E-PolyLearning

571. They produce flashes on ZnS plate
a. Neutron
b. Electron
c. Proton
d. All
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Answer: (c).Proton

572. The first theory of atom was proposed by
a. Bohr
b. Rutherford
c. Crook
d. Dalton
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Answer: (d).Dalton

573. The e/m values for the positive rays is highest for
a. Nitrogen
b. Hydrogen
c. Oxygen
d. Helium
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Answer: (b).Hydrogen

574. Electrons can revolve only in those orbits having fixed
a. Energy
b. Shape
c. Size
d. Angular Momentum
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Answer: (d).Angular Momentum

575. The velocity of photon is
a. Depends on its wavelength
b. Independent of its wavelength
c. Square of its wavelength
d. Source dependent
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Answer: (b).Independent of its wavelength