竞赛卷（Competition roll）.doc

竞赛卷（Competition roll） 1. place the best place for the camphor ball in the wardrobe. The correct answer is () A. upper layer, B. lower, C. middle, D. are the same 2. the process of boiling water into a thermos flask allows you to judge the water level in the pot because of the sound A. as the water rises, the pitch rises gradually. B. as the water level rises, the tone gradually decreases. C. during irrigation, the tone remains constant and the sound becomes larger. D. during irrigation, the tone remains constant and the sound becomes smaller. 3. color TV screen, showing a variety of colors, are composed of 3 basic colors mixed, and these 3 basic colors are () A. red, orange, yellow, B., yellow, green, blue, C., orange, indigo, purple, D., green, red and blue 4. coach after long time running, the driver often stopped to take a beating with iron wheels, want to sound to determine the adequacy of the air in the tire. This is mainly due to the sound of air when the tires are enough A. has larger loudness, higher B. tone, lower C. tone, and smaller D. loudness 5. on a clear summer day, water is often burned on the leaves of trees or flowers. The reason is () A. water droplets evaporate, take away the leaves of heat, B. water droplets rise in the sun, Ye Tangjiao C. water droplets pass through sunlight easily. D. water droplets cause sunlight to converge and burn leaves 6. oiled leather shoes, but also with brush or soft cloth rub a few, more and more bright, this is due to () A. repeated wiping can increase the diffuse effect B. repeated rubbing can make shoe polish fill in the blanks of leather surface, increase the smoothness of the surface and increase the effect of mirror reflection C. shoe polish reflects better than leather shoes. Repeated wiping can evenly distribute shoe polish and increase the effect of mirror reflection D. shoe polish is better in color than leather, which increases the specular effect 7. someone stands in front of a circular cylinder wrapped i