In an experiment, if the independent variable is changed, what might also change? A. Dependent variable B. Control variable C. Constant variable 相关知识点: 试题来源: 解析 A。理解科学实验中的变量关系,自变量改变可能导致因变量改变,答案是 A。
A. The variable that is changed by the experimenter. B. The variable that changes in response to the independent variable. C. The variable that is kept the same. D. The variable that is not important. 相关知识点: 试题来源: 解析 A。在实验中,自变量是由实验者改变的变量。选项 B 是因变量...
In an experiment, Tom put a candle under a glass. What happened after a while? A. The candle burned faster. B. The candle went out. C. The glass broke. D. The candle got bigger. 相关知识点: 试题来源: 解析 B。解析:蜡烛在玻璃下燃烧,过一会儿会因为缺少氧气而熄灭。A 选项燃烧更快不...
In an experiment, we observe that a substance changes color. What might this indicate? A. A chemical reaction has occurred B. The substance has evaporated C. The substance has solidified D. The substance has melted 相关知识点: 试题来源: 解析 A。解析:物质颜色发生变化通常表明发生了化学反应;...
In the experiment, if a certain variable is changed, what will happen to the results? A. Remain unchanged. B. Become more accurate. C. Be unpredictable. D. Be affected. 相关知识点: 试题来源: 解析 D。解析:在实验中如果某个变量改变,结果会受到影响。A 选项保持不变错误;B 选项变得更准确...
In an experiment,we shine a flashlight on a mirror.What happens? A. The light passes through the mirror. B. The light is reflected by the mirror. C. The mirror breaks. 相关知识点: 试题来源: 解析 B。当用手电筒照镜子时,光会被镜子反射。选项 A 光穿过镜子错误。选项 C 镜子破碎不符合...
A. A chemical reaction is taking place. B. The metal is evaporating. C. The acid is solidifying. D. The bubbles are from the air. 相关知识点: 试题来源: 解析 A。金属与酸反应会产生气泡,这是化学反应。金属不会蒸发;酸不会固化;气泡不是来自空气。本题考查化学反应的概念。反馈 收藏 ...
In an experiment, if you change the temperature, what is the temperature? A. Dependent variable. B. Independent variable. C. Control variable. D. Unknown variable. 相关知识点: 试题来源: 解析 B。在实验中,如果改变温度,温度是自变量。因为温度是由实验者改变的。选项 A 因变量是随着自变量变化而...
What is this process called? A. melting B. freezing C. boiling D. evaporating 相关知识点: 试题来源: 解析 A。选项 A“melting”是融化,固体变为液体;选项 B“freezing”是凝固,液体变为固体;选项 C“boiling”是沸腾;选项 D“evaporating”是蒸发,液体变为气体。反馈 收藏 ...
C. The time of day the experiment is conducted. D. The age of the participants. 相关知识点: 试题来源: 解析 C。混杂变量是可能影响实验结果的额外变量。在音乐对情绪影响的实验中,实验进行的时间可能会影响参与者的情绪,从而成为混杂变量。选项 A 音乐音量可以作为独立变量控制。选项 B 音乐类型也可以...