General Science PYQ – Metallurgy and Chemistry in Everyday Life – Part 1 (Q 1–30)
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The Neyveli Lignite Corporation, now NLC India, was set up by the Government of India in 1956.
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General Science PYQ – Metallurgy and Chemistry in Everyday Life – Part 1 (Q 1–30) – 29 questions, subject: Science. Every question has the correct answer with a one-line explanation; tap "Show Answer". Free practice for TNPSC, UPSC, SSC, Bank and RRB exams – Shanmugam IAS Academy, Coimbatore.
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1.
1. Refining of metal
2. Concentration of ore
3. Production of crude metal
Hostel Supdt. cum PTO 2024
Arrange the following steps involved in the metallurgical process:1. Refining of metal
2. Concentration of ore
3. Production of crude metal
Correct Answer: B [2, 3, 1]
Explanation:
In metallurgy the ore is first concentrated, then crude metal is extracted (roasting/reduction), and finally the metal is refined, giving the order 2, 3, 1.
2.
[R]: Wolframite ore is concentrated by the froth floatation method.
CTS (ITI Posts) 2025
[A]: Froth floatation is commonly used to concentrate sulphide ores.[R]: Wolframite ore is concentrated by the froth floatation method.
Correct Answer: A [[A] is true but [R] is false]
Explanation:
Sulphide ores are concentrated by froth flotation because oil wets them, but wolframite is magnetic and is concentrated by magnetic separation, so A is true and R is false.
3.
(i) Zinc blende is concentrated by magnetic separation process
(ii) Haematite is concentrated by gravity separation process
(iii) Aluminium is produced by the electrolytic reduction of fused alumina
(iv) Matte is a mixture of cupric sulphide and ferrous sulphide
Group 4 2022
Which of the following statements are true?(i) Zinc blende is concentrated by magnetic separation process
(ii) Haematite is concentrated by gravity separation process
(iii) Aluminium is produced by the electrolytic reduction of fused alumina
(iv) Matte is a mixture of cupric sulphide and ferrous sulphide
Correct Answer: C [(ii) and (iii)]
Explanation:
Haematite is concentrated by gravity separation and aluminium is obtained by electrolytic reduction of molten alumina, while zinc blende is concentrated by froth flotation, so (ii) and (iii) are true.
4.
GSCE 2021
Elements like Silicon and Germanium to be used as a semi conductor is purified by _____ method.Correct Answer: B [Zone-refining]
Explanation:
Zone refining, in which a molten zone is moved along a rod carrying impurities to one end, is used to purify semiconductors like silicon and germanium.
5.
(i) Hematite ore – Oxide of iron
(ii) Magnetite ore – Black ore
(iii) Limonite – Dolomite
(iv) Siderite – Iron carbonate
Group 2/2A 2024
Which of the following are correctly paired?(i) Hematite ore – Oxide of iron
(ii) Magnetite ore – Black ore
(iii) Limonite – Dolomite
(iv) Siderite – Iron carbonate
Correct Answer: C [(i), (ii) and (iv) only]
Explanation:
Haematite is iron oxide, magnetite is the black ore and siderite is iron carbonate, whereas limonite is hydrated iron oxide, not dolomite, so (i), (ii) and (iv) are correct.
6.
(i) Beryllium – Crookesite
(ii) Thallium – Colemanite
(iii) Aluminium – Bauxite
(iv) Germanium – Germanite
Library Service 2023
Which of the following are incorrectly paired?(i) Beryllium – Crookesite
(ii) Thallium – Colemanite
(iii) Aluminium – Bauxite
(iv) Germanium – Germanite
Correct Answer: B [(i) and (ii) only]
Explanation:
Crookesite is a thallium ore and colemanite is a boron ore, so Beryllium - Crookesite and Thallium - Colemanite are incorrect pairs.
7.
(a) Corundum – 1. Gasoline
(b) Vanadium – 2. Abrasives
(c) Titanium – 3. Alloys
(d) Lead – 4. Pigments
Group 2A Mains Re-Exam 2026
Match Column-I with Column-II:(a) Corundum – 1. Gasoline
(b) Vanadium – 2. Abrasives
(c) Titanium – 3. Alloys
(d) Lead – 4. Pigments
Correct Answer: B [2 3 4 1]
Explanation:
Corundum is an abrasive, vanadium is used in alloys, titanium in pigments and lead in gasoline additives, giving 2 3 4 1.
8.
Group 1 2021
In the Haber's process for the manufacture of ammoniaCorrect Answer: A [Finely divided iron is used as a catalyst]
Explanation:
In the Haber process N2 and H2 combine in a 1:3 ratio at about 200 atm and 450-500 degrees C over finely divided iron catalyst.
9.
Asst. Conservator of Forests 2023
Ammonia is prepared byCorrect Answer: B [Haber's process]
Explanation:
Ammonia is manufactured industrially by Haber's process, N2 + 3H2 giving 2NH3, whereas Solvay's process makes sodium carbonate.
10.
Asst. Training Officer (Textile) 2023
NPK stands forCorrect Answer: B [Nitrogen, Phosphorus, Potassium]
Explanation:
NPK stands for nitrogen, phosphorus and potassium, the primary plant nutrients.
11.
Bursar 2023 · Hostel Supdt. cum PTO 2024
The most vital three elements (Primary Nutrients) for the growth of plants areCorrect Answer: A [K, P and N]
Explanation:
Nitrogen, phosphorus and potassium are the primary nutrients needed in large amounts for plant growth.
12.
GSHA 2021 · Junior Scientific Officer 2023
Which one of the following fertilizers has the highest nitrogen content?Correct Answer: C [Urea]
Explanation:
Urea contains about 46 per cent nitrogen, the highest among common solid fertilizers.
13.
Road Inspector 2023
Among the following, which is a nitrogenous fertilizer?Correct Answer: A [Urea]
Explanation:
Urea, CO(NH2)2, is a nitrogenous fertilizer, whereas potassium sulphate is a potash fertilizer, bone ash a phosphate source and gypsum a calcium and sulphur source.
14.
Jailor 2023
Which of the following compounds is used as a fertilizer?Correct Answer: A [Ammonium chloride]
Explanation:
Ammonium chloride contains about 25 per cent nitrogen and is used as a nitrogen fertilizer, particularly for rice.
15.
(i) Fertilizer must be insoluble in water
(ii) It should maintain the pH of 10 to 13
(iii) It should not be poisonous to plants
Group 1 2022
Which among the following is/are wrong about a fertilizer?(i) Fertilizer must be insoluble in water
(ii) It should maintain the pH of 10 to 13
(iii) It should not be poisonous to plants
Correct Answer: B [(i) and (ii)]
Explanation:
A good fertilizer should be soluble in water so plants can absorb it and should not alter soil pH greatly, so statements (i) and (ii) are wrong.
16.
Field Surveyor 2022
The left over slurry in biogas production is a good manure rich inCorrect Answer: B [Nitrogen and phosphorus]
Explanation:
The slurry left after biogas production is a good manure rich in nitrogen and phosphorus.
17.
Executive Officer Gr. III (HR&CE) 2022
Bordeaux mixture containsCorrect Answer: A [CuSO₄ + lime]
Explanation:
Bordeaux mixture is a fungicide made of copper sulphate and slaked lime, first used in Bordeaux, France on grape vines.
18.
Health Officer 2023
Gammexane is the trade name of which of the following?Correct Answer: A [Benzene hexachloride]
Explanation:
Gammexane (lindane) is the trade name of the gamma isomer of benzene hexachloride, an insecticide.
19.
CTS (Interview Posts) 2024
Methoxychlor isCorrect Answer: A [p,p'-dimethoxy diphenyl trichloroethane]
Explanation:
Methoxychlor is a DDT-like chlorinated insecticide, p,p'-dimethoxy diphenyl trichloroethane, with methoxy groups at the para positions of both rings.
20.
Asst. Public Prosecutor Gr. II 2025
Lead arsenate is used as aCorrect Answer: D [Insecticide]
Explanation:
Lead arsenate is an inorganic stomach poison used as an insecticide against leaf-eating insects.
21.
Combined Research Assistant 2023
The chemical name of the weedicide 2,4,5-T isCorrect Answer: B [2,4,5-trichlorophenoxyacetic acid]
Explanation:
2,4,5-T is the herbicide 2,4,5-trichlorophenoxyacetic acid, used against broad-leaved weeds.
22.
CEGS 2024
Treflan (trifluralin) is manufactured fromCorrect Answer: B [p-Chlorobenzotrifluoride]
Explanation:
Trifluralin (Treflan), a herbicide, is made by dinitration of p-chlorobenzotrifluoride followed by reaction with dipropylamine.
23.
Accounts Officer (Treasury) 2022
Choose a highly selective rodenticide for rats among sodium fluoroacetate, alpha-naphthyl urea, norbormide and thallium acetate.Correct Answer: C [Norbormide]
Explanation:
Norbormide is a highly selective rodenticide, toxic mainly to rats and of low toxicity to other animals.
24.
(a) Anilinopyrimidines – 1. Herbicide
(b) 2,4-D – 2. Rodenticide
(c) Zinc phosphide – 3. Fungicide
(d) Parathion – 4. Insecticide
District Educational Officer 2023
Match the following:(a) Anilinopyrimidines – 1. Herbicide
(b) 2,4-D – 2. Rodenticide
(c) Zinc phosphide – 3. Fungicide
(d) Parathion – 4. Insecticide
Correct Answer: A [3 1 2 4]
Explanation:
Anilinopyrimidines are fungicides, 2,4-D is a herbicide, zinc phosphide is a rodenticide and parathion is an insecticide, giving 3 1 2 4.
25.
(1) Synthetic fertilizers – Urea, ammonium sulphate, potash
(2) Insecticides – Sevin, malathion, thiodan
(3) Fungicides – Tok E-25, Basalin, Dalapon
(4) Herbicides – Blitox, Captan, Tilt
CTS (Interview Posts) 2025
Which is/are incorrectly paired?(1) Synthetic fertilizers – Urea, ammonium sulphate, potash
(2) Insecticides – Sevin, malathion, thiodan
(3) Fungicides – Tok E-25, Basalin, Dalapon
(4) Herbicides – Blitox, Captan, Tilt
Correct Answer: D [(3) and (4) only]
Explanation:
Dacthal, Basalin and Dalapon are herbicides, not fungicides, and statement (4) is also wrongly paired, so (3) and (4) are incorrect.
26.
District Educational Officer 2023
Which biopesticide has been proven to be very effective in controlling locusts?Correct Answer: A [Metarhizium acridum]
Explanation:
The fungus Metarhizium acridum is a biopesticide that specifically infects locusts and grasshoppers without harming other organisms.
27.
Executive Officer Gr. IV (HR&CE) 2022
Which product obtained from coal tar is used to repel moths and other insects?Correct Answer: C [Naphthalene]
Explanation:
Naphthalene, obtained from coal tar, is used as moth balls to repel moths and insects.
28.
PSY 2022 · Veterinary Assistant 2023
Anthracite is a ______ coal.Correct Answer: A [High quality]
Explanation:
Anthracite has the highest carbon content (over 90 per cent), burns with little smoke and is the highest quality coal.
29.
Group 2/2A 2024
The Neyveli Lignite Corporation was established by the Government of India in the yearCorrect Answer: A [1956]
Explanation:
The Neyveli Lignite Corporation, now NLC India, was set up by the Government of India in 1956.
? Full explanations with tables – General Science PYQ book (₹149): www.shanmugamiasacademy.in/study-materials/tnpsc-general-science-pyq
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Here you get the answer with a one-line explanation. TNPSC பொது அறிவு அலகு I பொது அறிவியல் முழுவதும் · 14 அத்தியாயங்கள் · 260 பயிற்சி வினாக்கள் விடையுடன் · 2 மாதிரித் தேர்வுகள் (50 வினாக்கள்) · 14 மனவரைபடங்கள் · அக்டோபர் 2026 வரையிலான அறிவியல் நடப்பு நிகழ்வுகள்
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› General Science PYQ – Computers, Technology and Scientists – Part 2 (Q 27–51)
› General Science PYQ – Computers, Technology and Scientists – Part 1 (Q 1–26)
› General Science PYQ – Scientific Temper and Scientific Method
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› General Science PYQ – Genetics, Evolution and Biotechnology – Part 1 (Q 1–26)
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