Noise pollution is measured in -

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RRB JE Previous Paper 1 (Held On: 22 May 2019 Shift 2)

Answer 1

Noise pollution is measured in Decibel.

The decibel (dB) is a logarithmic unit used to measure sound level.
It is also widely used in electronics, signals and communication.
In ordinary usage, specification of the intensity of a sound implies a comparison of the intensity of the sound with that of a sound just perceptible to the human ear.
In simple terms, the dB is the ratio between two power levels expressed in logarithmic terms with relation to some reference level.
For example, if given two known power levels, P2 and P1, the relative value of P2 with respect to P1 in dB is given by:
- dB = 10 log ₁₀ (P₂/P₁)
Noise levels below 35–40 dB are usually necessary for a good night’s sleep.
A busy office may be about 60 dB while the noise level on a footpath beside a busy road might be approximately 75 dB.
A departing jumbo jet may result in 120 dB being recorded along the runway.
Ohm is the SI unit of electrical resistance, transmitting a current of one ampere when subjected to a potential difference of one volt.
Joule, unit of work or energy in the International System of Units (SI); it is equal to the work done by a force of one newton acting through one metre.
Ampere is a unit of electric current equal to a flow of one coulomb per second.