Pharmaceutical Analysis Mcqs 11/01/202109/01/2021 by admin Please enter your email: 1. Tungsten lamp filament has required how much temperature ? A. 2000k B. 3000k C. 4000k D. 5000k2. 2.How much range wavelength is transmit by silicate glass ? A. 100 nm to 200 nm B. 200nm to 300 nm C. 300 nm to 350 nm D. 10nm to 40 nm3. 3. what is role of slit in uv-visible spectroscopy ? A. Monochromatic radiation to polychromatic radiation. B. Polychromatic radiation to monochromatic radiation. C. A and B D. None of this4. 4. Which radiation source has electrode in its construction ? A. Tungsten lamp B. Hydrogen discharge lamp C. Xenon Discharge Lamp D. Mercury lamp5. 5. Which device is used to isolate the radiation of the desired wavelength from wavelength of the continuous spectra ? A. Monochromator B. Radiation source C. Recorder D. None of this6. 6. Diffraction grating is consists of a A. Glass B. Quartz C. Alkyl halide D. All of the above7. 7. The work of Entrance slit is? A. To get narrow source B. To render light parallel C. To disperse radiation D. To fall on sample cell8. 8. Collimator is used for? A. To reform the image of the entrance slit. B. To get narrow source C. To fall on sample cell D. To disperse radiation9. 9. Exit slit used for A. To reform the image of the entrance slit. B. To get narrow source C. To fall on sample cell D. To disperse radiation10. 10. Which type of vapour is stored in Mercury lamp ? A. Mercury vapour B. Hydrogen vapour C. Xe D. Ozone11. Select the wavelength range corresponding to UV-visible region. (A) 400-800 nm (B) 200-800 nm (C) 25 μm-2.5 μm (D) 2.5 μm – 1mm12. The types of transitions possible in UV-visible region for a compound with molecular formula C 2H 4O are (A) P,Q,R (B) Q,R (C) P,S (D) P,Q,R,S13. If the above compound was completely reduced, what will be the possible transitions it can undergo? (A) n→p* (B) s→s* (C) p→p* (D) n→s*, s→s*14. At alkaline pH, phenol loses one proton and exists as phenoxide anion as shown below. Select the correct statement regarding their absorption. (A) Phenol shows more absorption than phenoxide anion (B) Phenoxide anion shows more absorption than phenol (C) Phenol has equal absorption as phenoxide anion (D) Phenol shows absorption but phenoxide anion doesn’t15. The λmax in α,β-unsaturated acids can be determined by (A) Wood ward fieser (B) Nielsen rules (C) Fieser-kuhn rules (D) All of the above16. Which of the following spectroscopy techniques is associated with molecular emission? (A) UV-Visible spectroscopy (B) IR spectroscopy (C) Fluorescence spectroscopy (D) X-ray diffraction17. The primary band in aromatic compounds are observed at (A) 241 (B) 215 (C) 255 (D) 18418. Beer Lambert’s law gives the relation between which of the following? a) Reflected radiation and concentration b) Scattered radiation and concentration c) Energy absorption and concentration d) Energy absorption and reflected radiationExplanation: Beer Lambert’s law gives the relation between Energy absorption and Concentration. It was proposed by Beer and Lambert.19. In which of the following ways, absorption is related to transmittance? a) Absorption is the logarithm of transmittance b) Absorption is the reciprocal of transmittance c) Absorption is the negative logarithm of transmittance d) Absorption is a multiple of transmittanceExplanation: Transmittance is the ratio of the radiant power transmitted by a sample to the radiant power incident on the sample. Absorption is the negative logarithm of transmittance.20. Which of the following is not a limitation of Beer Lambert’s law, which gives the relation between absorption, thickness, and concentration? a) Concentration must be lower b) Radiation must have higher bandwidth c) Radiation source must be monochromatic d) Does not consider factors other than thickness and concentration that affect absorbanceExplanation: The law is derived assuming that the radiation is monochromatic. So, if bandwidth increases it will create deviation.21. Beer’s law states that the intensity of light decreases with respect to ___________ a) Concentration b) Distance c) Composition d) VolumeExplanation: Beer’s law states that the intensity of light decreases with the concentration of the medium. It was stated by Beer.22. Lambert’s law states that the intensity of light decreases with respect to __________ a) Concentration b) Distance c) Composition d) VolumeExplanation: Lambert’s law states that the intensity of light decreases with respect to the concentration of the medium. It was stated by Lambert. Loading … Join in our Telegram Group for updates Related
