Subject :NSO Class : Class 9
Fill in the given blanks by choosing an appropriate option.
A sound of single frequency is called a _(i)_ . The sound produced due to a mixture of several frequencies is called a _(ii)_ and is pleasant to listen. Sound propagates through a medium at a finite speed but the speed of sound _(iii)_ as it propagates from solid to gaseous medium. In any medium as we _(iv)_ the temperature, the speed of sound also _(v)_.
| (i) | (ii) | (iii) | (iv) | (v) | |
| A | Note | Tone | Increases | Decrease | Decreases |
| B | Note | Tone | Decreases | Increase | Increases |
| C | Tone | Note | Decreases | Increase | Increases |
| D | Tone | Note | Increases | Increase | Increases |