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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.
| 51. |
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 | |
| 52. |
Which of the following has shortest carbon-carbon bond length? |
| A. | \[{{C}_{2}}{{H}_{2}}\] |
| B. | \[{{C}_{2}}{{H}_{4}}\] |
| C. | \[{{C}_{2}}{{H}_{6}}\] |
| D. | \[{{C}_{6}}{{H}_{6}}\] |
| Answer» B. \[{{C}_{2}}{{H}_{4}}\] | |
| 53. |
'Drinking alcohol' is very harmful and it ruins the health.'Drinking alcohol' stands for: |
| A. | drinking methyl alcohol |
| B. | drinking ethyl alcohol |
| C. | drinking propyl alcohol |
| D. | drinking isopropyl alcohol |
| Answer» C. drinking propyl alcohol | |
| 54. |
Which one of the following is the correct sequence in increasing order of molecular weights of the hydrocarbons? [IAS Prelim] |
| A. | Methane, ethane, propane and butane |
| B. | Propane, butane, ethane and methane |
| C. | Butane, ethane, propane and methane |
| D. | Butane, propane, ethane and methane |
| Answer» B. Propane, butane, ethane and methane | |
| 55. |
Consider the following statements about acetylene: [IAS Prelim] 1. It is used in welding industry 2. It is a raw material for preparing plastics 3. It is easily obtained by mixing silicon carbide and water of these statements |
| A. | 1 and 2 are correct |
| B. | 1 and 3 are correct |
| C. | 2 and 3 are correct |
| D. | 1, 2 and 3 are correct |
| Answer» B. 1 and 3 are correct | |
| 56. |
Which one of the following is an active component of oil of clove? [IAS Prelim] |
| A. | Menthol |
| B. | Eugenol |
| C. | Methanol |
| D. | Benzaldehyde |
| Answer» C. Methanol | |
| 57. |
The characteristic odour of garlic is due to [IAS Prelim] |
| A. | a chloro compound |
| B. | a sulphur compound |
| C. | a fluorine compound |
| D. | acetic acid |
| Answer» C. a fluorine compound | |
| 58. |
The offending substance in the liquor tragedies leading to blindness etc., is [IAS Prelim] |
| A. | ethyl alcohol |
| B. | amyl alcohol |
| C. | benzyl alcohol |
| D. | methyl alcohol |
| Answer» E. | |
| 59. |
On the basis of following features identify the correct option A. Drinks containing ethanol B. These drinks are major source of income to government |
| A. | Alcoholic beverages |
| B. | Soft drinks |
| C. | Carbonated beverages |
| D. | Rectified spirit |
| Answer» B. Soft drinks | |
| 60. |
Gas welding used for welding broken pieces of iron, we normally use a mixture of: |
| A. | ethane and oxygen |
| B. | ethene and oxygen |
| C. | ethyne and oxygen |
| D. | ethene and air |
| Answer» D. ethene and air | |
| 61. |
Column-I Column-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 | |
| 62. |
Column-I Column-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. | |
| 63. |
The main constituent of Vinegar is: [NDA] |
| A. | Acetic acid |
| B. | Ascorbic acid |
| C. | Citric acid |
| D. | Tartaric acid |
| Answer» B. Ascorbic acid | |
| 64. |
The enzyme involved in the oxidation of ethanol to form vinegar is |
| A. | zymase |
| B. | oxidase |
| C. | acetobacter |
| D. | invertase |
| Answer» D. invertase | |
| 65. |
Yellow colour of usual nitric acid is due to the presence of which one of the following? [NDA] |
| A. | \[{{N}_{2}}O\] |
| B. | NO |
| C. | \[{{N}_{2}}{{O}_{5}}\] |
| D. | \[N{{O}_{2}}\] |
| Answer» E. | |
| 66. |
Why is nitrogen molecule chemically less active? [NDA] |
| A. | It has small atomic radius |
| B. | It has high electronegativity |
| C. | It has high dissociation energy |
| D. | It has stable electronic configuration |
| Answer» D. It has stable electronic configuration | |
| 67. |
What is the colour of oxygen in solid state? [NDA] |
| A. | Pale yellow |
| B. | Pale blue |
| C. | Light green |
| D. | Greenish yellow |
| Answer» B. Pale blue | |
| 68. |
Which are the most abundant elements in the universe? [NDA] |
| A. | Oxygen and Nitrogen |
| B. | Hydrogen and Oxygen |
| C. | Hydrogen and Helium |
| D. | Carbon and Nitrogen |
| Answer» B. Hydrogen and Oxygen | |
| 69. |
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 | |
| 70. |
The form of carbon known as graphite [CDS] |
| A. | is harder than diamond |
| B. | contains a higher percentage of carbon than diamond |
| C. | is a better electrical conductor than diamond |
| D. | has equal carbon-to-carbon distances in all directions |
| Answer» D. has equal carbon-to-carbon distances in all directions | |
| 71. |
What are the elements which are liquids at room temperature and standard pressure? [CDS] 1. Helium 2. Mercury 3. Chlorine 4. Bromine Select the correct answer using the codes given below |
| A. | 2 and 3 |
| B. | 2, 3 and 4 |
| C. | 2 and 4 |
| D. | 1 and 3 |
| Answer» D. 1 and 3 | |
| 72. |
Which allotropy of carbon is in rigid three- dimensional structure? [CDS] |
| A. | Graphite |
| B. | Fullerene |
| C. | Diamond |
| D. | Carbon black |
| Answer» D. Carbon black | |
| 73. |
Which among the following elements is abundant on the lunar surface and holds the potential to put an end to the energy crisis of the earth? [CDS] |
| A. | Helium-I |
| B. | Helium-II |
| C. | Helium-III |
| D. | Helium-IV |
| Answer» D. Helium-IV | |
| 74. |
Which one of the following is the softest? [CDS] |
| A. | Sodium |
| B. | Aluminium |
| C. | Iron |
| D. | Copper |
| Answer» B. Aluminium | |
| 75. |
A glass of water does not turn into ice as it reaches \[0\text{ }{}^\circ C\]. It is because [NDA] |
| A. | water does not solidify at \[0\text{ }{}^\circ C\] |
| B. | a certain amount of heat must be supplied to the glass of water so as to solidify |
| C. | a certain amount of heat must be taken out from the glass of water so as to solidify |
| D. | water solidifies at 0 K only |
| Answer» D. water solidifies at 0 K only | |
| 76. |
Oxygen and ozone are [NDA] |
| A. | allotropes |
| B. | isomers |
| C. | isotopes |
| D. | isobars |
| Answer» B. isomers | |
| 77. |
Which of the following is an element which never exhibits positive oxidation state in any of its compounds? [NDA] |
| A. | Oxygen |
| B. | Chlorine |
| C. | Fluorine |
| D. | Carbon |
| Answer» D. Carbon | |
| 78. |
Which one of the following is the correct order in which the gases \[{{H}_{2}},Ne,{{O}_{2}}\] and \[{{N}_{2}}\]are evolved on fractional distillation of liquid air? [NDA] |
| A. | \[{{H}_{2}},Ne,{{O}_{2}},{{N}_{2}}\] |
| B. | \[{{H}_{2}},Ne,{{N}_{2}},{{O}_{2}}\] |
| C. | \[{{N}_{2}},{{O}_{2}},Ne,{{H}_{2}}\] |
| D. | \[{{O}_{2}},{{N}_{2}},{{H}_{2}},Ne\] |
| Answer» C. \[{{N}_{2}},{{O}_{2}},Ne,{{H}_{2}}\] | |
| 79. |
Which of the following is not a nitrogenous fertilizer? [NDA] |
| A. | \[Ca{{(CN)}_{2}}\] |
| B. | \[CaC{{N}_{2}}\] |
| C. | \[N{{H}_{4}}N{{O}_{3}}\] |
| D. | Urea |
| Answer» B. \[CaC{{N}_{2}}\] | |
| 80. |
Which one of the following elements cannot displace hydrogen gas from a dilute acid? [NDA] |
| A. | Zinc |
| B. | Copper |
| C. | Magnesium |
| D. | Iron |
| Answer» C. Magnesium | |
| 81. |
Which of the following reacts with cold water vigorously? |
| A. | carbon |
| B. | sodium |
| C. | magnesium |
| D. | sulphur |
| Answer» C. magnesium | |
| 82. |
What is the purpose of adding plasticizers in paint manufacturing process? [NDA] |
| A. | They act as a film-forming constituent |
| B. | They reduce the viscosity |
| C. | They prevent the polymerization and condensation |
| D. | They provide elasticity to the film and minimize its cracking |
| Answer» E. | |
| 83. |
From which one among the following water sources, the water is likely to be contaminated with fluoride? [CDS] |
| A. | Ground water |
| B. | River water |
| C. | Pond water |
| D. | Rainwater |
| Answer» C. Pond water | |
| 84. |
Some statements about the benefits of organic farming are given below. Indicate whether they are true or false using the codes given below the statements : [CDS] 1. It reduces \[C{{O}_{2}}\] emission. 2. It does not lead to toxic effect. 3. It improves the water-retention capacity of the soil. Codes |
| A. | \[_{False}^{\,\,\,\,\,\,1}\] \[_{True}^{\,\,\,\,\,\,2}\] \[_{False}^{\,\,\,\,\,\,3}\] |
| B. | \[_{True}^{\,\,\,\,\,\,1}\] \[_{False}^{\,\,\,\,\,\,2}\] \[_{False}^{\,\,\,\,\,\,3}\] |
| C. | \[_{False}^{\,\,\,\,\,\,1}\] \[_{True}^{\,\,\,\,\,\,2}\] \[_{True}^{\,\,\,\,\,\,3}\] |
| D. | \[_{False}^{\,\,\,\,\,\,1}\] \[_{True}^{\,\,\,\,\,\,2}\] \[_{True}^{\,\,\,\,\,\,3}\] |
| Answer» D. \[_{False}^{\,\,\,\,\,\,1}\] \[_{True}^{\,\,\,\,\,\,2}\] \[_{True}^{\,\,\,\,\,\,3}\] | |
| 85. |
Which one of the following is associated with the formation of brown air in traffic congested cities? [CDS] |
| A. | Sulphur dioxide |
| B. | Nitrogen oxide |
| C. | Carbon dioxide |
| D. | Carbon monoxide |
| Answer» C. Carbon dioxide | |
| 86. |
Which of the following best describes "jet streams"? |
| A. | Wind system with seas and reversal of direction. |
| B. | Wind blowing from sub-tropical high pressure belts towards the tropical low pressure belts. |
| C. | Narrow meandering bands of winds which blow in mid latitude near the tropopause and encircle the globe. |
| D. | Winds blowing from the tropical high pressure belts towards the equatorial low pressure belts. |
| Answer» D. Winds blowing from the tropical high pressure belts towards the equatorial low pressure belts. | |
| 87. |
The layer which reflects radio signals back to earth is - |
| A. | Ozone layer |
| B. | Troposphere |
| C. | Ionosphere |
| D. | Stratosphere |
| Answer» B. Troposphere | |
| 88. |
Chipko movement is concerned with - |
| A. | plant conservation |
| B. | project tiger |
| C. | plant breeding |
| D. | animal breeding |
| Answer» B. project tiger | |
| 89. |
Ozone layer in upper atmosphere (stratosphere) is destroyed by - |
| A. | hydrochloric acid |
| B. | photochemical smog |
| C. | chlorofluoro carbon (CFC) |
| D. | sulphur dioxide |
| Answer» D. sulphur dioxide | |
| 90. |
What is the reason for white cement to be white? [NDA] |
| A. | It does not contain carbon |
| B. | It does not contain silicon |
| C. | It does not contain iron |
| D. | It does not contain calcium |
| Answer» D. It does not contain calcium | |
| 91. |
DDT is a - |
| A. | non-biodegradable pollutant |
| B. | biodegradable pollutant |
| C. | antibiotics |
| D. | none of the above |
| Answer» B. biodegradable pollutant | |
| 92. |
Which of the following gas causes pollution - |
| A. | CO |
| B. | \[S{{O}_{2}}\] |
| C. | Both [a] and [b] |
| D. | None of the above |
| Answer» D. None of the above | |
| 93. |
Which of the following is a measure of organic pollution of water - |
| A. | DO |
| B. | BOD |
| C. | COD |
| D. | All of these |
| Answer» E. | |
| 94. |
\[C{{O}_{2}}\] absorbs some of the ............. that radiates from the surface of Earth to space - |
| A. | ozone |
| B. | heat |
| C. | ultraviolet light |
| D. | smog |
| Answer» C. ultraviolet light | |
| 95. |
It is said, the Taj Mahal may be destroyed due to |
| A. | flood in Yamuna river |
| B. | decomposition of marble as a result of high temperature |
| C. | air pollutants released from oil refinery of Mathura |
| D. | all the above |
| Answer» D. all the above | |
| 96. |
Which one of the following is used as an explosive? [IAS Prelim] |
| A. | Phosphorus trichloride |
| B. | Mercuric oxide |
| C. | Graphite |
| D. | Nitro-glycerine |
| Answer» E. | |
| 97. |
Which one of the following is another name of RDX? [IAS Prelim] |
| A. | Cyanohydrin |
| B. | Dextran |
| C. | Cyclohexane |
| D. | Cyclonite |
| Answer» E. | |
| 98. |
Consider the following chemicals: [IAS Prelim] 1. Benzene 2. Carbon tetrachloride 3. Sodium carbonate 4. Trichloroethylene Which of the above/is are used as dry cleaning chemical? |
| A. | 1 only |
| B. | 2 only |
| C. | 1, 2 and 4 only |
| D. | 1, 2, 3 and 4 |
| Answer» D. 1, 2, 3 and 4 | |
| 99. |
Statement I: Phenyl is used as a household germicide. Statement II: Phenyl is phenol derivative and phenol is an effective germicide. [IAS Prelim] |
| A. | Both Statement I and Statement II are true and Statement II is the correct explanation of Statement I |
| B. | Both Statement I and Statement II are 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 Statement I and Statement II are true but Statement II is NOT the correct explanation of Statement I | |
| 100. |
Salts of which of the following elements provide colours to fireworks? [IAS Prelim] |
| A. | Zinc and sulphur |
| B. | Potassium and mercury |
| C. | Strontium and barium |
| D. | Chromium and nickel |
| Answer» D. Chromium and nickel | |