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Which of the following statements concerning an electron is false?
A)
It is a particle
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B)
It has wave properties
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C)
Its path is bent by a magnet
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D)
It gives out energy while moving in orbitals
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When hydrogen nuclei trap neutron, they become
A)
Hydrogen atom
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B)
deuterium
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C)
Tritium atom
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D)
beta rays
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The British physicist who received the 1923 Nobel Prize in Physics for discovering the electron is
A)
John Dalton
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B)
James Chadwick
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C)
J. J. Thomson
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D)
E. Rutherford
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The atomic spectra of hydrogen was explained by
A)
Rutherford's model of the atom
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B)
Hand's rule of maximum multiplicity
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C)
Pauli's exclusion principle
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D)
Bohr's theory
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Radioactive isotope of hydrogen is
A)
Hydride ion
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B)
tritium
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C)
protium
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D)
deuterium
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Neutrons are obtained by
A)
Bombardment of radium with a-particles
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B)
Bombardment of beryllium with P-particles
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C)
Radioactive disintegration of uranium
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D)
None of the above
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Isobars are produced as a result of the emission of
A)
\[\alpha \]-Particles
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B)
\[\gamma \]-rays
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C)
X-rays
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D)
\[\beta \]-particles
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The de Broglie equation is
A)
\[h/mv=\lambda \]
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B)
\[hv={{E}_{2}}-{{E}_{1}}\]
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C)
\[n\,\lambda =2d\,\sin \theta \]
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D)
\[c=hv\]
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Properties of elements are determined by
A)
Atomic number
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B)
atomic weight
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C)
Neutrons
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D)
protons
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Bohr's theory of fixed orbits contradicts
A)
Coulomb's law
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B)
Planck's theory
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C)
de Broglie relation
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D)
uncertainty principle
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Which of the following has the same atomic number and atomic weight?
A)
Hydrogen
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B)
helium
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C)
Oxygen
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D)
nitrogen
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The nucleus of a hydrogen atom consists of
A)
One proton
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B)
One proton + two neutrons
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C)
One neutron only
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D)
One electron only
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The names of the scientists, Newland, Mendeleev and Meyer are associated with the development of
A)
Atomic structure
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B)
Metallurgy
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C)
Periodic table of elements
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D)
Discovery of elements
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The mass number of a nucleus is
A)
Always less than its atomic number
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B)
The sum of the number of protons and neutrons present in the nucleus
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C)
Always more than the atomic weight
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D)
A fraction
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The following are the half-lives of four radioactive isotopes. Which one of the following is the most dangerous to handle?
A)
3 billion years
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B)
100 years
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C)
0.01 minute
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D)
13 days
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Anode rays were discovered by
A)
Goldstein
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B)
J. Stenely
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C)
Rutherford
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D)
Thomson
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Neutron was discovered by
A)
Rutherford
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B)
Langnuin
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C)
Chadwick
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D)
Austin
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Which of the following is the correct sequence in terms of increasing mass?
A)
Proton, electron, alpha particle, hydrogen atom
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B)
Electron, proton, hydrogen atom, alpha particle
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C)
Hydrogen atom, proton, electron, alpha particle
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D)
Alpha particle, proton, hydrogen atom, electron
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Neutron are present in all atoms except
A)
He
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B)
C
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C)
H
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D)
N
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Which of the following statement is incorrect?
A)
Isobars possess same chemical properties
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B)
Isotopes occupy same position in Periodic table
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C)
Isotopes possess same atomic number
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D)
In isobars the total number of protons and neutrons in the nucleus is same
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