Biophysics - Questions and Answers for Competitive Exams | GkSeries

25. The pH of a solution is determined by

• [A] concentration of salt
• [B] relative concentration of acids and bases
• [C] dielectric constant of the medium
• [D] environmental effect

Answer: Option [B]

26. Which of the following alcohols would be most soluble in water

• [A] methanol
• [B] ethanol
• [C] butanol
• [D] octanol

Answer: Option [A]

27. A biological polymer contains alanine, tyrosine, and lysine. Which of the following will be true about this molecule

• [A] DNA
• [B] Strong base
• [C] Phospholipid
• [D] Protein

Answer: Option [A]

28. The lone pair electrons on oxygen in a H20 molecule

• [A] carry a partial positive charge
• [B] are not important for the properties of water
• [C] carry a partial negative charge
• [D] form covalent bonds in ice

Answer: Option [C]

29. The strength of an acid depends on

• [A] number of neutrons gain
• [B] electronegativity
• [C] number of double bonds
• [D] number of protons released

Answer: Option [B]

30. The reason that fats contain more energy than simple sugars, is fats have many more

• [A] carbon atoms
• [B] hydrogen atoms
• [C] covalent bonds
• [D] hydrogen bonds

Answer: Option [C]

31. Which of the following will easily dissolve in a polar solvent

• [A] gasoline
• [B] methane
• [C] argon
• [D] sodium chloride

Answer: Option [D]

32. Which of the following is not used for detection in GC

• [A] Infrared spectroscopy
• [B] NMR
• [C] Flame ionisation
• [D] Electrical conductivity

Answer: Option [B]

33. The GC trace obtained after an experiment is called a

• [A] chromatograph
• [B] chromatogram
• [C] chromatophore
• [D] graph

Answer: Option [B]

34. What useful information can be found from a Van Deemter plot

• [A] The selectivity factor
• [B] Optimum mobile phase flow rate
• [C] Optimum column temperature
• [D] Optimum column length

Answer: Option [B]

35. Which of the following gases is unsuitable for use as a GC carrier gas

• [A] Nitrogen
• [B] Helium
• [C] Oxygen
• [D] Inert

Answer: Option [C]

36. What technique can be used to determine the murderer who left blood with the victim

• [A] DNA sequencing
• [B] PCR amplification
• [C] Western blot
• [D] RFLP mapping

Answer: Option [B]