1. Ka is acid dissociation constant of the conjugate acid of: a) CO2 b) NH3 c) NH4 d) None of these B 2. pH linked biosensors are applicable to any system in which: a) Change in pH during chemical reaction takes place b) No change in pH during chemical reaction takes place c) Chemical reaction do not affect Ph d) None of these a 3. The immobilized enzyme on the ph sensor will decompose the analyte to produce: a) Calcium ions b) Hydrogen ions c) Nitrogen ions d) None of these b 4. Penicillin converts into Penicilloate in the presence of the catalyst: a) B-Lectamose b) Glucose oxidose c) Urease d) None of these a 5. Glucose converts into Gluconic acid in the presence of catalyst: a) B-Lectamose b) Glucose oxidose c) Urease d) None of these b 6. Urea converts into Ammonium in the presence of catalyst: a) B-Lectamose b) Glucose oxidose c) Urease d) None of these c 7. Creatinine converts into creatine in the presence of catalyst: a) B-Lectamose b) Glucose oxidose c) Urease d) None of these d 8. In the presence of catalyst adenine deaminase, Adenosine converts into: a) Creatine b) Inosine c) Penicilloate d) Gluconic acid b 9. High level of oxalate in urine is an indicator of: a) Kidney stones b) Low blood sugar c) High blood pressure d) High blood sugar a 10. Which of the following metabolites can be detected using a CO2 sensor: a) Urea b) Oxalates c) Penicillin d) Phenylalanine a 11. Which of the following can be detected using a Ammonia sensor: a) Gluconic acid b) Oxalates c) Penicillin d) Phenylalanine d 12. Debye-Huckle theory is related to: a) Ion activity b) Lithography c) Ion transport kinetics d) None of these c 13. Part of the electrode double layer containing charges in increasing disordered manner in the outward direction into the solution is called: a) Helmholtz plane b) Diffused part c) Both a) and b) d) none of these b 14. In inner Helmholtz layer potential changes: a) Linearly with distance b) Exponentially with distance c) Logarithmically with distance d) None of these a 15. In outer diffused layer potential changes: a) Linearly with distance b) Exponentially with distance c) Logarithmically with distance d) None of these b 1. If selectivity coefficient for Hydroxide in the presence of F- ion electrode is 0.1, for a concentration of Hydroxide 10 times higher than fluoride would give a response: a) Three times that of fluoride alone b) Two times that of fluoride alone c) Ten times that of fluoride alone d) None of these B *For a calibrated ISE , the calibration slope was +29.6 mV/decade in a 0.01 M solution. In a 0.001 M calcium chloride solution, the cell potential was -20.1 Mv while the potential in a mixed solution containing 0.01 CaCl2 and 0.1 M NaCl was -19.8 Mv. 2. Ionic strength of pure solution will be: a) 0.001M b) 0.002 M c) 0.003M d) 0.004M C 3. Ionic strength of mixed solution will be: a) 0.100M b) 0.103M c) 0.106M d) 0.112M B 4. Ion activity of pure calcium ion will be: a) 0.0001M b) 0.0004M c) 0.0008 M d) 0.0009M C 5. Selectivity coefficient of Ca+2 ions in the presence of Na+ will be: a) 0.0805 b) 0.008 c) 0.103 d) 0.705 D .