What does SONAR stand for?

Important Questions on Sound

EASY

9th CBSE

IMPORTANT

Modern's abc+ Of Science - Physics For Class IX>Chapter 6 - Sound>Formative Assessment>Q 9

What are infrasonic?

EASY

9th CBSE

IMPORTANT

Modern's abc+ Of Science - Physics For Class IX>Chapter 6 - Sound>Formative Assessment>Q 10

What is the minimum distance of obstacle from sources of sound for echo to be heard distinctly?

EASY

9th CBSE

IMPORTANT

Modern's abc+ Of Science - Physics For Class IX>Chapter 6 - Sound>Formative Assessment>Q 1

The number of waves passing through a point of the medium in one second is called wavelength.

EASY

9th CBSE

IMPORTANT

Modern's abc+ Of Science - Physics For Class IX>Chapter 6 - Sound>Formative Assessment>Q 2

The time taken by a wave to travel a distance equal to its wavelength is called the frequency of wave.

EASY

9th CBSE

IMPORTANT

Modern's abc+ Of Science - Physics For Class IX>Chapter 6 - Sound>Formative Assessment>Q 3

$\mathrm{Frequency}\times \mathrm{velocity}=\mathrm{wavelength}$.

EASY

9th CBSE

IMPORTANT

Modern's abc+ Of Science - Physics For Class IX>Chapter 6 - Sound>Formative Assessment>Q 4

A vibrating object produces sound.

EASY

9th CBSE

IMPORTANT

Modern's abc+ Of Science - Physics For Class IX>Chapter 6 - Sound>Formative Assessment>Q 5

Speed greater than the speed of sound in air is called supersonic speed.

MEDIUM

9th CBSE

IMPORTANT

Modern's abc+ Of Science - Physics For Class IX>Chapter 6 - Sound>Formative Assessment>Q 6

The wavelength, $\lambda =\frac{f}{v}$ where $f$ is frequency and $v$ is velocity of wave.