E-PolyLearning

21. By e/m ratio of cathode rays, we deduce they are
a. protons
b. electrons
c. neutrons
d. anti neutron
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Answer: (b).electrons

22. Second orbit of hydrogen is far from first orbit at about
a. two times
b. six times
c. four times
d. nine times
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Answer: (c).four times

23. Thomson from his experiment on cathode rays concluded that every atom contains
a. protons
b. neutrons
c. electrons
d. anti neutrino
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Answer: (c).electrons

24. Another name for positive rays is
a. cathode rays
b. anode rays
c. canal rays
d. neutral rays
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Answer: (c).canal rays

25. Moseley performed his studies on X Rays in
a. 1980-1986
b. 1913-1915
c. 1920-1980
d. 1987-1989
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Answer: (b).1913-1915

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