Physics · Science General

Acoustics and Sound Waves

2,006 Questions

Acoustics and sound waves deal with mechanical vibrations traveling through media like air and water. Key concepts include wave reflection, beats, echoes, the Mach number, and infrasound. These physics fundamentals are regularly tested in general science sections of multiple competitive exams.

Sound wave propagationEchoes and reflectionWave interferenceMach numberInfrasound frequency

Acoustics and Sound Waves Questions

Multiple choice

Which is NOT an example of the use of sound energy?

  1. Beating a drum

  2. Talking

  3. Playing a guitar

  4. Folding clothes
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Sound energy is produced by vibrations. Beating a drum, talking, and playing a guitar all involve vibrations that create sound. Folding clothes is a physical task that does not primarily rely on or produce sound energy.

Multiple choice

What changes a sounds pitch?

  1. how fast or slow a object vibrates

  2. the amount of time an object vibrates

  3. the volume

  4. the material of what is making the sound
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Pitch is determined by the frequency of a sound wave. Higher frequency vibrations result in a higher pitch, while lower frequency vibrations result in a lower pitch.

Multiple choice

What do vibrations in the air produce?

  1. Light

  2. Earthquakes

  3. Space

  4. Sound
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Sound is produced by mechanical vibrations that travel through a medium like air or water. These vibrations create pressure waves that our ears perceive as sound.

Multiple choice

Sound is caused by:

  1. vibrations

  2. Mt. Dew

  3. transversity

  4. wind vane
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Sound is produced by the vibration of objects. These vibrations travel through a medium as waves.

Multiple choice

Which material does sound travel through fastest?

  1. metal

  2. water

  3. air

  4. toothpaste

Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Sound travels fastest through solids because the molecules are packed more closely together, allowing vibrations to transfer more efficiently than in liquids or gases.

Multiple choice physics free, damped and forced oscillations melde's experiment free, forced and damped oscillations sonometer and laws of transverse vibrations

Periodic vibrations of decreasing amplitude are called

  1. Over Vibrations

  2. Critical Vibrations

  3. Damped Vibrations

  4. None of these
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Damped vibrations occur when an oscillating system loses energy over time due to resistive forces like friction or air resistance, causing the amplitude to decrease.

Multiple choice physics free, damped and forced oscillations melde's experiment free, forced and damped oscillations sonometer and laws of transverse vibrations

In Meldes experiment, the tuning fork is arranged in the parallel position. During $200$ vibrations of the tuning fork, the string ccompletes vibrations

  1. $200$
  2. $100$
  3. $50$
  4. $25$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

In the parallel position, the string completes one full vibration for every one vibration of the tuning fork, because the tension is varied at twice the frequency of the fork.

Multiple choice physics free, damped and forced oscillations melde's experiment free, forced and damped oscillations sonometer and laws of transverse vibrations

The fundamental frequency of sonometer wire is 600Hz. When length wire is shorted by 25%, the frequency of ${ 1 }^{ st }$ overtone will be

  1. 800 Hz

  2. 1200 HZ

  3. 1600 Hz

  4. 2000 Hz
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Fundamental frequency f = v / 2L. If length is shortened by 25%, L_new = 0.75L = 3/4 L. New fundamental frequency f_new = f / (3/4) = 4/3 * 600 = 800 Hz. The 1st overtone is the 2nd harmonic, which is 2 * f_new = 2 * 800 = 1600 Hz.

Multiple choice economics fundamental concepts and terminologies savings, investment, wealth, welfare and business cycle fundamental duties and directive principles fundamental duties and directive principles of state policy

__________ are of regular nature and repeat themselves after a fixed interval of time.

  1. Periodic variations

  2. Oscillatory variations

  3. (a) or (b)

  4. Irregular variations
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Periodic variations occur after a fixed interval or period of time. They happen repeatedly. In economics, periodic variations can be found in production and consumption.

Multiple choice evs - i communication and mass media understanding communication and impact of mass media satellites in communication importance of transport system artificial satellite

The frequency of transmission of a ratio station is $30\, MHz$. The wavelength of the waves transmitted by the centre will be- 

  1. $5$ meter
  2. $10$ meter
  3. $15$ meter
  4. $20$ meter
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The wavelength lambda is calculated using the formula lambda = c / f, where c is the speed of light (3 * 10^8 m/s) and f is the frequency (30 MHz = 30 * 10^6 Hz). Thus, lambda = (3 * 10^8) / (3 * 10^7) = 10 meters.

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_______ is a communication instrument that produces sound at a distance by means of electricity.

  1. Internet

  2. Telephone

  3. Fax

  4. Computer
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The telephone is the classic communication instrument designed to transmit sound over distances using electrical signals.