the law constant If the final temperature is 27 heat supplied to...
- Q A ideal gas whose adiabatic exponent equals y is expanded so that the amount of heat transferred to the gas is equal to twice of decrease of its internal energy...
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