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. |
The loudness and pitch of a sound note depends on __________ |
| A. | Intensity and frequency |
| B. | Frequency and number of harmonics |
| C. | Intensity and velocity |
| D. | Frequency and velocity |
| Answer» B. Frequency and number of harmonics | |
| 2. |
Speed of recession of a galaxy is proportional to its distance __________ |
| A. | Directly |
| B. | Inversely |
| C. | Exponentially |
| D. | Linearly |
| Answer» B. Inversely | |
| 3. |
The phenomenon by which stars recede from each other is explained by __________ |
| A. | Black hole theory |
| B. | Neutron star theory |
| C. | White dwarf |
| D. | Red shift |
| Answer» E. | |
| 4. |
Two trains, each moving with a velocity of 30m/s, cross each other. One of the trains gives a whistle whose frequency is 600Hz. If the speed of sound is 330m/s, the apparent frequency for passengers sitting in the other train before crossing would be __________ |
| A. | 600Hz |
| B. | 630Hz |
| C. | 930Hz |
| D. | 720Hz |
| Answer» E. | |
| 5. |
A racing car moving towards a cliff sound its horn. The driver observes that the sound reflected from the cliff has a pitch one octave higher than the actual sound of the horn. If v is the velocity of sound, the velocity of the car is? |
| A. | v/ 2 |
| B. | v/2 |
| C. | v/3 |
| D. | v/4 |
| Answer» D. v/4 | |
| 6. |
A car sounding its horn at 480Hz moves towards a high wall at a speed of 20m/s, the frequency of the reflected sound heard by the man sitting in the car will be nearest to __________ |
| A. | 480Hz |
| B. | 510Hz |
| C. | 540Hz |
| D. | 570Hz |
| Answer» D. 570Hz | |
| 7. |
The source of sound generating of a frequency of 3 kHz reaches an observer with a speed of 0.5 times the velocity of sound in air. The frequency heard by the observer is? |
| A. | 1 kHz |
| B. | 3 kHz |
| C. | 4 kHz |
| D. | 6 kHz |
| Answer» E. | |
| 8. |
A person is standing on a railway platform and a train is approaching to him, what is maximum wavelength of sound he can hear? Wavelength of whistle=1m, speed of sound in air=330m/s, speed of train=36km/h. |
| A. | 1m |
| B. | 32/322m |
| C. | 33/32m |
| D. | 12/13m |
| Answer» C. 33/32m | |
| 9. |
A train is approaching with velocity 25m/s towards a pedestrian standing on the track, frequency of horn of train is 1 kHz. Frequency heard by the pedestrian is (v=350m/s). |
| A. | 1077Hz |
| B. | 1167Hz |
| C. | 985Hz |
| D. | 945Hz |
| Answer» B. 1167Hz | |