五年级英语科学实验单选题50题(含答案)

五年级英语科学实验单选题50题(含答案)
1.We use a ______ to look at very small things.
A.microscope
B.thermometer
C.telescope
D.beaker
答案：A。

“microscope”是显微镜，用来观察非常小的东西；“thermometer”是温度计；“telescope”是望远镜；“beaker”是烧杯。

本题题干说看非常小的东西，所以是显微镜。

2.In a science experiment, we pour liquid into a ______.
A.flask
pass
C.ruler
D.pencil case
答案：A。

“flask”是烧瓶，可以用来倒液体；“compass”是指南针；“ruler”是尺子；“pencil case”是铅笔盒。

题干说在科学实验中倒液体，所以是烧瓶。

3.We measure temperature with a ______.
A.scale
B.graduated cylinder
C.thermometer
D.magnifying glass
答案：C。

“thermometer”是温度计，用来测量温度；“scale”是秤；“graduated cylinder”是量筒；“magnifying glass”是放大镜。

4.A ______ is used to hold chemicals.
A.test tube
B.pen
C.book
D.eraser
答案：A。

“test tube”是试管，用来装化学药品；“pen”是钢笔；“book”是书；“eraser”是橡皮。

5.We measure the volume of a liquid with a ______.
A.stopwatch
B.thermometer
C.graduated cylinder
D.scissors
答案：C。

“graduated cylinder”是量筒，用来测量液体体积；“stopwatch”是秒表；“thermometer”是温度计；“scissors”是剪刀。

6.A ______ is used to magnify objects.
A.magnifying glass
B.pencil
C.stapler
D.calculator
答案：A。

“magnifying glass”是放大镜，用来放大物体；“pencil”
是铅笔；“stapler”是订书机；“calculator”是计算器。

7.We use a ______ to measure length.
A.ruler
B.magnet
C.light bulb
D.battery
答案：A。

“ruler”是尺子，用来测量长度；“magnet”是磁铁；“light bulb”是灯泡；“battery”是电池。

8.A ______ is used to mix chemicals.
A.spatula
B.pencil sharpener
C.stapler
D.paper clip
答案：A。

“spatula”是搅拌棒，用来混合化学药品；“pencil sharpener”是削笔刀；“stapler”是订书机；“paper clip”是回形针。

9.We observe stars with a ______.
A.telescope
B.pencil
C.eraser
D.scissors
答案：A。

“telescope”是望远镜，用来观察星星；“pencil”是铅笔；“eraser”是橡皮；“scissors”是剪刀。

10.A ______ is used to hold a test tube.
A.test tube holder
B.pen
C.book
D.eraser
答案：A。

“test tube holder”是试管夹，用来夹试管；“pen”是钢笔；“book”是书；“eraser”是橡皮。

11.We pour water into a beaker first. Then we add some salt. What should we do next?
A.Add more water.
B.Stir the mixture.
C.Pour out the water.
D.Take out the salt.
答案：B。

本题考查科学实验步骤的英语表达。

首先倒入水，接着加盐，下一步应该是搅拌混合物。

A 选项是加更多的水，不符合实验顺序；C 选项是倒出水，也不对；D 选项拿出盐也不是正确步骤。

12.In an experiment about plants, we water the plants every day. After that, we observe their growth. What do we do before watering the plants?
A.Put the plants in the sun.
B.Take the plants out of the pot.
C.Measure the height of the plants.
D.Choose the plants.
答案：D。

本题考查植物实验的步骤。

每天给植物浇水，在浇水之前应该先选择植物。

A 选项把植物放在太阳下是浇水后的动作；B 选项把植物从花盆里拿出来不是常规步骤；C 选项测量植物高度也不是浇水前的动作。

13.We are doing an experiment with magnets. First, we put two magnets close to each other. Then what?
A.Move one magnet away.
B.See if they attract or repel.
C.Turn one magnet around.
D.Put a piece of paper between them.
答案：B。

本题考查磁铁实验步骤。

先把两个磁铁靠近，接着应该看看它们是吸引还是排斥。

A 选项移开一个磁铁不是紧接着的步骤；C 选项把一个磁铁转过来也不是下一步；D 选项在它们之间放一张纸也不对。

14.For an experiment on light, we turn on a flashlight. What should we do next?
A.Shine the flashlight on a wall.
B.Close the flashlight.
C.Take apart the flashlight.
D.Change the batteries of the flashlight.
答案：A。

本题考查光的实验步骤。

打开手电筒后，应该把光照射在墙上。

B 选项关上手电筒不对；C 选项拆开手电筒不是下一步；
D 选项更换电池也不是紧接着的动作。

15.We are doing an experiment on sound. First, we strike a tuning fork. Then what?
A.Listen to the sound.
B.Put the tuning fork in water.
C.Break the tuning fork.
D.Touch the tuning fork.
答案：A。

本题考查声音实验步骤。

敲击音叉后，应该听声音。

B 选项把音叉放入水中不对；
C 选项打碎音叉不是正确步骤；
D 选项触摸音叉也不是下一步动作。

16.In an experiment on heat, we put a cup of water on a hot plate. What should we do next?
A.Turn off the hot plate.
B.Measure the temperature of the water.
C.Pour out the water.
D.Add more water to the cup.
答案：B。

本题考查热的实验步骤。

把一杯水放在加热板上后，应该测量水的温度。

A 选项关掉加热板不是下一步；C 选项倒出水不对；D 选项往杯子里加更多的水也不是紧接着的动作。

17.We are doing an experiment on air pressure. First, we cover a jar with a balloon. Then what?
A.Pop the balloon.
B.Put the jar in water.
C.Squeeze the jar.
D.Observe if the balloon changes.
答案：D。

本题考查气压实验步骤。

用气球盖住罐子后，应该观察气球是否有变化。

A 选项弄破气球不对；B 选项把罐子放入水中不是下一步；C 选项挤压罐子也不是正确的下一步。

18.For an experiment on solubility, we put some salt in a glass of water. What should we do next?
A.Add more salt.
B.Stir the water.
C.Pour out the water.
D.Take out the salt.
答案：B。

本题考查溶解度实验步骤。

把盐放入一杯水中后，应该搅拌水。

A 选项加更多的盐不是下一步；C 选项倒出水不对；D 选项拿出盐也不是正确步骤。

19.We are doing an experiment on electricity. First, we connect a battery to a bulb. Then what?
A.Turn on the switch.
B.Remove the battery.
C.Break the bulb.
D.Put a piece of paper between the battery and the bulb.
答案：A。

本题考查电的实验步骤。

把电池和灯泡连接后，应该
打开开关。

B 选项移除电池不对；C 选项打破灯泡不是正确步骤；D
21.We saw the liquid ______ when we heated it.
A.boil
B.boils
C.boiled
D.to boil
答案：A。

本题考查“see sb/sth do sth”的用法，表示看到某人或某物做某事的全过程。

“boil”在这里用原形。

22.The solid turned into a liquid and then ______ into gas.
A.change
B.changes
C.changed
D.changing
答案：C。

本题考查动词时态，前面“turned”是过去式，后面“change”也用过去式“changed”保持一致。

23.The experiment showed that water ______ at 100 degrees Celsius.
A.boils
B.boiled
C.is boiling
D.was boiling
答案：A。

一般情况下，“water boils at 100 degrees Celsius”是客观事实，用一般现在时。

24.The chemical reaction made the liquid ______ a different color.
A.turn
B.turns
C.turned
D.to turn
答案：A。

“make sb/sth do sth”，“turn”用原形。

25.When we mixed two substances, we observed that they ______ a new substance.
A.form
B.forms
C.formed
D.forming
答案：C。

本题考查动词时态，“observed”是过去式，“form”也用过去式“formed”。

26.The gas ______ up when we opened the container.
A.rise
B.rises
C.rose
D.rising
答案：C。

“opened”是过去式，“rise”也用过去式“rose”。

27.The experiment results ______ that our hypothesis was correct.
A.show
B.shows
C.showed
D.showing
答案：C。

本题考查动词时态，根据语境用过去式“showed”。

28.The magnet ______ the iron filings.
A.attract
B.attracts
C.attracted
D.attracting
答案：C。

根据语境判断是过去发生的动作，用过去式“attracted”。

29.The candle ______ when there was no more oxygen.
A.put out
B.puts out
C.was put out
D.putting out
答案：C。

“candle”和“put out”之间是被动关系，且根据语境用一般过去时的被动语态“was put out”。

30.The ice ______ when we left it in the sun.
A.melt
B.melts
C.melted
D.melting
答案：C。

“left”是过去式，“melt”也用过去式“melted”。

31.We did an experiment. The result shows that plants need water to grow. Which one is true?
A.Plants don't need water.
B.Plants need air to grow.
C.Plants need water to grow.
D.Plants need sunlight only.
答案：C。

A 选项错误，实验结果表明植物需要水才能生长；B 选项虽然植物也需要空气生长，但本题强调的是水；C 选项正确，符合实验结果；D 选项错误，植物不只需要阳光。

32.The experiment on magnets shows that like poles _____.
A.attract
B.repel
C.don't interact
D.are stronger
答案：B。

A 选项是异极相吸，本题问的是同极；B 选项正确，同极相斥；C 选项错误，同极是有相互作用的；D 选项错误，同极没有更强这一说法。

33.In an experiment about solubility, we found that salt dissolves in water. Which is wrong?
A.Sugar dissolves in water.
B.Oil dissolves in water.
C.Salt can dissolve in water.
D.Water is a solvent.
答案：B。

A 选项正确，糖能溶解于水；C 选项正确，符合实验结果；D 选项正确，水是一种溶剂；B 选项错误，油不溶解于水。

34.The result of an experiment on sound shows that sound travels through _____.
A.vacuum
B.air
C.water
D.solid
答案：B。

A 选项错误，声音不能在真空中传播；B 选项正确，声音可以通过空气传播；C 选项声音也可以通过水传播，但不如空气常见；D 选项声音也可以通过固体传播，但本题最佳答案是空气。

35.In an experiment on heat transfer, we know that heat can transfer by _____.
A.radiation only
B.conduction only
C.convection only
D.all of the above
答案：D。

A 选项辐射是一种热传递方式；B 选项传导也是；C 选项对流同样是；D 选项正确，热可以通过以上三种方式传递。

36.The experiment on electricity shows that a closed circuit is needed
for electricity to flow. Which is not true?
A.An open circuit can't let electricity flow.
B.A battery provides electricity.
C.A wire is not necessary in a circuit.
D.A bulb lights up in a closed circuit.
答案：C。

A 选项正确，开路不能让电流通过；B 选项正确，电池提供电；D 选项正确，在闭合电路中灯泡会亮；C 选项错误，电路中电线是必要的。

37.In an experiment on forces, we found that a bigger force can move
a heavier object. Which is false?
A.A small force can move a light object.
B.A heavy object needs a big force to move.
C.No force is needed to move an object.
D.Forces can change the motion of an object.
答案：C。

A 选项正确，小力可以移动轻物体；B 选项正确，重物体需要大力才能移动；D 选项正确，力可以改变物体的运动状态；
C 选项错误，物体的运动状态改变需要力。

38.The result of an experiment on light shows that light travels in _____.
A.straight lines
B.curves
C.circles
D.random directions
答案：A。

光在同种均匀介质中沿直线传播，B 选项曲线错误；
C 选项圆圈错误；
D 选项随机方向错误。

39.In an experiment on plants, we saw that leaves are important for _____.
A.making food
B.absorbing water
C.storing nutrients
D.growing flowers
答案：A。

叶子通过光合作用制造食物，B 选项吸收水分主要是根的作用；C 选项储存营养主要是果实等部位；D 选项长花不是叶子的主要作用。

40.The experiment on gravity shows that objects with more mass have _____.
A.less gravity
B.more gravity
C.no gravity
D.the same gravity as lighter objects
答案：B。

物体质量越大，重力越大，A 选项错误；C 选项错误，有质量的物体都有重力；D 选项错误，质量不同重力不同。

41.We should always wear _____ when doing science experiments.
A.gloves
C.socks
D.shoes
答案：A。

本题考查科学实验安全注意事项的英语表达。

做科学实验时应该戴手套，选项A“gloves”符合题意。

帽子、袜子和鞋子不是做实验时必须要戴的。

42.Don't touch _____ chemicals without permission.
A.dangerous
B.beautiful
C.colorful
D.small
答案：A。

题干强调科学实验中的安全问题，不能未经允许触摸危险的化学品，选项A“dangerous”符合题意。

其他选项与安全问题不直接相关。

43.Before starting an experiment, we should read the _____ carefully.
A.book
B.newspaper
C.instructions
D.story
答案：C。

做实验前应该仔细阅读说明，选项C“instructions”符合题意。

书、报纸和故事与实验安全注意事项关系不大。

44.If there is a fire during the experiment, we should use a _____.
B.fire extinguisher
C.paper
D.pen
答案：B。

实验中如果发生火灾，应该使用灭火器，选项B“fire extinguisher”符合题意。

用水可能会使某些情况更糟，纸和笔不能灭火。

45.When an experiment is in progress, we should not _____.
A.talk loudly
B.run around
C.sit quietly
D.listen carefully
答案：B。

实验进行中不应该到处跑，选项B“run around”符合题意。

大声说话、安静坐着和认真听与安全问题关系不大。

46.We must keep the laboratory _____ and tidy.
A.clean
B.dirty
C.crowded
D.noisy
答案：A。

实验室必须保持干净整洁，选项A“clean”符合题意。

脏、拥挤和吵闹都不利于实验安全。

47.Don't eat or drink in the laboratory because _____.
A.it's not polite
B.it's not allowed
C.it's not healthy
D.it's not delicious
答案：B。

不能在实验室吃喝是因为不被允许，选项B“it's not allowed”符合题意。

与礼貌、健康和美味无关。

48.If you spill a chemical, you should _____.
A.leave it
B.hide it
C.clean it up
D.ignore it
答案：C。

如果洒了化学品，应该清理干净，选项C“clean it up”符合题意。

留下、藏起来和忽略都不安全。

49.Always follow the _____ when doing experiments.
A.teacher
B.friends
C.rules
D.books
答案：C。

做实验时应该始终遵守规则，选项C“rules”符合题意。

跟随老师、朋友和书不是主要的安全注意事项。

50.When you finish an experiment, you should _____.
A.go home quickly
B.play in the laboratory
C.put away the equipment
D.leave everything as it is
答案：C。

实验结束后应该把设备收起来，选项C“put away the equipment”符合题意。

快速回家、在实验室玩和保持原状都不合适。