MCQOPTIONS
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MCQOPTIONS
This section includes 9 Mcqs, each offering curated multiple-choice questions to sharpen your Engineering Physics knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
A string of length 0.4m and mass 10(-2) kg is tightly clamped at its ends. The tension in the string is 1.6N. Identical wave pulses are produced at one end at equal intervals of time, t. The minimum value of t which allows constructive interference between successive pulses is? |
| A. | 0.05s |
| B. | 0.10s |
| C. | 0.20s |
| D. | 0.40s |
| Answer» C. 0.20s | |
| 2. |
An organ pipe P1 closed at one end of vibrating in its first harmonic and another pipe P2 open at both ends vibrating in its third harmonic are in resonance with a given tuning fork. The ratio of the length of P1 to that of P2 is? |
| A. | 8/3 |
| B. | 3/8 |
| C. | 1/6 |
| D. | 1/3 |
| Answer» D. 1/3 | |
| 3. |
A tube closed at one end and containing air produces, when excited, the fundamental note of frequency 512Hz. If the tube is open at both ends, the fundamental frequency that can be excited is (in Hz). |
| A. | 1024 |
| B. | 512 |
| C. | 256 |
| D. | 128 |
| Answer» B. 512 | |
| 4. |
The displacement of particles in a string stretched in the x-direction is represented by y. Among the following expressions for y, those describing wave motion are ____________ |
| A. | coskxsin t |
| B. | k<sup>2</sup> <sup>2</sup>- <sup>2</sup> t<sup>2</sup> |
| C. | cos<sup>2</sup> (kx+ t) |
| D. | cos<sup>2</sup> (k<sup>2</sup> x<sup>2</sup>- <sup>2</sup> t<sup>2</sup>) |
| Answer» B. k<sup>2</sup> <sup>2</sup>- <sup>2</sup> t<sup>2</sup> | |
| 5. |
A transverse wave is described by the equation
|
| A. | nThe maximum particles velocity is equal to four times the wave velocity if? |
| B. | = y<sub>0</sub>/4 |
| C. | = y<sub>0</sub>/2 |
| D. | = y<sub>0</sub> |
| E. | =2 y<sub>0</sub> |
| Answer» C. = y<sub>0</sub>/2 | |
| 6. |
A siren placed at a railway platform is emitting sound of frequency 5kHz. A passenger sitting in a moving train A records a frequency of 5.5 kHz while the train approaches the siren. During his return journey in a different train B he records a frequency of 6kHz while approaching the same siren. The ratio of the velocity of train B to that train A is? |
| A. | 242/252 |
| B. | 2 |
| C. | 5/6 |
| D. | 11/6 |
| Answer» C. 5/6 | |
| 7. |
A train moves towards a stationary observer with speed 34m/s. The train sounds a whistle and its frequency registered by the observer is f1. If the train s speed is reduced to 17m/s, the frequency registered is f2. If the speed of sound is 340m/s, then the ratio f1/f2 is? |
| A. | 18/19 |
| B. | 1/2 |
| C. | 2 |
| D. | 19/18 |
| Answer» E. | |
| 8. |
A whistle giving out 450Hz approaches a stationary observer at a speed of 33m/s. The frequency heard by the observer in Hz is (speed of sound = 330m/s). |
| A. | 409 |
| B. | 429 |
| C. | 517 |
| D. | 500 |
| Answer» E. | |
| 9. |
A vibrating string of length l under a tension T resonates with a mode corresponding to the first overtone (third harmonic) of an air column of length 75cm inside a tube closed at one end. The string also generates 4 beats per second when excited along with a tuning fork of frequency n. Now when the tension of the string is slightly increased the number of sound in sir to 340m/s, the frequency n of the tuning fork in Hz is? |
| A. | 344 |
| B. | 336 |
| C. | 117.3 |
| D. | 109.3 |
| Answer» B. 336 | |