MCQOPTIONS
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MCQOPTIONS
This section includes 11 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. |
On which part of the photoelectric cell does the radiation strikes? |
| A. | Cathode |
| B. | Anode |
| C. | Ammeter |
| D. | Radiation does not strike on the photoelectric cell |
| Answer» B. Anode | |
| 2. |
Which of the following gases are filled inside the Photoelectric cells? |
| A. | Carbon Dioxide |
| B. | Nitrogen |
| C. | Neon |
| D. | Oxygen |
| Answer» D. Oxygen | |
| 3. |
What is the effect of intensity on the stopping potential? |
| A. | As intensity increases, stopping potential increases linearly |
| B. | As intensity increases, stopping potential decreases linearly |
| C. | As intensity decreases, stopping potential increases exponentially |
| D. | No effect |
| Answer» E. | |
| 4. |
The Kinetic energy of a photoelectron emitted on shining a light of wavelength 6.2 X 10-6 m on a metal surface of work function 0.1 eV is _________________ |
| A. | 0.01 eV |
| B. | 0.02 eV |
| C. | 0.1 eV |
| D. | 1 eV |
| Answer» D. 1 eV | |
| 5. |
Light of wavelength 3500 is incident on two metals A and B. Which metal will yield more photoelectrons if their work functions are 5 eV and 2 eV respectively? |
| A. | A |
| B. | B |
| C. | A & B |
| D. | C |
| Answer» C. A & B | |
| 6. |
The work function of lithium is 2.5 eV. The maximum wavelength of light that can cause the photoelectric effect in lithium is ______________ |
| A. | 3980 |
| B. | 4980 |
| C. | 5980 |
| D. | 6980 |
| Answer» C. 5980 | |
| 7. |
The photoelectric emission could be explained by the ____________ |
| A. | Wave nature of light |
| B. | Particle nature of light |
| C. | Dual nature of light |
| D. | Quantum nature |
| Answer» C. Dual nature of light | |
| 8. |
How does the intensity affect the photoelectric current? |
| A. | As intensity increases, the photoelectric effect increases |
| B. | As the intensity increases, the photoelectric effect decreases |
| C. | As the intensity decreases, the photoelectric effect becomes twice |
| D. | No effect |
| Answer» B. As the intensity increases, the photoelectric effect decreases | |
| 9. |
What is the time lag between the incidence of photons and the ejection of photoelectrons? |
| A. | Greater than 10<sup>-5</sup> s |
| B. | Between 10<sup>-5</sup> s and 10<sup>-9</sup> s |
| C. | Less than 10<sup>-9</sup> s |
| D. | 1 second |
| Answer» D. 1 second | |
| 10. |
What is the relation between the interaction parameter, b , and atomic radius, R, for the Photoelectric effect? |
| A. | b > R |
| B. | b R |
| C. | b < R |
| D. | no relation between b and R |
| Answer» B. b R | |
| 11. |
During Einstein s Photoelectric Experiment, what changes are observed when the frequency of the incident radiation is increased? |
| A. | The value of saturation current increases |
| B. | No effect |
| C. | The value of stopping potential increases |
| D. | The value of stopping potential decreases |
| Answer» D. The value of stopping potential decreases | |