Out of the following, which instrument emits a monotone ?

1. guitar
2. flute
3. piano
4. tuning fork

The pitch of a note depends on :

1. frequency
2. amplitude
3. waveform
4. loudness

The quality of a musical sound depends on :

1. number of subsidiary notes
2. relative amplitudes
3. both (1) and (2)
4. none of the above

Two identical guitars are tuned to the same frequency. One is played close to the sound hole and the other close to the bridge (near the end of the strings). Both are played with the same force. The reason for difference in the two sounds is :

1. Pitch changes as plucking point affects frequency.
2. Loudness changes.
3. There is no difference at all.
4. Timbre changes due to harmonics.