471. Atom cannot be divided into simple units theorized by________________?
A. Rutherford
B. Dalton
C. Bohr
D. Schrodinger

472. The number of fundamental particles in an atom of the lightest isotope carbon are_______________?
A. 6
B. 12
C. 18
D. 20

473. Increase in atomic number is observed during_________________?
A. Alpha emission
B. Beta emission
C. Both A & B
D. Radioactivity

474. Free neutron changes into proton with the emission of__________________?
A. Neutrino
B. Electron
C. Both A & B
D. Meson

475. Charge of electron was measured by__________________?
A. J.J Thomson
B. Millikan
C. Rutherford
D. Perrin

476. Rutherford bombarded _________________ particles in discovery of nucleus?
A. Gamma-rays
B. Alpha-rays
C. Beta-rays
D. X-rays

477. The maximum number of orbitals present in a subshell that is represented by Azimuthal quantum number = 3 will be________________?
A. 1
B. 3
C. 5
D. 7

478. 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

479. Sommerfelds modification in Bohrs model is_______________?
A. Orbit is cylindrical
B. Orbit is elliptical
C. Orbit is longitudinal
D. Orbit is asymmetrical

480. Wavelength of electron was verified by_________________?
A. Moseley
B. Davisson and Germer
C. Einstein
D. Roentgen