Levels of Noise – MCQ || Environmental Engineering ||

Levels of Noise – MCQ

1. What is the mathematical expression of sound level in decibels?

a) $L = 10. \log_{10} \frac{Q}{Q_{0}}$
b) $L = \log_{10} \frac{Q}{Q_{0}}$
c) $L = \log_{e} \frac{Q}{Q_{0}}$
d) $L = 10. \log_{e} \frac{Q}{Q_{0}}$

View Answer

a) $L = 10. \log_{10} \frac{Q}{Q_{0}}$ .

2. What is the unit of intensity of sound?

a) Pascal.
b) Decimal.
c) Decibels.
d) Bels/meter.

View Answer

c) Decibels.

3. What is the mathematical expression of sound intensity level in decibels?

a) $L = 10.\log_{e} \left ( \frac{1}{10^{-10}} \right )$
b) $L = \log_{10} \left ( \frac{1}{10^{-10}} \right )$
c) $L = 20.\log_{10} \left ( \frac{1}{10^{-10}} \right )$
d) $L = 10.\log_{10} \left ( \frac{1}{10^{-10}} \right )$

View Answer

d) $L = 10.\log_{10} \left ( \frac{1}{10^{-10}} \right )$ .

4. Which of the following value of reference sound pressure level is considered to measure sound level in decibels?

a) 180μPa
b) 40μPa
c) 20μPa
d) 10μPa

View Answer

c) 20μPa

5. Which of the following expressions represent the sound pressure level in decibels?

a) $L_{p} = 10.\log_{10} \left ( \frac{p_{rms}}{20 \mu Pa} \right )$
b) $L_{p} = 20.\log_{10} \left ( \frac{p_{rms}}{20 \mu Pa} \right )$
c) $L_{p} = 10.\log_{e} \left ( \frac{p_{rms}}{20 \mu Pa} \right )$
d) $L_{p} = 20.\log_{e} \left ( \frac{p_{rms}}{20 \mu Pa} \right )$