Electronic configuration of K is_________________?

A. [ar]4s2
B. [ar]4s1
C. [kr]5s1
D. [he]2s1

Milikan used ______________ in his atomizer?

A. Milk
B. Honey
C. Oil
D. Water

Spectrum is produced due to________________?

A. Different wavelength
B. Different colours
C. Different intensities
D. All have little contribution

Splitting of spectral lines when atom is subjected to magnetic field is called _______________?

A. Zeemans effect
B. Starks effect
C. Photo electric effect
D. Compton effect

Which one of the following explain the shape of orbitals _________________?

A. Principal of quantum number
B. Azimuthal quantum number
C. Magnetic quantum number
D. Spin quantum number

Pressure in gas discharge tube was kept________________?

A. 10 torr
B. 1 torr
C. 0.1 torr
D. 0.01 torr

Angle of deflection was studied by________________?

A. Hitorff
B. Stoney
C. William crookes
D. J.perrin

Positive rays give flash on________________?

A. Agno3 plate
B. Agcl plate
C. Zno
D. Zns

The value of e/m ratio of electron is________________?

A. 6.02 x 1023 c/kg
B. 1.7588 x 1020 c/kg
C. 9.1095 x 10-31 c/kg
D. 1.7588 x 1011 c/kg

Planks theory says energy is emitted__________________?

A. In continuous manner
B. Discontinuous manner
C. Simultaneously
D. In the form of heat