试题与答案

The following data sufficiency problems co

题型:单项选择题

题目:

The following data sufficiency problems consist of a question and two statements, labeled (1) and (2), in which certain data are given. You have to decide whether the data given in the statements are sufficient for answering the question. Using the data given in the statements plus your knowledge of mathematics and everyday facts (such as the number of days in July or the meaning of counterclockwise), you must indicate whether.

If a≠0, is b greater than zero ?()
(1) a+b=10
(2) ab=24

A. Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.

B. Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.

C. BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.

D. EACH statement ALONE is sufficient.

E. Statements (1) and (2) TOGETHER are NOT sufficient.

答案:

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题型:实验题

小明和小华利用如下器材探究物体的浮沉条件:

(1)探究石块下沉的条件

①测量石块的重力

用弹簧测力计测出石块的重力

②测量石块受到的浮力

方法一:小明利用量筒测出石块浸没水中排开水的体积,他可用公式          求得浮力;

方法二:小华采用另一方法也测出了石块受到的浮力,其方法是                   

③通过比较石块的重力和石块受到的浮力,可知物体下沉的条件。

(2) 探究蜡块上浮的条件

①测量蜡块的重力

小明的方案:用弹簧测力计测出蜡块的重力。

小华的方案:用天平测出蜡块的质量,求出重力。

你支持          的方案,理由是                                         

②测量蜡块受到的浮力

小明在量筒中放入适量的水,把蜡块放入水中,待静止时测出蜡块排开水的体积,求得浮力。 你认为上述操作中存在的问题是                                         ,正确的方法是                                                   

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