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 charged helium ions.
a) protons
b) molecules
c) alpha particles
Q.8: ___________ is known as the ‘Father of nuclear physics’.
a) E. Rutherford
b) J. J. Thomson
c) Neils Bohr
Q.9: E. Rutherford won the Nobel prize in chemistry in _______.
a) 1937
b) 1908
c) 1924
Q.10: The positively charged centre in an atom is known as ______________.
a) particle
b) neutron
c) electron
Q.11: ____________ has no charge and has mass nearly equal to that of a proton.
a) neutron
b) nucleus
c) none
Q.12: ______________ got a Nobel prize for his work on the structure of atom in 1922.
a) J. J. Thomson
b) Dalton
c) Neils Bohr
Q.13: According to Bohr’s model of atom, electrons revolving in __________ orbits do not radiate energy.
a) discrete
b) circular
c) elongated
Q.14: Neutrons are present in nucleus of all atoms except ___________.
a) oxygen
b) hydorgen
c) nitrogen
Q.15: The sum of masses of protons and neutrons present in the nucleus gives the mass of an ___________.
a) particle
b) electron
c) atom
Answers:
- a
- b
- a
- c
- a
- c
- c
- a
- b
- b
- a
- c
- b
- b
- c
What a lot we have still to learn.
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Yes we do π
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Glad to hear that ππ
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Reblogged this on Nelson MCBS // Love Alone.
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Thank you for re-blogging my post βΊοΈπ
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You are most Welcome…
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