SELECT * FROM question_mgmt as q WHERE id=6538 AND status=1 SELECT id,question_no,question,chapter FROM question_mgmt as q WHERE courseId=12 AND subId=16 AND chapterId=376 and ex_no='1' AND status=1 ORDER BY CAST(question_no AS UNSIGNED) CBSE Free NCERT Solution of 8th science Sound in the following statements tick t against those

Question:

In the following statements, tick T against those which are true, and F against those which are false:

(a) Sound cannot travel in vacuum. (T/F)
(b) The number of oscillations per second of a vibrating object is called its time period. (T/F)
(c) If the amplitude of vibration is large, sound is feeble. (T/F)
(d) For human ears, the audible range is 20 Hz to 20,000 Hz. (T/F)
(e) The lower the frequency of vibration, the higher is the pitch. (T/F)
(f) Unwanted or unpleasant sound is termed as music. (T/F)
(g) Noise pollution may cause partial hearing impairment. (T/F)

Answer:

(a) True

This statement is true because sound cannot travel in vacuum. Sound is produced by vibrations. If there, air is not present then sound cannot be produced.

(b) False

This statement is false because the number of oscillations per second of a vibrating object is called its frequency.

(c) False

This statement is false if the amplitude of vibration is large, then the sound will be sharp and having a high pitch.

(d) True

This statement is true because the range of hearing a sound is 20 Hz to 20000 Hz. Above 20,000 Hz the sound is not audible and harmful for ears.

(e) False

This statement is false because as higher is the frequency, the pitch of the sound is high.

(f) False

This statement is false because the unwanted and unpleasant sound is termed as noise pollution whereas the pleasant sound is known as music.

(g) True

This statement is true because noise pollution is harmful to the ears and it may cause partial hearing impairment. The unwanted and unpleasant sound is known as noise pollution.


< Previous Question

Next Question >

SELECT ex_no,question,question_no,id,chapter FROM question_mgmt as q WHERE courseId='12' AND subId='16' AND ex_no!=0 AND status=1 and id!=6538 ORDER BY views desc, last_viewed_on desc limit 0,10

  • Popular questions of class 8 Science

SELECT ex_no,question,question_no,id,chapter FROM question_mgmt as q WHERE courseId='12' AND subId='16' AND ex_no!=0 AND status=1 and id!=6538 ORDER BY last_viewed_on desc limit 0,10

  • Recently Viewed Questions of Class 8 Science

Comments

  • Answered by Ekta Mehta
  • 4 months ago

Taking Screenshots on your Samsung Galaxy M31s is very easy and quick.

  • Answered by Ekta Mehta
  • 4 months ago

Taking Screenshots on your Samsung Galaxy M31s is very easy and quick.

  • Answered by Ekta Mehta
  • 4 months ago

Taking Screenshots on your Samsung Galaxy M31s is very easy and quick.

Comment(s) on this Question


NCERT Solutions

Quick Links

Resources

Support