Practice Pakistan's most useful MCQs for competitive exams

Splitting of spectral lines when atoms are subjected to strong electric filed is called_________________?

• (A)  Zeeman effect
• (B)  Stark effect
• (C)  Photoelectric effect
• (D)  Compton effect

Answer

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When electron jump into orbit 1 then series obtained is___________________?

• (A)  Lyman
• (B)  Paschen
• (C)  Pfund
• (D)  Brackett

Answer

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Spectrum is produced due to________________?

• (A)  Different wavelength
• (B)  Different colours
• (C)  Different intensities
• (D)  all have little contribution

Answer

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Wavelength of electron was verified by_________________?

• (A)  Moseley
• (B)  Davisson and Germer
• (C)  Einstein
• (D)  Roentgen

Answer

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Sommerfelds modification in Bohrs model is_______________?

• (A)  Orbit is cylindrical
• (B)  Orbit is elliptical
• (C)  Orbit is longitudinal
• (D)  Orbit is asymmetrical

Answer

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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

Answer

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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

Answer

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Rutherford bombarded _________________ particles in discovery of nucleus?

• (A)  Gamma-rays
• (B)  Alpha-rays
• (C)  Beta-rays
• (D)  X-rays

Answer

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Charge of electron was measured by__________________?

• (A)  J.J Thomson
• (B)  Millikan
• (C)  Rutherford
• (D)  Perrin

Answer

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Free neutron changes into proton with the emission of__________________?

• (A)  Neutrino
• (B)  Electron
• (C)  Both A & B
• (D)  Meson

Answer

Submitted By :Ali Uppal