31. Which is used to separate molecules on the basis of their sizes? A. Ion exchange chromatography B. Molecular exclusion chromatography C. Adsorption chromatography D. Thin layer chromatography Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option B No explanation is given for this question Let's Discuss on Board
32. The heat sensitive components of microbial medium are sterilized by A. Moist heat B. Dry heat C. Radiation D. Membrane filtration Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option D No explanation is given for this question Let's Discuss on Board
33. The instrument used for determination of transparency of water is A. Spectrophotometer B. Ekman dredge C. Conductivity bridge D. Secchi disc Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option C No explanation is given for this question Let's Discuss on Board
34. Remote sensing of ocean-atmospheric parameters carried out in the microwave channels is based on the phenomenon of A. Emission B. Reflection C. Scattering D. Diffraction Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option A No explanation is given for this question Let's Discuss on Board
35. If one wishes to measure total As, As+3 and As+5 in a sample the most suitable analytical tool is A. Atomic absorption spectrophotometer B. Ion chromatograph C. Scanning electron microscope D. Gas chromatograph Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option A No explanation is given for this question Let's Discuss on Board
36. Sodium and potassium in rock and soil materials are generally estimated by A. UV-Visible spectrophotometry B. Flame photometry C. HPLC D. Colorimetry Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option C No explanation is given for this question Let's Discuss on Board
37. Snow blindness is caused due to A. Ultra - violet radiations B. Excessive flux of visible radiations C. Infra - red radiations D. Microwave radiations Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option B No explanation is given for this question Let's Discuss on Board
38. Which of the following experimental methods is not used to determine three-dimensional structures of biological macromolecules? A. Nuclear magnetic resonance spectroscopy B. Fluorescence spectroscopy C. X-ray crystallography D. Cryo-electron microscopy Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option B No explanation is given for this question Let's Discuss on Board
39. Which of the following instrument cap map the concentration of SO2 over an area of land? A. LIDAR B. GC C. Spectrophaotometer D. Mass spectroscopy Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option A No explanation is given for this question Let's Discuss on Board
40. Which of the following treatment achieves sterilization? A. Autoclaving B. Boiling C. Freezing D. Pasteurization Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option A No explanation is given for this question Let's Discuss on Board
