Acoustics Gk Questions Answers English

Top Acoustics Gk Questions Answers In English For All Competitive Exams. You Will Read The Top Question And Answer Related To Acoustics In This Post. This Can Be Asked In Any Competitive Exams, Must Read Once.

Acoustics Gk Questions Answers In English

Q1.Decibel unit is used?

1. for loudness of sound
2. for frequency of radio waves
3. to the speed of light
4. For heat intensity

Q2.Which of the following statement is true for sound waves?

1. it can run in vacuum
2. At 0°C their speed is 332m per second
3. these can be polarized
4. All the above statements are true

Q3.What is the nature of sound waves?

1. progressive
2. electromagnetic
3. transverse
4. longitudinal

Q4.The sound intensity of a musical instrument is measured by-

1. Lux
2. in decibels
3. Maho
4. Henry

Q5.What is the frequency of infrared waves?

1. over 20,000 Hz
2. less than 20 hertz
3. less than 20Hz
4. over 20 Hz

Q6.Which of the following property of sound is affected by change in temperature of air?

1. Frequency
2. Intensity
3. wavelength
4. extension

Q7. Ultrasonic waves are those sound waves whose frequency is-

1. is more than 20 kHz
2. is less than 20 Hz
3. is between 20 Hz and 1000Hz
4. between 1000 Hz and 20000 Hz

Q8.On hearing the roaring of the clouds, the person opens his mouth so that-

1. get more sound
2. to blow air out of the mouth
3. get away the fear
4. To equalize the air pressure on the eardrum of both ears

Q9. Ultrasonic waves by humans-

1. can’t be heard
2. can be heard
3. Sometimes Can Be Heard
4. none of these

Q10.The instrument used to detect submerged objects is called?

1. Kavasar
2. Spandak
3. radar
4. sonar

Q11.Who was the first to generate ultrasonic waves by playing the whistle?

1. Hertz
2. Faraday
3. Newton
4. Galton

Q12.The standard sound level for humans is-

1. 120DB
2. 100DB
3. 90DB
4. 60DB

Q13.Which phenomenon do bats or dolphins use to detect prey predators or obstacles?

1. Sound Scattering
2. determining the echo
3. refraction of sound
4. making of blasters

Q14.Acoustic science is-

1. related to climate
2. Metals
3. related to light
4. related to sound

Q15.Insects and harmful elements are used to drive away from homes?

1. infrared wave
2. subsonic wave
3. ultrasonic wave
4. radio wave

Q16.Echo sounding is used?

1. to increase the frequency of the sound
2. To measure the depth of the sea
3. to produce vibrations in sound
4. none of the above

Q17. On what does the pitch of sound depend?

1. Velocity
2. Dimensions
3. Frequency
4. Intensity

Q18.The instrument which is used for the detection and feasibility of sound waves is called?

1. sonar
2. call
3. radar
4. none of the above

Q19.Which is used for cleaning interiors of aircraft?

1. inaudible
2. carbon dioxide
3. ultrasonic wave
4. Oxalic Acid

Q20.Sound waves cannot travel-

1. in the gaseous medium
2. in the vacuum
3. in solid medium
4. in the fluid medium

Q21.20 Hz to 20,000 Hz What is the frequency of sound?

1. hypersonic
2. audible or audible sound
3. ultrasound
4. Infrasonics

Q22.While shouting, a person always keeps the palm close to the mouth because-

1. Vocational tone increases
2. This action has no effect on sound
3. In that case the sound energy would only point in one direction
4. Sound perfection increases of sound

Q23. The relation between velocity (v) of wave frequency (n) and wavelength (λ) is given by-

1. v=n-λ
2. v=n+λ
3. v=nλ
4. v=n/λ

Q24.Which waves cannot propagate in zero-

1. Sound
2. electromagnetic
3. light
4. heat

Q25. Explosion is not heard far from the surface on the moon-

1. Because of the Moon’s low gravity
2. Because of the low intensity of sound waves
3. causes of the absence of atmosphere
4. none of the above

Q26.A biological method in which ultrasonic sound is used?

1. EEG
2. X-ray
3. sonography
4. ECG

Q27.Bats can fly in the dark because-

1. they produce very strong sound waves that control it
2. any bird can do this
3. he sees clearly in the dark
4. the pupil of his eye is too big

Q28. In which medium the speed of sound will be maximum at about 20°C?

1. water
2. iron
3. air
4. Granite

Q29. The speed of sound in air is 332 meters per second. If the pressure is doubled, the speed of sound will be

1. 166 m/s
2. 100 m/s
3. 664 m/s
4. 332 m/s

Q30.A jet aircraft is flying in the air with a velocity of Mach 2 when the velocity of sound is 332m/s then what is the speed of the aircraft?

1. 332 m/s
2. 664 m/s.
3. 166 m/s.
4. 66.4m/s.

Q31.Sound travels fastest in which of the following matter?

1. in the vacuum
2. in the water
3. in steel
4. in the air

Q32.Which one of the following has the highest speed of sound?

1. in the water
2. in the wood
3. in 0°C air
4. In air at 100°C

Q33.The thunder of clouds is heard after a long time after the flash of lightning is because of this?

1. light can travel in vacuum but sound cannot
2. The speed of light is greater than the speed of sound
3. Clouds block sound waves
4. The thunder comes later

Q34.Which of the following type of wave is used in night vision equipment?

1. microwave
2. radio wave
3. infrared wave
4. none of the above

Q35.The velocity of sound in air is approximately-

1. 110 m/s
2. 232 m/s
3. 332 m/s
4. 220m/s

Q36.Which of the following statements is not correct?

1. Sound waves with higher amplitudes are relatively stronger
2. Sound waves with higher audible frequencies are sharper
3. The nature of sound waves in gases is longitudinal
4. Sound waves of frequency less than 20 Hz are relatively strong

Q37.What is the fastest speed of sound waves?

1. Gas
2. in the air
3. from solids
4. in liquid

Q38.Which of the following statements is correct Velocity of sound-

1. Solids have maximum and liquids have minimum
2. Solids have maximum and gases have minimum
3. does not depend on the nature of the medium
4. Gasses have maximum and liquids have minimum

Q39.Velocity of sound in different medium-

1. variance varies and liquid has the least
2. Variable varies and is highest in gas
3. similar to
4. Variance is maximum in solid

Q40. The velocity of sound in humid air is greater than that of dry air, because in moist air-

1. pressure is higher than that of dry air
2. Less pressure than dry air
3. Density is higher than that of dry air
4. density is less than that of dry air

Q41. ​​In which medium the speed of sound will be maximum at a temperature of about 20°C?

1. water
2. iron
3. air
4. granite

Q42.The frequency or sharpness of an approaching train increases due to which phenomenon?

1. Charles Law
2. Archimedes’ Law
3. Big Bang Theory
4. Doppler Effect

Q43.Which one of the following statements is not correct?

1. The velocity of sound in air decreases with increase in humidity
2. The velocity of sound in air is not affected by the change of amplitude and frequency
3. Velocity of sound in air increases with increase in temperature
4. Velocity of sound in air does not depend on pressure

Q44. Doppler effect is related to?

1. psychology
2. currency circulation
3. Sound
4. population

Q45.Velocity of sound in air-

1. Temperature does not depend on
2. decreases as temperature decreases
3. decreases with rise in temperature
4. increases as temperature decreases

Q46.The fluctuation in the frequency of a sound source is called?

1. The Crampton Effect
2. photoelectric effect
3. Raman Effect
4. Doppler Effect

Q47. Supersonic planes fly-

1. faster than the speed of sound
2. at the speed of light
3. at the speed of sound
4. less than the speed of sound

Q48. When we are sitting inside the room, although we do not see the people talking in the same room, but we do hear their voice. This is because of sound-

1. interference
2. diffraction
3. reflection
4. refraction

Q49. The ratio of the velocity of an object to that of sound through the same medium and under the same conditions is called-

1. octane number
2. Mac Number
3. permanence number
4. lamlas number

Q50. High light houses are built at places in the sea, from where signals are sent to ships by playing big sirens, sometimes the ships reach the silent area where the sound of siren is not heard Due to which property of sound waves are these noiseless fields created?

1. refraction
2. resonance
3. reflection
4. interference

Q51. Mach numbers are used in relation to velocity-

1. aircraft
2. Spacecraft
3. Sound of
4. Ship’s

Q52. When two loudspeakers are played together at a place, the listener sitting at a particular place does not hear their sound because of this?

1. refraction
2. resonance
3. reflection
4. interference

Q53.Noise or noise pollution is measured in-

1. in decibels
2. in decimal
3. in the fun
4. in desi

Q54. The tuning station of radio is an example?

1. interference
2. refraction
3. reflection
4. resonance

Q55.What is the intensity of the sound of ordinary conversation?

1. 50-60 decibels
2. 90-100 decibels
3. 20-30 decibels
4. 30-40 decibels

Q56.When we keep the jug under water to fill, we hear a special kind of sound as the jug is filled, the reason for this is-

1. resonance
2. reflection
3. diffraction
4. interference

Q57.The characteristic of sound that differentiates a female sound from a male sound is called?

1. Quality
2. strongness
3. Temperature
4. Phase

Q58. It is said that when Tansen used to sing, the glass of the window or the glass of the glass used to break into pieces, if it is possible, it would be due to which quality of sound?

1. resonance
2. interference
3. reflection
4. refraction

Q59. Which characteristic of sound makes a sound thick or thin?

1. Pitch
2. Quality
3. Intensity
4. none of these

Q60.We listen to the programs of different stations by tapping the radio, it is possible-

1. Reason of Personification
2. due to diffraction
3. Resonance Reasons
4. Because of Vispand

Q61.Women’s voice is louder than men’s because of women’s voice-

1. the pitch is low
2. high pitch
3. Dimension is less
4. dimension is greater

Q62. When the army crosses the bridge, the soldiers are instructed not to walk step by step because-

1. There is a danger of breaking the bridge due to the resonance of the sound produced by the feet
2. There is a risk of bridge breaking due to the Doppler effect
3. Increased pressure puts the bridge at risk of breaking
4. none of these

Q63.Why is the voice of a young child preferred to the voice of a young man?

1. The pitch of a child’s voice is higher than that of a man’s voice
2. Children have more power
3. The pitch of a child’s voice is lower than that of a man’s voice
4. none of the above

Q64. DEAD Hall has what time period?

1. 1.8 seconds
2. 8 seconds
3. zero seconds
4. 0.8 sec

Q65.Women’s voice is thinner than men’s because women’s voice-

1. has more dimension
2. velocity is high
3. Frequency is high
4. has longer wavelength

Q66.The relation between the replication time and the volume of the hall is presented in-

1. Sabin
2. Laplace’s
3. Doppler
4. Newton

Q67.If the same note is played on sitar and flute, then the sound produced by them can be differentiated because of the difference in the following?

1. Sound loudness only
2. Sound quality only
3. Temperature Strength and Quality
4. Tightness and loudness only

Q68.Sonar is mostly used?

1. by engineers
2. by navigations
3. by astronauts
4. by doctors

Q69.Which one of the following is not produced by sound waves in air-

1. reflection
2. refraction
3. polarization
4. diffraction

Q70.On which principle of sound does a stethoscope work?

1. diffraction
2. polarization
3. reflection
4. refraction

Q71.The maximum limit of sound intensity in decibels above which a person cannot hear-

1. 85Db
2. 95Db
3. 50Db
4. 70Db

Q72.How far should a person stand from the reflecting plane to hear his echo

1. 28ft
2. 100 feet
3. 224 ft
4. 56ft

Q73.Which of the following causes maximum noise pollution?

1. pop music
2. Flying an airplane
3. Motor Car
4. Railway Engine

Q74.Sound waves produce resonance due to?

1. diffraction
2. refraction
3. reflection
4. none of these

Q75.The sound of the city of an approaching train increases while it decreases for a distant train. This phenomenon is an example-

1. The Crampton Effect
2. Doppler Effect
3. Raman Effect
4. The Joule Thomson Effect

Q76.How long does the effect of sound last in human ear?

1. 1/20 second
2. 1/2 second
3. 1/5 sec
4. 1/10 second

Q77. An astronaut cannot hear his classmate on the surface of the moon because-

1. Sound is not a medium for propagation
2. There are many craters on the surface of the moon
3. The frequency produced is greater than the sound frequency
4. The temperature is very low at night and extreme in the day

Q78.The working of radar is based on which principle?

1. Doppler Effect
2. Raman Effect
3. refraction of radio waves
4. reflection of radio waves

Q79. Which process does not occur in both light and sound?

1. polarization
2. refraction
3. diffraction
4. reflection

Q80.Why do people always keep their palms near the mouth while shouting?

1. Vocational tone increases
2. This action has no effect on sound
3. In that case the sound energy would point in only one direction
4. Sound perfection increases of sound