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MCQOPTIONS
This section includes 12583 Mcqs, each offering curated multiple-choice questions to sharpen your Joint Entrance Exam - Main (JEE Main) knowledge and support exam preparation. Choose a topic below to get started.
| 11351. |
Mercury boils at 367°C. However, mercury thermometers are made such that they can measure temperature up to 500°C. This is done by [CPMT 2004] |
| A. | Maintaining vacuum above mercury column in the stem of the thermometer |
| B. | Filling nitrogen gas at high pressure above the mercury column |
| C. | Filling nitrogen gas at low pressure above the mercury level |
| D. | Filling oxygen gas at high pressure above the mercury column |
| Answer» C. Filling nitrogen gas at low pressure above the mercury level | |
| 11352. |
At what temperature the centigrade (Celsius) and Fahrenheit, readings are the same [RPMT 1997, 99, 2003; BHU 1997; MNR 1992; DPMT 1998; CPMT 1995; UPSEAT 1999; KCET 2000] |
| A. | ? 40° |
| B. | + 40° |
| C. | 36.6° |
| D. | ? 37° |
| Answer» B. + 40° | |
| 11353. |
Absolute scale of temperature is reproduced in the laboratory by making use of a [SCRA 1998] |
| A. | Radiation pyrometer |
| B. | Platinum resistance thermometer |
| C. | Constant volume helium gas thermometer |
| D. | Constant pressure ideal gas thermometer |
| Answer» D. Constant pressure ideal gas thermometer | |
| 11354. |
The apparent coefficient of expansion of a liquid when heated in a copper vessel is C and when heated in a silver vessel is S. If A is the linear coefficient of expansion of copper, then the linear coefficient of expansion of silver is [EAMCET 1991] |
| A. | \[\frac{C+S-3A}{3}\] |
| B. | \[\frac{C+3A-S}{3}\] |
| C. | \[\frac{S+3A-C}{3}\] |
| D. | \[\frac{C+S+3A}{3}\] |
| Answer» C. \[\frac{S+3A-C}{3}\] | |
| 11355. |
The length of a metallic rod is 5m at 0°C and becomes 5.01 m, on heating upto 100°C. The linear expansion of the metal will be [UPSEAT 1999] |
| A. | 2.33 ´ 10?5 /°C |
| B. | 6.0 ´ 10?5 /°C |
| C. | 4.0 ´ 10?5 /°C |
| D. | 2.0 ´ 10?5 /°C |
| Answer» E. | |
| 11356. |
A cylindrical metal rod of length L0 is shaped into a ring with a small gap as shown. On heating the system |
| A. | x decreases, r and d increase |
| B. | x and r increase, d decreases |
| C. | x, r and d all increase |
| D. | Data insufficient to arrive at a conclusion |
| Answer» D. Data insufficient to arrive at a conclusion | |
| 11357. |
The volume of a metal sphere increases by 0.24% when its temperature is raised by 40°C. The coefficient of linear expansion of the metal is .......... °C [Kerala PMT 2005] |
| A. | 2 ´ 10?5 |
| B. | 6 ´ 10?5 |
| C. | 2.1 ´ 10?5 |
| D. | 1.2 ´ 10?5 |
| Answer» B. 6 ´ 10?5 | |
| 11358. |
Density of substance at 0°C is 10 gm/cc and at 100°C, its density is 9.7 gm/cc. The coefficient of linear expansion of the substance will be [BHU 1996; Pb. PMT 1999; DPMT 1998, 2003] |
| A. | 102 |
| B. | 10?2 |
| C. | 10?3 |
| D. | 10?4 |
| Answer» E. | |
| 11359. |
Water has maximum density at [Pb. PMT 1997] |
| A. | 0°C |
| B. | 32°F |
| C. | ? 4°C |
| D. | 4°C |
| Answer» E. | |
| 11360. |
When a bimetallic strip is heated, it [CBSE PMT 1990] |
| A. | Does not bend at all |
| B. | Gets twisted in the form of an helix |
| C. | Bend in the form of an arc with the more expandable metal outside |
| D. | Bends in the form of an arc with the more expandable metal inside |
| Answer» D. Bends in the form of an arc with the more expandable metal inside | |
| 11361. |
Three liquids of equal volumes are thoroughly mixed. If their specific heats are \[{{\operatorname{s}}_{1}},\,\,{{s}_{2}},\,\,{{s}_{3}}\] and their temperatures \[{{\theta }_{1}},{{\theta }_{2}},{{\theta }_{3}}\] and their masses \[{{\operatorname{m}}_{1}},\,\,{{m}_{2}},\,\,{{m}_{3}}\] respectively, then the final temperature of the mixture is |
| A. | \[\frac{{{s}_{1}}{{\theta }_{1}}+{{s}_{2}}{{\theta }_{2}}+{{s}_{3}}{{\theta }_{3}}}{{{m}_{1}}{{s}_{1}},\,\,{{m}_{2}}{{s}_{2}},\,\,{{m}_{3}}{{s}_{3}}}\] |
| B. | \[\frac{{{m}_{1}}{{s}_{1}}{{\theta }_{1}}+{{m}_{2}}{{s}_{2}}{{\theta }_{2}}+{{m}_{3}}{{s}_{3}}{{\theta }_{3}}}{{{m}_{1}}{{s}_{1}},\,\,{{m}_{2}}{{s}_{2}},\,\,{{m}_{3}}{{s}_{3}}}\] |
| C. | \[\frac{{{m}_{1}}{{s}_{1}}{{\theta }_{1}}+{{m}_{2}}{{s}_{2}}{{\theta }_{2}}+{{m}_{3}}{{s}_{3}}{{\theta }_{3}}}{{{m}_{1}}{{\theta }_{1}},\,\,{{m}_{2}}{{\theta }_{2}},\,\,{{m}_{3}}{{\theta }_{3}}}\] |
| D. | \[\frac{{{m}_{1}}{{\theta }_{1}}+{{m}_{2}}{{\theta }_{2}}+{{m}_{3}}{{\theta }_{3}}}{{{\operatorname{s}}_{1}}{{\theta }_{1}},\,\,{{\operatorname{s}}_{2}}{{\theta }_{2}},\,\,{{\operatorname{s}}_{3}}{{\theta }_{3}}}\] |
| Answer» C. \[\frac{{{m}_{1}}{{s}_{1}}{{\theta }_{1}}+{{m}_{2}}{{s}_{2}}{{\theta }_{2}}+{{m}_{3}}{{s}_{3}}{{\theta }_{3}}}{{{m}_{1}}{{\theta }_{1}},\,\,{{m}_{2}}{{\theta }_{2}},\,\,{{m}_{3}}{{\theta }_{3}}}\] | |
| 11362. |
Four identical rods of same material are joined end to end to form a square. If the temperature difference between the ends of a diagonal is\[100{}^\circ C\], then the temperature difference between the ends of other diagonal will be (where / is the length of each rod) |
| A. | \[0{}^\circ C\] |
| B. | \[\frac{100}{l}{}^\circ C\] |
| C. | \[\frac{100}{2l}{}^\circ C\] |
| D. | \[100{}^\circ C\] |
| Answer» B. \[\frac{100}{l}{}^\circ C\] | |
| 11363. |
A cylindrical rod of aluminum is of length 20 cm, and radius 2 cm. The two ends are maintained at temperatures of \[0{}^\circ C\] and \[50{}^\circ C\] [the coefficient of thermal conductivity is \[\frac{0.5\,cal}{cm\times sec{{\times }^{o}}C}\] ]Then the thermal resistance of the rod in \[\frac{cal}{sec{{\times }^{o}}C}\] |
| A. | 318 |
| B. | 31.8 |
| C. | 3.18 |
| D. | 0.318 |
| Answer» E. | |
| 11364. |
A kettle with 3 liter water at \[27{}^\circ C\] is heated by operating coil heater of power 2 kW. The heat is lost to the atmosphere at constant rate 130 J/sec, when its lid is open. In how much time will water heated to \[97{}^\circ C\] with the lid open? (specific heat of water =4.2kJ/kg) |
| A. | 472 sec |
| B. | 693 sec |
| C. | 912 sec |
| D. | 1101 sec |
| Answer» B. 693 sec | |
| 11365. |
The temperature of the two outer surfaces of a composite slab, consisting of two materials having coefficients of thermal conductivity K and 2K and thickness x and 4x, respectively, are\[{{\operatorname{T}}_{2}}\] and \[{{T}_{1}}\]\[({{\operatorname{T}}_{2}}>{{T}_{1}})\]. The rate of heat transfer through the slab, in a steady state is \[\left( \frac{A\left( {{\operatorname{T}}_{2}}>{{T}_{1}} \right)K}{x} \right)f\], with f equal to |
| A. | \[\frac{2}{3}\] |
| B. | \[\frac{1}{2}\] |
| C. | 1 |
| D. | \[\frac{1}{3}\] |
| Answer» E. | |
| 11366. |
The heat \[(Q)\] supplied to a solid, which is otherwise thermally isolated from its surroundings, is plotted as a function of its absolute temperature, \[\theta \]. It is found that they are related by the equation. \[Q=a\,{{\theta }^{2}}+b\,{{\theta }^{4}}\](a, b are constants). The heat capacity of the solid is given by |
| A. | \[a\frac{{{\theta }^{3}}}{3}+b\frac{{{\theta }^{5}}}{5}\] |
| B. | \[a\theta +b{{\theta }^{3}}\] |
| C. | \[a\frac{\theta }{3}+b\frac{{{\theta }^{3}}}{5}\] |
| D. | \[2a\theta +4b{{\theta }^{3}}\] |
| Answer» B. \[a\theta +b{{\theta }^{3}}\] | |
| 11367. |
In an energy recycling process, \[100\text{ }g\] of steam at \[100{}^\circ C\]becomes water at \[100{}^\circ C\] which converts y g of ice at \[0{}^\circ C\] into water at \[100{}^\circ C\]. The numeric value of y is |
| A. | 100 |
| B. | 200 |
| C. | 300 |
| D. | 400 |
| Answer» D. 400 | |
| 11368. |
An iron tyre is to be fitted on to a wooden wheel 1m in diameter. The diameter of tyre is 6 mm smaller than that of wheel. The tyre should be heated so that its temperature increases by a minimum of (the coefficient of cubical expansion of iron is\[3.6\times {{10}^{-5}}/{}^\circ C\]) |
| A. | \[167{}^\circ C\] |
| B. | \[334{}^\circ C\] |
| C. | \[500{}^\circ C\] |
| D. | \[1000{}^\circ C\] |
| Answer» D. \[1000{}^\circ C\] | |
| 11369. |
Consider two identical iron spheres, one which lie on a thermally insulating plate, while the other hangs from an insulating thread. Equal amount of heat is supplied to the two spheres |
| A. | temperature of A will be greater than B |
| B. | temperature of B will be greater than A |
| C. | their temperature will be equal |
| D. | can't be predicted |
| Answer» C. their temperature will be equal | |
| 11370. |
A steel rod of length 1 m is heated from \[25{}^\circ C\] to \[75{}^\circ C\] keeping its length constant. The longitudinal strain developed in the rod is (Given: Coefficient of linear expansion of steel \[=12\times {{10}^{-6}}/{}^\circ C\]) |
| A. | \[6\times {{10}^{-6}}\] |
| B. | \[-6\times {{10}^{-5}}\] |
| C. | \[-6\times {{10}^{-4}}\] |
| D. | zero |
| Answer» C. \[-6\times {{10}^{-4}}\] | |
| 11371. |
A mass of 50g of water in a closed vessel, with surroundings at a constant temperature takes 2 minutes to cool from \[30{}^\circ C\] to\[25{}^\circ C\]. A mass of 100g of another liquid in an identical vessel with identical surroundings takes the same time to cool from \[30{}^\circ C\] to \[25{}^\circ C\]. The specific heat of the liquid is: (The water equivalent of the vessel is 30g.) |
| A. | 2.0 kcal/kg |
| B. | 7 kcal/kg |
| C. | 3 kcal/kg |
| D. | 0.5 kcal/kg |
| Answer» E. | |
| 11372. |
A beaker contains 200 gm. of water. The heat capacity of the beaker is equal to that of 20 gm. of water. The initial temperature of water in the beaker is \[20{}^\circ C\]. If 440 gm. of hot water at \[92{}^\circ C\]is poured in it, the final temperature, neglecting radiation loss, will be nearest to |
| A. | \[58{}^\circ C\] |
| B. | \[68{}^\circ C\] |
| C. | \[73{}^\circ C\] |
| D. | \[78{}^\circ C\] |
| Answer» C. \[73{}^\circ C\] | |
| 11373. |
A pendulum clock is 5 seconds fast at temperature of \[15{}^\circ C\]and 10 seconds slow at a temperature of\[30{}^\circ C\]. At what temperature does it give the correct time? (take time interval = 24 hours) |
| A. | \[18{}^\circ C\] |
| B. | \[20{}^\circ C\] |
| C. | \[22{}^\circ C\] |
| D. | \[25{}^\circ C\] |
| Answer» D. \[25{}^\circ C\] | |
| 11374. |
A glass flask is filled up to a mark with 50 cc of mercury at \[18{}^\circ C\]. If the flask and contents are heated to \[38{}^\circ C\], how much mercury will be above the mark? (\[\alpha \] for glass is \[9\times {{10}^{-6}}/{}^\circ C\] and coefficient of real expansion of mercury is \[80\times {{10}^{-6}}/{}^\circ C\]) |
| A. | 0.85 cc |
| B. | 0.46 cc |
| C. | 0.153cc |
| D. | 0.05 cc |
| Answer» D. 0.05 cc | |
| 11375. |
A piece of metal weighs 45g in air and 25g in a liquid of density\[\text{1}\text{.5 }\!\!\times\!\!\text{ 1}{{\text{0}}^{\text{3}}}\,\text{kg - }{{\text{m}}^{\text{-3}}}\]kept at\[3{{0}^{\operatorname{o}}}C\]. When the temperature of the liquid is raised to\[40{}^\circ C,\], the metal piece weighs 27g. The density of liquid at\[40{}^\circ C\], is\[1.25\times 1{{0}^{3}}kg -{{m}^{-3}}\]. The coefficient of linear expansion of metal is |
| A. | \[1.3\times {{10}^{-3}}/{}^\circ C\] |
| B. | \[5.2\times {{10}^{-3}}/{}^\circ C\] |
| C. | \[2.6\times {{10}^{-3}}/{}^\circ C\] |
| D. | \[0.26\times {{10}^{-3}}/{}^\circ C\] |
| Answer» D. \[0.26\times {{10}^{-3}}/{}^\circ C\] | |
| 11376. |
An iron tyre is to be fitted on to a wooden wheel 1m in diameter. The diameter of tyre is 6 mm smaller than that of wheel. The tyre should be heated so that its temperature increases by a minimum of (the coefficient of cubical expansion of iron is \[3.6\times {{10}^{-5}})\] |
| A. | \[167{}^\circ C\] |
| B. | \[334{}^\circ C\] |
| C. | \[500{}^\circ C\] |
| D. | \[1000{}^\circ C\] |
| Answer» D. \[1000{}^\circ C\] | |
| 11377. |
A steel scale measures the length of a copper wire as \[80.0\,cm,\] when both are at \[20{}^\circ C\] (the calibration temperature for scale). What would be the scale read for the length of the wire when both are at \[40{}^\circ C\]? (Given asteel \[=11\times {{10}^{-6}}\]per°C and acopper \[=17\times {{10}^{-6}}per\,{}^\circ C\]) [CPMT 2004] |
| A. | \[80.0096\,cm\] |
| B. | \[80.0272\,cm\] |
| C. | \[1\,cm\] |
| D. | \[25.2\,cm\] |
| Answer» B. \[80.0272\,cm\] | |
| 11378. |
A diatomic ideal gas is heated at constant volume until the pressure is doubled and again heated at constant pressure until volume is doubled. The average molar heat capacity for whole process is: |
| A. | \[\frac{13R}{6}\] |
| B. | \[\frac{19R}{6}\] |
| C. | \[\frac{23R}{6}\] |
| D. | \[\frac{17R}{6}\] |
| Answer» C. \[\frac{23R}{6}\] | |
| 11379. |
Direction: An ideal diatomic gas is confined in a cylinder A of volume \[{{V}_{0}},\] this cylinder is connected to another cylinder B with the help of tube of a negligible volume. The cylinder B is fitted with a movable piston which can be adjusted from outside. Initially, the piston is adjusted so that volume of B is the same as volume of A i.e., \[{{V}_{0}}\]. B is evacuated and the stopcork is opened so that gas expands and occupies the volume \[2{{V}_{0}}\]. [System is thermally isolated from the surroundings]. Work done on the gas is [for n moles of gas] |
| A. | \[nRT\text{ }\ln \text{ }2\] |
| B. | \[-nRT\text{ }\ln \text{ }2\] |
| C. | \[nRT\] |
| D. | \[-nRT\] |
| Answer» B. \[-nRT\text{ }\ln \text{ }2\] | |
| 11380. |
Direction: An ideal diatomic gas is confined in a cylinder A of volume \[{{V}_{0}},\] this cylinder is connected to another cylinder B with the help of tube of a negligible volume. The cylinder B is fitted with a movable piston which can be adjusted from outside. Initially, the piston is adjusted so that volume of B is the same as volume of A i.e., \[{{V}_{0}}\]. B is evacuated and the stopcork is opened so that gas expands and occupies the volume \[2{{V}_{0}}\]. [System is thermally isolated from the surroundings].During this free expansion, the internal energy of the system. Now with the stop-cork open, the piston is slowly moved to compress the gas back to cylinder A at temperature T. For this |
| A. | increases |
| B. | decreases |
| C. | remains constant |
| D. | nothing can be said |
| Answer» D. nothing can be said | |
| 11381. |
The degrees of freedom per molecule of an ideal gas is 5. Work done by the gas is 100 J when it expands isobarically. The heat absorbed by the gas will be |
| A. | 250 J |
| B. | 150 J |
| C. | 350 J |
| D. | 200 J |
| Answer» D. 200 J | |
| 11382. |
An ideal gas can be expanded from an initial state to a certain volume through two different processes (i) \[P{{V}^{2}}=\] constant and (ii) \[P=K{{V}^{2}}\] where K is a positive constant. Then |
| A. | Final temperature in (i) will be greater then in (ii) |
| B. | Final temperature in (ii) will be equal to (i) |
| C. | Total heat given to the gas in (i) case is greater than in (ii) |
| D. | Total heat given to the gas in (ii) case is greater than in (i) |
| Answer» E. | |
| 11383. |
P.T graph of an ideal gas of equal number of moles of different volumes are plotted as shown. Choose the correct answer |
| A. | \[{{V}_{1}}={{V}_{2}}>{{V}_{3}}={{V}_{4}}\] |
| B. | \[{{V}_{1}}={{V}_{2}}<{{V}_{3}}={{V}_{4}}\] |
| C. | \[{{V}_{1}}={{V}_{2}}={{V}_{3}}={{V}_{4}}\] |
| D. | \[{{V}_{4}}>{{V}_{3}}>{{V}_{2}}>{{V}_{1}}\] |
| Answer» B. \[{{V}_{1}}={{V}_{2}}<{{V}_{3}}={{V}_{4}}\] | |
| 11384. |
An ideal refrigerator has a freezer at a temperature of \[-13{}^\circ C\]. The coefficient of performance of the engine is 5. The temperature of the air (to which heat is rejected) is. |
| A. | \[320{}^\circ C\] |
| B. | \[39{}^\circ C\] |
| C. | 325 K |
| D. | \[325{}^\circ C\] |
| Answer» C. 325 K | |
| 11385. |
DIRECTION: Read the passage given below and answer the questions that follows: In the figure n mole of a monoatomic ideal gas undergo the process ABC as shown in the P-V diagram. The process AB is isothermal and BC is isochoric. The temperature of the gas at A is \[{{T}_{0}}\]. Total heat given to the gas during the process ABC is measured to be Q. The average molar heat capacity of the gas in process ABC |
| A. | \[\frac{Q}{n{{T}_{0}}}\] |
| B. | \[\frac{Q}{2n{{T}_{0}}}\] |
| C. | \[\frac{Q}{3n{{T}_{0}}}\] |
| D. | \[\frac{2Q}{n{{T}_{0}}}\] |
| Answer» C. \[\frac{Q}{3n{{T}_{0}}}\] | |
| 11386. |
DIRECTION: Read the passage given below and answer the questions that follows: In the figure n mole of a monoatomic ideal gas undergo the process ABC as shown in the P-V diagram. The process AB is isothermal and BC is isochoric. The temperature of the gas at A is \[{{T}_{0}}\]. Total heat given to the gas during the process ABC is measured to be Q. Heat absorbed by the gas in the process BC |
| A. | \[3nR{{T}_{0}}\] |
| B. | \[nR{{T}_{0}}\] |
| C. | \[2nR{{T}_{0}}\] |
| D. | \[6nR{{T}_{0}}\] |
| Answer» B. \[nR{{T}_{0}}\] | |
| 11387. |
DIRECTION: Read the passage given below and answer the questions that follows: In the figure n mole of a monoatomic ideal gas undergo the process ABC as shown in the P-V diagram. The process AB is isothermal and BC is isochoric. The temperature of the gas at A is \[{{T}_{0}}\]. Total heat given to the gas during the process ABC is measured to be Q. Temperature of the gas at C is equal to |
| A. | \[{{T}_{0}}\] |
| B. | \[3{{T}_{0}}\] |
| C. | \[6{{T}_{0}}\] |
| D. | \[2{{T}_{0}}\] |
| Answer» C. \[6{{T}_{0}}\] | |
| 11388. |
Choose the correct statement for an isolated system. |
| A. | \[\Delta U(C\to D)=\] negative |
| B. | \[\Delta Q(A\to B)=\] positive |
| C. | \[\Delta U=(A-B-C-D-A)\ne 0\] |
| D. | \[\Delta Q(D\to A)=0\] |
| Answer» E. | |
| 11389. |
Two carnots engines A and B are operated in series. The first one A receives heat at 1200 K and rejects to a reservoir at T and K. The second engine B receives the heat rejected by the first engine and in turn rejects to a heat reservoir at 300 K. Calculate the value of T, when work outputs of the two engines are equal. |
| A. | 600 K |
| B. | 750 K |
| C. | 450 K |
| D. | 900 K |
| Answer» C. 450 K | |
| 11390. |
An ideal monoatomic gas is confined in a cylinder, fitted with piston, which is connected to spring as shown in figure. The gas is heated by a-small electric heater until the piston moves out slowly by 0.1 m. Find the work done by the gas. Spring constant = 8000 N/m,-piston area \[=8\times {{10}^{-3}}{{\text{m}}^{2}}\] atmospheric pressure \[={{10}^{5}}Pa\]. |
| A. | 40 J |
| B. | 80 J |
| C. | 120 J |
| D. | 60 J |
| Answer» D. 60 J | |
| 11391. |
In isothermal expansion, the pressure is determined by |
| A. | Temperature only |
| B. | Compressibility only |
| C. | Both temperature and compressibility |
| D. | None of these |
| Answer» C. Both temperature and compressibility | |
| 11392. |
In an isothermal expansion |
| A. | Internal energy of the gas increases |
| B. | Internal energy of the gas decreases |
| C. | Internal energy remains unchanged |
| D. | Average kinetic energy of gas molecule decreases |
| Answer» D. Average kinetic energy of gas molecule decreases | |
| 11393. |
The state of a thermodynamic system is represented by |
| A. | Pressure only |
| B. | Volume only |
| C. | Pressure, volume and temperature |
| D. | Number of moles |
| Answer» D. Number of moles | |
| 11394. |
When heat is given to a gas in an isothermal change, the result will be |
| A. | External work done |
| B. | Rise in temperature |
| C. | Increase in internal energy |
| D. | External work done and also rise in temp. |
| Answer» B. Rise in temperature | |
| 11395. |
A thermally insulated container is divided into two parts by a screen. In one part the pressure and temperature are P and T for an ideal gas filled. In the second part it is vacuum. If now a small hole is created in the screen, then the temperature of the gas will |
| A. | Decrease |
| B. | Increase |
| C. | Remain same |
| D. | None of the above |
| Answer» D. None of the above | |
| 11396. |
One mole of \[{{O}_{2}}\] gas having a volume equal to 22.4 litres at \[{{0}^{o}}C\] and 1 atmospheric pressure in compressed isothermally so that its volume reduces to 11.2 litres. The work done in this process is |
| A. | \[1672.5\ J\] |
| B. | 1728 J |
| C. | \[-1728J\] |
| D. | \[-1572.5\ J\] |
| Answer» E. | |
| 11397. |
In a thermodynamics process, pressure of a fixed mass of a gas is changed in such a manner that the gas releases 20 J of heat and 8J of work is done on the gas. If the initial internal energy of the gas was 30J. The final internal energy will be |
| A. | 18J |
| B. | 9J |
| C. | 4.5J |
| D. | 36J |
| Answer» B. 9J | |
| 11398. |
The specific heat of hydrogen gas at constant pressure is \[{{C}_{P}}=3.4\times {{10}^{3}}cal/kg{{\,}^{o}}C\] and at constant volume is \[{{C}_{V}}=2.4\times {{10}^{3}}cal/kg{{\,}^{o}}C.\]If one kilogram hydrogen gas is heated from \[{{10}^{o}}C\] to \[{{20}^{o}}C\] at constant pressure, the external work done on the gas to maintain it at constant pressure is |
| A. | \[{{10}^{5}}\,\]cal |
| B. | \[{{10}^{4}}\]cal |
| C. | \[{{10}^{3}}\] cal |
| D. | \[5\times {{10}^{3}}\]cal |
| Answer» C. \[{{10}^{3}}\] cal | |
| 11399. |
In thermodynamic process, 200 Joules of heat is given to a gas and 100 Joules of work is also done on it. The change in internal energy of the gas is |
| A. | 100 J |
| B. | 300 J |
| C. | 419 J |
| D. | 24 J |
| Answer» C. 419 J | |
| 11400. |
A system performs work \[\Delta W\] when an amount of heat is \[\Delta Q\] added to the system, the corresponding change in the internal energy is \[\Delta U\]. A unique function of the initial and final states (irrespective of the mode of change) is |
| A. | \[\Delta Q\] |
| B. | \[\Delta W\] |
| C. | \[\Delta U\] and \[\Delta Q\] |
| D. | \[\Delta U\] |
| Answer» E. | |