Download App

Sound — Science STD 9 — Question

Rajasthan BoardEnglish MediumSTD 9ScienceSound1 Mark
Question
Sounds having frequency more than 20,000 Hz are called:
✓

Answer

  1. Ultrasonic sound
Explanation:
Sounds having frequency more than 20,000 Hz are called Ultrasonic sound. As this is above the normal hearing range for humans, we cannot hear ultrasonic sound.

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "M.C.Q. [1 M]" from Sound→Sound — all question types→Science STD 9 question papers→Rajasthan Board STD 9 question papers→Rajasthan Board question paper generator→

Similar questions

Omnis cellulae cellualae i.e., new cells arise from pre-existing cells; this statement was given by ______.
→
The common characteristic of suspension and colloidal solution is:
→
Who stated the law of constant proportion:
→
Which of the following is micronutrient?
→
In a sample of ethyl ethanoate $(CH_3COOC_2H_5)$ the two oxygen atoms have the same number of electrons but different number of neutrons. Which of the following is the correct reason for it?
→
Sum of atomic masses of all atoms in a formula unit of an ionic compound is known as :
→
Determine the number of electron in the isotope of 'H' (mass no. 2).
→
Why do we not hear the screams of a bat:
→
Which of the following elements does not exhibit electrovalency?
→
A boy of mass 50kg standing on ground exerts a force of 500N on the ground. The force exerted by the ground on the boy will be:
→