List of top Building Services and Sustainability Questions on Thermal, visual and acoustic comfort in built environments asked in GATE AR

The decay of sound in an enclosed lecture hall of volume 3500 $m^3$ is shown in the Figure below. The sound source is switched off at point P. Using the Reverberation Time $(RT_{60})$ obtained from the figure, the calculated total sound absorption of the hall, in Sabins, is _____ (rounded off to the nearest integer).

Which of the following statements is/are true?

Match the instruments in Group I with the physical quantities they measure in Group II. \[ \begin{array}{|c|c|} \hline Group I & Group II
\hline (P) \ \text{Goniophotometer} & (1) \ \text{Electromagnetic Energy at Specific Wavelengths of Light}
(Q) \ \text{Pyrheliometer} & (2) \ \text{Luminous Flux of Directed Light Sources}
(R) \ \text{Spectrophotometer} & (3) \ \text{Direct Solar Irradiance}
(S) \ \text{Forward-Looking Infrared Camera} & (4) \ \text{Temperature}
& (5) \ \text{Global Solar Radiation}
\hline \end{array} \]

Match the terms in Group I with their associated items in Group II. \[ \begin{array}{|c|c|} \hline Group I & Group II
\hline (P) \ \text{Scotopic vision} & (1) \ \text{Ability to see under low light condition using rod cells}
(Q) \ \text{Presbyopia} & (2) \ \text{Vision in bright light using cone cells}
(R) \ \text{Emmetropia} & (3) \ \text{Inability to focus on distant objects}
(S) \ \text{Photopic vision} & (4) \ \text{Ideal distance vision}
& (5) \ \text{Inability to focus on nearby objects}
\hline \end{array} \]

Thermal diffusivity of a wall is influenced by the choice of building material. Identify the statement(s) that is/are correct.

As per IS:4954 – 1964, the acceptable noise level (in dB) for urban residential areas is \underline{\hspace{2cm}}.