MCQOPTIONS
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MCQOPTIONS
This section includes 351 Mcqs, each offering curated multiple-choice questions to sharpen your UPSC IAS Exam knowledge and support exam preparation. Choose a topic below to get started.
| 301. |
What is the term used to denote the critical temperature at which the air becomes saturated with vapour and below which the condensation is likely to begin? [NDA] |
| A. | Condensation point |
| B. | Evaporation point |
| C. | Dew point |
| D. | Point of critical temperature |
| Answer» D. Point of critical temperature | |
| 302. |
The process used to separate oil and water is |
| A. | distillation |
| B. | sublimation |
| C. | separating funnel |
| D. | chromatography |
| Answer» D. chromatography | |
| 303. |
Kerosene is a mixture of |
| A. | aromatic hydrocarbons |
| B. | aliphatic hydrocarbons |
| C. | saturated hydrocarbons |
| D. | alicyclic hydrocarbons |
| Answer» C. saturated hydrocarbons | |
| 304. |
A pungent smell often present near the urinals is due to |
| A. | sulphur-di-oxide |
| B. | chlorine |
| C. | ammonia |
| D. | urea |
| Answer» D. urea | |
| 305. |
The phenomenon of radioactivity was invented by |
| A. | Maril Curie |
| B. | Pierre Curie |
| C. | Henry Bacquerel |
| D. | J.J Thompson |
| Answer» D. J.J Thompson | |
| 306. |
Match the following columns? [NDA] Column I (Fuel Gas) Column II (Major constituent)A.CNG1.Carbon monoxide, hydrogenB.Coal gas2.Butane, propeneC.LPG3.Methane, ethaneD.Water gas4.Hydrogen, methane, carbon monoxide |
| A. | A-2, B-1, C-3, D-4 |
| B. | A-2, B-4, C-3, D-1 |
| C. | A-3, B-4, C-2, D-1 |
| D. | A-3, B-1, C-2, D-4 |
| Answer» D. A-3, B-1, C-2, D-4 | |
| 307. |
Which chemical was an important symbol in our freedom struggle? [CDS] |
| A. | Glucose |
| B. | Fertilizer |
| C. | Medicine |
| D. | Sodium chloride |
| Answer» C. Medicine | |
| 308. |
Which chemical was an important symbol in our freedom struggle? [CDS] |
| A. | Glucose |
| B. | Fertilizer |
| C. | Medicine |
| D. | Sodium chloride |
| Answer» C. Medicine | |
| 309. |
The main of component of Biogas is |
| A. | Methane |
| B. | Ethane |
| C. | Propane |
| D. | Butane |
| Answer» B. Ethane | |
| 310. |
The main component of Gobar gas is? [CDS] |
| A. | Chlorine |
| B. | Hydrogen |
| C. | Ethylene |
| D. | Methene |
| Answer» E. | |
| 311. |
The chemical technique applied to find out age of fossils is knows as |
| A. | Carbon dating |
| B. | Nuclear fusion |
| C. | Photosynthesis |
| D. | Fermentation |
| Answer» B. Nuclear fusion | |
| 312. |
Match the followingA.Azidothymidine1.AntibioticB.cis-Platin and taxol2.Drugs for AIDS patientC.Streptomycin3.Drugs for treating cancer patientsD.Paracetamol4.Antipyretic |
| A. | A-2, B-3, C-1, D-4 |
| B. | A-1, B-2, C-4, D-3 |
| C. | A-4, B-2, C-3, D-1 |
| D. | A-1, B-2, C-3, D-4 |
| Answer» B. A-1, B-2, C-4, D-3 | |
| 313. |
Which one among the following is not a mixture? |
| A. | Graphite |
| B. | Glass |
| C. | Brass |
| D. | Steel |
| Answer» B. Glass | |
| 314. |
Which one among the following statements regarding the properties of mixtures and compounds is not correct? [NDA] |
| A. | A mixture shows the properties of its constituents but the properties of a compound are entirely different from its constituents |
| B. | A mixture may be homogeneous or heterogeneous but a compound is a homogeneous substance |
| C. | The constituents of a mixture can be separated by physical methods but those of a compound cannot be separated by physical methods |
| D. | Energy is either absorbed or evolved during the preparation of a mixture but not in the preparation of a compound |
| Answer» E. | |
| 315. |
Which one of the following is not a mixture? [NDA] |
| A. | Air |
| B. | Mercury |
| C. | Milk |
| D. | Cement |
| Answer» C. Milk | |
| 316. |
Column-IColumn-IIA.PolyethyleneP.wood glueB.Cellulose acetateQ.Soft drinksC.Polyvinyl acetateR.Descaling agentsD.Dil Acetic acidS.Photographic film. |
| A. | A-Q; B-S; C-P; D-R |
| B. | A-S; B-Q; C-P; D-R |
| C. | A-Q; B-S; C-R; D-P |
| D. | A-S; B-Q; C-R; D-P |
| Answer» B. A-S; B-Q; C-P; D-R | |
| 317. |
Column-IColumn-IIA.Carbon blackP.Water filters.B.DiamondQ.FuelC.CokeR.JewelleryD.CharcoalS.Filler in automobiles |
| A. | A-Q; B-R; C-S; D-P |
| B. | A-P; B-Q; C-Q; D-S |
| C. | A-S; B-R; C-P; D-Q |
| D. | A-S; B-R; C-Q; D-P |
| Answer» E. | |
| 318. |
Which of the following can be used distinguish between ethane and ethene? |
| A. | A lighted splinter |
| B. | Aqueous bromine |
| C. | Litmus solution |
| D. | Lime water |
| Answer» C. Litmus solution | |
| 319. |
Mineral acids are stronger acids than carboxylic acids because A. mineral acids are completely ionised B. carboxylic acids are completely ionised C. mineral acids are partially ionised D. carboxylic acids are partially ionised |
| A. | A and D |
| B. | B and C |
| C. | A and B |
| D. | C and D |
| Answer» B. B and C | |
| 320. |
Identify the enzyme which converts glucose to ethyl alcohol. |
| A. | Zymase |
| B. | Invertase |
| C. | Maltase |
| D. | Diastase |
| Answer» B. Invertase | |
| 321. |
Soaps are sodium salts of fatty acids. Which of the following tatty acid does not form soap? |
| A. | Butyric acid |
| B. | Oleic acid |
| C. | Palmitic acid |
| D. | Stearic acid |
| Answer» B. Oleic acid | |
| 322. |
A bee-sting leaves an acid which causes pain and irritation. The injected acid is [NDA] |
| A. | acetic acid |
| B. | sulphuric acid |
| C. | citric acid |
| D. | methanoic acid |
| Answer» E. | |
| 323. |
Assertion [A]: The main constituent of the liquefied petroleum gas is methane.Reason [R]: Methane can be used directly for burning in homes and factories where it can be supplied through pipelines. [IAS Prelim] |
| A. | Both A and R are true and R is the correct explanation of A |
| B. | Both A and R are true but R is not the correct explanation of A |
| C. | A is true but R is false |
| D. | A is false but R is true |
| Answer» E. | |
| 324. |
Addition of ethylene dibromide to petrol [CDS] |
| A. | increases the octane number of fuel |
| B. | helps elimination of lead oxide |
| C. | removes the sulphur compound in petrol |
| D. | serves as a substitute of tetraethyl lead |
| Answer» E. | |
| 325. |
Which of the following has maximum density [CDS] |
| A. | Chloroform |
| B. | Water |
| C. | Benzene |
| D. | Ice |
| Answer» C. Benzene | |
| 326. |
The flavour of apple is mainly due to which one of the following? [CDS] |
| A. | Formalin |
| B. | Benzene |
| C. | Ethanol |
| D. | Benzaldehyde |
| Answer» D. Benzaldehyde | |
| 327. |
Which of the following are the constituents of matter? A. Atoms B. Molecules C. Solid |
| A. | A and B only |
| B. | A and C only |
| C. | B and C only |
| D. | A, B and C |
| Answer» B. A and C only | |
| 328. |
Valency of Cr in \[CrP{{O}_{4}}\] is |
| A. | 4 |
| B. | 3 |
| C. | 2 |
| D. | 1 |
| Answer» C. 2 | |
| 329. |
Which of the following metals on reacting with sodium hydroxide solution produce hydrogen gas? A. Cu B. Al C. Fe D. Zn |
| A. | B and C |
| B. | A and D |
| C. | B and D |
| D. | B only |
| Answer» C. B and D | |
| 330. |
A non-metal that catches fire at room temperature is- |
| A. | Sodium |
| B. | Sulphur |
| C. | Phosphorus |
| D. | Fluorine |
| Answer» D. Fluorine | |
| 331. |
Which of the following non-metals has shining lustrous surfaces? |
| A. | Graphite and phosphorus |
| B. | Graphite and iodine |
| C. | Iodine and phosphorus |
| D. | Phosphorus and chlorine |
| Answer» C. Iodine and phosphorus | |
| 332. |
Statement I: Soaps do not form lather with water containing salts of calcium and magnesium. Statement II: Calcium and magnesium salts of long chain fatty acids are insoluble in water. |
| A. | Both the statements are individually true and Statement II is the correct explanation of Statement I. |
| B. | Both the statements are individually true but Statement II is not the correct explanation of Statement I. |
| C. | Statement I is true, but Statement II is false. |
| D. | Statement I is false, but Statement II is true. |
| Answer» B. Both the statements are individually true but Statement II is not the correct explanation of Statement I. | |
| 333. |
Which one of the following is also called Stranger Gas? [IAS Prelim] |
| A. | Argon |
| B. | Neon |
| C. | Xenon |
| D. | Nitrous oxide |
| Answer» D. Nitrous oxide | |
| 334. |
Which one of the following is the secondary source of light in a fluorescent lamp? [CDS] |
| A. | Neon gas |
| B. | Argon gas |
| C. | Mercury vapour |
| D. | Fluorescent coating |
| Answer» E. | |
| 335. |
Deionised water is produced by [NDA] |
| A. | Calgon process |
| B. | Ion-exchange resin process |
| C. | Clark's process |
| D. | Permutit process |
| Answer» C. Clark's process | |
| 336. |
Which one among the following does not have an allotrope? [NDA] |
| A. | Oxygen |
| B. | Sulphur |
| C. | Nitrogen |
| D. | Carbon |
| Answer» D. Carbon | |
| 337. |
Which raw material is used in the preparation of soft glass? [NDA] |
| A. | \[{{K}_{2}}C{{O}_{3}},Si{{o}_{2}},CaC{{O}_{3}}\] |
| B. | \[{{K}_{2}}C{{O}_{3}},Si{{O}_{2}},PbC{{O}_{3}}\] |
| C. | \[N{{a}_{2}}C{{O}_{3}},Si{{O}_{2}},CaC{{O}_{3}}\] |
| D. | \[N{{a}_{2}}C{{O}_{3}},Si{{O}_{2}},PbO\] |
| Answer» D. \[N{{a}_{2}}C{{O}_{3}},Si{{O}_{2}},PbO\] | |
| 338. |
Which fertilizer is assimilated directly by the plant? [NDA] |
| A. | Super phosphate |
| B. | Nitrolim |
| C. | Muriate of Potash |
| D. | Humus |
| Answer» D. Humus | |
| 339. |
Which of the following chemicals is used in foam fire extinguishers? [NDA] |
| A. | Aluminium sulphate |
| B. | Copper sulphate |
| C. | Cobalt sulphate |
| D. | Nickel sulphate |
| Answer» B. Copper sulphate | |
| 340. |
Minimata disease is a pollution-related disease, which results from - |
| A. | release of human organic waste into drinking water |
| B. | release of industrial waste mercury into fishing water |
| C. | accumulation of arsenic into atmosphere |
| D. | oil spills into sea |
| Answer» C. accumulation of arsenic into atmosphere | |
| 341. |
A green house |
| A. | is an enclosure of glass in which plants are kept to protect them from cold air outside |
| B. | is that "body" which allows the short wavelength incoming solar radiation to enter in, but does not allow long wavelength outgoing infra-red radiations to escape out |
| C. | both the above |
| D. | none of the above |
| Answer» D. none of the above | |
| 342. |
Which of the following is the major cause of global warming? |
| A. | Re-radiation of U.V. rays by \[C{{O}_{2}}\] and \[{{H}_{2}}O\] |
| B. | Re-radiation of I.R. rays by \[C{{O}_{2}}\] and \[{{H}_{2}}O\] |
| C. | Re-radiation of I.R. rays by \[{{O}_{2}}\] and \[{{N}_{2}}\] |
| D. | Re-radiation of U.V. rays by \[{{O}_{2}}\] and \[{{N}_{2}}\] |
| Answer» C. Re-radiation of I.R. rays by \[{{O}_{2}}\] and \[{{N}_{2}}\] | |
| 343. |
On the basis of following features identify correct optionA. Gaps were left for undiscovered elementsB. No correct position of hydrogenC. The isotopes of same element will be given different position |
| A. | Mendeleev's periodic table |
| B. | Modem periodic table |
| C. | Newland's arrangement of elements |
| D. | Both [a] and [b] |
| Answer» B. Modem periodic table | |
| 344. |
Which of the following is not isoelectronic with \[{{O}^{2-}}\]? |
| A. | \[{{N}^{3-}}\] |
| B. | \[N{{a}^{+}}\] |
| C. | \[{{F}^{-}}\] |
| D. | \[T{{i}^{+}}\] |
| Answer» E. | |
| 345. |
Which one of the following is most electropositive element? |
| A. | Sodium |
| B. | Calcium |
| C. | Aluminium |
| D. | Silicon |
| Answer» B. Calcium | |
| 346. |
Consider the following statements with reference to the periodic table of chemical elements: [IAS Prelim] 1. Ionisation potential gradually decreases along a period 2. In a group of elements, electron affinity decreases as the atomic weight increases 3. In a given period, electronegativity decreases as the atomic number increases Which of these statement (s) is/are correct? |
| A. | 1 only |
| B. | 2 only |
| C. | 1 and 3 |
| D. | 2 and 3 |
| Answer» C. 1 and 3 | |
| 347. |
The rusting of iron nail [CDS] |
| A. | decreases its weight |
| B. | increases its weight |
| C. | does not affect weight but iron is oxidised |
| D. | does not affect weight but iron is reduced |
| Answer» C. does not affect weight but iron is oxidised | |
| 348. |
The octet rule is not valid for which one of the following molecules? [NDA] |
| A. | \[C{{O}_{2}}\] |
| B. | \[{{H}_{2}}S\] |
| C. | \[N{{H}_{3}}\] |
| D. | \[B{{F}_{3}}\] |
| Answer» E. | |
| 349. |
Antacids are commonly used to get rid of acidity in the stomach. A commonly used antacid is [CDS] |
| A. | sodium hydrogen phthalate |
| B. | magnesium hydroxide |
| C. | calcium hydroxide |
| D. | manganese acetate |
| Answer» C. calcium hydroxide | |
| 350. |
The acid in gastric juice is [NDA] |
| A. | acetic acid |
| B. | nitric acid |
| C. | hydrochloric acid |
| D. | sulphuric acid |
| Answer» D. sulphuric acid | |