{"id":16878,"date":"2021-08-19T20:08:31","date_gmt":"2021-08-19T14:38:31","guid":{"rendered":"https:\/\/apboardsolutions.guru\/?p=16878"},"modified":"2021-09-15T21:19:47","modified_gmt":"2021-09-15T15:49:47","slug":"ap-9th-class-physical-science-bits-chapter-11","status":"publish","type":"post","link":"https:\/\/apboardsolutions.guru\/ap-9th-class-physical-science-bits-chapter-11\/","title":{"rendered":"AP 9th Class Physical Science Bits Chapter 11 Sound with Answers"},"content":{"rendered":"

Practice the AP 9th Class Physical Science Bits with Answers<\/a> Chapter 11 Sound on a regular basis so that you can attempt exams with utmost confidence.<\/p>\n

AP State Syllabus 9th Class Physical Science Bits 11th Lesson Sound with Answers<\/h2>\n

Question 1.
\nSound travels in the air in the form of
\nA) pulses
\nB) corpuscules
\nC) waves
\nD) particles
\nAnswer:
\nC) waves<\/p>\n

Question 2.
\nLongitudinal waves involves change in …………………. of the medicine.
\nA) density
\nB) shape
\nC) velocity
\nD) temperature
\nAnswer:
\nA) density<\/p>\n

\"AP<\/p>\n

Question 3.
\nTransverse waves involves change in ………………. of the medium.
\nA) density
\nB) shape
\nC) velocity
\nD) temperature
\nAnswer:
\nB) shape<\/p>\n

Question 4.
\nLongitudinal wave of the following is
\nA) light wave
\nB) water wave
\nC) sound wave
\nD) none
\nAnswer:
\nC) sound wave<\/p>\n

Question 5.
\nThe maximum disturbance of particles in the medium on either side of mean position is called
\nA) wavelength
\nB) frequency
\nC) wave speed
\nD) amplitude
\nAnswer:
\nD) amplitude<\/p>\n

Question 6.
\nThe time taken for one oscillation is called
\nA) frequency
\nB) time period
\nC) wavelength
\nD) wave speed
\nAnswer:
\nB) time period<\/p>\n

Question 7.
\nThe matter or the substance through which sound is transmitted is called the …………………
\nA) object
\nB) medium
\nC) substance
\nD) quantity
\nAnswer:
\nB) medium<\/p>\n

Question 8.
\nThe distance between two consecutive compressions is ……………….
\nA) speed
\nB) wavelength
\nC) frequency
\nD) time period
\nAnswer:
\nB) wavelength<\/p>\n

Question 9.
\nWhen a sound wave travels in air …………….. and ……………… of air at a place varies.
\nA) volume, density
\nB) pressure, volume
\nC) density, pressure
\nD) frequency, speed
\nAnswer:
\nC) density, pressure<\/p>\n

\"AP<\/p>\n

Question 10.
\nThe regions where the density and pressure of particles is high are called as …………………
\nA) crusts
\nB) troughs
\nC) compressions
\nD) rarefactions
\nAnswer:
\nC) compressions<\/p>\n

Question 11.
\nThe regions where the density and pressure of particles is low are called as ………………….
\nA) crusts
\nB) troughs
\nC) compressions
\nD) rarefactions
\nAnswer:
\nD) rarefactions<\/p>\n

Question 12.
\nSound waves are ……………….. waves.
\nA) stationary
\nB) longitudinal
\nC) transverse
\nD) electromagnetic
\nAnswer:
\nB) longitudinal<\/p>\n

Question 13.
\nIf the particles of the medium vibrate along the direction of wave, then the wave is called a …………………..
\nA) longitudinal
\nB) transverse
\nC) stationary
\nD) electromagnetic
\nAnswer:
\nA) longitudinal<\/p>\n

Question 14.
\nThe unit of wavelength in S.l. system is …………………..
\nA) metre
\nB) hertz
\nC) decibel
\nD) m\/s
\nAnswer:
\nA) metre<\/p>\n

Question 15.
\nThe unit of frequency of wave is ………………….
\nA) metre
\nB) hertz
\nC) decibel
\nD) second
\nAnswer:
\nB) hertz<\/p>\n

Question 16.
\nRelation between time period (T) and frequency (\u03c5) is …………………..
\nA) T = \\(\\frac{1}{\u03c5}\\)
\nB) \u03c5 = \\(\\frac{1}{\\mathrm{~T}}\\)
\nC) \u03c5 = T
\nD) Both A & B
\nAnswer:
\nD) Both A & B<\/p>\n

Question 17.
\nRelation between speed of sound, frequency and wavelength is ………………
\nA) v = \u03bb\u03c5
\nB) \u03c5 = v\u03bb
\nC) \u03bb = v\u03c5
\nD) \u03bbv\u03c5 = 1
\nAnswer:
\nA) v = \u03bb\u03c5<\/p>\n

\"AP<\/p>\n

Question 18.
\nSpeed of sound in water at 20\u00b0C = …………………
\nA) 330 m\/s
\nB) 5500 m\/s
\nC) 1484 m\/s
\nD) 220 m\/s
\nAnswer:
\nC) 1484 m\/s<\/p>\n

Question 19.
\nSpeed of sound in air at 20\u00b0C is ……………….
\nA) 343.2 m\/s
\nB) 1236 km\/hr
\nC) 330 m\/s
\nD) Both A & B
\nAnswer:
\nD) Both A & B<\/p>\n

Question 20.
\nPitch of sound depends on …………….
\nA) frequency
\nB) amplitude
\nC) wavelength
\nD) none of these
\nAnswer:
\nA) frequency<\/p>\n

Question 21.
\nLoudness of sound depends on …………………..
\nA) frequency
\nB) amplitude
\nC) wavelength
\nD) none of these
\nAnswer:
\nB) amplitude<\/p>\n

Question 22.
\nReflection of sound will be better on ………………. surface than …………….. surface.
\nA) smooth, rough
\nB) rough, smooth
\nC) inclined, inverted
\nD) straight, inclined
\nAnswer:
\nB) rough, smooth<\/p>\n

Question 23.
\nSONAR stands for …………………..
\nA) Sonographic Navigation And Ranging
\nB) Sonographic Notation And Rating
\nC) Sound Notation And Rating
\nD) Sound Navigation And Rating
\nAnswer:
\nA) Sonographic Navigation And Ranging<\/p>\n

Question 24.
\nRegion of low dense particles ………………….
\nA) compression
\nB) rarefaction
\nC) crust
\nD) trough
\nAnswer:
\nB) rarefaction<\/p>\n

\"AP<\/p>\n

Question 25.
\nRegion of high dense particles is ………………
\nA) compression
\nB) rarefaction
\nC) crust
\nD) trough
\nAnswer:
\nA) compression<\/p>\n

Question 26.
\nNumber of oscillations in one second is called ……………………
\nA) wavelength
\nB) frequency
\nC) time period
\nD) amplitude
\nAnswer:
\nB) frequency<\/p>\n

Question 27.
\nMaximum variation in the density is ………………
\nA) wavelength
\nB) frequency
\nC) time period
\nD) amplitude
\nAnswer:
\nD) amplitude<\/p>\n

Question 28.
\nDistance between two consecutive compressions is …………………..
\nA) wavelength
\nB) frequency
\nC) time period
\nD) amplitude
\nAnswer:
\nA) wavelength<\/p>\n

Question 29.
\nSound is produced by
\nA) any body
\nB) vibrating body
\nC) a body in motion
\nD) bodies having different shapes
\nAnswer:
\nB) vibrating body<\/p>\n

Question 30.
\nThe characteristic of sound which distinguishes between a shrill sound and a growling sound is
\nA) pitch
\nB) loudness
\nC) quality
\nD) amplitude
\nAnswer:
\nA) pitch<\/p>\n

Question 31.
\nLoudness of sound is measured in
\nA) Hertz
\nB) Meters
\nC) Decibels
\nD) Seconds
\nAnswer:
\nC) Decibels<\/p>\n

\"AP<\/p>\n

Question 32.
\nThe audible range of frequency for an average person is
\nA) 20 Hz – 200 Hz
\nB) 20 Hz – 20 kHz
\nC) 2 kHz – 20 kHz
\nD) 2000 Hz – 200 kHz
\nAnswer:
\nB) 20 Hz – 20 kHz<\/p>\n

Question 33.
\nThe loudness of sound is considered normal if it is between ………………
\nA) 50 dB to 60 dB
\nB) 80 dB
\nC) 20 dB
\nD) more than 120 dB
\nAnswer:
\nA) 50 dB to 60 dB<\/p>\n

Question 34.
\nThe decibel level of jet engine taking off is ……………..
\nA) 80 dB
\nB) 100 dB
\nC) 120 dB
\nD) 60 dB
\nAnswer:
\nC) 120 dB<\/p>\n

Question 35.
\nStatement – I : If frequency of sound is less than 20 Hz, then they are called infrasonic sounds.
\nStatement – II : If frequency of sound is more than 20 Hz, then they are called infrasonic sounds.
\nA) Both the statements I & II are true.
\nB) Statement -1 is true and statement -II is false.
\nC) Statement -1 is false and statement – II is true.
\nD) Both the statements I & II are false.
\nAnswer:
\nA) Both the statements I & II are true.<\/p>\n

Question 36.
\nQuality of a musical note depends on ……………….
\nA) instrument
\nB) wavelength
\nC) frequency
\nD) wave form
\nAnswer:
\nD) wave form<\/p>\n

Question 37.
\nSound of frequency less than 20 Hz is known as …………….. sound.
\nA) infrasonic
\nB) ultrasonic
\nC) echo
\nD) reverberation
\nAnswer:
\nA) infrasonic<\/p>\n

\"AP<\/p>\n

Question 38.
\nSound of frequency greater than 20 kHz is known as ………………..
\nA) infrasonic
\nB) ultrasonic
\nC) echo
\nD) audible range
\nAnswer:
\nB) ultrasonic<\/p>\n

Question 39.
\nThe sounds heard by bat is upto …………….
\nA) 50 KHz
\nB) 25 KHz
\nC) 100 KHz
\nD) 5 KHz
\nAnswer:
\nC) 100 KHz<\/p>\n

Question 40.
\nThe maximum limit sounds heard by dog is ………………….
\nA) 50 KHz
\nB) 25 KHz
\nC) 100 KHz
\nD) 5 KHz
\nAnswer:
\nA) 50 KHz<\/p>\n

Question 41.
\nThe unit for intensity of sound is ……………….
\nA) hertz
\nB) metre
\nC) m\/s
\nD) decibel
\nAnswer:
\nD) decibel<\/p>\n

Question 42.
\nAdjacent picture is one of application of
\n\"AP
\nA) Sound
\nB) Ultrasound
\nC) SONAR
\nD) All
\nAnswer:
\nB) Ultrasound<\/p>\n

Question 43.
\nAdjacent picture represent the phenomenon of
\n\"AP
\nA) Sound
\nB) Ultrasound
\nC) SONAR
\nD) All
\nAnswer:
\nC) SONAR<\/p>\n

Question 44.
\nEcho is a reflected sound, reaches our ear, after direct sound in
\nA) lessthan 0.1s
\nB) more than 0.1s
\nC) exactly at 0.1s
\nD) any time
\nAnswer:
\nB) more than 0.1s<\/p>\n

\"AP<\/p>\n

Question 45.
\nUsing ultrasounds in the imaging of organs like liver, uterus, etc. is called as
\nA) radiography
\nB) echography
\nC) ultrasonography
\nD) magnetic resonance imaging
\nAnswer:
\nC) ultrasonography<\/p>\n

Question 46.
\nThe location of under water objects can be determined by using
\nA) SONAR
\nB) Ultrasound
\nC) X-ray
\nD) Light waves
\nAnswer:
\nA) SONAR<\/p>\n

Question 47.
\nA tabla and a guitar are played at a time. We can identify the sound from which instrument it is coming by the character of
\nA) pitch
\nB) loudness
\nC) quality
\nD) wave speed
\nAnswer:
\nC) quality<\/p>\n

Question 48.
\nIf the particles of the medium vibrate perpendicular to the direction of wave, then the wave is called a …………………
\nA) longitudinal
\nB) transverse
\nC) stationary
\nD) electromagnetic
\nAnswer:
\nB) transverse<\/p>\n

Question 49.
\nAs age increases, the audible range of frequency of sound …………………
\nA) increases
\nB) decreases
\nC) both A & B
\nD) none of these
\nAnswer:
\nB) decreases<\/p>\n

Question 50.
\nWhile using SONAR, ……………….. can be utilised to determine the shape and size of the object.
\nA) refraction from various positions
\nB) reflection from various angles
\nC) both A & B
\nD) none of these
\nAnswer:
\nB) reflection from various angles<\/p>\n

Question 51.
\nWhich of the following is not a characteristic of musical sound ?
\nA) Wavelength
\nB) Pitch
\nC) Loudness
\nD) Quality
\nAnswer:
\nC) Loudness<\/p>\n

Question 52.
\nSound travels in a medium means
\nA) The medium travels
\nB) The particles of the medium travels
\nC) The sound travels
\nD) The disturbance travels
\nAnswer:
\nD) The disturbance travels<\/p>\n

\"AP<\/p>\n

Question 53.
\n\"AP
\nWhich Note has more pitch?
\nA) Sa
\nB) re
\nC) ga
\nD) ma
\nAnswer:
\nD) ma<\/p>\n

Question 54
\nIdentify the wrong pair among the following.
\nA) (Pitch, Frequency)
\nB) (Echo, Refraction)
\nC) (Quality, Waveform)
\nD) (Loudness, Amplitude)
\nAnswer:
\nB) (Echo, Refraction)<\/p>\n

Question 55.
\nAssume that the atmosphere is absent on earth, then the velocity of the sound wave in this situation is
\nA) 3 \u00d7 108<\/sup> ms-1<\/sup>
\nB) 331.2 ms-1<\/sup>
\nC) 3 \u00d7 10-8<\/sup> ms-1<\/sup>
\nD) doesn\u2019t propagate
\nAnswer:
\nD) doesn\u2019t propagate<\/p>\n","protected":false},"excerpt":{"rendered":"

Practice the AP 9th Class Physical Science Bits with Answers Chapter 11 Sound on a regular basis so that you can attempt exams with utmost confidence. AP State Syllabus 9th Class Physical Science Bits 11th Lesson Sound with Answers Question 1. Sound travels in the air in the form of A) pulses B) corpuscules C) …<\/p>\n","protected":false},"author":4,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"spay_email":""},"categories":[12],"tags":[],"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/apboardsolutions.guru\/wp-json\/wp\/v2\/posts\/16878"}],"collection":[{"href":"https:\/\/apboardsolutions.guru\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/apboardsolutions.guru\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/apboardsolutions.guru\/wp-json\/wp\/v2\/users\/4"}],"replies":[{"embeddable":true,"href":"https:\/\/apboardsolutions.guru\/wp-json\/wp\/v2\/comments?post=16878"}],"version-history":[{"count":0,"href":"https:\/\/apboardsolutions.guru\/wp-json\/wp\/v2\/posts\/16878\/revisions"}],"wp:attachment":[{"href":"https:\/\/apboardsolutions.guru\/wp-json\/wp\/v2\/media?parent=16878"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/apboardsolutions.guru\/wp-json\/wp\/v2\/categories?post=16878"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/apboardsolutions.guru\/wp-json\/wp\/v2\/tags?post=16878"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}