Which one of the following is the permissible level of noise in a silent zone at daytime ?

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Q: 109 (CDS-I/2009)
Which one of the following is the permissible level of noise in a silent zone at daytime ?
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question_subject: 

Science

question_exam: 

CDS-I

stats: 

0,7,10,7,5,4,1

keywords: 

{'silent zone': [0, 0, 1, 0], 'noise': [0, 1, 3, 1], 'permissible level': [0, 0, 1, 0], 'daytime': [0, 0, 0, 1]}