InterviewSolution
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InterviewSolution
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.
| 151. |
Sound velocity is maximum inA. `H_(2)`B. `N_(2)`C. HeD. `O_(2)` |
| Answer» Correct Answer - A | |
| 152. |
The type of waves that can be propagated through solid isA. TransverseB. LongitudinalC. Both (a) and (b)D. None of these |
| Answer» Correct Answer - C | |
| 153. |
What is the minimum distance of the obstacle from the source of sound for hearing distinct echo ?A. 28 mB. 18 mC. 19 mD. 16.5 m |
| Answer» Correct Answer - D | |
| 154. |
The frequency of the first harmonic of a string stretched between two points is 100 Hz . The frequency of the third overtone isA. `200 Hz`B. `300 Hz`C. `400 Hz`D. `600 Hz` |
| Answer» Correct Answer - C | |
| 155. |
A wave travelling along positive x -axis is given by `y = A sin (omega t- kx)`. If it is reflected from rigid boundary such that 80% amplitude is reflected, then equation of reflected wave isA. `y = A sin(omega t+kx)`B. `y = -0.8 A sin(omega t+kx)`C. `y = 0.8 A sin (omega t+kx)`D. `y = A sin (omega t+0.8 kx)` |
| Answer» Correct Answer - B | |
| 156. |
A closed organ pipe and an open organ pipe have their first overtones identical in frequency . Their lenghts are in the ratioA. `1 : 2`B. `2 : 3`C. `3 : 4`D. `4 : 5` |
| Answer» Correct Answer - C | |
| 157. |
The first overtone in a closed pipe has a frequencyA. Same as the fundamental frequency of an open tube of same lengthB. Twice the fundamental frequency of an open tube of same lengthC. Same as that of the first overtone of an open tube of same lengthD. None of the above |
| Answer» Correct Answer - D | |
| 158. |
An empty vessel is partially filled with water, then the frequency of vibration of air column in the vesselA. Remains sameB. DecreasesC. IncreasesD. First increases then decreases |
| Answer» Correct Answer - C | |
| 159. |
An air column in a pipe, which is closed at one end, will be in resonance with a vibrating body of frequency 166 Hz , if the length of the air column isA. 2.00 mB. 1.50 mC. 1.00 mD. 0.50 m |
| Answer» Correct Answer - D | |
| 160. |
If separation between screen and source is increased by 2% what would be the effect on the intensityA. Increases by 4%B. Increases by 2%C. Decreases by 2%D. Decreases by 4% |
| Answer» Correct Answer - D | |
| 161. |
The musical interval between two tones of frequencies `320 Hz` and `240 Hz` isA. 80B. `(4/3)`C. `560`D. `320xx240` |
| Answer» Correct Answer - B | |
| 162. |
The equation of a plane progressive wave is given by`y = 0.025 sin (100 t + 0.25 x)`.The frequency of this wave would beA. `(50)/(pi) Hz`B. `(100)/(pi) Hz`C. `100 Hz`D. `50 Hz` |
| Answer» Correct Answer - A | |
| 163. |
The equation of the propagating wave is `y=25 sin (20 t+5 x)`,where y is displacement. Which of the following statement is not trueA. The amplitude of the wave is 25 unitsB. The wave is propagating in positive x -directionC. The velocity of the wave is 4 unitsD. The maximum velocity of the particles is 500 units |
| Answer» Correct Answer - B | |
| 164. |
The intensity of sound from a radio at a distance of 2 metres from its speaker is `1xx0^(-2) mu W//m^(2)`. The intensity at a distance of 10 meters would beA. `0.2 xx10^(-2) mu W//m^(2)`B. `1xx10^(-2) mu W//m^(2)`C. `4xx10^(-4) mu W//m^(2)`D. `5xx10^(-2) mu W//m^(2)` |
| Answer» Correct Answer - C | |
| 165. |
If `T` is the reverberation time of an auditorium of volume `V` thenA. `T prop 1/V`B. `T prop 1/V^(2)`C. `T prop V^(2)`D. `T prop V` |
| Answer» Correct Answer - D | |
| 166. |
Two waves of frequencies 20 Hz and 30 Hz. Travels out from a common point. The phase difference between them after 0.6 sec isA. zeroB. `(pi)/(2)`C. `pi`D. `(3 pi)/(4)` |
| Answer» Correct Answer - A | |
| 167. |
The phase difference between two points separated by 0.8 m in a wave of frequency 120 Hz is `90^(@)` . Then the velocity of wave will beA. `182 m//s`B. `360 m//s`C. `710 m//s`D. `384 m//s` |
| Answer» Correct Answer - D | |
| 168. |
The phase difference between two points separated by 1m in a wave of frequency 120 Hz is `90^(@)` . The wave velocity isA. 180 m/sB. 240 m/sC. 480 m/sD. 720 m/s |
| Answer» Correct Answer - C | |
| 169. |
If the length of a speed oragn pipe is `1.5 m` and velocity of sound is 330 m/s , then the frequency for the second note isA. 220 HzB. 165 HzC. 110 HzD. 55 Hz |
| Answer» Correct Answer - B | |
| 170. |
A pipe 30 cm long is open at both ends. Which harmonic mode of the pipe is resonantly excited by a 1.1 kHz source ? (Take speed of sound in air `= 330 ms^(-1)`)A. FirstB. SecondC. ThirdD. Fourth |
| Answer» Correct Answer - A | |
| 171. |
A pipe open at both ends produces a note of frequency `f_(1)` . When the pipe is kept with `(4)/(3)th` of its length it water, it produced a note of frequency `f_(2)`. The ratio `(f_(1))/(f_(2))` isA. `(3)/(4)`B. `(4)/(3)`C. `(1)/(2)`D. 2 |
| Answer» Correct Answer - C | |
| 172. |
A sine wave has an amplitude A and wavelength `lambda`. Let V be the wave velocity and v be the maximum velocity of a particle in the medium. ThenA. V = v if `lambda = (3A)/(2pi)`B. `V= v` if `A = 2pi lambda`C. `V = v` if `A = (lambda)/(2pi)`D. V can not be equal to v |
| Answer» Correct Answer - C | |
| 173. |
If the velocity of sound in air is 350 m/s . Then the fundamental frequency of an open organ pipe of length 50 cm, will beA. 350 HzB. 175 HzC. 900 HzD. 750 Hz |
| Answer» Correct Answer - A | |
| 174. |
What is the effect of increase in temperature on the frequency of sound produced by an organ pipe?A. IncreasesB. DecreasesC. UnchangedD. Not definite |
| Answer» Correct Answer - A | |
| 175. |
The apparatus used to find the speed of sound in a gas isA. Melde’s apparatusB. Kundt’s tubeC. Quincke’s tubeD. None of these |
| Answer» Correct Answer - B | |
| 176. |
Standing stationary waves can be obtained in an air column even if the interfering waves areA. Of different pitchesB. Of different amplitudesC. Of different qualitiesD. Moving with different velocities |
| Answer» Correct Answer - B | |
| 177. |
A wave of frequency 500 Hz has velocity 360 m/sec. The distance between two nearest points `60^(@)` out of phase, isA. RefractionB. InterferenceC. DiffractionD. Polarisation |
| Answer» Correct Answer - D | |
| 178. |
Which of the following is not the transverse waveA. X-raysB. y-raysC. Visible light waveD. Sound wave in a gas |
| Answer» Correct Answer - D | |
| 179. |
A wave of frequency 500 Hz has velocity 360 m/sec. The distance between two nearest points `60^(@)` out of phase, isA. 0.6 cmB. 12 cmC. 60 cmD. 120 cm |
| Answer» Correct Answer - B | |
| 180. |
Assertion : The speed of soun in solids is maximum though density is large. Reason : The coefficient of elasticity of solid is large.A. If both assertion and reason are true and the reason is the correct explanation of the assertion.B. If both assertion and reason are true but re ason is not the correct explanation of the assertion.C. If assertion is true but reason is false.D. If the assertion and reason both are false |
| Answer» Correct Answer - A | |
| 181. |
An Indian submarine and an enemy submarine move towards each other during maneuvers in motionless water in the Indian ocean. The Indian submarine moves at 50 km/h , and the enemy submarine at 70 km/h . The Indian sub sends out a sonar signal (sound wave in water) at 1000 Hz . Sonar waves travel at 5500 km/h . What is the frequency detected by the Indian submarine A. `1.02 kHz`B. `2kHz`C. `2.5kHz`D. `4.7 kHz` |
| Answer» Correct Answer - A | |
| 182. |
A string of length L and mass M hangs freely from a fixed point. Then the velocity of transverse waves along the string at a distance x from the free end isA. `sqrt(gL)`B. `sqrt(gx)`C. gLD. gx |
| Answer» Correct Answer - B | |
| 183. |
Assertion: Transverse waves are not produced in liquids and gases. Reason: Light waves are transverse waves.A. If both assertion and reason are true and the reason is the correct explanation of the assertion.B. If both assertion and reason are true but re ason is not the correct explanation of the assertion.C. If assertion is true but reason is false.D. If the assertion and reason both are false |
| Answer» Correct Answer - B | |
| 184. |
Assertion : Two persons on the surface of moon cannot talk to each other. Reason : There is no atmosphere on moon.A. If both assertion and reason are true and the reason is the correct explanation of the assertion.B. If both assertion and reason are true but re ason is not the correct explanation of the assertion.C. If assertion is true but reason is false.D. If the assertion and reason both are false |
| Answer» Correct Answer - A | |
| 185. |
Assertion : The reverberation time dependent on the the shape of enclosure, position of source and observer. Reason : The unit of absorption coefficient in mks system is metric sabine.A. If both assertion and reason are true and the reason is the correct explanation of the assertion.B. If both assertion and reason are true but re ason is not the correct explanation of the assertion.C. If assertion is true but reason is false.D. If assertion is false but reason is true |
| Answer» Correct Answer - D | |
| 186. |
. Assertion: The velocity of sound increases with increases in humidity. Reason: Velocity of sound does not depend upon the medium.A. If both assertion and reason are true and the reason is the correct explanation of the assertion.B. If both assertion and reason are true but re ason is not the correct explanation of the assertion.C. If assertion is true but reason is false.D. If the assertion and reason both are false |
| Answer» Correct Answer - C | |
| 187. |
A device used for investigating the vibration of a fixed string or wire isA. SonometerB. barometerC. HydrometerD. None of these |
| Answer» Correct Answer - A | |
| 188. |
Two instruments having stretched strings are being played in unison . When the tension in one of the instruments is increases by ` 1% , 3` beats are produced in ` 2 s`. The initial frequency of vibration of each wire isA. `220s^(-1)`B. `320s^(-1)`C. `150 s^(-1)`D. `300 s^(-1)` |
| Answer» Correct Answer - D | |
| 189. |
The amplitude of two waves are in ratio 5 : 2. If all other conditions for the two waves are same, then what is the ratio of their energy densitiesA. `5 : 2`B. `10 : 4`C. `2.5 : 1`D. `25 : 4` |
| Answer» Correct Answer - D | |
| 190. |
The first overtone of a stretched string of given length is 320 Hz. The first harmonic isA. 320 HzB. 160 HzC. 480 HzD. 640 Hz |
| Answer» Correct Answer - B | |
| 191. |
A man x can hear only upto 10 kHz and another man y upto 20 kHz . A note of frequency 500 Hz is produced before them from a stretched string. ThenA. Both will hear sounds of same pitch but different qualityB. Both will hear sounds of different pitch but same qualityC. Both will hear sounds of different pitch and different qualityD. Both will hear sounds of same pitch and same quality |
| Answer» Correct Answer - D | |
| 192. |
A musical scale is constructed by providing intermediate frequencies between a note and its octave whichA. Form an arithmetic progressionB. Form a geometric progressionC. Bear a simple ratio with their neighboursD. Form a harmonic progression |
| Answer» Correct Answer - C | |
| 193. |
Quality of a musical note depends onA. Harmonics presentB. Amplitude of the waveC. Fundamental frequencyD. Velocity of sound in the medium |
| Answer» Correct Answer - A | |
| 194. |
If you set up the ninth harmonic on a string fixed at both ends, its frequency compared to the seventh harmonicA. HigherB. LowerC. EqualD. None of the above |
| Answer» Correct Answer - A | |
| 195. |
Two sound sources when sounded simultaneously produce four beats in `0.25` second. the difference in their frequencies must beA. 4B. 8C. 16D. 1 |
| Answer» Correct Answer - C | |
| 196. |
What is the phase difference between particles being on either side of a node?A. `0^(@)`B. `90^(@)`C. `180^(@)`D. `360^(@)` |
| Answer» Correct Answer - C | |
| 197. |
A travelling wave in a stretched string is described by the equation `y = A sin (kx - omegat)` the maximum particle velocity isA. `A omega`B. `omega k`C. `d omega //dk`D. `x//t` |
| Answer» Correct Answer - A | |
| 198. |
A stone is hung in air from a wire which is stretched over a sonometer. The bridges of the sonometer are L cm apart when the wire is in unison with a tuning fork of frequency N . When the stone is completely immersed in water, the length between the bridges is l cm for re-establishing unison, the specific gravity of the material of the stone isA. `(L^(2))/(L^(2)+l^(2))`B. `(L^(2)-l^(2))/(L^(2))`C. `(L^(2))/(L^(2)-l^(2))`D. `(L^(2)-l^(2))/(L^(2))` |
| Answer» Correct Answer - C | |
| 199. |
Assertion: The flash of lightening is sees before the sound of thunder is heard. Reason: Speed of sound is greater than speed of light.A. If both assertion and reason are true and the reason is the correct explanation of the assertion.B. If both assertion and reason are true but re ason is not the correct explanation of the assertion.C. If assertion is true but reason is false.D. If the assertion and reason both are false |
| Answer» Correct Answer - C | |
| 200. |
Stationary waves are setup in an air column. Velocity of sound in air is `330 ms^(-1)` and frequency is `165 Hz`. The distance between two successive nodes isA. `2m`B. `1m`C. `0.5m`D. `4m` |
| Answer» Correct Answer - B | |