Sound One Liner Questions & Answers
| Questions | Answers | |
| 1 | The sound will have the highest velocity in – | Steel |
| 2 | The velocity of sound in air is approximately – | 343 m/sec. |
| 3 | The velocity of sound is maximum in – | Metal |
| 4 | If Va, Vw, and Vs respectively are the speed of sound in air, water, and steel, then – | Va < Vw < Vs |
| 5 | In which medium the speed of sound is maximum at a temperature of around 20°C? | Iron |
| 6 | Sound waves – | Can travel both in solid and gaseous mediums. |
| 7 | Sound waves travel fastest in – | Solids |
| 8 | Sound waves do not travel in – | Vacuum |
| 9 | The walls of the hall, built for music concerts should – | Absorb sound |
| 10 | To hear a clear echo, the minimum distance between the reflecting surface and the observer should be – | 16.5 meter |
| 11 | How much should the minimum distance be between the source of sound and the reflecting surface, so that an echo can be heard clearly? | 17 metre |
| 12 | One important characteristic of sound is ‘Pitch’, which depends upon – | Frequency |
| 13 | Two astronauts cannot hear each other on the moon’s surface, because – | No atmosphere on the moon |
| 14 | An astronaut cannot hear his companion at the surface of the moon because – | There is no medium for sound propagation |
| 15 | Ultrasonics are sound waves of frequency – | Greater than 20,000 Hz |
| 16 | What is the audible range (hearing range) of humans? | 20 Hz – 20000 Hz |
| 17 | A biotechnique in which ultrasonic sound is used – | Sonography |
| 18 | Bats can fly during dark nights and also prey. This is because – |
They produce ultrasonic waves and are guided by them
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| 19 | In Stethoscope, the sound of the patient’s heartbeat reaches the doctor’s ears by – | Multiple reflections of sound |
| 20 | Decibel is used to measure – | Sound in the atmosphere |
| 21 | A noise level of 100 decibels would correspond to – | Noise from a machine shop |
| 22 | As per the WHO, the safe noise level for a city is – | 45 db |
| 23 | The tolerable limit of noise for human being is around – | 85 decibel |
| 24 | Sound above what level (in decibels) is considered hazardous noise pollution? | 80 db |
| 25 | The optimum sound level for human beings is – | 60 db |
| 26 | When a sound wave goes from one medium to another, the quantity that remains unchanged is – | Frequency |
| 27 | When the same tone is played on a sitar and a flute, the sound produced can be distinguished from each other because of the difference in – | Quality only |
| 28 | The basic units of sound are called – | Phonemes |
| 29 | When T.V. is switched on – | Audio and video both start simultaneously |
| 30 | In television broadcasts, the picture signals are transmitted by – | Amplitude modulation |
| 31 | The technique used to transmit audio signals in television broadcasts is – | Frequency modulation |