问题 实验题

小明用天平、量筒和水等器材测干燥软木塞(具有吸水性)的密度时,进行了下列操作:

 ①先把天平放在________桌面上,然后将游码移到标尺的“零”刻度线位置上,发现横梁指针向左偏,此时应将平衡螺母向________ 调(选填“左”或“右”)。

② 用调节好的天平测出软木塞的质量m1

③将适量的水倒入量筒中,读出水面对应的示数V1

④用细铁丝将软木塞浸没在装有水的量筒中,过段时间后,读出水面对应的示数V2

⑤将软木塞从量筒中取出,直接用调节好的天平测出其质量m2

(1)将小明操作①的步骤补充完整。

(2)指出小明操作中的不规范之处:___________________________________________。

(3)下表是小明实验中没有填写完整的数据记录表格。请根据图中天平和量筒的读数将表格中的数据填写完整。

(4)对具有吸水性物质的体积测量提出一种改进方法。

_______________________________________________________________

答案

(1)水平;右

(2)将潮湿的软木塞直接放在天平上称量

(3)400;16;150;

(4)把量筒内的水换成细沙或油进行测量(排油法或排沙法)(合理即可)

阅读理解

When Albert Einstein was young, he was a quiet child who spent much of his time alone. He was slow to talk and had difficulty in learning to read.

When Albert was five years old, his father gave him a compass. Albert was filled with wonder when he discovered that the compass needle always pointed in the same direction ---- the north. He asked his father and his uncle what caused the needle to move. Their answers were difficult for Albert to understand. Yet he spent a lot of time thinking about them. He said later that he felt something must be hidden behind things.

Albert didn’t like school. The German schools of that time were not pleasant. Students couldn’t ask questions. Albert said he felt as if he were in prison..

One day Albert told his uncle Jacob how much he hated school, especially mathematics. His uncle told him to solve mathematical problems by pretending to be a policeman. “You are looking for someone,” he said, “but you don’t know who he is. Call him X. Find him by using your mathematical tools.”

Albert learned to love mathematics. He was studying the complex mathematics of calculus while all his friends were still studying simple mathematics. Instead of playing with his friends he thought about things such as “What would happen if people could travel at the speed of his light?”

Albert wanted to teach mathematics and physics. He graduated with honors, but it was a pity that he could not get a teaching job.

小题1:According to Paragraph 2, we can learn that Albert Einstein ________.

A.was interested in the compass

B.wanted to be a great scientist

C.was not clever enough

D.didn’t like thinking by himself小题2:Why did Albert Einstein hate school?

A.He couldn’t play with his friends there

B.Students were not allowed to ask questions.

C.The schools were like prisons at that time

D.He had to learn mathematics that he didn’t like.小题3:What does the underlined word ‘complex’ probably mean?

A.Useful

B.Difficult

C.Boring

D.Interesting小题4:We can learn from the passage that ________.

A.Einstein became a mathematics teacher after graduation

B.Einstein gradually loved mathematics with his uncle’s help.

C.Einstein’s uncle was a policeman.

D.Einstein liked playing with other children.

单项选择题