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55 questions
31
Sound
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Assertion (A): A jet aircraft moving at mach number equal to 1 travels faster at an altitude of 15 km than while moving at mach number equal to 1 near the sea level. Reason (R): The velocity of sound depends on the temperature of the surrounding medium.
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Decibel is used to measure :
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Decibel unit is used to measure :
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Decibel unit is used to measure the :
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What is the decibel level of sound produced by two persons in conversation?
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A noise level of 100 decibel would correspond to :
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Which of the following represents the decibel level of rustling of tree leaves in normal circumstance?
38
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As per the WHO, the safe noise level for a city is –
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In the context of permissible noise levels match List-I with List-II and select the answer from the code given below the lists. List-I (Area) A. Residential area B. Silent zone C. Industrial area D. Commercial area List-II (Permissible Noise Level) 1. 50 dB 2. 55 dB 3. 65 dB 4. 70 dB
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Sound
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The tolerable limit of noise for human being is around: