NUCLEAR CHEMISTRY MCQs
This reaction is an example of 4120Ca → 4119K
- Electron capture
- Neutron emission
- Alpha decay
- Gamma emission
Electron capture
What is the missing product from the given reaction?
12153i → 12152Te + …..
- β+
- β-
- 10n
- 42He
β+
Nuclei above the belt of stability can lower their neutron-to-proton ratio by________.
- Electron capture
- Gamma emission
- Positron emission
- Beta emission
Beta emission
Which are fundamental particles of an atom?
- Positron
- Neutron
- Proton
- All of A, B, and C
Proton
The reaction shown below is responsible for creating 14C in the atmosphere. What is the bombarding particle? 147N + _______ → 146C + 11H
- Alpha particle
- Electron
- Positron
- Neutron
Neutron
This reaction is an example of which of the following?
21084Po → 20682Pb + …….
- Gamma emission
- Beta emission
- Alpha decay
- Positron
Alpha decay
All atoms of a given element have the same
- Atomic number
- Number of nucleons.
- Atomic mass.
- Mass number
Atomic number
Which one of the following processes results in an increase in the atomic number?
- Gamma emission
- β+ decay
- Alpha emission
- β- decay
β- decay
Which type of radioactive decay results in no change in mass number and atomic number for the starting nucleus?
- Gamma emission
- Beta decay
- Electron capture
- Alpha decay
Gamma emission
What happens to the mass number and the atomic number of an element when it emits gamma radiation?
- The mass number and atomic numbers remain unchanged.
- The mass number increases by four and the atomic number increases by two.
- The mass number remains unchanged while the atomic number increases by one.
- The mass number decreases by four and the atomic number decreases by two.
The mass number and atomic numbers remain unchanged
Which one of the following is not a fissile material?
- 23592U
- 23994Pu
- 23392 U
- 23892U
23892U
What happens to the mass number and the atomic number of an element when it undergoes B decay?
- Neither the mass number nor the atomic number change.
- The mass number decreases by 4 and the atomic number decreases by 2.
- The mass number increases by 2 and the atomic number increases by 1.
- The mass number does not change and the atomic number increases by 1.
The mass number does not change and the atomic number increases by 1
Of the following processes, which one changes the atomic number?
- Alpha emission
- Beta emission
- Electron capture
- All of A, B, and C processes
All of A, B, and C processes
18
Two isotonic nucleides X and Y have mass numbers 35 and 37 respectively, If the atomic number of X is 17, the atomic number of Y will be
- 19
- 17
- 18
- 15
19
A specific isotope has an atomic number of 18 and a mass number of 35. How many electrons are there in the neutral atom?
- 34
- 35
- 17
- 18
Atoms containing radioactive nuclei are called
- Radioisophores
- Nucleons
- Nuclides
- Radionuclides
Radionuclides
The total mass of protons and neutrons of 28. an isotope is not equal to the actual mass of nuclide. This is because of
- Binding energy
- Radioactivity
- Attraction between neutron and electron
- None of A, B, and C
Binding energy
When n/p ratio of a nuclide of an element is greater than n/p ratio of a stable nuclide of the element, it disintegrates emitting
- Beta-particle
- Alpha-particle
- Neutrons
- Gamma-rays
Beta-particle
A negative value for the packing fraction Shows that the nuclide is
- Radioactive
- Very unstable
- Stable.
- Fissile
Stable
One Curie (Ci) is equal to
- 3.7 × 106 dpm
- 3.7 x 1010 dpm
- 3.7 x 1010 dph
- 3.7 x 1010 dpe
3.7 x 1010 dpe
The nuclear decay follows which order
- 1st order
- 3rd order
- 2nd order
- Zero order
1st order
Nuclides with same atomic number and mass number but differing in nuclear properties are called
- Nuclear isomers
- Isotones
- Isobars
- Isotopes
Nuclear isomers
Radioactivity is a nuclear process. It remains unaffected by external factor(s) such as
- Temperature
- Pressure
- Catalyst
- All of A, B, and C
All of A, B, and C
Which radiation is emitted during nuclear decay?
- Alpha rays
- Beta rays
- Gamma rays
- All of A, B, and C
All of A, B, and C
Which particle is not accelerated in particle accelerators?
- Proton
- Neutron
- Electron
- All of A, B, and C
Neutron
Which is/are industrial applications of tracers?
- Measurement of bulk flow
- Mixing efficiency
- Leak measurement
- All of A, B, and C
All of A, B, and C
Which is a characteristic of unstable isotopes?
- High packing fraction
- High n/p ratio
- Lows binding energy
- None of A, B, and C
High n/p ratio
The process of splitting of a heavier nucleus into several fragments by bombarding with suitable high speed projectile is called
- Spallation reaction
- Nuclear fission
- Nuclear fusion
- Beta decay
Spallation reaction
Which device(s) is helpful and used as particle accelerator?
- Cyclotron
- Synchroton
- Linear accelerator
- All of A, B, and C
All of A, B, and C
Which technique is helpful and used to find the age of the old wooden objects or animal fossils?
- C-14 dating
- C-13 dating
- C-12 dating
- Beta decay
C 14 dating
The process of splitting of a heavier nucleus into smaller fragments by bombarding with suitable subatomic particle is called
- Nuclear fission
- Nuclear fusion
- Spallation reaction
- Beta decay
Nuclear fission
Atomic bomb is based on which nuclear process
- Nuclear fusion
- Beta decay
- Spallation reaction
- Nuclear fission
Nuclear fission
Which nuclide(s) is helpful and used as nuclear fuel?
- U-235
- U-233
- Pu-239
- All of A, B, and C
All of A, B, and C
What is the SI unit of activity?
- Curie
- Rad
- Becquerel
- None of A, B, and C
Becquerel
Controlled nuclear fission process is carried out in
- Neutron bomb
- Atomic bomb
- Hydrogen bomb
- Nuclear reactor
Nuclear reactor
The process in which lighter nuclides fuse together to form a heavy nuclide and more stable nuclides is called
- Spallation reaction
- Nuclear fission
- Nuclear fusion
- Beta decay
Nuclear fusion
Which substance is helpful and used as moderator to slow down the speed of neutron in reactor?
- Soft water
- Aluminum
- Diamond
- Heavy water
Heavy water
Which substance is helpful and used as control rods in nuclear reactor?
- Ca
- Al
- Graphite
- B
B
Which are medical applications of radioisotopes?
- Relief of Leukemia
- Relief of cancer
- Treatment of goiter
- All of A, B, and C
All of A, B, and C
Naturally occurring uranium contains only which % of U-235?
- 0.71%
- 0.3%
- 0.5%
- 0.1%
0.71%
A stable nuclide has in general
- Even no of protons and even no of neutrons
- Odd no of protons and odd no of neutrons
- Equal no of protons and neutrons
- Odd no of protons and even no of neutrons
Even no of protons and even no of neutrons
The instability of a nuclide is due to
- High electron proton ratio
- Low neutron electron ratio
- Low electron proton ratio
- High neutron proton ratio
High neutron proton ratio
Which particles are considered to be responsible for keeping nucleons together?
- Mesons
- Neutrons
- Positrons
- Protons
Mesons
Isotopes contain same number of
- Neutrons
- Electrons
- Positrons
- Protons
Protons
Al29 is expected to disintegrate by
- Alpha-emission
- Proton emission
- Positron emission
- Beta-emission
Beta-emission
Which device is helpful and used to accelerate the particles?
- Cyclotron
- Linear accelerator
- Synchroton
- All of A, B, and C
All of A, B, and C
Which reactions are common in sun and stars?
- Thermonuclear reactions
- Redox reactions
- Displacement reactions
- Fission reactions
Thermonuclear reactions
Which device is helpful and used to carry out controlled nuclear reaction?
- Nuclear reactor
- Neutron bomb
- Hydrogen bomb
- Atomic bomb
Nuclear reactor
Which is artificial series?
- The neptunium series
- The actinium series
- The thorium series
- The uranium series
The neptunium series
Which methods are/is helpful and used to detect radioactivity?
- Photography
- Gas ionization method
- Scintillation method
- All of A, B, and C
All of A, B, and C
1 amu is equal to
- 931.5 Mev
- 931.5 kev
- 93.15 Mev
- 931.5 ev
931.5 Mev
Decrease in atomic number is not observed during
- Alpha-emission
- Electron emission
- Positron emission
- Beta-emission
Beta-emission
The nuclear isomers vary in ______ .
- Number of neutrons
- Mass number
- Number of protons
- Half-life period
Half-life period
U238 is expected to disintegrate by alpha mission. The mass number and atomic number of the product is
- 236, 92
- 238, 962
- 240, 90
- 34, 80
234, 90
Which equation represents the relationship between half-life and decay constant?
- t1/2 = k
- t1/2 = 1/k
- t1/2 = 0.693/k
- t1/3 = 0.693 k
t1/2 = 0.693/k
The instability of a nucleus is attributed to
- High proton: electron ratio
- High proton: neutron ratio
- Low proton: electron ratio
- High neutron: electron ratio
High proton: neutron ratio
Mesons are responsible for
- Attraction between nucleus
- Attraction between nucleons.
- Disintegration of nucleus
- Repulsion between the proton in the nucleus
Attraction between nucleons
In balancing the nuclear reaction 23892U → 234xE + 42He, the value of x is __________
- 92
- 94
- 234/2
- 90
90
The protons and neutrons in the nucleus of an atom undergo inter conversion through the exchange of
- Positrons
- Neutral mesons
- Mucons
- Charged mesons
Charged mesons
The amount of energy needed to break the nucleus into its constituents is called
- Binding energy
- Thermal energy
- Kinetic energy
- Nuclear energy
Binding energy
Which is not a mode of self-dissociation of radioisotopes?
- Fission.
- Beta-emission
- Alpha-emission
- Electron capture
Fission
The activity of a radioactive isotope decreases with
- Pressure1
- Temperature
- Chemical environment
- None of A, B, and C
None of A, B, and C
The radiation having high penetration power is
- Gamma rays
- Beta- rays
- Cathode rays
- Alpha-rays
Alpha-rays
If a nuclide has large ratio of p/n, it will emit
- Neutrons
- Gamma particles
- Beta-particles
- Alpha-particles
Alpha-particles
The n/p of stable isotopes breaks off from the hypothetical 1:1 n/p plot at the atomic number
- 10
- 30
- 40
- 20
20
The hydrogen isotope tritium emits
- Gamma rays
- Neutron
- Alpha-particles
- Beta-particles
Beta-particles
Which has a negative charge?
- Positron
- Neutron
- Neutrino.
- Antiproton
Antiproton
Which isotopes is helpful and used in establishing the mechanism of photosynthesis in plants?
- C14
- C12
- C13
- H2
C14
____ is the branch of chemistry which deals with the study of changes within the nucleus.
- Nuclear chemistry
- Photochemistry
- Surface chemistry
- Polymer
Nuclear chemistry
Which isotopes is helpful and used in establishing the age of dead animals and plants?
- H2
- C12
- C14
- C18
C14
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