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

What is Pt 100?  Basically that A platinum resistance temperature detector (PRTD) has a resistance of 100Ω at 0°C with a temperature coefficient of 0.00385Ω/°C.

Chromatography Multiple Choice Questions and Answers 1. In Thin layer chromatography, the stationary phase is made of _________ and the mobile phase is made of _________ a) Solid, liquid b) Liquid, liquid c) Liquid, gas d) Solid, gas Answer: Solid, liquid. 2. Chromatography is a physical method that is used to separate and analyse __________ a) Simple mixtures b) Complex mixtures c) Viscous mixtures d) Metals Answer: Complex mixtures. 3. In Gas-liquid phase chromatography, the stationary phase is composed of _________ and the mobile phase is made of _________ a) Solid, liquid b) Liquid, liquid c) Liquid, gas d) Solid, gas Answer: Liquid, gas. 4. In Column chromatography, the stationary phase is made of _________ and the mobile phase is made of _________ a) Solid, liquid b) Liquid, liquid c) Liquid, gas d) Solid, gas Answer: Solid, liquid. 5. In chromatography, the stationary phase can be ___________ supported on a solid. a) Solid or liquid b) Liquid or gas c) Solid only d) Liquid only

What is the application of bimetallic strips?  Bimetallic thermometers basically use bimetallic strips to measure local temperatures in process industries. And spiral bimetallic strips are used in air conditioning thermostats. And it is used for simple on/off switching applications.