Alignment between content standards and standardized tests is a significant issue to society, science pedagogy, and test validation. To better understand the issues related to alignment, this study compares the alignment in physics among three education systems: Jiangsu (China), New York State (United States), and Singapore. The same coding framework for content standards and standardized tests is used to compute the alignment indices in the three education systems. It was found that there was a statistically significant alignment between the New York content standard and the standardized test for physics, but there was not a statistically significant alignment for Chinese and Singapore physics. The insignificant alignment for Chinese and Singapore physics was due to a shift toward higher level cognitive reasoning skills from content standards to standardized tests. For Chinese physics, the insignificant alignment was also due to a heavier emphasis on electricity in the test than in the content standard. Both significant and insignificant alignments may result in desirable and undesirable effects on guiding classroom instruction. Thus, ongoing study of the alignment between a science content standard and the standardized test is necessary for any education system, and alignment studies may be used as a means of teacher professional development for improving student achievement. (Contains 5 tables and 7 figures.)