Dawn of Modern Physics Test Online Preparation Mcqs

Dawn of Modern Physics Test Online Preparation Mcqs With Answers Start Below

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Question 1 of 15

1. U.V radiations of 6.2eV falls on an aluminium surface, K.E of fastest electron emitted is (work function = 4.2eV)
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Question 2 of 15

2. For confinement of electron in a box of radius 10-14m, the electron speed should be ______.
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Question 2 of 15

Question 3 of 15

3. A photon of wavelength 900nm behaves like a particle of mass _______.
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Question 3 of 15

Question 4 of 15

4. According to special theory of relativity, time is not absolute quantity. This result applies to _______ timing processes.
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Question 4 of 15

Question 5 of 15

5. A device based on photoelectric effect is called ________.
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Question 5 of 15

Question 6 of 15

6. If n number of photon are striking on a metal surface, then total momentum exerted is _____.
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Question 6 of 15

Question 7 of 15

7. Stopping potential for a metal surface in case of photoelectric emission depends on __________.
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Question 7 of 15

Question 8 of 15

8. The ratio of e/m of a proton to that of an alpha particle is
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Question 8 of 15

Question 9 of 15

9. If a material object moves with speed of light, its mass becomes ______
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Question 9 of 15

Question 10 of 15

10. In electron microscope, we use energetic particles because of _______.
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Question 10 of 15

Question 11 of 15

11. An observer shoots parallel to a meter stick at very high (relativistic) speed and finds that the legth of meter stick is ________.
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Question 11 of 15

Question 12 of 15

12. Linear momentum of a  photon is ________
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Question 12 of 15

Question 13 of 15

13. If a diffraction grating is placed in the path of a light beam, it reveals ________.
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Question 13 of 15

Question 14 of 15

14. The resolution of 50 KV electron microscope is:
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Question 14 of 15

Question 15 of 15

15. In Compton scattering, the change in wave length is max. if _______.
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Question 15 of 15


 

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