【PHYS】2018 DSE Paper 1A (MC) suggested answer

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MC卷 (not available yet）

答案

  1-5:             B*ADAA

  6-10:            CBAAD

  11-15:          BACDC

  16-20:          BDCBD

  21-25:          CACBA

  26-30:          CCDDD

  31-33:          DBA

Explanation

Note: 

Q1 may be cancelled due to lack of discriminatory power as the explanation of the location of silver coating is way out of DSE syllabus. Most candidates will simply blind guess. 

Q30  D but not B:

Indeed the voltage across the branch with xy included is 6V. However, all the pd of the branch will be taken up by the upper half of resistor which is connected to x, and the xy itself, being the remaining part of the branch, should share no pd.

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