MCQ in Environmental Engineering Part 6 | Engineering Board Exam

(Last Updated On: July 30, 2022)

This is the Multiple Choice Questions Part 6 of the Series in Environmental Engineering (Environmental Science) as one of the General Engineering and Applied Sciences (GEAS) topic. In Preparation for the ECE Board Exam make sure to expose yourself and familiarize in each and every questions compiled here taken from various sources including past Board Questions in General Engineering and Applied Sciences (GEAS) field.

Continue Practice Exam Test Questions Part 6 of the Series

⇐ MCQ in Environmental Engineering Part 5 | Engineering Board Exam

Choose the letter of the best answer in each questions.

251. The disadvantage of hard water is

A. More soap consumption

B. Scale formation in boilers

C. Corrosion of pipes

D. Loss of taste in food

E. All of the above

252. The permissible hardness of water for public supplies is

A. 10 mg/liter

B. 25 mg/liter

C. 75 mg/liter

D. 115 mg/liter

E. 400 mg/liter

253. For the combustion of 1 kg of carbon, the quantity of oxygen required is

A. 2.62 kg

B. 3.67 kg

C. 8 kg

D. 11.6 kg

E. None of the above

254. For controlling algae, the chemical generally used is

A. alum

B. lime

C. copper sulphate

D. bleaching powder

E. None of the above

255. Soft waters

A. Have corrosive action on metals

B. Dissolve lead

C. Corrode iron

D. All of the above

E. None of the above

256. What will be the colour of red rose when it is seen through green glass?

A. White

B. Black

C. Pink

D. Brown

E. Green

257. Acute poisoning may be the result of entry into the body of large of concentrated doses of poison through

A. Breathing

B. Swallowing

C. Skin absorption

D. Injection

E. Any of the above

258. Carbon dioxide has all the following properties EXCEPT that it is

A. colourless

B. odourless

C. tasteless

D. readily soluble in water

E. None of the above

259. The number of air changes per hour recommended for auditoria is

A. 3 to 6

B. 6 to 10

C. 10 to 12

D. 15 to 20

E. None of the above

260. Identify the incorrect statement if any Zeolite process is suitable for

A. Removing temporary hardness

B. Removing permanent hardness

C. Cent percent removal of hardness

D. Acidic waters

E. When zeolite becomes inactive, it may be reactivated by flushing with brine solution

261. Which of the following constituent of air has the least percentage?

A. Argon

B. Carbon dioxide

C. Xenon

D. Neon

E. Helium

262. While smoke from a diesel engine can be expected during

A. Start up or idling

B. High load operating

C. High speed operation

D. All of the above

E. None of the above

263. If with minimum quantity of potassium permanganate, the pink colour of water disappears soon, then it shows that

A. Water is hard

B. Water is acidic

C. Water is alkaline

D. Organic matter is present in water

E. Chlorine content is high in water

264. Plants that grow in absence of sub light in water, are called

A. Algae

B. Shrubs

C. Fungi

D. Any of the above

E. All of the above

265. Which one of the following gases shows a different behavior at high pressure?

A. Carbon dioxide

B. Water vapours

C. Hydrogen

D. Ozone

E. None of these

266. Bleaching power is

A. Lime

B. Stacked lime

C. Chloride of lime

D. Hypo-chloride of lime

E. Hypo-chlorite of lime

267. The odour of water is expressed in terms of threshold number. The maximum threshold number permitted for public supplies is

A. 10

B. 5

C. 3

D. 2

E. 1

268. The percentage of nitrogen in air by weight is around

A. 75.5 percent

B. 65.5 percent

C. 24.3 percent

D. 23.1 percent

E. 20.3 percent

269. What is a laser?

A. Electro-magnetic waves

B. Ultrasonic waves

C. Supersonic waves

D. Light amplification by stimulated emission of radiation

E. Green

270. All of the following pollutants affect heart EXCEPT

A. Cadmium

B. Arsenic

C. Lead

D. Carbon monoxide

E. None of the above

271. The permissible hardness of water for low pressure boiler is

A. 50 mg/liter

B. 150 mg/liter

C. 250 mg/liter

D. 350 kg/liter

E. 450 mg/liter

272. Desalination is usually needed for

A. well water

B. rainwater

C. sea water

D. river water

E. None of the above

273. To keep the water safe against pathogenetic bacteria the residual chlorine should remain between

A. 0.05 to 0.2 ppm

B. 0.2 to 0.8 ppm

C. 1 ppm to 2 ppm

D. 6 ppm to 10 ppm

E. 10 ppm to 20 ppm

274. Which of the following industry is least polluting?

A. Cement industry

B. Oil refinery

C. Thermal power plants

D. Electronic industry

E. Rolling mills

275. Carbon monoxide poisoning may cause

A. headache

B. drowsiness

C. dizziness

D. Any of the above

E. None of the above

276. When the trees are planted by roadside, the average distance between two trees should be

A. 2 to 3 meters

B. 5 to 8 meters

C. 10 to 15 meters

D. 25 to 30 meters

E. None of the above

277. Addition to alum increases

A. hardness of water

B. carbonates of water

C. sulphates in water

D. Acidity of water

E. None of the above

278. If the pH of water is 7 it means the water is

A. acidic

B. alkaline

C. neutral

D. free from oxygen

E. None of the above

279. The volume fraction of ozone in atmospheric air is nearly

A. 0.02 ppm

B. 0.2 ppm

C. 2 ppm

D. 20 ppm

E. None of the above

280. Suspended liquid droplets generated by condensation from the gaseous to the liquid state or by breaking up a liquid into a dispersed state is known as

A. Dust

B. Fume

C. Mist

D. Vapours

E. None of the above

281. The maximum acceptable noise level in offices is

A. 10 dB

B. 40 dB

C. 75 dB

D. 100 dB

E. None of the above

282. Type of radiation expected from carbon 14 is

A. Alpha

B. Beta

C. Gamma

D. Alpha, Beta, Gamma

E. None of the above

283. The pH value of sea water is usually

A. 1

B. Between 3 and 5

C. Between 5 and 7

D. Between 8 and 8.3

E. Between 13.7 and 14

284. Which of the following is the major source of pollutant hydrogen sulphide?

A. Decaying organic matter

B. Auto exhaust

C. Oil burners

D. Solar energy

E. None of the above

285. The pH value of concentrated sulphuric acid could be expected between

A. 7 and 6

B. 6 and 5

C. 4 and 3

D. 3 and 1

E. 1 and 0

286. Ultra-violet rays are used for the treatment of water known as

A. Dechlorination

B. Disinfection

C. Aeration

D. Filtration

E. Bleaching

287. The process of killing at the pathogenic bacteria of water-borne diseases to make it safe for hospital use, is known as

A. Zeoliting

B. Debacterialisation

C. Sterilization

D. Aeration

E. Chlorination

288. Electric fuses provide protection against

A. sparking

B. overloads

C. single phasing

D. low current and voltage

E. None of the above

289. In one liter sample of drinking water the coliform organism should not exceed

A. 1000

B. 500

C. 100

D. 10

E. 1

290. When the trees are to be planted by the roadside the minimum distance from the out edge of side width should be

A. 0.5 to 1 meter

B. 2 to 3 meters

C. 5 to 8 meters

D. 12 to 15 meters

E. None of the above

291. All of the following are sound absorptive materials EXCEPT

A. Rugs

B. Mirrors

C. Carpets

D. Heavy drapes

E. None of the above

292. Which of the following pollutant results from decaying organic matter?

A. Acetylene

B. Ozone

C. Ammonia

D. Nitric oxide

E. None of the above

293. All of the following pollutants result from auto-exhaust EXCEPT

A. Acetylene

B. Olefins

C. Hydrogen sulphide

D. Ethylene

E. None of the above

294. Dust particles in industrial processes may be generated by

A. Crushing

B. Grinding

C. Detonation

D. Rapid impact

E. Any of the above processes

295. Turbidity in water may be removed by

A. Sedimentation

B. Filtration

C. Agitation

D. Aeration

E. Oxidation

296. Which of the following area of work needs lowest level of illumination?

A. Engraving

B. Cloth inspection

C. Assembly of instrument

D. Paper converting processes

E. None of the above

297. Which one of the following is not directly related to the phenomenon of evaporation?

A. Temperature of liquid

B. Volume of the liquid

C. Surface area of the liquid

D. Surface winds over the liquid

E. None of these

298. For the maximum acidity of water, pH value would be

A. 0.01

B. 0.1

C. 1

D. 10

E. 11

299. The process of passing the water through a thick layer of filtering media is known as

A. Sedimentation

B. Filtration

C. Disinfection

D. Purification

E. Putrification

300. Which of the following is an insect born disease?

A. Q-fever

B. Ring worm

C. Jaundice

D. Tetanus

E. None of the above

Complete List of MCQs in General Engineering and Applied Science per topic