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.
| 201. |
Column-I (Alloy) Column-II (Composition of Elements) A. Steel P. Cu and Sn B. Brass Q. Cu and Zn C. Bronze R. Fe, C and Cr D. Magnalium S. Al and Mg |
| A. | A-Q; B-R; C-P; D-S |
| B. | A-R; B-Q; C-P; D-S |
| C. | A-Q; B-R; C-S; D-P |
| D. | A-R; B-Q; C-S; D-P |
| Answer» C. A-Q; B-R; C-S; D-P | |
| 202. |
When we put some crystals of potassium permanganate in a beaker containing water, we observe that after sometime whole water has turned pink. This is due to |
| A. | boiling |
| B. | melting of potassium permanganate crystals |
| C. | sublimation of crystals |
| D. | diffusion |
| Answer» E. | |
| 203. |
At higher altitudes |
| A. | boiling point of a liquid increases |
| B. | boiling point of a liquid decreases |
| C. | no change in boiling point |
| D. | melting point of solid increases |
| Answer» C. no change in boiling point | |
| 204. |
What is the number of water molecules present in a tiny drop of water (volume 0.0018 ml) at room temperature? [NDA] |
| A. | \[4.84\times {{10}^{17}}\] |
| B. | \[4.184\times {{10}^{18}}\] |
| C. | \[6.023\times {{10}^{19}}\] |
| D. | \[6.023\times {{10}^{23}}\] |
| Answer» D. \[6.023\times {{10}^{23}}\] | |
| 205. |
The atomic weights are expressed in terms of atomic mass unit. Which one of the following is used as a standard? [NDA] |
| A. | \[^{1}{{H}_{1}}\] |
| B. | \[^{12}{{C}_{6}}\] |
| C. | \[^{16}{{O}_{8}}\] |
| D. | \[^{35}C{{I}_{17}}\] |
| Answer» C. \[^{16}{{O}_{8}}\] | |
| 206. |
The boiling point of alcohol is \[78{}^\circ C\]. What is this temperature in Kelvin scale |
| A. | 373 K |
| B. | 351 K |
| C. | 375 K |
| D. | 78 K |
| Answer» C. 375 K | |
| 207. |
Non-reacting gases have a tendency to mix with each other. This phenomenon is known as |
| A. | chemical reaction |
| B. | diffusion |
| C. | effusion |
| D. | explosion |
| Answer» C. effusion | |
| 208. |
Nail polish remover contains [CDS] |
| A. | acetone |
| B. | benzene |
| C. | formaldehyde |
| D. | acetic acid |
| Answer» B. benzene | |
| 209. |
Which one among the following is correct regarding \[{}^{20}Ne,{}^{23}N{{a}^{+}},{}^{19}{{F}^{-}}and\,\,{}^{24}M{{g}^{2+}}\]? [CDS] |
| A. | They are isomers of each other |
| B. | They are isotopes of each other |
| C. | They are isoelectronic with each other |
| D. | All of the above |
| Answer» D. All of the above | |
| 210. |
Which one among the following statements about an atom is not correct? [CDS] |
| A. | Atoms always combine to form molecules |
| B. | Atoms are the basic units from which molecules and ions are formed |
| C. | Atoms are always neutral in nature |
| D. | Atoms aggregate in large numbers to form the matter that we can see, feel and touch |
| Answer» E. | |
| 211. |
Which of the following statements is /are correct? According to Dalton's theoryA. An atom is the smallest particle of matterB. An atom is the smallest particle of an elementC. An atom is the smallest indivisible particle of an element that can take part in a chemical changeD. An atom is the radioactive emission |
| A. | A, B, and C |
| B. | B, C and D |
| C. | A, C and D |
| D. | A and D |
| Answer» B. B, C and D | |
| 212. |
Arrange the following bases in increasing order of their, basic strength [NDA]1. Sodium hydroxide2. Magnesium hydroxide3. Aluminium hydroxide4. Ammonium hydroxideSelect the correct answer using the code given below |
| A. | A-4, B-2, C-1, D-3 |
| B. | A-4, B-1, C-2, D-3 |
| C. | A-4, B-3, C-2, D-1 |
| D. | A-1, B-2, C-3, D-4 |
| Answer» D. A-1, B-2, C-3, D-4 | |
| 213. |
Which one is a sublime substance? |
| A. | Table salt |
| B. | Sugar |
| C. | Iodine |
| D. | Potassium Iodide |
| Answer» D. Potassium Iodide | |
| 214. |
Iodised salt is a [CDS] |
| A. | mixture of potassium iodide and common salt |
| B. | mixture of molecular iodide and common salt |
| C. | compound formed by combination of potassium iodide and common salt |
| D. | compound formed by molecular iodine and common salt |
| Answer» D. compound formed by molecular iodine and common salt | |
| 215. |
Statement I: Addition of water to an aqueous solution of HCl decreases the pH. [CDS] Statement II: Addition of water suppresses the ionisation of HCl. |
| 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» D. Statement I is false, but Statement II is true | |
| 216. |
Which one among the following is a double salt? [NDA] |
| A. | \[{{K}_{4}}[Fe{{(CN)}_{6}}]\] |
| B. | \[{{K}_{2}}S{{O}_{4}}.A{{l}_{2}}{{(S{{O}_{4}})}_{3}}.24{{H}_{2}}O\] |
| C. | \[CuS{{O}_{4}}.5{{H}_{2}}O\] |
| D. | \[NaCl\] |
| Answer» C. \[CuS{{O}_{4}}.5{{H}_{2}}O\] | |
| 217. |
The pH of fresh ground water slightly decreases upon exposure to air because [CDS] |
| A. | carbon dioxide from air is dissolved in the water |
| B. | oxygen from air is dissolved in the water |
| C. | the dissolved carbon dioxide of the ground water escapes into air |
| D. | the dissolved oxygen of the ground water escapes into air |
| Answer» B. oxygen from air is dissolved in the water | |
| 218. |
Vermicompost is an/a [CDS] |
| A. | inorganic fertilizer |
| B. | toxic substance |
| C. | organic bio fertilizer |
| D. | synthetic fertilizer |
| Answer» D. synthetic fertilizer | |
| 219. |
Which one among the following is a sin smelling agent added to LPG cylinder to help the detection of gas leakage? [CDS] |
| A. | Ethanol |
| B. | Thioethanol |
| C. | Methane |
| D. | Chloroform |
| Answer» C. Methane | |
| 220. |
Which one of the following is not a mixture? |
| A. | Toot paste |
| B. | Toilet soap |
| C. | Baking soda |
| D. | Vinegar |
| Answer» D. Vinegar | |
| 221. |
The latest discovered state of matter is [NDA] |
| A. | solid |
| B. | Bose-Einstein condensation |
| C. | plasma |
| D. | liquid |
| Answer» D. liquid | |
| 222. |
The chemical formula for 'laughing gas' is |
| A. | \[{{N}_{2}}O\] (Nitrous oxide) |
| B. | \[NO\] (Nitric oxide) |
| C. | \[N{{O}_{2}}\] (Nitrogen dioxide) |
| D. | \[{{N}_{2}}{{O}_{5}}\] (Nitrogen pentoxide) |
| Answer» B. \[NO\] (Nitric oxide) | |
| 223. |
The compound used as 'artificial sweetener' is |
| A. | Saccharine |
| B. | Tartaric acid |
| C. | citric acid |
| D. | octane |
| Answer» B. Tartaric acid | |
| 224. |
Neutral water with pH about 7 becomes slightly acidic when aerated. This is because [NDA] |
| A. | oxygen from air is dissolved in the water which makes the water acidic |
| B. | dirt, which get contaminated with the water during aeration makes the water acidic |
| C. | ultraviolet radiation dissociates water molecules and makes water acidic |
| D. | carbon-dioxide from air is dissolved |
| Answer» E. | |
| 225. |
The nucleus of a singly ionized carbon atom contains [NDA] |
| A. | 6 protons and 6 neutrons |
| B. | 5 protons and 6 neutrons |
| C. | 6 protons, 6 neutrons and 6 electrons |
| D. | 12 protons, 6 neutrons and 6 electrons |
| Answer» B. 5 protons and 6 neutrons | |
| 226. |
The number of neutrons in \[_{7}A{{I}^{27}}\] is [NDA] |
| A. | 40 |
| B. | 27 |
| C. | 14 |
| D. | 13 |
| Answer» D. 13 | |
| 227. |
An atom of carbon has 6 protons. Its mass number is 12. How many neutrons are present in an atom of carbon? [NDA] |
| A. | 12 |
| B. | 6 |
| C. | 10 |
| D. | 14 |
| Answer» C. 10 | |
| 228. |
Which formula gives the maximum number of electrons in a shell? |
| A. | \[{{n}^{2}}\] |
| B. | \[2{{n}^{2}}\] |
| C. | \[3{{n}^{2}}\] |
| D. | \[4{{n}^{2}}\] |
| Answer» C. \[3{{n}^{2}}\] | |
| 229. |
In which one of the following is the valence electronic configuration, \[n{{s}^{2}}n{{p}^{3}}\] found? [NDA] |
| A. | Carbon |
| B. | Oxygen |
| C. | Nitrogen |
| D. | Argon |
| Answer» D. Argon | |
| 230. |
What is anode mud? |
| A. | Fan of anode |
| B. | Metal of anode |
| C. | Impurities collected at anode in electrolysis during purification of metals |
| D. | All of these |
| Answer» D. All of these | |
| 231. |
Column-I (Product) Column-II (Name of alloy) A. Aircrafts P. Stainless steel B. Utensils Q. Bronze C. Medals R. Magnalium D. Balance beam S. Duralumin |
| A. | A-S; B-P; C-Q; D-R |
| B. | A-P; B-S; C-Q; D-R |
| C. | A-S; B-P; C-R; D-Q |
| D. | A-P; B-S; C-R; D-Q |
| Answer» B. A-P; B-S; C-Q; D-R | |
| 232. |
Which one of the following is not a mixture? [CDS] |
| A. | Toot paste |
| B. | Toilet soap |
| C. | Baking soda |
| D. | Vinegar |
| Answer» D. Vinegar | |
| 233. |
Which one of the following petroleum refinery products has the lowest boiling point? [CDS] |
| A. | Kerosene |
| B. | Diesel |
| C. | Gasoline |
| D. | Lubricating oil |
| Answer» D. Lubricating oil | |
| 234. |
List-I (Mineral) List-II Industries in which largely [CDS] A. Limestone 1. Cement B. Copper 2. Electrical goods C. Bauxite aeroplanes 3. Manufacture of D. Manganese 4. Steel |
| A. | A-3, B-4, C-1, D-2 |
| B. | A-1, B-2, C-3, D-4 |
| C. | A-3, B-2, C-1, D-4 |
| D. | A-1, B-4, C-3, D-2 |
| Answer» C. A-3, B-2, C-1, D-4 | |
| 235. |
Match List-I with List-II and select the correct answer using the codes given below the lists: [IAS Prelim] List-I List-II A. Potassium bromide 1. Fertiliser B. Potassium nitrate 2. Photography C. Potassium sulphate 3. Bakery D. Monopotassium 4. Gun powder tartarateCodes: |
| A. | A-2; B-4; C-1; D-3 |
| B. | A-2; B-3; C-1; D-4 |
| C. | A-4; B-2; C-3; D-1 |
| D. | A-4; B-2; C-1; D-3 |
| Answer» B. A-2; B-3; C-1; D-4 | |
| 236. |
Match List I with List II and select the correct answer using the codes given below the lists: [IAS Prelim] List-I List-II A. Blue vitriol 1. Sodium bicarbonate B. Epsom salt 2. Sodium hydroxide C. Baking soda 3. Magnesium sulphate D. Caustic soda 4. Copper sulphate |
| A. | A-3; B-4; C-2; D-1 |
| B. | A-4; B-3; C-2; D-1 |
| C. | A-3; B-4; C-1; D-2 |
| D. | A-4; B-3; C-1; D-2 |
| Answer» E. | |
| 237. |
Which one of the following materials is very hard and very ductile? [IAS Prelim] |
| A. | Carborundum |
| B. | Tungsten |
| C. | Cast iron |
| D. | Nichrome |
| Answer» E. | |
| 238. |
How many moles of hydrogen atom are present in one mole of Aluminium hydroxide? [NDA] |
| A. | One mole |
| B. | Two moles |
| C. | Three moles |
| D. | Four moles |
| Answer» D. Four moles | |
| 239. |
Protons and neutrons are bound in a nucleus by the [NDA] |
| A. | short range 'weak interaction' |
| B. | short range 'strong interaction' |
| C. | long range 'electromagnetic interaction' |
| D. | long range 'gravitational interaction' |
| Answer» C. long range 'electromagnetic interaction' | |
| 240. |
Statement I: Metal ions are Lewis acids. Statement II: Metal ions are electron pair acceptors. [NDA] |
| A. | Both the statements individually true and Statement II is the correct explanation of Statement I. |
| B. | Both the statements are individually true but Statement II is not 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 correct explanation of Statement I. | |
| 241. |
Which among the following statements with regard to pH scale is/are correct? [NDA] I. It is a logarithmic scale. II. The scale is limited to 0-14 because the ionic product of water is about \[{{10}^{-14}}\] III. The lower the value of pH, the greater is the acidity of the solution. Select the correct answer using the code given below |
| A. | I and II only |
| B. | I, II and III |
| C. | I and III only |
| D. | II only |
| Answer» C. I and III only | |
| 242. |
Which one among the following is not a property of salt? [NDA] |
| A. | Salts have ordered packing arrangements called lattices |
| B. | Salts have low melting points but high boiling points |
| C. | Salts are brittle |
| D. | Salts conduct electricity when dissolved in water or even in the molten state |
| Answer» C. Salts are brittle | |
| 243. |
Human stomach produces acid 'X' which helps in digestion of food. Acid 'X' is [NDA] |
| A. | acetic acid |
| B. | methanoic acid |
| C. | hydrochloric acid |
| D. | citric acid |
| Answer» D. citric acid | |
| 244. |
The concentration of hydrochloric acid in a given solution is \[{{10}^{-8}}\]M. What is the value of pH for this solution? [NDA] |
| A. | 7 |
| B. | > 7 but not 14 |
| C. | <7 |
| D. | 14 |
| Answer» D. 14 | |
| 245. |
Column-I Column-II A. Titanium P. Coinage metal B. Palladium Q. Fuel C. Uranium R. Catalyst D. Platinum S. Strategic metal |
| A. | A-S; B-R; C-Q; D-P |
| B. | A-P; B-R; C-Q; D-S |
| C. | A-R; B-S; C-Q; D-P |
| D. | A-S; B-Q; C-R; D-P |
| Answer» B. A-P; B-R; C-Q; D-S | |
| 246. |
Food cans are coated with tin and not with zinc because [CDS] |
| A. | zinc is costlier than tin. |
| B. | zinc has a higher melting point than tin. |
| C. | zinc is more reactive than tin. |
| D. | zinc is less reactive than tin. |
| Answer» D. zinc is less reactive than tin. | |
| 247. |
'Yellow cake', an item of smuggling across border is [IAS Prelim] |
| A. | a crude form of heroin |
| B. | a crude form of cocaine |
| C. | uranium oxide |
| D. | unrefined gold |
| Answer» D. unrefined gold | |
| 248. |
At NTP, the least volume will be occupied by 15 g of which one of the following? [NDA] |
| A. | \[N{{H}_{3}}\] |
| B. | \[{{O}_{2}}\] |
| C. | \[{{N}_{2}}\] |
| D. | Ne |
| Answer» D. Ne | |
| 249. |
An \[\alpha \]-particle consists of which of the following? [CDS] |
| A. | 2 protons and 2 neutrons |
| B. | 1 proton and 1 electron |
| C. | 2 protons and 4 neutrons |
| D. | 1 proton and 1 neutron |
| Answer» B. 1 proton and 1 electron | |
| 250. |
Which of the following isotopes of carbon is/are used in carbon dating? [CDS] |
| A. | \[_{6}{{C}^{12}}\] only |
| B. | \[_{6}{{C}^{13}}\] only |
| C. | \[_{6}{{C}^{14}}\] only |
| D. | \[_{6}{{C}^{12}}\] and \[_{6}{{C}^{14}}\] |
| Answer» D. \[_{6}{{C}^{12}}\] and \[_{6}{{C}^{14}}\] | |