Directions: Read each question carefully. Write the letter of the correct answer on the answer sheet on page 9. 1. How does light travel? Light travels in a A. circle B. wavy line C. curve line D. straight line 2. In which materials does sound travel fastest? A. air B. empty space C. metal D. water 3. Why does sound travel faster in solids than in gases? A. Gas molecules move slowly. B. Gas molecules are packed tightly. C. Solid molecules are packed tightly. D. Solid molecules move slowly. 4. How does the vibration of particles occur when sound travels in solids? A. fast B. irregularly C. moderately D. slowly 5. What affects the speed of sound as it travels? A. the medium through which it travels B. the matter through which it travels C. the space through which it travels D. the time through which it travels​