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This section includes InterviewSolutions, each offering curated multiple-choice questions to sharpen your knowledge and support exam preparation. Choose a topic below to get started.
| 251. |
In which medium sound travels faster : air or iron? |
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Answer» The speed of sound is faster in solid as compared to gas. Thus, the speed of sound is more in iron. |
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| 252. |
Sound travels fastest in …………….. (A) water (B) air (C) steel (D) kerosene oil |
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Answer» Correct option is: (C) steel |
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| 253. |
Which of the following is the speed of sound in water and which in steel? (a) 5000 m/s (b) 1500 m/s (c) 340 m/s |
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Answer» The speed of sound is faster in solid as compared to liquid, and then slowest in gases. Thus, the speed of sound is more in steel, then water and then air. (a) 5000 m/s – Speed of sound in steel. (b) 1500 m/s – Speed of sound in water. (c) 340 m/s – Speed of sound in air. |
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| 254. |
Out of solids, liquids, and gases: a) in which medium sound travels slowest? b) in which medium sound travels fastest? |
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Answer» a) Sound travels slowest in gases b) Sound travels fastest in solids |
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| 255. |
Which of the following travels slowest in air and which one fastestSupersonic aircraft, light, sound |
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Answer» Slowest is the sound Fastest is the light |
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| 256. |
In which medium sound travels fastest : air, water or steel? |
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Answer» The speed of sound is faster in solid as compared to liquid, and then slowest in gases. Thus, the speed of sound is more in steel, then water and then air. |
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| 257. |
What is the speed of sound in air? |
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Answer» The speed of sound in air is 343 m/s. |
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| 258. |
Out of solids, liquids and gases : (a) in which medium sound travels slowest? (b) in which medium sound travels fastest? |
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Answer» (a) Sound travels slowest in gas medium (b) Sound travels fastest in solid medium. |
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| 259. |
The sound waves travel fastest:A. in solidsB. in liquidsC. in gasesD. in vacuum |
| Answer» Correct Answer - A | |
| 260. |
The sound waves travel fastest: a) in solids b) in liquids c) in gases d) in vacuum |
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Answer» The correct answer is a) in solids |
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| 261. |
In which of the three media : air, water or iron , does sound travel the fastest at a particular temperature ? |
| Answer» The sound travels the fastest in a solid medium. Out of air, water and iron, iron is a solid, therefore, sound travels fastest in iron. | |
| 262. |
The maximum speed of vibrations which produce audible sound will be in: A. dry air B. sea water C. ground glass D. human blood |
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Answer» C. ground glass The sound travels faster in solids than liquids than gases. |
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| 263. |
The speeds of sound in four different media are given below. Which of the following is the most likely speed in m/s with which the two under water whales in a sea talk to each other when separated by a large distance ? A. 340 B. 5170 C. 1280 D. 1530 |
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Answer» D. 1530 1530 |
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| 264. |
The sound waves travel fastest: A. in solids B. in liquids C. in gases D. in vacuum |
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Answer» A. in solids The sound travels faster in solids than liquids than gases. |
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| 265. |
What is the upper limit of frequency of human hearing? |
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Answer» 20,000 Hz is the upper limit of frequency of human hearing. |
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| 266. |
What is the lower limit of frequency of human hearing? |
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Answer» 20Hz is the lower limit of frequency of human hearing. |
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| 267. |
20Hz is the lower limit of frequency of human hearing. |
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Answer» Bats can produce ultrasonic sounds. |
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| 268. |
What is mean by longitudinal wave. |
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Answer» A wave in which the particles of the medium vibrate back and forth in the same direction in which the wave is moving, is called a longitudinal wave. |
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| 269. |
Define the term time period and amplitude. |
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Answer» Time Period : (a) Time taken to complete one vibration is called time period. (b) Time required to pass two consecutive compressions or rarefactions through a point is called time period. • SI unit of time period is second (s). Time period is denoted by T. • The frequency of a wave is the reciprocal of the time period. V = 1/T Amplitude : The maximum displacement of the particle of the medium from their original undisturbed position is called amplitude of the wave. • Amplitude is denoted by A and its SI unit is metre (m). |
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| 270. |
What is a longitudinal wave ? |
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Answer» In a longitudinal wave, the particles of air vibrate to and fro about their mean positions in the direction of travel of sound. |
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| 271. |
Can two person hear each other on moon’s surface ? Give reason to support your answer. |
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Answer» No, we cannot hear each other since sound requires medium for transmission. It cannot travel through vacuum. |
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| 272. |
What makes these strings vibrate? |
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Answer» The vocal chords are stretched across the larynx and they vibrate to produce sound. |
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| 273. |
Fill in the following blanks with suitable words : (a) Sounds are produced by ………….. objects. (b) The human voice box is called ………….. (c) Sound cannot travel in ……………….. (d) A set of three tiny…………in the middle part of ear passes on sound vibrations from the eardrum to the liquid in the cochlea. (e) The unit of frequency is …………..(f) The time taken by an object to complete one oscillation is called………(g) The shrillness of a sound is determined by the ………..of vibration. (h) Unpleasant sound is called………………. (i) Sound which is pleasing to the ear is called…………….sound. (j) A person having partial hearing loss can hear properly by wearing a device called hearing ……………on the ear. |
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Answer» (a) Sounds are produced by vibrating objects. (b) The human voice box is called larynx (c) Sound cannot travel in vacuum (d) A set of three tiny bones in the middle part of ear passes on sound vibrations from the eardrum to the liquid in cochlea. (e) The unit of frequency is Hertz (Hz) (f) The time taken by an object to complete one oscillation is called time-period (g) The shrillness of a sound is determined by the frequency of vibration. (h) Unpleasant sound is called noise. (i) Sound which is pleasing to the ear is called musical sound. (j) A person having partial hearing loss can hear properly by wearing a device called hearing machine on the ear. |
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| 274. |
Describe an experiment to show that sound can travel in water. |
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Answer» Take a tub filled with water. Hold a bell in one hand and dip it in water. Keep one of your ears gently on the surface of water without letting water into the ear. Now ring the bell inside water. You will be able to hear the sound clearly. This shows that sound can travel through liquids. |
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| 275. |
What is the name of the strings in the human voice box which vibrate to produce sound? |
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Answer» The vocal chords of the human voice box vibrate to produce sound. |
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| 276. |
The bees do not have voice-boxes. How do they produce sound ? |
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Answer» The bees do not have the voice-boxes. Still they produce sound. This happens by the vibrations produced by the quick movement of their wings. Bees buzz while flying and depositing pollen among flowers. |
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| 277. |
How is sound produced ? |
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Answer» Sound is produced by vibrating bodies. |
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| 278. |
What is sound ? |
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Answer» Sound is a form of energy which produces the sensation of hearing. |
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| 279. |
What do you mean by a vibratory motion ? |
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Answer» The oscillatory motion in which the body assumes a new shape during its motion, is called the vibratory motion. |
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| 280. |
What do you mean by a vibratory motion. |
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Answer» The oscillatory motion in which the body assumes a new shape during its motion, is called the vibratory motion. |
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| 281. |
Define ‘frequency’ of a vibrating object. Name the unit in which frequency is measured. |
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Answer» The frequency is described as the number of vibrations or oscillations per second. Its unit is Hertz (Hz) |
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| 282. |
Give two causes of noise pollution from the homes. |
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Answer» The causes of noise pollution are as follows: 1. Televisions running at high volumes. 2. Use of Loudspeakers in religious or other functions. 3. Use of crackers. |
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| 283. |
Which of the following statements is correct ?A. The pitch changes with change in amplitude.B. The frequency of vibration determines the pitch of any sound.C. The voice of woman has low pitch when compared to that of a man.D. A tabla produces high pitch sound when compared to that of a flute. |
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Answer» Correct Answer - B The frequency of vibration determines the pitch of any sound. |
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| 284. |
Which of the following statements is correct ?A. The pitch of sound decreases with a decrease in the length of a vibrating air column.B. The pitch of sound increases with a decrease in the thickness of a vibrating string.C. The pitch of sound decreases with a decrease in the length of the vibrating string.D. The pitch of sound depends upon the amplitude of a vibrating body. |
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Answer» Correct Answer - B The pitch of sound increases with decrease in the thickness of a vibrating string. |
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| 285. |
Three persons `P_(1), P_(2)`, and `P_(3)` are at three different points A, B and C as shown in the figure. `P_(1)` and `P_(2)` clap at the same time. For `P_(3)` to hear two distinct claps, the minimum distance between `P_(1)` and `P_(2)` should be _______ m. (The velocity of sound in air is `330 ms^(-1)`) A. 33B. 330C. 363D. 660 |
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Answer» Correct Answer - A Human ear can hear two sounds separately only if they reach the ear after an interval of (1/10) of a second. So, the time taken by the sound from `P_(1)` to `P_(2)` should be greater than `(1//10) s = 0.1 s.` The minimum distance between `P_(1)` and `P_(2)` `= v xx t = 330 xx 0.1 = 33 m.` |
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| 286. |
What does the intensity of sound depend upon? |
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Answer» 1. The intensity of sound is proportional to the square of the amplitude of vibration, e.g. If the amplitude is doubled the intensity of sound becomes four times. 2. Therefore the loudness or softness of sound is dependent on the intensity of sound and sound level. |
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| 287. |
The relation between wave velocity (V), wave length and frequency (v) is: (A) V = vλ (B) λ= Vv (C) V =λv (D) V= λ/v |
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Answer» The answer is (A) V = vλ |
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| 288. |
The speed of sound in sea water is `1530 m//s`. The wavelength of a wave transmitted through the sea is `0.02 m`. Find its frequency. |
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Answer» Here, speed of sound in sea water, `v = 1530 m//s` wavelength of the wave transmitted, `lamda = 0.02 m` If `v` is the freqiency of wave transmitted, then `v = (v)/(lamda) = (1530)/(0.02) = 76500 Hz = 76.5 kHz`. |
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| 289. |
What is a vibration (or an oscillation)? Define ‘amplitude’ of vibration of an object. |
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Answer» The to- and – fro motion of an object in a medium is called vibration. Amplitude is the largest distance from the mean position of the object. |
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| 290. |
If the amplitude of the pendulum increases, then time period_________.A. increasesB. decreasesC. remains the sameD. None of these |
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Answer» Correct Answer - C Time period of oscillation of a pendulum is independent of small change in amplitude. |
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| 291. |
The matter or the substance through which sound is transmitted is called the ………………… A) object B) medium C) substance D) quantity |
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Answer» Correct option is B) medium |
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| 292. |
Wave that contains compression and rarefaction is called (A) Transverse wave (B) Longitudinal waves (C) Light rays (D) Ultraviolet ray |
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Answer» The answer is (B) Longitudinal waves |
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| 293. |
We have learnt that vibration is necessary for producing sound. Explain why the sound produced by every vibrating body cannot be heard by us? |
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Answer» If the sound produced by a vibrating body is in the audible range, the sound produced will be heard by us otherwise we will not be able to hear the sound even though the body is vibrating. |
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| 294. |
What name is given to the maximum displacement of a vibrating body from its central position? |
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Answer» Amplitude is called as the maximum displacement of a vibrating body from its central position. |
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| 295. |
A laboratory had the folowing apparatus available in it : (A) Two thin hollow wooden tubes (B) An intense and board source of sound ( C) An intense pointed source of sound (D) A sharp pointed detector to detect the sound ( E) A well polished metal sheet (F) A white painted thermocol sheet A student can do his experiment to verify the laws of reflection of sound successfully by choosing the appartus labelled as :A. A, C, D, EB. A, C, EC. A, B, D, ED. A, C and D |
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Answer» Correct Answer - A An intense pointed source and a sharp pointed detector should be perferred. For guiding the path of sound as incident and reflected sound waves, wooden tubes are required. A polished metal sheet acts as a good reflecter of sound. |
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| 296. |
Define the following 1. musical sound, 2. noise |
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Answer» (i) Musical sounds : “Sound waves which produce pleasant sensation in our ears and are acceptable, are called musical sounds.” (ii) Noise : “Sound waves which produce trouble-some sensation and are unacceptable are known as noise. |
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| 297. |
A tuning fork has a frequency of 212Hz. It will produce resonance in a wooden board of frequency (a) 106 Hz (b) 318 Hz (c) 212 Hz (d) 448 Hz |
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Answer» It will produce resonance in a wooden board of frequency 212 Hz. |
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| 298. |
A speed greater than that of any type of sound waves is said to be: (A) infrasonic speed (B) sonic speed (C) ultrasonic speed (D) supersonic speed |
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Answer» The answer is (D) supersonic speed |
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| 299. |
Infrasound can be heard by: (A) Elephant (B) bat (C) human beings (D) dog |
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Answer» The answer is (A) Elephant |
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| 300. |
Infrasound can be heard by :A. dogB. batC. rhinocerosD. human beings |
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Answer» Correct Answer - C Rhinoceroses (also whales and elephants) can produce and hear sound in the infrasonic range. |
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