1 eV is equal to
1.1.602 ? 1017 J
2.1.602 ? 10-19 J
3.1.602 ? 10-34 J
4.1.602 ? 10-27 J
A device used for the determination of atomic masses is called
1.Spectrometer
2.Bragg spectrometer
3.Mass spectrometer
4.Geiger � Muller counte
A large amount of energy is libereated in
1.fusion of heavy nuclei and fission of light nuclei
2.fusion of heavy or light nuclei
3.fission of light or heavy nuclei
4.fusion of light nuclei and fission of heavy nuclei
A positive ion of charge q is moving with a velocity v in magnetic field of induction B acting at right angles to the direction of motion of the ion. The force exerted by the field on the ion is
1.Bq/v
2.B/vq
3.Bqv
4.vq/B
An electron volt is the unit of
1.charge
2.potential difference
3.current
4.energy
BE/A curve shows that iron nucleus is
1.most stable
2.unstable
3.radio active
4.heavy
Binding energy of helium is
1.less than that hydrogen
2.less than that of lithium
3.more than that of lithium
4.equal to that of hydrogen
Energy equivalance of 1 amu is
1.913 Mev
2.931 Mev
3.981 Mev
4.918 Mev
Energy equivalent of mass defect is known as
1.energy equivalent of 1 amu
2.energy of the nucleus
3.binding energy
4.atomic energy
For nuclei having mass numbers between 40 and 120 the average binding energy is
1.8.8 MeV
2.8.5 MeV
3.7.8 MeV
4.7.6 MeV
If the B.E per nucleon of an element having atomic number 83 is 7.6 MeV then the element is
1.stable
2.non-radioactive
3.radioactive and unstable
4.the most stable one
If the mass defect for 2He4 nucleus is 0.03 amu its B.E per nucleon is
1.6.98 MeV
2.7.5 MeV
3.27.93 MeV
4.18.96 MeV
In Bain bridge mass spectrometer the radius of the curved path of an ion
1.depends only on the charge of the ion
2.is inversely proportional to the specific charge of the ion
3.depends only on the mass of the ion
4.depends only on the applied magnetic field
In velocity selector
1.only electric field is applied
2.only magnetic field is applied
3.Both electric and magnetic fields are applied in a parallel direction
4.both electric and magnetic fields are applied in a perpendicular direction
The BE/A value reaches a maximum of
1.8.5 MeV
2.8.8 MeV
3.8.9 MeV
4.9.8 MeV
The binding energy of 8O16 is 127.63 MeV. The average binding energy per nucleon is
1.7.977 MeV
2.15.95 MeV
3.79.77 MeV
4.7.977 eV
The energy required to liberate each nucleon will be maximum for
1.light nuclei
2.heavy nuclei
3.intermediate nuclei
4.both light and heavy nuclei
The masses of proton and neutron are 1.007277 amu and 1.008665 amu respectively. If the mass of 1H2 = 2.01473 amu then its binding energy per nucleon is
1.0.564 MeV
2.0.664 MeV
3.1.128 MeV
4.1.692 MeV
The maximum value of the binding energy per nucleon of the atom and the corresponding mass number are
1.8.5 MeV around A = 20
2.8.8 MeV around A = 50
3.8.5 MeV around A = 50
4.8.8 MeV around A = 20
the velocity selector in the Bainbridge mass spectrometer selects a particular velocity for the positive ray beam by
1.an electric field only
2.an magnetic field only
3.simultaneous electric and magnetic fields acting perpendicular to the ion beam
4.electric and magnetic fields acting parallel to the ion beam
Which of the following are correct (a) BE = (Zmp + (A - Z)mn + Zme - M) ? 931 MeV (b) BE = (Zmp + Amn + Zme - M) ? 931 MeV (c) BE = (Zmp + Nmn + Zme - M) ? 931 MeV (d) BE = (Zmp + Nmn + Zme - M) ? 931 MeV
1.(a) and (b)
2.(b) and c
3.(a) and c
4.(b) and (d)
Which one of the following quantities related to a nucleus does not charge as the mass number A increases
1.mass
2.volume
3.density
4.binding energy