1.3《噪声及其控制》同步练习4

三、噪声及其控制

一．填空：

1．从物理学的角度看，乐音和噪声的主要区别是：乐音的振动是，而噪声的振动却是．从环境保护角度来说，一切干扰的声音都叫噪声．

2．在声学上人们用为单位来表示声音的强弱，通常把人耳能听到的最小的声音大小定义为．

3．“无声手枪”是在处减弱噪声的；放鞭炮时，用手捂住耳孔，这是在处减弱噪声的；教室外噪声较大，同学们关好门窗后继续认真听课，这是在中减弱噪声的．

4．现代城市中常在主要街道上设置噪声监测设备，若某一时刻该装置的显示屏上显示50.68的数据．这个数据的单位是；若附近有汽车或者摩托车驶过时，显示屏上的数据将(选填“增大”或“减小”)．

二．选择：

5．下列判断中，正确的是( )

A．人的理想安静环境是0dB

B．噪声刺耳难听，但不会导致人患病

C．音乐虽好听，但如影响人的学习和休息，也属于噪声

D．在马路和住宅之间植树只是为了美观

6．在柴油机排气管上加消声器的目的，是为了使噪声( )

A．在传播中减弱B．在声源处减弱

C．在接收处采取防护措施减弱D．三者都有

7．洗衣机在工作时，因洗衣机没有放稳而引起噪声，正确的处理方法是( ) A．在声源处减弱，放稳洗衣机

B．在洗衣机内加更多水

C．在传播中减弱，关上门窗

D．在人耳处减弱，塞上耳塞

8．在声音大的厂区周围都砌有很高的墙和种植很多高大的树木，这是为了( ) A．在声源处减弱噪声

B．在传播过程中减弱噪声

C．在人耳处减弱噪声

D．以上答案均不对

9．在城市高架道路的某些路段两侧设有3～4m高的透明墙，安装这些板墙是为了( )

A．保护车辆安全行驶

B．阻止车辆排放的废气外泄

C．体现高架道路设计的美观

D．阻挡车辆产生的噪声，减小噪声污染

10．下列声音中，属于噪声的是——(选填序号)( )

(A)城市里汽车发动机的运转声

(B)歌唱时乐器的伴奏声

(C)自习课时的喧哗声

(D)晨读时的朗读声

(E)汽车高音喇叭的尖叫声

(F)夜深人静时的引吭高歌声

(G)装修房间时的电钻声

(H)清晨公园树林中小鸟的欢叫声

11．下列关于噪声和乐音的叙述中，错误的是( )

A．乐音悦耳动听，给人以享受；噪声使人烦躁不安，有害人的健康

B．乐音是乐器发出的声音，噪声是机器发出的声音

C．乐音的振动遵循一定规律，噪声的振动杂乱无章，无规律可循

D．从环境保护角度来说，一切干扰人的休息、学习和工作的声音都叫噪声12．以下减小噪声的措施中，属于在传播过程中减弱的是( )

A．建筑土地上噪声大的工作要限时

B．市区里种草植树

C．戴上防噪声的耳塞

D．市区内汽车喇叭禁鸣

13．为降低噪声危害，下列方法中，可行的是( )

A．减小发声体的振动频率B．减小声音的传播速度

C．减小发声体的振动幅度D．以上三种方法同时采用

14．一场大雪过后，人们会感到外面万籁俱寂，究其原因，你认为正确的是( ) A．可能是大雪后，行驶的车辆减少，噪声减小

B．可能是大雪蓬松且多孔，对噪声有吸收作用

C．可能是大雪后，大地银装素裹，噪声被反射

D．可能是大雪后气温较低，噪声传播速度变慢

15．下列关于乐音和噪音的叙述中，错误的是( )

A．无论乐音和噪音，都是由物体振动产生的

B．乐器只会发出乐音，不会发出噪声

C．乐音能使人心情舒畅；噪音却使人烦燥不安，有碍健康

D．乐音振动是有规律的，而噪音振动是无规律的

16．一位同学晚上在家看电视，为了不影响其他人的休息，他应采取下列哪些措施( )

A．让家里其他人戴上耳塞B．把音量开关关上，不让电视机发出声音C．插上耳机，自己用耳机听D．用电视罩把电视机罩住

三．计算与论述：

17．假如你是一位城市建设的规划者，你将采取怎样的措施减弱噪声给人们带来的危害?(举出两例即可)

18．噪声是有害的，科学家发现强噪声能使人中枢神经麻痹，造成人暂时昏迷．噪声还会促使一些敏感的植物种子早发芽．同时噪声也是一种能量浪费，噪声可释放大量能量．你能否对噪声的这些危害作些设想，使之变害为利?

参考答案

一：

1．规律，杂乱无章，人们的身心健康

2．分贝，零分贝

3．声源，人耳，传播过程4．分贝，增大

二：

5．C

6．B

7．A

8．B

9．D 10．A．C．E．F．G 11．B

12．B

13．C

14．B

15．B

16．C

三：

17．略

18．略

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