教科版小学三年级科学上册第一单元检测试题(含答案)

教科版小学三年级科学上册第一单元检测

试题(含答案)

Unit 1 Assessment Test

Time: 40 minutes)

1.Fill-in-the-blank ns (1 point per blank。total 16 points)

1) The three forms of water in nature are

2) Wet clothes can be dried because the water in them evaporates and es

3) The process of water turning into water vapor is called

4) Usually。when water is heated to 100°C。it will

at this time。a large amount of

and

will be produced in the water and fly into the air.

5) The amount of salt that can dissolve in a cup of water is

6) XXX in hot water than in cold water.

7) Baking XXX.

8) The temperature of the outer flame in an alcohol lamp is the highest.

9) By using substances。XXX.

10) When a piece of paper is folded into a paper airplane。the

Answer: same or different) characteristics of the paper have changed.

2.True or false ns (2 points per n。total 20 points)

1) Water XXX(True)

2) Water vapor is white。(False)

3) XXX is the result of XXX(False)

4) XXX。the flame should be covered with a lamp cap。(True)

5) If water continues to be heated after boiling。the temperature will continue to rise。(False)

6) If the ice does not melt in an ice-water mixture。the temperature of the water is 0°C。(True)

7) Ice must be converted into liquid water before it can e water vapor。(True)

8) When melting snow。XXX(False)

9) XXX。XXX has no effect。(False)

10) The process of XXX(True)

3.Multiple-choice ns (2 points per n。total 20 points)

1) Which of the following is not related to the speed of n?

A) Temperature of the water

B) Amount of water

C) Speed of airflow above the water surface

Answer: B)

2) Which of the following methods will melt ice cubes the fastest?

A) Let it sit

B) Blow on it with a straw

C) XXX it

Answer: C)

3) Which of the following XXX winter?

A) It is formed by the freezing of water on the branches.

B) It is XXX.

C) It is formed by water vapor in the air XXX.

Answer: A)

4) Which of the following is the correct way to measure the temperature of water with a thermometer?

Answer: A)

5) Which of the following ns of the XXX correct?

A) "White vapor" is water vapor.

B) The colorless part een "white vapor" and the spout is water vapor.

C) Both of the above are water vapor.

Answer: C)

6) At what temperature can all the ice turn into liquid water?

A) -10°C

B) 0°C

Answer: B)

固定烧杯，温度控制在10℃以下，加快溶解时玻璃棒的

作用是引流。关于酒精灯的操作，正确的是用灯帽盖灭火焰，滤纸的边缘要略高于漏斗的边缘，液面要略低于滤纸边缘。下列变化中，蜡烛被切碎和搅拌加快溶解是相似的，而蜡烛熔化和燃烧则不同。

填图题：(1) 0℃和35℃；(2) 搅拌、过滤、蒸发；(3) 受热。

简答题：(1) 加快溶解的方法包括搅拌、加热和研碎；(2)

可以用过滤的方法将食盐和沙子分离，具体实验方案为将混合物加入水中，搅拌后过滤出固体，再将过滤液热蒸发，即可得到食盐。