Free neutron changes into proton with the emission of__________________?
A. Neutrino
B. Electron
C. Both A & B
D. Meson
Chemistry MCQs
Charge of electron was measured by__________________?
A. J.J Thomson
B. Millikan
C. Rutherford
D. Perrin
Rutherford bombarded _________________ particles in discovery of nucleus?
A. Gamma-rays
B. Alpha-rays
C. Beta-rays
D. X-rays
Pfund series are produced in the spectrum of hydrogen atom__________________?
A. when electrons jump down to 2nd- orbit
B. when electrons jump down to 3rd- orbit
C. when electrons jump down to 4th- orbit
D. when electrons jump down to 5th- orbit
Sommerfelds modification in Bohrs model is_______________?
A. Orbit is cylindrical
B. Orbit is elliptical
C. Orbit is longitudinal
D. Orbit is asymmetrical
Wavelength of electron was verified by_________________?
A. Moseley
B. Davisson and Germer
C. Einstein
D. Roentgen
Quantum number which tells the energy of electron is________________?
A. n
B. 1
C. m
D. s
_______________ can expel proteons from paraffins ?
A. Electron
B. Positron
C. Neutron
D. None of above has such capability
Centrifugal forces are balanced in atom by__________________?
A. Attractive forces
B. Repulsive force
C. Electrons
D. Neutrons
