_______________ 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

When 6d orbital is complete the entering electron goes into_________________?

A. 7f
B. 7s
C. 7p
D. 7d

Neutrons moving with an energy of 1.2 MeV are called_______________?

A. Fast neutrons
B. Slow neutrons
C. Moderate neutrons
D. All are possible

Which of the following way in used for classification of chromatography ?

A. Shape
B. Phase
C. Mechanism
D. All

Which of the following technique is used for the separation of insoluble particles from liquids ?

A. Filtration
B. Crystallization
C. Solvent extraction
D. Chromatography

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

The velocity of the photon____________________?

A. Is independent of wavelength
B. Depends upon source
C. Depends upon its frequency
D. Equals to the square of amplitude