MCQ PRACTICE – 2

The time period of the second hand in a clock is :

Which of the following is/are correct statement(s)?

A person is in front of a vertical mountain fires a bullet and hears its echo after a time 3 s. The person walks a distance 'd' towards mountain then fires another bullet and hears its echo after a time 2 s. If velocity of sound in air is 340 ms-1 , the value of 'd' is

The minimum distance between the source of the sound and the obstacle for an echo (at 20ºC) to take place is :

An underwater sonar source operating at a frequency of 

The time period of a vibrating body is 0.02s. The frequency of the vibrating body will be

Identify the longitudinal waves from the following

A man pronounces a, b, c, d and e and hears last four syllables as an echo. Taking velocity of sound as 340 ms-1 , the distance of reflecting surface, if it takes one-fifth of a second to pronounce or hear one syllable is

Which one of the following material will reflect sound better?

When a tuning fork is striked using a rubber prong, the compressions and rarefactions in the sound wave correspond to

Three different vibrating bodies produce three types of sounds X, Y, and Z.

The loudness of sound decreases with an:

An echo is heard because of the persistence of _____________

A person standing between a pair of tall and wide cliffs claps his hands. He hears the first two echoes at 2 sec and 3 sec respectively. If the speed of sound is 330 m/sec, then

When a tuning fork produces sound waves in air, which one of the following is the same in the material of tuning fork as well as in air ?