MCQOPTIONS
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MCQOPTIONS
This section includes 14 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. |
At what condition, vp = vg? |
| A. | dvp/dk = 0 |
| B. | dvp/dω = 0 |
| C. | dvp/dλ = 0 |
| D. | dvp/dμ= 0 |
| Answer» D. dvp/dμ= 0 | |
| 2. |
Which of the following can be a wave function? |
| A. | tan x |
| B. | sin x |
| C. | cot x |
| D. | sec x |
| Answer» C. cot x | |
| 3. |
Energy of a wave divided by its momentum gives _____________ |
| A. | Group velocity |
| B. | Classical Velocity |
| C. | Phase Velocity |
| D. | Wave velocity |
| Answer» E. | |
| 4. |
The uncertainty in the location of a particle moving with velocity 7.28 X 107m /s is two times its de-Broglie wavelength. What is the uncertainty in measuring the velocity? |
| A. | 5.79 X 106 m/s |
| B. | 6.12 X 106 m/s |
| C. | 7.63 X 106 m/s |
| D. | 8.45 X 106 m/s |
| Answer» B. 6.12 X 106 m/s | |
| 5. |
The following is a possible wave function. |
| A. | True |
| B. | False |
| Answer» C. | |
| 6. |
Ψ must be normalizable. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 7. |
There is an inextensible string of linear density µ. If it is given that ω = \(k\sqrt{\frac{T}{μ}}\), then what is the group velocity of the string? |
| A. | \(\sqrt{\frac{T}{μ}}\) |
| B. | ħ\(\sqrt{\frac{T}{μ}}\) |
| C. | \(\frac{\hbar}{2}\sqrt{\frac{T}{μ}}\) |
| D. | \(\frac{1}{\hbar}\sqrt{\frac{T}{μ}}\) |
| Answer» B. ħ\(\sqrt{\frac{T}{μ}}\) | |
| 8. |
Which of the following is not a characteristic of wave function? |
| A. | Continuous |
| B. | Single valued |
| C. | Differentiable |
| D. | Physically Significant |
| Answer» E. | |
| 9. |
The motion of a wave packet is similar to _____________ |
| A. | Photons |
| B. | Waves |
| C. | Classical Particle |
| D. | Quantum Particle |
| Answer» D. Quantum Particle | |
| 10. |
Which of the following is the correct relation between the group velocity and the phase velocity? |
| A. | vg = vp + λdvp/dλ |
| B. | vp = vg + λdvp/dλ |
| C. | vp = vg – λdvp/dλ |
| D. | vg = vp – λdvp/dλ |
| Answer» E. | |
| 11. |
Which of the following is the correct expression for the group velocity? |
| A. | υλ |
| B. | dω/dυ |
| C. | dE/dk |
| D. | dE/ħdk |
| Answer» E. | |
| 12. |
Waves in the wave packets are such that they interfere constructively over a large region of space. |
| A. | True |
| B. | False |
| Answer» C. | |
| 13. |
The energy of elastic waves is given by _____________ |
| A. | nω |
| B. | n ħω |
| C. | nħω/2 |
| D. | (n + 1⁄2)ħω |
| Answer» E. | |
| 14. |
Elastic waves in crystals are made up of _______________ |
| A. | Photons |
| B. | Nano particles |
| C. | Atoms |
| D. | Phonons |
| Answer» E. | |