Friday, June 18, 2021

WBCS Polity and Constitution MCQs Prelims and Mains

Exam Preparation of General Science (Chemistry) with PDF Notes P30


Page 30

90074291. Oxygen which is vital for life is a product of photosynthesis and comes from
A
carbonates from soil
B
carbon dioxide
C
water
D
oxides of mineral elements
C
Correct Answer: C. water
90115292. The gas used for artificial fruit ripening of green fruit is —
A
Ethylene
B
Acetylene
C
Ethane
D
Methane
A
Correct Answer: A. Ethylene
90029293. Cokking gas is a mixture of
A
methane and ethylene
B
carbon dioxide and oxygen
C
butane and propane
D
carbon monoxide and carbon dioxide
C
Correct Answer: C. butane and propane
90047294. German silver is an alloy of
A
copper, nickel and silver
B
silver, copper and aluminium
C
zinc, copper and nickel
D
zinc, silver and copper
C
Correct Answer: C. zinc, copper and nickel
90043295. Fermentation of milk to curd is due to
A
Mycobacterium
B
StaphylocoCcus
C
Lactobacillus
D
Yeasts
C
Correct Answer: C. Lactobacillus
90176296. Which of the following imparts a deep blue color to glass?
A
Cobalt oxide
B
Cupric oxide
C
Ferrous oxide
D
Nickel oxide
D
Correct Answer: D. Nickel oxide
90170297. Which metal is extracted from sea water?
A
Potassium
B
Magnesium
C
Aluminium
D
Beryllium
B
Correct Answer: B. Magnesium
90054298. Helium gas is used in gas balloons instead of hydrogen gas because it is
A
lighter than hydrogen
B
more abundant than hydrogen
C
non-combustible
D
more stable
C
Correct Answer: C. non-combustible
90173299. Which of the following elements is non-radioactive?
A
Uranium
B
Thorium
C
Plutonium
D
Zirconium
D
Correct Answer: D. Zirconium
90145300. The tip of the match-stick contains
A
phosphorus pentoxide
B
white phosphorus
C
red phosphorus
D
phosphorus trichloride
C
Correct Answer: C. red phosphorus



WBCS Polity and Constitution MCQs Prelims and Mains

General Science MCQ PDF Download For Competitive Exam P29


Page 29

90184281. Which of the following is used to iodize common salt?
A
Potassium iodide
B
Iodine
C
Potassium iodate
D
Sodium iodide
C
Correct Answer: C. Potassium iodate
90085282. Seaweeds are an important source of
A
iron
B
chlorine
C
bromine
D
iodine
D
Correct Answer: D. iodine
90005283. Aluminium can be purified by
A
oxidation
B
distillation
C
electrolysis
D
ozonolysis
C
Correct Answer: C. electrolysis
90167284. Which gas is used as a fire extinguisher ?
A
Carbon dioxide
B
Carbon monoxide
C
Carbon suboxide
D
Sulphur dioxide
A
Correct Answer: A. Carbon dioxide
90126285. The metallic constituents of hard water are
A
Magnesium, calcium and tin
B
Iron, tin and calcium
C
Calcium, magnesium and iron
D
Magnesium, tin and iron
C
Correct Answer: C. Calcium, magnesium and iron
90136286. The polymerisation of which of the following is used in the manufacturing of polythene in the industry?
A
Methane
B
Styrene
C
Acetylene
D
Ethylene
D
Correct Answer: D. Ethylene
90150287. Vinegar made by fermentation from cane sugar contains
A
palmitic acid
B
lactic acid
C
citric acid
D
acetic acid
D
Correct Answer: D. acetic acid
90075288. Ozone consists of
A
Oxygen only
B
Oxygen and Nitrogen
C
Hydrogen and Carbon
D
Oxygen and Carbon
A
Correct Answer: A. Oxygen only
90010289. An atomic pile is used for
A
producing X-rays
B
conducting nuclear fission
C
conducting thermonuclear fusion
D
accelerating atoms
B
Correct Answer: B. conducting nuclear fission
90183290. Which of the following is used to denature ethanol?
A
Methyl alcohol
B
Propyl alcohol
C
Phenol
D
Methane
A
Correct Answer: A. Methyl alcohol



WBCS Polity and Constitution MCQs Prelims and Mains

General Science (Chemistry) Practice Sets For Competitive Exam P28


Page 28

90018271. Bhopal gas tragedy is associated with leakage of
A
carbon dioxide
B
nitrogen dioxide
C
sulphur dioxide
D
methyl isocyanate
D
Correct Answer: D. methyl isocyanate
90062272. Litmus is obtained from
A
a bacterium
B
a fungus
C
an alga
D
lichen
D
Correct Answer: D. lichen
90039273. Dry powder fire extinguishers contain
A
sand
B
sand and sodium carbonate
C
sand and potassium carbonate
D
sand and sodium bicarbonate
D
Correct Answer: D. sand and sodium bicarbonate
90053274. Helium gas is filled in ballons because
A
its atomic number is 2
B
it is lighter than air
C
it is one of the constituents of water
D
it is a noble gas
B
Correct Answer: B. it is lighter than air
90021275. Brass is an alloy of
A
Lead and tin
B
Zinc and copper
C
Antimony, tin and lead
D
Zinc, tin and copper
B
Correct Answer: B. Zinc and copper
90050276. Gold dissolves in
A
Hydrochloric acid
B
Nitric acid
C
Aqua-regia
D
Acetic acid
C
Correct Answer: C. Aqua-regia
90160277. What is the most commonly used substance in fluorescent tubes?
A
Sodium oxide and argon
B
Sodium vapor and neon
C
Mercury vapor and argon
D
Mercury oxide and neon
C
Correct Answer: C. Mercury vapor and argon
90070278. Non-stick kitchenwares are coated with
A
PVC
B
Graphite
C
Teflon
D
Silicon
C
Correct Answer: C. Teflon
90129279. The most abundant inert gas in the atmosphere is
A
Helium
B
Neon
C
Argon
D
Krypton
C
Correct Answer: C. Argon
90194280. Which one of the following is radioactive?
A
Cesium
B
Platinum
C
Strontium
D
Thorium
D
Correct Answer: D. Thorium



WBCS Polity and Constitution MCQs Prelims and Mains

Important MCQ on General Science Chemistry P27


Page 27

90151261. Vulcanization of rubber is carried out by adding
A
Sulphur
B
Carbon
C
Ozone
D
Phosphorus
A
Correct Answer: A. Sulphur
90154262. What are the major pollutants of cigarette smoke?
A
Carbon monoxide and dioxin
B
Carbon monoxide and nicotine
C
Carbon monoxide and benzene
D
Dioxin and benzene
B
Correct Answer: B. Carbon monoxide and nicotine
90119263. The iron ore which contains 72% of iron is
A
Magnetite
B
Limonite
C
Haematite
D
Siderite
A
Correct Answer: A. Magnetite
90118264. The hardest allotrope of carbon is
A
diamond
B
graphite
C
coke
D
lamp black
A
Correct Answer: A. diamond
90120265. The isotope of Uranium used in atomic reactors is
A
U-235
B
U-236
C
U-237
D
U-232
A
Correct Answer: A. U-235
90032266. Denatured spirit is ethanol mixed with
A
Petrol
B
Kerosene
C
Water
D
Pyridine
D
Correct Answer: D. Pyridine
90034267. Detergents clean surfaces on the principle of
A
viscosity
B
surface tension
C
elasticity
D
floatation
B
Correct Answer: B. surface tension
90205268. Which variety of coal contains recognisable traces of the original plant material?
A
Anthracite
B
Lignite
C
Peat
D
Bitumen
C
Correct Answer: C. Peat
90081269. Quartz is a crystalline form of
A
Alumina
B
Glass
C
Silica
D
Limestone
C
Correct Answer: C. Silica
90157270. What is the chemical name of 'Baking Soda'?
A
Sodium carbonate
B
Sodium bicarbonate
C
Sodium nitrite
D
Sodium nitrate
B
Correct Answer: B. Sodium bicarbonate



WBCS Polity and Constitution MCQs Prelims and Mains

GS Practice Sets For Competitive Exam Preparation P26


Page 26

90114251. The Fungus which is used in the alcohol industry Is
A
Mushroom
B
Candida Aibicans
C
Yeast
D
Rhizopus
C
Correct Answer: C. Yeast
90178252. Which of the following is a supercooled liquid?
A
Ice Cream
B
Teflon
C
Glass
D
Mercury
C
Correct Answer: C. Glass
90045253. Galena is a mineral of
A
iron
B
gold
C
lead
D
calcium
C
Correct Answer: C. lead
90038254. Drinking soda is
A
Alkaline
B
Acidic
C
Neutral
D
Oxidant
B
Correct Answer: B. Acidic
90134255. The nucleus of an atom consists of.
A
Proton
B
Neutron
C
Proton and Neutron
D
Electron, Proton and Neutron
C
Correct Answer: C. Proton and Neutron
90112256. The ft fundamental particles present in the nucleus of an atom are
A
Electron, proton
B
Proton, neutron
C
Neutron, electron
D
Neutron, positron
B
Correct Answer: B. Proton, neutron
90127257. The metals commonly used for electroplating are
A
Gold, Sodium and Chromium
B
Chromium, Copper and Nickel
C
Nickel, Lead and Chromium
D
Gold, Sodium and Potassium
B
Correct Answer: B. Chromium, Copper and Nickel
90177258. Which of the following is a mono-atomic gas?
A
Oxygen
B
Neon
C
Nitrogen
D
Fluorine
B
Correct Answer: B. Neon
90122259. The main source of Naphthalene is
A
Charcoal
B
Camphor
C
Coal-tar
D
Diesel
C
Correct Answer: C. Coal-tar
90017260. Aspirin is the common name of
A
Salicylic Acid
B
Salicylate
C
Methyl Salicylate
D
Acetyl Salicylic Acid
D
Correct Answer: D. Acetyl Salicylic Acid



WBCS Polity and Constitution MCQs Prelims and Mains

General Science (Chemistry) For Competitive Exam Preparation P25


Page 25

90191241. Which one of the following gases has the highest calorific value?
A
Natural gas
B
Water gas
C
Coal gas
D
Indane gas
D
Correct Answer: D. Indane gas
90168242. Which is abundant in Gobar gas?
A
Carbon dioxide
B
Methane
C
Oxygen
D
Hydrogen
B
Correct Answer: B. Methane
90104243. The chemical used in embalming biological materials is
A
formaldehyde in water
B
formaldehyde in methanol
C
ethylene glycol
D
gaseous formaldehyde
A
Correct Answer: A. formaldehyde in water
90149244. Urea is a
A
Sodium fertilizer
B
Phosphatic fertilizer
C
Nitrogenous fertilizer
D
Potassium fertilizer
C
Correct Answer: C. Nitrogenous fertilizer
90117245. The gas which turns into liquid at the lowest temperature among the following is
A
hydrogen
B
oxygen
C
helium
D
nitrogen
A
Correct Answer: A. hydrogen
90048246. Glass is a
A
pure solid
B
supercooled liquid
C
gel
D
polymer
B
Correct Answer: B. supercooled liquid
90188247. Which of the toxic heavy metals is found in modern tannery industries?
A
Nickel
B
Zinc
C
Chromium
D
Lead
C
Correct Answer: C. Chromium
90046248. Galvanization of iron is carried out using
A
Zinc
B
Tin
C
Copper
D
Chromium
A
Correct Answer: A. Zinc
90098249. The acid used in lead storage cells is
A
phosphoric acid
B
hydrochloric acid
C
nitric acid
D
sulphuric acid
D
Correct Answer: D. sulphuric acid
90161250. What is the name of that system. which uses radioactivity to decide the period of materials of-pre-his-toric period ?
A
Radium dating
B
Uranium dating
C
Carbon dating
D
Deuterium dating
C
Correct Answer: C. Carbon dating