SELECT * FROM question_mgmt as q WHERE id=6539 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 fill in the blanks with suitable words a time

Question:

Fill in the blanks with suitable words.
(a) Time taken by an object to complete one oscillation is called ................... .
(b) Loudness is determined by the .........................of vibration.
(c) The unit of frequency is..........................
(d) Unwanted sound is called ......................... .
(e) Shrillness of a sound is determined by the ................. of vibration.

Answer:

(a) Time period

Time period may be defined as the time taken by an object or a body to complete the one oscillation or a cycle.

(b) Amplitude

Amplitude shows the loudness of the sound. When the amplitude of the vibration is larger, then the sound produced will be very loud. When the amplitude is small then the produced sound will be feeble.

(c) Hz

Hertz is the unit of frequency. Frequency may be defined as the number of oscillation in one second.

(d) Noise

The sound which is unpleasant and unwanted to ears known as noise whereas the sound which us pleasant to the ears is known as music.

(e) Pitch

If the frequency of the vibration is higher, then the produced sound will be shrill and it has high pitch whereas if the frequency of vibration is lower, then the sound will contain lower pitch.


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