Quality of a musical note depends on

Tone $A$ has a frequency of $240 Hz$. Of the following tones,which one will sound least harmonious with $A$ (in $Hz$)?

In a test,a subsonic jet flies overhead at an altitude of $100 \, m$. The sound intensity level on the ground as the jet passes overhead is $160 \, dB$. At what altitude should the plane fly so that the ground noise is not greater than $120 \, dB$?

The intensity of sound during the festival season increased by $100$ times. This could imply a decibel $(dB)$ level rise from

In an orchestra,the musical sounds of different instruments are distinguished from one another by which of the following characteristics?

Of the following,the one which emits a sound of higher pitch is: