2020 Physics II(电子科技大学) 最新满分章节测试答案

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本课程起止时间为:2020-09-10到2021-01-10

Chapter 18 Second Law of Thermodynamics (2) Chapter 15~18 Test

1、 问题:There are two same test tubes A and B. Tube A is heated at one end, and the temperature in A is changing from 900K to 300K uniformly. Gas in tube B has a constant temperature 600K. Compare the number of moles of gas in A and B.
选项：
A:A>B
B:A=B
C:A<B
D:It depands on other condition.
答案: 【A>B】

2、 问题:About the internal energy of a certain ideal gas system, which of the following statement is correct?
选项：
A:It does not depend on how many moles of gas are in the system.
B:It depends only on the temperature of the gas, and not on pressure or volume.
C:It depends on the volume of the gas.
D:It depends on the pressure of the gas.
答案: 【It depends only on the temperature of the gas, and not on pressure or volume.】

3、 问题:The most probable speed of an ideal gas system can be expressed as
选项：
A:
B:
C:
D:
答案: 【】

4、 问题:As shown in figure, a fixed amount of ideal gas changes from equilibrium state A to B (Pa=Pb). Which of the following statement is true?
选项：
A:The internal energy is increased.
B:The system must do positive work during any process from state A to B.
C:This system need to absorb heat from environment.
D:This system need to release heat into environment.
答案: 【The internal energy is increased.】

5、 问题:Cylinder A contains Oxygen (O2) gas, and cylinder B contains Nitrogen (N2) gas. If the molecules in the two cylinders have the same root-mean-square (rms) speeds, which of the following statements is NOT correct?
选项：
A:The two gases have different temperatures.
B:The average kinetic energy of the nitrogen molecules is less than the average kinetic energy of the oxygen molecules.
C:The molecules in the two cylinders also have the same average speeds.
D:The temperature of cylinder B is greater than the temperature of cylinder A.
答案: 【The temperature of cylinder B is greater than the temperature of cylinder A.】

6、 问题:About Carnot cycle, which of the following statements is TRUE?
选项：
A:It is an example of an irreversible process that can be analyzed exactly without approximation.
B:Its efficiency can be 100%.
C:Its efficiency depends only on the absolute temperature of the hot reservoir used.
D:No engine can be more efficient than a Carnot engine operating between the same two temperatures.
答案: 【No engine can be more efficient than a Carnot engine operating between the same two temperatures.】

7、 问题:1mol Hydrogen gas and 1mol Oxygen gas have the same volume V, if they are both at 20℃ and 1.5atm pressure.
选项：
A:正确
B:错误
答案: 【正确】

8、 问题:In ideal gas model, all the molecules move in the same directions with a variety of speeds.
选项：
A:正确
B:错误
答案: 【错误】

9、 问题:If the temperature of a gas system changes from 300℃ to 600℃, the average translational kinetic energy of molecules changes from E to 2E.
选项：
A:正确
B:错误
答案: 【错误】

10、 问题:Maxwell distribution of speeds tells us that there are fewer molecules with high speed than molecules with low speed.
选项：
A:正确
B:错误
答案: 【错误】

11、 问题:In a cyclic process, the total heat added to the system equals to the total work done by the system in a entire cycle.
选项：
A:正确
B:错误
答案: 【正确】

12、 问题:On a P-V diagram, an isothermal curve is steeper than an adiabatic curve if they have an intersection point.
选项：
A:正确
B:错误
答案: 【错误】

13、 问题:We can not 100% transform heat into work without other effects, because that violates the first law of thermodynamics.
选项：
A:正确
B:错误
答案: 【错误】

14、 问题:If 1kg water at 20℃ is mixed with 1kg water at 80℃, the entropy of entire system increases.
选项：
A:正确
B:错误
答案: 【正确】

15、 问题:
答案: 【[260,270]】

16、 问题:Curves of the Maxwell distribution function for a fixed amount of ideal gas at temperature Ta and Tb are shown in figure. The temperature of __(a or b) is higher.
答案: 【b】

17、 问题:A Carnot engine  operates between two reservoirs at 20.0 ℃ and 500 ℃, How much is the efficiency?  e=____% 
答案: 【[62,62.2]】

18、 问题:Calculate the root-mean-square (rms) speed of helium (He) atoms near the surface of the Sun at a temperature of 6000K. (Universal gas constant R=8.31J/(mol·K))Vrms=______m/s
答案: 【[6100,6120]】

19、 问题:0.1mol O2  gas is filled in a container with temperature 27 ℃. (Universal gas constant R=8.31J/(mol·K))The internal energy of gas is _____J. 
答案: 【[620,625]】

20、 问题:How much is the adiabatic coefficient for methane gas (CH4)?γ=_______.
答案: 【[1.3,1.34]】

21、 问题:A monatomic (1-atom) gas system goes through a cyclic process abca. How much is the total heat transfer to the system in a cycle?Q=_____J
答案: 【200】

Chapter 22 Capacitance; Dielectrics; Electric Energy Storage (2) Chapter 19~22 Test

1、 问题:What happens when a charged insulator is placed near an uncharged metallic object?
选项：
A:They attract each other.
B:They repel each other.
C:They may attract or repel each other, depending on whether the charge on the insulator is positive or negative.
D:They exert no electrostatic force on each other.
答案: 【They attract each other.】

2、 问题:About Gauss’s law, which of the following statements is TRUE?
选项：
A:If the electric flux through a closed surface is zero, there must be no charge inside the closed surface.
B:If there is no charge inside the surface, the electric field inside the surface is zero.
C:If the electric field inside the closed surface is uniform, there is no charge inside the closed surface.
D:If there is no net charge inside the surface, the electric field over the enclosed surface must be zero.
答案: 【If the electric field inside the closed surface is uniform, there is no charge inside the closed surface.】

3、 问题:About the electric fluxes Φe through each gaussian surface shown in the figure, which of the rankings is correct?
选项：
A:
B:
C:
D:
答案: 【】

4、 问题:Which of the following figures about field line can represent an electrostatic field in real world?
选项：
A:Figure A
B:Figure B
C:Figure C
D:Figure D
答案: 【Figure C】

5、 问题:If three unequal capacitors, initially uncharged, are connected in series across a battery, which of the following statements is TRUE? 
选项：
A:The largest voltage appears across the smallest capacitance.
B:The capacitor with the largest capacitance has the greatest charge.
C:The equivalent capacitance is greater than any of the individual capacitances. 
D:None of the others is true.
答案: 【The largest voltage appears across the smallest capacitance.】