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Online Tests
ECAT Pre General Science Physics Chapter 21 Nuclear Physics Online Test MCQs With Answers
Question # 1
The rate of decay of a radioactive substance
Choose an answer
decrease exponentially with time
decreases linearly with time
increases linearly with time
increases exponentially with time
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Question # 2
The chemical properties of all the isotopes of an elements are
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same
different
slightly different
none of these
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Question # 3
Binding energy per nucleus is
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greater for heavy nucleus
least for heavy nucleus
greatest for light nuclei
decreases for medium weight niclei
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Question # 4
Which of these is not a radiation detector
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Wilson cloud chamber
cyclotron acceleration
Geiger Miller counter
solid state detector
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Question # 5
When certain nucleus emits anα particle, its mass number:
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Increases by one
Decreases by one
Remain same
Decreases by four
None of these
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Question # 6
Radioactivity is
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self disruptive activity
spontaneous activity
exhibited by all elements under proper conditions
both 'a' and 'b'
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Question # 7
β-particles are easily deflected by collisions than heavy
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α-particles
β-particles
γ-particles
none of these
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Question # 8
Charge on proton is
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1.59 x 10
-9
C
1.59 x 10
-7
C
-1.59 x 10
-19
C
1.59 x 10
-19
C
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Question # 9
The half life of radioactive substances depends upon
Choose an answer
amount of substance
energy of substance
state of substance
temperature of substance
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Question # 10
Proton was discovered by Rutherford in
Choose an answer
1915
1906
1910
1920
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Question # 11
In his experiment on nuclear reactions, Rutherford bombardedα particles on:
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Nitrogen
Hydrogen
Lead
Oxygen
Krypton
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Question # 12
For an atom having atomic number Z and atomic weight A, the charge on the nucleus is
Choose an answer
A - Z
A + Z
Z
A
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Question # 13
γ-rays behave like a particle because they explain the
Choose an answer
Compton effect
Photoelectric effect
Pair-production
all the above
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Question # 14
Which of the following material has longer half life
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radium
polonium
radium
uranium
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Question # 15
Neon gas have three isotopes whose atomic numbers are
Choose an answer
20, 24 , 23
20, 21 , 22
20, 19 , 21
none of these
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Question # 16
There is present in paraffin a large amount of:
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Nitrogen
Hydrogen
Carbon
Baryllium
Lithium
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Question # 17
Phenomenon of radioactivity is due to disintegration of
Choose an answer
nucleus
neutron
proton
molecule
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Question # 18
The figure 1.007276μ shows the mass of an:
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Atom
Positron
Electron
Neutron
Proton
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Question # 19
The chemical properties of an element depends upon the number of
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electron
position
photons
neutrons
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Question # 20
Alfa particles are
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hydrogen nuclei
helium nuclei
electrons
photons
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Question # 21
Neutron was discovered in
Choose an answer
1915
1920
1925
1932
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Question # 22
Hydrogen atom with only one proton and one neutron in its nucleus, and one electron, is called
Choose an answer
deuterium
protium
tritium
none of these
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Question # 23
The unit of decay constant is
Choose an answer
sex
sec
2
sec
-1
sec
-2
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Question # 24
Fraction of the decaying atoms per unit time is called
Choose an answer
decay atom
decay element
decay constant
decay
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Question # 25
Beta particles are
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hydrogen nuclei
helium nuclei
electrons
photons
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Question # 26
The energy is found from Einstein's mass energy relation is called
Choose an answer
binding energy of electron
binding energy of proton
binding energy of neutron
binding energy of nucleus
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Question # 27
The range of particle depends upon the factor
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charge, mass and energy of particle
density of medium
ionization potential of the atoms
all the above
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Question # 28
The nucleus/nuclei of hydrogen is/are:
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Proton
Deuteron
Triton
All of these
None of these
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Question # 29
Structure of the nucleus was explained by
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J.J Thomson
Bohr
Millikan
Rutherford
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Question # 30
For Protium, the mass defect is:
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Infinite
Zero
Very large
A few grams
None of these
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Question # 31
Maric Curie and Pieree Curie discovered two new radioactive elements, which are called
Choose an answer
polonium uranium
uranium and radium
polonium and radium
none of these
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