Structure Of The Atom ( Part 1 )

Q.1: In 1886, E. Goldstein discovered the presence of new radiations in a gas discharge and called them ___________.

a) canal rays

b) electrons

c) atoms

Q.2: J. J. Thomson was awarded the Nobel Prize in Physics in 1906 for his discovery of ____________.

a) protons

b) electrons

c) neutrons

Q.3: ________’s atomic theory suggested that the atom was indivisible and indestructible.

a) Dalton

b) Thomson

c) Rutherford

Q.4: Thomson’s model of an atom proposed that ____________________.

a) Atom consists of a positively charged sphere and electrons are embedded in it.

b) Negative and positive charges are equal in magnitude, thus making atoms electrically neutral.

c) Both ‘a’ and ‘b’

Q.5: The mass of ________ is approximately 2000 times as that of the electron.

a) proton

b) neutron

c) none

Q.6: The charge of an electron is _________.

a) plus one

b) one

c) minus one

Q.7: ___________ are doubly…