SOUND (VIII)

Which of the following statement is true?

1. Sound is a form of energy

2. Sound propagates via vacuum

3. Sound is caused by vibrations

• Only 1

• Only 3

• 1 and 3

• 1, 2 and 3

The magnitude of maximum disturbance on either side of the mean value is termed as

• Frequency

• Wavelength

• Amplitude

• None of the above

Voice box is also known as

• Pharynx

• Larynx

• Stapes

• Pheonix

Which of the following is incorrect?

• Amplitude (green) > Amplitude (pink)

• Amplitude (pink) > Amplitude (green)

• Amplitude (pink) < Amplitude (black)

• Amplitude (black) = Amplitude (green)

Which of the following is the correct order of increasing frequency?

• Red < Yellow < Green < Blue

• Red > Yellow > Green > Blue

• Red > Blue > Green > Yellow

• Red > Green > Yellow > Blue

An electric generator produces a sound of 7.0 KHz, while a rocket launch produces a sound of 10KHz. Check whether the sound is audible to human ?

• Sound of electric generator is audible but sound of rocket launch is inaudible

• Sound of electric generator is inaudible but sound of rocket launch is audible

• Both the sounds are audible

• Both the sounds are inaudible

Loudness depends upon ________ while pitch depends upon _________

• Frequency, Amplitude

• Amplitude, Frequency

• Amplitude, Wavelength

• Wavelength, Frequency

A simple pendulum oscillates 72 times in 2 minutes. Calculate the frequency.

• 144 Hz

• 72 Hz

• 1.2 Hz

• 0.6 Hz

Which of the following is incorrect?

As frequency increases, _______________

• Time period decreases

• Pitch increases

• Wavelength decreases

• Amplitude increases

A butterfly flaps her wings 1369 times in 148 seconds. Which of the following is true for given data ?

1. Frequency = 9.25 Hz

2. Time period = 0.108 s

• Only 1

• Only 2

• Both 1 and 2

• Neither 1 nor 2