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第1卷(选择题50分) 一、选择题:本大题共25小题,每小题2分,共50分。在每小题给出的四个选项中,只有一项是符合题意的。 1.关于重力的方向,下列说法中正确的是: (A)物体所受重力的方向总是垂直向下. (B)物体所受重力的方向总是竖直向下. (C)物体所受重力的方向总是跟支持重物的支持面垂直. (D)物体所受重力的方向总是跟支持面对物体的弹力方向相反. 2.浮在水面上的薄油层,在太阳光的照射下会呈现各种不同颜色,这种现象是: (A)光的干涉现象. (B)光的漫反射现象. (C)光的全反射现象.
Volume 1 (Multiple-choice 50 points) 1. Multiple-choice questions: There are a total of 25 small questions in this big question, with 2 points for each question and a total of 50 points. Of the four options given in each question, only one is consistent. 1. With respect to the direction of gravity, the following are correct: (A) The direction of gravity of an object is always perpendicular downward. (B) The direction of gravity of an object is always vertical downward. (C) The object The direction of gravity is always perpendicular to the supporting surface supporting the weight. (D) The direction of the gravity of the object is always opposite to the direction of the elastic force of the supporting surface. 2. The thin oil layer floating on the surface of the water, in the sunlight Under illumination, various colors will appear. This phenomenon is: (A) Interference of light. (B) Diffuse reflection of light. (C) Total reflection of light.