E-PolyLearning

66. Atom is composed just of electrons and protons, this concept prevailed till
a. 1980
b. 1932
c. 1970
d. 1960
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Answer: (b).1932

67. Neutron was emitted by rearrangement of nuclei of beryllium and
a. alpha particles
b. beta particles
c. gamma particles
d. hexa particles
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Answer: (a).alpha particles

68. Smallest charge which was observed by Millikan was
a. x10-19
b. x10-19
c. x10-19
d. x10-19
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Answer: (d).x10-19

69. On platinum foil, when cathode rays strike foil produces
a. glow
b. movement
c. holes
d. rupturing
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Answer: (a).glow

70. Electron was name which was given by
a. Thomson
b. Stoney
c. Edward
d. Addison
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Answer: (b).Stoney