Question

Unpleasant: Noise :: Pleasant sound : _________. Fill in the blank.
A) Audible sound
B) Infrasound
C) Music
D) Ultrasound

Answer 1

Hint: We know that everything we hear is sound and we have differentiated it into many types according to our own needs and its effect on an individual. Now, we know that the sound which is irritating for an individual is termed as noise, and the sounds which are not irritating for an individual are pleasant.

Complete step by step solution:
In the above problem, we are given that unpleasant sound is noise and we have to find that which among the given options fits correctly as a pleasant sound.
Lets take all the options one by one.

Option A: Everything and anything we can hear or listen to is known as audible sound. For example vehicle noise, sound from a musical instrument, any other living being’s noise, etc. Now, we can see that an audible sound can be both pleasant and unpleasant. So, it can’t be the correct option.

Hence, this option (A) is incorrect.

Option B: we know that Infrasound is a sound whose frequency is too low to be heard by human ears. This sound is used by animals to communicate with each other. As it is not audible by human ears, it is impossible to comment that it is unpleasant or pleasant. So, this option is also incorrect.

Hence, this option (B) is also incorrect.

Option C: Now, we know that music is a sound that an individual likes to hear.It is always pleasant to the human ears to hear. So, this is the correct option.

Hence, this option (C) is correct.

Option D: We know that ultrasound is a sound whose frequency is too high to be heard by human ears and it is used in sonography or ultrasound imaging. As it is also not audible by human ears, so it is impossible to comment that it is unpleasant or pleasant. So, this option is also incorrect.

Hence, this option (D) is also incorrect.

Hence, the correct answer is option (C).

Note: We should be always careful in doing these types of questions. As these questions are always a bit confusing. Always try to read the question and then analyze every option carefully to get the best suitable answer to our question.