Multiple-choice questions on environmental noise [Daily Question 090225]
Thread Content
1. A commercial karaoke bar is separated from a residence in the residential area by only a wall (0.9 meters). What is the allowable noise emission level for this karaoke bar at night? ( ) dB(A) A. 30 B. 35 C. 40 D. 45 2. To measure noise levels in the social living environment that are 35 dB or lower, a ( ) type sound level meter should be used, and its measurement range must be suitable for the noise being measured. Type A0, Type B1, Type C2, Type D3. 3. The measuring instruments used to measure noise in the social living environment must be acoustically calibrated at the measurement site before and after each measurement; the deviation between the readings obtained from these calibrations must not exceed ( ) dB, otherwise the measurement results are invalid. A0.3 B0.4 C0.5 D0.6 4. When the difference between the noise measurement value and the background noise value is 10dB(A), is it necessary to adjust the noise measurement value? () A is B? No. Last edited by lyhh9024 on 2009-2-24 22:04]
1. A commercial karaoke bar is separated from a residence in the residential area by only a wall (0.9 meters). What is the allowable noise emission level for this karaoke bar at night? (C40) dB(A): A30, B35, C40, D45. 2. To measure noise levels in social living environments that are 35 dB or lower, a (B1 type) sound level meter should be used, and its measurement range must be suitable for the noise being measured. Type A0, Type B1, Type C2, Type D3. 3. The measuring instruments used to measure noise in the social living environment must be acoustically calibrated at the measurement site before and after each measurement; the deviation between the readings obtained from these calibrations must not exceed (C0.5) dB, otherwise the measurement results are invalid. A0.3 B0.4 C0.5 D0.6 4. When the difference between the noise measurement value and the background noise value is 10 dB(A), is it necessary to adjust the noise measurement value? (B No). A is B no
1.C 2.B 3.C 4.B
1.A 2.B 3.C 4.B
1.A 2.B 3.C 4.B
1. A commercial karaoke bar is separated from a residence in the residential area by only a wall (0.9 meters). What is the allowable noise emission level for this karaoke bar at night? (B) dB(A): A30, B35, C40, D45. 2. To measure noise levels in social living environments that are 35 dB or lower, a sound level meter of type (B) should be used, and its measurement range must be suitable for the noise being measured. Type A0, Type B1, Type C2, Type D3. 3. The measuring instruments used to measure noise in the social living environment must be acoustically calibrated at the measurement site before and after each measurement; the deviation between the readings obtained from these calibrations must not exceed (C) dB, otherwise the measurement results are invalid. A0.3 B0.4 C0.5 D0.6 4. When the difference between the noise measurement value and the background noise value is 10 dB(A), is it necessary to adjust the noise measurement value? (A) A is B? No. This post was last edited by wuqitao0000 on 2009-2-25 15:09.]
1 A 2 B 3 C 4 B
1.A 2.B 3.C 4.B
My answers: D, B, C, B. This post was last edited by muzi840615 on 2009-2-25 08:03.]
1.A 2.B 3.C 4.B
1 B 2 B 3C 4B
My answer: C, B, C, B
1.C 2.B 3.C 4.B
1.C 2.B 3.C 4.B
1. A commercial karaoke bar is separated from a residence in the residential area by only a wall (0.9 meters). What is the allowable noise emission level for this karaoke bar at night? (B) dB(A): A30, B35, C40, D45. 2. To measure noise levels in social living environments that are 35 dB or lower, a sound level meter of type (B) should be used, and its measurement range must be suitable for the noise being measured. Type A0, Type B1, Type C2, Type D3. 3. The measuring instruments used to measure noise in the social living environment must be acoustically calibrated at the measurement site before and after each measurement; the deviation between the readings obtained from these calibrations must not exceed (C) dB, otherwise the measurement results are invalid. A0.3 B0.4 C0.5 D0.6 4. When the difference between the noise measurement value and the background noise value is 10 dB(A), is it necessary to adjust the noise measurement value? (B) A is B no
I choose: 1.C； 2.B ； 3.C ； 4.B
1、B 2、B 3、C 4、A Last edited by guozq5401461 on 2009-2-25 10:41 ]
1. A commercial karaoke bar is separated from a residence in the residential area by only a wall (0.9 meters). What is the allowable noise emission level for this karaoke bar at night? (C) dB(A): A. 30 B. 35 C. 40 D. 45 2. To measure noise levels in social living environments that are 35 dB or lower, a sound level meter of type (B) should be used, and its measurement range must be suitable for the noise being measured. Type A0, Type B1, Type C2, Type D3. 3. The measuring instruments used to measure noise in the social living environment must be acoustically calibrated at the measurement site before and after each measurement; the deviation between the readings obtained from these calibrations must not exceed (C) dB, otherwise the measurement results are invalid. A0.3 B0.4 C0.5 D0.6 4. When the difference between the noise measurement value and the background noise value is 10 dB(A), is it necessary to adjust the noise measurement value? (B) A is B no
1.C 2.B 3.C 4.B