Questions
A woman’s voice is shriller than a man’s voice due to _____.
- higher resonance
- higher wavelength
- higher frequency
- lower wavelength
A sound wave is travelling from East to West. In which direction do the molecules in the air move?
- East to west
- West to east
- North to south
- South to North
- Molecule will remain at rest.
The loudness of sound is determined by its
- frequency
- wavelength
- amplitude
- resonance
Which of the following is known as Mach number?
- It is the ratio of speed of an object moving through a fluid to the local speed of sound in that fluid.
- It is the range of audibility.
- It is the range of soothing sound measured in dB.
- Sounds with frequencies more than 20,000 Hz are called ultrasonic waves.
- It is the speed of sound in air at 0oC.
Which of the following does not affect the loudness of a sound?
- Amplitude of sound wave
- Distance from the source
- Shape of a vibrating body
- Density of the medium
- Presence of resonant body
Which of the following statements are correct for sound?
(a) Sound is produced whenever a body vibrates in a medium.
(b) The speed of sound does not depend on the elasticity of the medium.
(c) They are called as mechanical waves.
(d) The speed of sound is not affected by the change in pressure.
- Both (a) and (b)
- Both (a) and (c)
- Both (b) and (c)
- Both (b) and (d)
- Both (a) and (d)
In which of the following media does sound travel faster at 250C temperature?
- Aluminium
- Nickel
- Steel
- Iron
Which of the following is not a harmful effect of noise pollution?
- Hypertension
- Anxiety
- Deafness
- Asthma
- Insomnia
Which part of the ear helps us to hear sounds of audible frequency?
- Pinna
- Semi-circular canals
- Malleus
- Tympanic membrane
- Eustachian tube
We can hear sound when a body is in a _____ state.
- vibrating
- solid
- liquid
- gaseous
Which of the following correctly defines the intensity of sound?
- It is defined as number of vibrations per second.
- It is defined as one complete cycle of the periodic motion of the particle of the medium.
- It is defined as the maximum displacement of a particle of vibrating body producing sound.
- It is defined as the amount of sound energy passing per second through unit area.
- It is defined as the distance between two consecutive compressions or rarefactions.
In which of the following is the velocity of sound the maximum?
- Solids
- Liquids
- Gases
- Constant in all the mdeia
Which of the following is not a use of ultrasonic sound?
- To repel mosquitoes and other insects
- To scan and get images of inner body parts
- To detect cracks in metal blocks
- Drum beats for mass drill in a school
- In sonars used in ships
Which of the following statements about sound is incorrect?
- Sound needs a medium to travel.
- Speed of sound is fastest in gases and slowest in solids.
- Sound of frequency below the audible range is called infrasonic sound.
- Excessive sound in the environment causes noise pollution.
- Sound is produced by vibrating objects.
Which of the following helps to carry impulses of sound waves to the brain so that we can perceive sounds?
- Auditory nerve
- Vocal cord
- Ear drum
- Auditory canal
- Eustachian tube
Many explosions occur in stars in distant galaxies. But, why cannot we hear them?
- Sound cannot travel through vaccum.
- The sounds get absorbed in the star itself.
- These sounds get diverted away from earth.
- Sun absorbs these sounds.
- Rotation of the earth on its axis avoids these sounds.
Sounds waves can be produced
- only in solids
- only in liquids
- only in gases
- in solid, liquids and gases
Which of the following is a good example to show that light can travel much faster than sound in air?
- A movie and its sound effects inside a movie theatre
- Lights and crackers during festival time
- Thunder and lightning
- People talking around a camp fire
- Streetlight and sounds of people talking
The working principle of stethoscope used by a doctor is
- reflection of sound
- refraction of sound
- elasticity of sound
- pressure of sound
Which of the following has the highest pitch of voice?
- Man
- Woman
- Mosquito
- Dog
What is the speed of sound in vaccum at room tempertaure?
- 330 m/s
- 100 m/s
- zero
- infinity
Sound waves are
- electromagnetic waves
- electronic waves
- radio waves
- longitudinal waves
The sound used in SONAR system is
- audible
- musical
- infrasonic
- ultrasonic
Sound with the frequency range of 20 Hertz to 20,000 Hertz is called
- audible sound
- ultrasonic sound
- infrasonic sound
- noise
- tympanum
In which of the following forms can sound exist?
(a) Matter
(b) Particle
(c) Energy
(d) Wave
- Both (a) and (b)
- Both (a) and (c)
- Both (b) and (c)
- Both (c) and (d)
- Both (b) and (d)