InterviewSolution
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InterviewSolution
This section includes InterviewSolutions, each offering curated multiple-choice questions to sharpen your knowledge and support exam preparation. Choose a topic below to get started.
| 51. |
When light of wavelength 400nm is incident on the cathode of photocell, the stopping potential recorded is 6V. If the wavelength of the incident light is to 600nm, calculate the new stopping potential. [Given `h=6.6xx10^(-34) Js, c=3xx10^(8)m//s , e=1.6xx10^(-19)C`]A. `1.03 V`B. `2.42 V`C. `4.97 V`D. `3.58 V` |
| Answer» Correct Answer - C | |
| 52. |
A surface irradiated with light `lamda=480 nm` gives out electrons with maximum velocity v `ms^(-1)`, the cut off wavelength being 600 nm. The same surface would release electrons with maximum velocity `2vms^(-1)` if it is irradiated by light of wavelength.A. 325 nmB. 360 nmC. 384 nmD. 300 nm |
| Answer» Correct Answer - D | |
| 53. |
The combination of the gates shown in the figure below produces A. OR gateB. AND gateC. NOR gateD. XOR gate |
| Answer» Correct Answer - B | |
| 54. |
A proton has kinetic energy E = 100 keV which is equal to that of a photon. The wavelength of photon is `lamda_(2)` and that of proton is `lamda_(1)`. The ratio of `lamda_(2)//lamda_(1)` is proportional toA. `E^(2)`B. `E^(1//2)`C. `E^(-1)`D. `E^(-1//2)` |
| Answer» Correct Answer - D | |
| 55. |
The frequency of 1st line Balmer series in `H_(2)` atom is `v_(0)`. The frequency of line emitted by single ionised He atom isA. `2v_(0)Hz`B. `4v_(0)Hz`C. `(v_(0)//2)Hz`D. `(v_(0)//4)Hz` |
| Answer» Correct Answer - B | |
| 56. |
How many alpha and beta particles are emitted when uranium `._(92)^(238)U` decays to lead `._(82)^(206)Pb` ?A. 12,6B. 10, 4C. 8, 6D. 8,8 |
| Answer» Correct Answer - C | |
| 57. |
When in hydrogen like ion, electron jumps from n = 3, to n = 1, the emitted photon has frequency `2.7 xx 10^(15)Hz`. When electron jumps from n = 4 to n = 1, the frequency isA. `1.6 xx 10^(15)Hz`B. `2.8 xx 10^(15)Hz`C. `6.4 xx 10^(15)Hz`D. `4.8 xx 10^(15)Hz` |
| Answer» Correct Answer - B | |
| 58. |
The first line of the lyman series in a hydrogen spectrum has a wavelength of 1210 Å. The corresponding line of a hydrogen like atom of `Z=11` is equal toA. 4000 Ã…B. 100 Ã…C. 40 Ã…D. 10 Ã… |
| Answer» Correct Answer - D | |
| 59. |
The phenomenon by which light travels in an optical fibres isA. total internal reflectionB. scatteringC. diffractionD. refraction |
| Answer» Correct Answer - A | |