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_______ is used as a moderator in nuclear reactor.

Borium
Graphite
Sodium
Simple water


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Radioactive elements emit positively charged particles called

Gamma ray
Cathode ray
Alpha ray
Beta ray


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Atoms are composed of

Electrons
Protons
Electrons and protons
Electrons and Nuclei


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Divison of Isotopes occur because of

Distillation
Crystallisation
Filtration
Sublimation


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Which radioactive pollutant, due to its occurrence in the building material, has recently drawn to public?

Radan
Leptons
Baryons
Thorium


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In decreasing order, the masses of the three elementary particles are

Baryons, Mesons, Leptons
Mesons,Leptons, Baryons
Leptons, Mesons, Baryons
Baryons, Leptons, Mesons


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Which isotope of uranium is capable of sustaining chain reaction

U-236
U-237
U-238
U-235


Uranium-235 is an isotope of uranium making up about 0.72% of natural uranium. Unlike the predominant isotope uranium-238, it is fissile, i.e., it can sustain a fission chain reaction. It is the only fissile isotope that is a primordial nuclide or found in significant quantity in nature.

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What is the reason behind the dark lines in the solar spectrum

Absorption of corresponding wavelengths by the inner layers of the sun
Absorption of corresponding wavelengths by the outer layers of the sun
Absence of corresponding wavelengths by the inner layers of the sun
Destructive interference between waves of certain definite wavelengths


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Who proved that ''No two electrons in an atom can have the same set of four quantum numbers''

Newton
Rutherford
Thomson
Pauli


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According to Avogadro''s Hypothesis, What is name of the smallest particle of an element or a compound, that can exist independently.

Molecule
Atom
Particle
Tissue


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