Arrange the following industrial sources of noise in descending order as per their noise level (in dB):
A. Steel plate riveting
B. High speed drill
C. Circular saw
D. Farm tractor
E. Milling machine
Choose the correct answer from the options given below:निम्नलिखित औद्योगिक शोर स्रोतों को उनके शोर स्तर (dB में) के अनुसार अवरोही क्रम में व्यवस्थित कीजिए:
A. स्टील प्लेट रिवेटिंग
B. हाई-स्पीड ड्रिल
C. परिपत्र आरी (Circular saw)
D. फार्म ट्रैक्टर
E. मिलिंग मशीन
नीचे दिए गए विकल्पों में से सही उत्तर चुनिए:
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Correct answer: B. A, C, D, E, B
Explanation
On typical industrial-noise reference values, steel riveting and circular saws are among the loudest common industrial/workshop noise sources (generally ≥100 dB), while a farm tractor, milling machine and hand drill are comparatively quieter — giving the descending order A, C, D, E, B.सामान्य औद्योगिक-शोर संदर्भ मूल्यों के अनुसार, स्टील रिवेटिंग और परिपत्र आरी सामान्य औद्योगिक/कार्यशाला शोर स्रोतों में सबसे तेज़ (प्रायः ≥100 dB) होती हैं, जबकि फार्म ट्रैक्टर, मिलिंग मशीन और हैंड ड्रिल तुलनात्मक रूप से शांत होते हैं — जिससे अवरोही क्रम A, C, D, E, B बनता है।More People, Development and Environment questions
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