Atoms And Radioactivity Question Preview (ID: 42251)


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Per year safe limit of radiation exposure is
a) 5 rem
b) 10 rem
c) 7 rem
d) 15 rem

Radiation that does not change it's direction inside magnetic field is
a) alpha particles
b) beta particles
c) gamma rays
d) x-ray

Greatest penetration power is of
a) gamma rays
b) alpha particles
c) beta particles
d) neutrons

Greatest power of ionization is in
a) alpha particles
b) gamma rays
c) both alpha and beta particles
d) beta particles

Radiations that can ionize matter are
a) alpha radiations
b) gamma radiations
c) beta radiations
d) all beta, alpha and gamma radiations

Nuclei which do not emit radiations naturally are called
a) unstable nuclei
b) stable nuclei
c) positive nuclei
d) negative nuclei

Artificially produced radioactive elements are known as
a) ions
b) radiants
c) radioisotopes
d) transmutations

Atoms of an element which have same number of protons but different number of neutrons in their nuclei are known as
a) ions
b) isotopes
c) radiants
d) electrons

Process of emission of natural radiation from some elements is called
a) radioactivity
b) degeneracy
c) transmutation
d) radiotransmutation

Time during which half of unstable radioactive nuclei disintegrate of sample of radioactive element is called the
a) full life
b) half life
c) double life
d) quarter life

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