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. |
It takes 2 seconds for a second wave to travel between two fixed points when the day temperature is 10 C. If the temperature rises to 30 C, the sound wave travels between the same fixed parts in __________ |
| A. | 1.9 sec |
| B. | 2 sec |
| C. | 2.1 sec |
| D. | 2.2 sec |
| Answer» B. 2 sec | |
| 2. |
A sound absorber attenuates the sound level by 20dB. The intensity decreases by a factor of ____________ |
| A. | 100 |
| B. | 1000 |
| C. | 10000 |
| D. | 10 |
| Answer» B. 1000 | |
| 3. |
A metal wire of linear mass density of 9.8/gm is stretched with a tension of 10kg wt between two rigid supports 1m apart. The wire passes at its middle point between the poles of a permanent magnet and it vibrates in resonance, when carrying an alternating current of frequency v. The frequency v of the alternating source is? |
| A. | 50 Hz |
| B. | 100 Hz |
| C. | 200 Hz |
| D. | 25 Hz |
| Answer» B. 100 Hz | |
| 4. |
Length of a string tied to two rigid supports is 40cm. Maximum length (wavelength in cm) of a stationary wave produced on it is? |
| A. | 20 |
| B. | 80 |
| C. | 40 |
| D. | 120 |
| Answer» C. 40 | |
| 5. |
The speed of sound in oxygen (O2) at a certain temperature is 460m/s. The speed of sound in helium (He) at the same temperature will be (assume both gases to be ideal). |
| A. | 460m/s |
| B. | 500m/s |
| C. | 650m/s |
| D. | 1420m/s |
| Answer» E. | |
| 6. |
A wave y=asin( t-kx), on a string meets with another wave producing a node at x = 0. Then, the equation of the unknown wave is? |
| A. | y=asin u2061( t+kx) |
| B. | y=-asin u2061( t+kx) |
| C. | y=asin u2061( t-kx) |
| D. | y=-asin u2061( t-kx) |
| Answer» C. y=asin u2061( t-kx) | |
| 7. |
The displacement y of a wave travelling in the x direction is given by
|
| A. | nWhere x is expressed in meters and t is seconds. The speed of the wave motion (in m/s) is? |
| B. | 300 |
| C. | 600 |
| D. | 1200 |
| E. | 200 |
| Answer» B. 300 | |
| 8. |
The displacement y of a particle in a medium can be expressed as
|
| A. | nWhere t is in seconds and x in meter. The speed of the wave is? |
| B. | 2000m/s |
| C. | 5m/s |
| D. | 20m/s |
| E. | 5 m/s |
| Answer» C. 5m/s | |
| 9. |
The displacement of a particle varies according to the relation
|
| A. | nThe amplitude of the particle is? |
| B. | -4 |
| C. | 4 |
| D. | 4 2 |
| E. | 8 |
| Answer» D. 4 2 | |