Note and Tone

Q.

Two musical notes of the same pitch and same loudness are played on two different instruments. Their wave patterns are shown in the figure.

Explain why are the wave patterns different.

Q. A sound of a single frequency is called a tone.

1. True
2. False

Q.

State one difference between a musical note and a noise.

Q.

How can one identify a person in a dark room?

Q.

Note is a sound

1. of mixture of several frequencies

2. of mixture of two frequencies only

3. of a single frequency

4. always unpleasant to listen

Q.

Choose the correct option:

$$\begin{array}{cccc}1.& \text{Tone}& \text{i.}& \text{frequencies that are integral multiple of fundamental frequency.}\\ 2.& \text{Note}& \text{ii.}& \text{sound of single frequency.}\\ 3.& \text{Overtone}& \text{iii.}& \text{sound of multiple frequencies.}\\ 4.& \text{Harmonic}& \text{iv.}& \text{higher frequencies other than fundamental frequency.}\end{array}$$

1. 1 - ii, 2 - iv, 3 - iii, 4 - i

2. 1 - ii, 2 - iii, 3 - iv, 4 - i.

3. 1 - iii, 2 - ii, 3 - iv, 4 - i

4. 1 - ii, 2 - iii, 3 - i, 4 - iv

Q.

Assertion: Noise is irritating for the ears.

Reason: Musical sounds consist of a regular succession of pulses in which there is no sudden change in the amplitude.

1. Both Assertion (A) and Reason (R) are correct and the reason is the correct explanation of the assertion.

2. Both Assertion (A) and Reason (R) are correct but the reason is not the correct explanation of the assertion.

3. Assertion (A) is correct, but the reason (R) is false.

4. Assertion (A) is false, but the reason (R) is correct.

Q. What does the term allelic frequency actually means

Q. an open and closed organ pipe have same length. the ratio of Pth mode of frequency of air in two pipes is?

Q. (i) How is it possible to detect the filling of a bottle under a water tap by hearing the sound at a distance?

(ii) Name the characteristic which enables one to distinguish the sound of two musical instruments even if they are of the same pitch and same loudness.

(iii) Which characteristic of sound makes it possible to recognise a person by his voice without seeing him?

Q. Why we write a unit instead of an unit ?