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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


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


Question 1 of 15

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


Question 2 of 15

3. 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 3 of 15

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


Question 4 of 15

5. A radioactive substance decays to 1/16th of its initial activity in 40 days. The half-life of the radioactive substance expressed in days is


Question 5 of 15

6. In the nuclear reaction, there is a conservation of:


Question 6 of 15

7. X-ray will not show the phenomenon of


Question 7 of 15

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


Question 8 of 15

9. 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 9 of 15

10. The kinetic energy of an electron, which is accelerated in the potential difference of 100 V, is:


Question 10 of 15

11. If the electron in hydrogen orbit jumps from third orbit to second orbit, the wavelength of the emitted radiation is given by:


Question 11 of 15

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


Question 12 of 15

13. Particle nature and wave nature of electromagnetic waves and electrons can be represented by:


Question 13 of 15

14. The speed of an electron having a wavelength of 10⁻¹⁰ m is:


Question 14 of 15

15. For an electron in the second orbit of hydrogen the moment of momentum as per Bohr’s model is


Question 15 of 15


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