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Physical Science 100questions and answers

Questions & Answers  1. What is the best description of sound waves? A. A source vibrates up and down, causing air molecules to move up and down perpendicular to the direction the wave is transmitted. B. A source vibrates back and forth, causing air molecules to move back and forth in the same direction that the wave is transmitted. C. A source vibrates up and down and back and forth, causing air molecules to move in a circular motion as the wave is transmitted. D. A source ejects ...

GCSE examinations are marked in such a way as to award positive achievement wherever possible. Thus, for GCSE Mathematics papers, marks are awarded under various categories. If a student uses a method which is not explicitly covered by the mark scheme the same principles of marking should be applied. Credit should be given to any valid methods. Examiners should seek advice from their senior examiner if in any doubt. M Method marks are awarded for a correct method which could lead to a corr...

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