RRB NTPC GS Sound Mock Test Daily Tests General Awareness General Science Group D NTPC RRB November 16, 2020November 15, 2020TestsKindly Enter your Name and Email Address then Press Next to Start your Test. Name Email Address 1. In the microphone, used in the public address systemDeselect AnswerElectric signals are first converted into sound wavesSound waves are directly transmittedSound waves are converted into electric signals which are amplified and transmittedAmplification is not required2. When we hear a sound, we can identify its source fromDeselect AnswerAmplitude of soundIntensity of soundWavelength of soundOvertones present in the sound3. In an orchestra, the musical sounds of different instruments are distinguished from one another by which of the following characteristicsDeselect AnswerPitchLoudnessQualityOvertones4. A big explosion on the Moon cannot be heard on the Earth becauseDeselect AnswerThe explosion produces high frequency sound wave which are inaudiableSound waves require a material medium for propagationSound waves are absorbed in the atmosphere of moonSound waves are absorbed in Earth’s atmosphere5. Sitar maestro Ravi Shankar is playing sitar on its strings, and you, as a physicist (unfortunately without musical ears), observed the following oddities. I.The greater the length of a vibrating string, the smaller its frequency.II.The greater the tension in the string, the greater is the frequencyIII. The heavier the mass of the string, the smaller the frequency.IV . The thinner the wire, the higher its frequency. The maestro signalled the following combination as correct one : Deselect AnswerII, III and IVI, II and IVI, II and IIII, II, III and IV6. The material used for making the seats in an auditorium has sound absorbing properties. Why?Deselect AnswerIt reduces reverberationsIt makes the quality of sound betterIt makes the sound travel fasterAll of the above7. An empty vessel produces louder sound than a filled one becauseDeselect AnswerThe liquid in the filled vessel absorbs the vibrations of the liquid moleculesThe air molecules in empty vessel have greater amplitude and hence greater intensity than liquid molecules in the filled vesselThe density of air is less than the density of liquid contained in the vessel when filledThe kinetic energy of particles constituting the air column is greater as compared to the kinetic energy of particles of liquid column8. In the musical octave ‘ Sa’, ‘Re’, ‘Ga’Deselect AnswerThe frequency of the note ‘Sa’ is greater than that of ‘Re’, ‘Ga’The frequency of the note ‘Sa’ is smaller than that of ‘Re’, ‘Ga’The frequency of all the notes ‘Sa’, ‘Re’,’Ga’ is the sameThe frequency decreases in the sequence ‘Sa’, ‘Re’, ‘Ga’9. Velocity of sound is maximum inDeselect AnswerAirWaterVacuumSteel10. A stone is dropped in a well and splash is heard after 1.5 seconds after the stone hits the water surface. If the velocity of sound is 327 m/s, the depth of the well isDeselect Answer654.0 m490.5 m227 m981.0 m11. On which principle does sonometer worksDeselect AnswerHooke’s LawElasticityResonance12. Frequency range of the audible sounds isDeselect Answer0 Hz – 30 Hz20 Hz – 20 kHz20 kHz – 20,000 kHz20 kHz – 20 MHz13. During thunderstorm lightning is seen first and thunder is heard later on Why?Deselect AnswerFirst light and then sound is producedLight travels faster than soundSound travels faster than lightSound becomes feeble due to storm14. Echo is the effect produced due toDeselect AnswerReflection of soundDispersion of soundAbsorption of soundRefraction of sound15. A man sets his watch by a whistle that is 2 km away. How much will his watch be in error. (speed of sound in air 330 m/sec)Deselect Answer3 seconds fast3 seconds slow6 seconds fast6 seconds slow16 out of 15Click Submit Button to complete the Test.Join Our Telegram Channel for Latest Updates Click Here! Time is Up!RRB NTPC GS Sound Mock TestRRB NTPC & Group D General Science Free Mock TestsProperties of Matters, Heat,Cells, TissuesJoin Our Telegram Channel for Latest Updates Click Here!