Central and State Pollution Control Board recruitment (Scientist, Environmental Engineer, AEE) · India · Central Pollution Control Board and State Pollution Control Boards / state PSCs
Original practice questions written to the published syllabus · not past papersHow environmental samples are taken and analysed and how good the numbers are: sampling plans, gravimetric and volumetric methods, spectroscopy, chromatography, quality assurance and monitoring networks.
In the exams: UGC NET Environmental Sciences Unit 2; ICAR AIEEA-PG Physical Science Unit II (instrumental analysis); ICAR AICE Aquatic Environmental Management Unit 3
How our questions for Central and State Pollution Control Board recruitment spread across the units of Environmental Monitoring & Instrumental Analysis. Difficulty: 6 easy, 15 medium, 2 hard.
| Sampling and preservation of water, soil, air and biota | 5 | |
| Quality assurance, quality control and laboratory accreditation | 4 | |
| Monitoring objectives and network design | 3 | |
| Gravimetric and volumetric analysis | 3 | |
| Continuous and low-cost sensor monitoring | 3 | |
| Atomic absorption and ICP techniques | 2 | |
| UV-visible spectrophotometry and colorimetry | 1 | |
| Electrochemical methods and sensors | 1 | |
| Detection limits, accuracy, precision and calibration | 1 |
Choose an answer, then open the working. Each explanation says why the right answer is right and why the others are not.
What does the US EPA's data quality objectives process require before sampling begins?
C. Defining the decision and tolerable errors
DQOs derive sampling design from the decision and acceptable errors, not from convenience.
Further reading: See the manual sources: Standard Methods; Harris; Skoog et al.; CPCB monitoring guidelines; ISO/IEC 17025
How should water samples for dissolved metal analysis usually be preserved?
D. Filtration and nitric acid to pH below 2
Nitric acid keeps metals in solution and prevents adsorption; thiosulphate is for chlorinated microbiological samples.
Further reading: See the manual sources: Standard Methods; Harris; Skoog et al.; CPCB monitoring guidelines; ISO/IEC 17025
What is isokinetic sampling in stack monitoring?
C. Sampling at the stack gas velocity
Faster or slower sampling would under- or over-collect large particles because of their inertia.
Further reading: See the manual sources: Standard Methods; Harris; Skoog et al.; CPCB monitoring guidelines; ISO/IEC 17025
Hexavalent chromium is commonly measured colorimetrically using
C. 1,5-diphenylcarbazide in acid
Diphenylcarbazide forms a red-violet complex with Cr(VI) at about 540 nm.
Further reading: See the manual sources: Standard Methods; Harris; Skoog et al.; CPCB monitoring guidelines; ISO/IEC 17025
Which electrode is a standard method for measuring fluoride in drinking water?
C. Lanthanum fluoride ISE
The LaF3 crystal ISE responds to fluoride; TISAB fixes ionic strength and releases complexed fluoride.
Further reading: See the manual sources: Standard Methods; Harris; Skoog et al.; CPCB monitoring guidelines; ISO/IEC 17025
Which QC sample detects contamination introduced during field handling and transport?
B. Field blank
Field blanks are analyte-free water taken through field procedures; spikes test recovery; CRMs test accuracy.
Further reading: See the manual sources: Standard Methods; Harris; Skoog et al.; CPCB monitoring guidelines; ISO/IEC 17025
Beta attenuation monitors are used to measure
B. particulate matter mass concentration
BAMs measure the attenuation of beta radiation by particles collected on filter tape.
Further reading: See the manual sources: Standard Methods; Harris; Skoog et al.; CPCB monitoring guidelines; ISO/IEC 17025
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