X-Ray Spectrometers Multiple Choice Questions and Answers 1. The crystal used as X-ray grating has _______ dimensional lattice arrays. a) One b) Two c) Three d) Four Answer: Three. 2. X-ray diffractometers provide ____________ information about the compounds present in a solid sample. a) Quantitative b) Qualitative c) Quantitative and qualitative d) Either quantitative or qualitative Answer: Quantitative and qualitative 3. X-ray emission must be analysed against a background of _______ radiation. a) Blue b) Yellow c) White d) Green Answer: White. 4. In Diffractometer, the identification of a component of the sample from its powder diffraction pattern is based upon the _________ of lines and their relative ___________ a) Number, length b) Number, intensity c) Position, length d) Position, intensity Answer: Position, intensity. 5. In Diffractometers, line intensities depend on ______ and kind of atomic reflection centres in each set of plates. a) Number b) Position c) Length d) Distance ...

Radiochemical Techniques Multiple Choice Questions and Answers 1. The difference between the pulses having amplitudes between the two triggering levels is called __________ a) Pulse width b) Energy gap c) Window width d) Amplitude variation Answer: Window width. 2. A quench curve can be constructed by plotting the counting efficiency versus ____________ a) Q-number b) Quench factor c) H-number d) Disintegrations Answer: H-number. 3. The reduction in counting efficiency of the scintillation detector is called as __________ a) Disintegration b) Decay c) Quenching d) Reduction Answer: Quenching. 4. In liquid scintillation counter, which of the following is a fluorescent substance? a) Solvent b) Solute c) Crystal d) Reagent Answer: Solute. 5. Due to the presence of red, green and yellow colour in the vial, which of the following occurs? a) Chemical quench b) Interference quench c) Colour quenching d) Self-absorption Answer: Colour quenching. 6. When UV light is absorbed by the fluor molecu...

Dissolved Component Analysers Multiple Choice Questions and Answers 1. If the differential amplifier gives a positive output then it infers which of the following (Reference output is given to the positive terminal and sample output is given to the negative terminal)? a) The concentration of silica in sample and reference solution is equal b) The concentration of silica in a reference solution is more than that in the sample solution c) The concentration of silica in sample solution is more than that in the reference solution d) Further processing is required to come to any conclusion Answer: The concentration of silica in sample solution is more than that in the reference solution. 2. Which of the following are used to free bound ions or liberate bound ions? a) Colouring agents b) Ammonia Buffer c) Reagents d) Iodine solution Answer: Reagents. 3. Which of the following are added for pH adjustment in sodium analyser? a) Acidic solution b) Basic solution c) Hydrazine d) Ammonia buffer A...

Ion Analysers Multiple Choice Questions And Answers 1. The dilution of solution must not reduce the level of ammonia below _________ a) 10-2 M b) 10-5 M c) 10-8 M d) 10-9 M Answer: 10-5 M. 2. When electrode potential response is plotted as a function of ammonia concentration on a semi-log graph, the graph obtained will be ____________ a) A straight line b) Parabolic c) Sigmoidal d) A curve Answer: A straight line. 3. If a solid or liquid membrane is placed in pure water, the membrane dissolves slightly, producing an equilibrium concentration of the measured ion. This is represented as __________ a) A constant, Eo b) Activity c) Blank correction, Cb d) Concentration of standard solution, Cs Answer: Blank correction, Cb. 4. In liquid membrane electrode, the liquid ion exchanger is held in a porous disc of _____________ a) Solid material b) Semi-permeable membrane c) Hydrophobic material d) Water absorbing material Answer: Hydrophobic material. 5. Ion selective electrodes have ________ li...

PH Meters Multiple Choice Questions and Answers 1. In Hydrogen electrode, the electrode is placed in a solution of ____ M Hcl. Fill in the blank. a) 0.5 b) 1 c) 2 d) 3 Answer: 1. 2. Which of the following is the value of hydrogen ion concentration of pure water? a) 1×10^7 moles/litre b) 1×10^5 moles/litre c) 1×10^6 moles/litre d) 1×10^8 moles/litre Answer: 1×10^7 moles/litre. 3. Which of the following is the relation between hydrogen and hydroxyl ion concentration of pure water? a) Value of hydrogen ion concentration is greater b) Value of hydroxyl ion concentration is greater c) They are both always the same d) The concentrations keep changing Answer: They are both always the same. 4. Which of the following is not a failure in pH meters? a) Defective electrodes b) Defective input circuitry c) Defective electronic circuitry d) Defective calibration Answer: Defective calibration. 5. The electrodes used in pH measurement have which of the following internal resistances? a) Very low resis...

Pollution Monitoring Instruments Multiple Choice Questions and Answers 1. Non-dispersive infrared analyzer depends on the characteristic absorption of the CO molecule at a wavelength of __________ a) 5.4 µm b) 4.6 µm c) 8.9 µm d) 10.8 µm Answer: 4.6 µm. 2. In the conductivitimetric method, to measure the conductivity of the cell, 5V ___________ is applied across the electrodes. a) DC b) AC c) Pulsating DC d) DC or AC Answer: AC. 3. Sensitivity to total sulphur by Flame-photometric detector is which of the following levels? a) 0.1 ppm b) 1 ppm c) 2 ppm d) 0.01 ppm Answer: 0.01 ppm. 4. In West-Gaeke colourimetric procedure, the intensity of the red purple colour is measured photometically and it is proportional to the concentration of sulphur dioxide. What is the red purple coloured compound? a) Sodium tetra chloromercurate b) Dicholorosulphitomercurate complex c) Ammonia molybdate d) Paraosaniline sulphonic acid Answer: Paraosaniline sulphonic acid. 5. Which of the following are not the...

Industrial Gas Analysers Multiple Choice Questions and Answers 1. In polarographic cell when potential is applied, oxygen is reduced at __________ when KCl is present. a) Anode b) Cathode c) Electrolyte d) Both the electrode Answer: Cathode. 2. A pink coloured dye complex is formed when air containing NO2 is passed in an absorbing solution consisting of __________ and diamine dissolved in the acetic acid medium. a) Sulphuric acid b) Sulphonyl c) Sulphonic acid d) Sulphanilic acid Answer: Sulphanilic acid. 3. Which of the following is true about the two charged vanes that produce electric field in Paramagnetic oxygen analyzer? a) Both the vanes should be at higher potential than the test body b) Both the vanes should have the same potential as the test body c) One vane should be at higher potential than the test body and the other vane should be at lower potential d) Both the vanes should be at lower potential than the test body Answer: One vane should be at higher pot...