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Atoms Molecules Nuclei Electrons Photons Test Online

Test Name Atoms, Molecules, Nuclei, Electrons & Photons Test
Subject Physics
Test Type MCQs
Total Question 15
Total Marks 30
Total Time 15 Mints
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Atoms Molecules Nuclei Electrons Photons Test Online

Physics

1. The surface of zone material is radiated in turn by waves of λ = 350 nm and 540 nm respectively. The ratio of the stopping potential in the two cases is 2:1. The work function of the material is

 

Question 1 of 15

2. When radioactive substance emits an α-particle, then its position in the periodic table is lowered by:

 

Question 2 of 15

3. The flux of α-particle at angle 60° is

 

Question 3 of 15

4. In Bohr’s theory, relation between principal quantum number n and radius of orbit r is:

 

Question 4 of 15

5. Which one of the following has the highest neutrons ratio?

 

Question 5 of 15

6. The reaction responsible for the production of light energy from the sun will be:

 

Question 6 of 15

7. A proton is about 1840 times heavier than an electron. When it is accelerated by a potential difference of 1 kV, its kinetic energy will be

 

Question 7 of 15

8. The function of heavy water in a nuclear reactor to

 

Question 8 of 15

9. In ₈₈Ra²²⁶ nucleus there are:

 

Question 9 of 15

10. The radius of hydrogen atom in the first excited level is:

 

Question 10 of 15

11. X-ray will not show the phenomenon of

 

Question 11 of 15

12. The activity of a radioactive sample is 1.6 curie and its half life is 2.5 days. Then activity after 10 days will be:

 

Question 12 of 15

13. When cathode rays strike a metal target of high melting point with a very high velocity then which of the following are produced ?

 

Question 13 of 15

14. Half life of a substance is 20 minutes and then the time between 33% decay and 67 % decay will be

 

Question 14 of 15

15. A laser beam is used for carrying out surgery because it:

 

Question 15 of 15


 

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