# 2015 AP Physics 2物理Algebra-Based真题系列之Practice Exam选择题免费下载

### 真题与答案下载 ### 2015 AP 物理2模考选择题部分免费下载

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18）Assume the capacitance C of the capacitor is known. The gap between the capacitor's plates is now filled with an unknown insulating material, and the circuit is again left connected for a long time. Measuring which of the following provides enough information to determine the unknown material's dielectric constant K?

1. The potential difference across the capacitor and the current in each branch of the circuit
2. The potential difference across the capacitor and the charge on one of its plates
3. The potential difference across the capacitor and the charge on the dielectric material
4. The separation between the capacitor plates and the area of the plates

24）Two containers, each holding a different gas, are brought into thermal contact. The gas atoms in container X have twice the mass and half the average speed of the gas atoms in container Y. Which of the following best describes the energy transfer by thermal conduction, if any, between the two containers?

1. There is a net energy transfer from container X to container Y
2. There is a net energy transfer from container Y to container X
3. There is no net energy transfer between the containers, because no atoms move between them
4. There is no net energy transfer between the containers, because energy is transferred at approximately equal rates in each direction

25）A group of students wants to determine the internal resistance of a battery. They connect the battery to a variable resistor. The students measure the potential difference across the battery as a function of the current through the battery as they vary the resistance. Which of the following analyses of the data could be used to determine the internal resistance of the battery?

1. Divide the potential difference across the battery by the current through it for each data point. The average of these calculations gives the internal resistance of the battery.
2. Graph the potential difference across the battery as a function of the current through it. Extrapolate to find the y-intercept and divide this by the average of the current measurements to find the internal resistance of the battery.
3. Find the best-fit straight line for a graph of potential difference across the battery as a function of the current through it. The absolute value of the slope represents the inetrnal resistance of the battery.
4. This data cannot be analyzed to give the internal resistance of the battery, because the potential difference across the battery does not depend on the current.