(Solved):   Q17. For a polychromatic radiation deviation of Beers Law, analysis is performed at \( \la ...

 

Q17. For a polychromatic radiation deviation of Beers Law, analysis is performed at \( \lambda^{\prime} \) rather than \( \lambda \). Positive deviation is expected if: A) \( \varepsilon^{\prime}=\varepsilon \) B) \( \varepsilon^{\prime}<\varepsilon \) C) \( \varepsilon^{\prime}>\varepsilon \) Q18. Which of the following statements is not -correct about electromagnetic radiation: A) Its waves consist of magnetic field and electric field. B) Energy of photons increases by increasing wavelength. C) IR region is less energetic than UV region. D) UV region has shorter wavelengths than Visible. Q19. In ICP-MS, elements are determined according to their: A) Absorbing wavelength B) Emission wavelength D) Mass/charge ratio C) Mass Q20. The major interference in ICP-OES is: A) Chemical B) Spectral C) Mass D) Isobaric ions. Q21. The average temperature of plasma in ICP is in the range: A) \( 70000 \mathrm{~K} \) B) \( 3000 \mathrm{~K} \) C) \( 7000 \mathrm{~K} \) D) \( 500 \mathrm{~K} \) Q22. The hollow-cathode lamp is used as radiation source in: A) Spectrophotometer B) Fluorometer C) Atomic Absorption spectrometer D) Atomic Emission spectrometer. Q23. Cold-vapor hydride generation atomic absorption technique is employed of measurement of: A) As B) \( \mathrm{Se} \) C) \( \mathrm{Pb} \) D) \( \mathrm{Hg} \) Q24. The major function of nebulizer is: \( \begin{array}{ll}\text { A) To generate gaseous atoms } & \text { B) To convert aqueous solution to fine spray }\end{array} \) C) To align hollow-cathode lamp D) To convert aqueous solution to fine aerosol Q25. Which of the following statements is not correct? A) Electrothermal atomization is more sensitive than flame atomic absorption method. B) Electrothermal atomization takes longer time than flame atomic absorption. C) Electrothermal atomization is less reproducible than atomic absoeption. D) Electrothermal atomization has lower linear dynamic range than ICP-OES. Q26. Large portion of Argon is consumed in ICP source in: A) introducing the sample B) cooling the torch C) generating the plasma D) Argon is distributed equally.