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15、DIV.MyFav_1324346536813 DIV.Section1page: Section1DIV.MyFav_1324346536813 OLMARGIN-BOTTOM: 0cmDIV.MyFav_1324346536813 ULMARGIN-BOTTOM: 0cm一、选择题（本题共15小题，每小题3分，共45分。每小题只有1个选项符合题意，把正确选项前面的字母填在题干后的括号内，选对的得3分，多选、错选均不得分）题号123456789101112131415答案DBCADDCDADDBBAD二、填空题（本题20空，每空1分，共20分）16压力一定的情况下，减小接触面积增大压强。17
16、 4 8106110518 3000 小于19壶嘴和壶内的水位不等高 连通器原理20将被压入瓶中 大气压强存在21低 大气压22不变 变浅23 2 下沉24小 大25 低 不变三、作图题（每小题4分，共8分）2627四、实验探究与设计题（第28小题6分，第29小题8分，共14分）28 D B C29（1）浮力的大小与排开水的多少有关 （2）浮力和排开水的重力（3）B和C （4）C五、计算题（第（1）小题3分，第（2）小题4分，第（3）小题6分，共13分）30（1）m=0.16kg=160g ；（2）F浮=G-F=1.6N-1.4N=0.2N ；（3）F浮=水gV排V排=210-5m3=20cm3V=V排=20cm3=8g/cm3=8103kg/m38103kg/m3<8.9103kg/m3故：这批水龙头不是纯铜的。