Bihar SBTE Diploma Chemical 6th SEM May 2019 Paper on Environmental Technology
| Sr. No. | Questions with options |
| 1 | Operating principle of cyclone separator is based on the action of _____dust particles.
(a) Diffusion of (b) Centrifugal force on (c) Gravitational force on (d) Electrostatic force in |
| 2 | Exposure to small amount of _______results in high blood pressure and heart dieases in human beings
(a) Hydrogen sulfide (b) Mercury (c) Cadmium (d) Asbestos |
| 3 | Maximum allowable concentration of CO2 in air for safe working is ______ppm
(a) 50 (b) 1000 (c) 2000 (d) 5000 |
| 4 | Tolerable limit of nitrogen oxides in air is ________ppm
(a) 0.1 (b) 1.0 (c) 5.0 (d) 25.0 |
| 5 | Which of the following is the common pollutant emitted from metallurgical smelters, thermal plant and cement plants?
(a) NOx (b) Hg (c) SO2 (d) F |
| 6 | Which is secondary air pollutant?
(a) Photochemical smog (b) Sulfur dioxide (c) Nitrogen dioxide (d) Dust particles |
| 7 | TLV of mercury in potable water is about ______ppm
(a) 0.001 (b) 0.1 (c) 1.0 (d) 5.0 |
| 8 | Scale formation in boiler is controlled by
(a) Pre heating of feed water (b) Reduction in hardness, silica and alumina in feed water (c) Keeping the pH value of feed water just below 7 (d) Eliminating H2S in feed water |
| 9 | Main pollutant present in automobile exhaust is
(a) SO2 (b) CO2 (c) CO (d) Hydrogen |
| 10 | COD of new municipal sewage may be in the range of about _____ mg/lit.
(a) 1-2 (b) 5- 10 (c) 150 – 300 (d) 2000 – 3000 |
| 11 | Salt content in sea water is about ____ percent
(a) 0.5 (b) 1.0 (c) 3.5 (d) 10.0 |
| 12 | Dose of chlorine for disinfection of water’s about _____mg/lit of water
(a) 0.01 (b) 0.1 (c) 0.3 (d) 1.0 |
| 13 | Presence of bacteria in potable water causes
(a) Turbidity (b) Disease (c) Bad odour (d) Bad taste & color |
| 14 | _____ is the process of killing organism in water
(a) Coagulation (b) Sterilization (c) Disinfection (d) Sedimentation |
| 15 | Dissolved oxygen content in river water is around ______ppm
(a) 5 (b) 100 (c) 250 (d) 500 |
| 16 | Which of the following is NOT considered as a pollutant?
(a) CO (b) CO2 (c) SO2 (d) NO2 |
| 17 | The main source of CFC in household sector is
(a) Refrigerators (b) Television (c) Washing machine (d) None of these |
| 18 | Turbidity of water is an indication of the presence of
(a) Suspended inorganic matter (b) Dissolved solids (c) Floating solids (d) Dissolved gases |
| 19 | The main pollutant in waste water discharged from a petroleum refinery is oil. Oil is removed by
(a) Biological oxygen pond (b) A rated lagoon (c) Trickling filters (d) Gravity separator having oil skimming device |
| 20 | The ratio of oxygen available to the oxygen required for stabilization of sewage is called
(a) Bacterial stability factor (b) Relative stability (c) Biological oxygen demand (d) None of these |
| Data Collected By – Rashmi | |
| Published On – 13th June 2022 | |
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