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.
| 101. |
Which one of the following acids is used for etching glass? [NDA] |
| A. | \[{{H}_{2}}S{{O}_{4}}\] |
| B. | \[HN{{O}_{3}}\] |
| C. | \[HF\] |
| D. | \[HCl\] |
| Answer» D. \[HCl\] | |
| 102. |
Statement I: Coal-based thermal power stations contribute to acid-rain. Statement II: Oxides of carbon are emitted when coal bums. [IAS Prelim] |
| A. | Both Statement I and Statement II are individually true and Statement II is the correct explanation of Statement I |
| B. | Both Statement I and Statement II 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» C. Statement I is true but Statement II is false | |
| 103. |
The chemical used as a 'fixer' in photography is [LAS Prelim] |
| A. | Sodium sulphate |
| B. | Sodium thiosulphate |
| C. | Ammonium per sulphate |
| D. | Borax |
| Answer» E. | |
| 104. |
The polymeric fibre used as a substitute for wool in making synthetic blankets, sweaters, etc., is [CDS] |
| A. | nylon |
| B. | Teflon |
| C. | orlon |
| D. | Bakelite |
| Answer» D. Bakelite | |
| 105. |
Which one of the following polymeric materials is used for making bullet proof jacket? [CDS] |
| A. | Nylon-6, 6 |
| B. | Rayon |
| C. | Kevlar |
| D. | Dacron |
| Answer» D. Dacron | |
| 106. |
Which one of the following is used as a mordant in dyeing and tanning industry? [CDS] |
| A. | Magnesium oxide |
| B. | Magnesium carbonate |
| C. | Magnesium chloride |
| D. | Magnesium sulphate |
| Answer» B. Magnesium carbonate | |
| 107. |
Which one of the following substances is used in the manufacture of safety matches? [CDS] |
| A. | Red phosphorus |
| B. | White phosphorus |
| C. | Phosphorus trioxide (P203) |
| D. | Black phosphorus |
| Answer» B. White phosphorus | |
| 108. |
The major component used in preparation of different types of glasses is [NDA] |
| A. | Silica |
| B. | Sodium borate |
| C. | Calcium silicate |
| D. | Sodium silicate |
| Answer» B. Sodium borate | |
| 109. |
Which one of the following chemicals is used in beauty parlours for hair-setting? [NDA] |
| A. | Sulphur based |
| B. | Phosphorus based |
| C. | Silicon based |
| D. | Iron based |
| Answer» D. Iron based | |
| 110. |
Which one of the following correctly defines the state of glass? [NDA] |
| A. | Crystalline solid |
| B. | Super cooled liquid |
| C. | Condensed &as |
| D. | Liquid crystal |
| Answer» C. Condensed &as | |
| 111. |
Flint glass is obtained from which of the following? [NDA] |
| A. | Zinc and barium borosilicate |
| B. | Sand, red lead and potassium carbonate |
| C. | Sodium aluminium borosilicate? |
| D. | Pure silica and zinc oxide |
| Answer» C. Sodium aluminium borosilicate? | |
| 112. |
What is a mixture of potassium nitrate, powdered charcoal and sulphur called? [NDA] |
| A. | Glass |
| B. | Cement |
| C. | Paint |
| D. | Gun power |
| Answer» E. | |
| 113. |
What is the composition of nitrolim - a chemical fertilizer? [NDA] |
| A. | Nitrogen and limestone |
| B. | Calcium carbide and nitrogen |
| C. | Calcium carbide and carbon |
| D. | None of the above |
| Answer» E. | |
| 114. |
Which one of the following is not contained in Portland cement? [NDA] |
| A. | \[C{{a}_{3}}A{{l}_{3}}{{O}_{6}}\] |
| B. | \[C{{a}_{3}}Si{{O}_{5}}\] |
| C. | \[C{{a}_{2}}Si{{O}_{4}}\] |
| D. | \[C{{a}_{3}}{{(P{{O}_{4}})}_{2}}\] |
| Answer» E. | |
| 115. |
Which of the following is not a synthetic fibre: |
| A. | Angora |
| B. | Rayon |
| C. | Nylon |
| D. | Polyester |
| Answer» B. Rayon | |
| 116. |
Which element is more electronegative among halogens? |
| A. | Br |
| B. | CI |
| C. | F |
| D. | I |
| Answer» D. I | |
| 117. |
Which one of the following is a diagonally related pair? |
| A. | H, Be |
| B. | Na, Mg |
| C. | B, Si |
| D. | K, Ca |
| Answer» D. K, Ca | |
| 118. |
According to Newland's law of octaves, which element is the repetition of the first element in the periodic table? |
| A. | Oxygen |
| B. | Nitrogen |
| C. | Chlorine |
| D. | Sulphur |
| Answer» B. Nitrogen | |
| 119. |
A woman desires to clean the surface of her gold ornaments by a chemical approach. For this she requires to use [CDS] |
| A. | aqua-regia |
| B. | concentrated \[{{H}_{2}}S{{O}_{4}}\] |
| C. | concentrated NaOH |
| D. | sodium thiosulphate solution |
| Answer» B. concentrated \[{{H}_{2}}S{{O}_{4}}\] | |
| 120. |
Which one of the following reducing agents can also act as an oxidising agent? [CDS] |
| A. | \[{{H}_{2}}\] |
| B. | \[{{H}_{2}}S\] |
| C. | \[S{{O}_{2}}\] |
| D. | HI |
| Answer» D. HI | |
| 121. |
If a limestone piece is dipped in water, a bubble evolves. The bubbling is due to [CDS] |
| A. | hydrogen |
| B. | oxygen |
| C. | water vapour |
| D. | carbon dioxide |
| Answer» E. | |
| 122. |
Match List-I (Oxidation number) with List II (The element) and select the correct answer using the codes given below the lists : [IAS Prelim]List-I (Oxidation number)List-II (The elements)A. 2 Mn in \[Mn{{O}_{2}}\]1. Oxidation number ofB. 3 S in \[{{H}_{2}}{{S}_{2}}{{O}_{7}}\]2. Oxidation number ofC. 4 Ca in CaO3. Oxidation number ofD. 6 AI in \[NaAI{{H}_{4}}\]4. Oxidation number of |
| A. | A-3; B-4; C-1; D-2 |
| B. | A-4; B-3; C-1; D-2 |
| C. | A-3; B-4; C-2; D-1 |
| D. | A-4; B-3; C-2; D-1 |
| Answer» B. A-4; B-3; C-1; D-2 | |
| 123. |
Most of the explosions in mines occur due to the mixing of [IAS Prelim] |
| A. | hydrogen with oxygen |
| B. | oxygen with acetylene |
| C. | methane with air |
| D. | carbon dioxide with ethane |
| Answer» C. methane with air | |
| 124. |
In the reaction \[4Fe+3{{O}_{2}}\to 4F{{e}^{3+}}+6{{O}^{2-}}\] [NDA] Which of the following statements is incorrect? |
| A. | It is a redox reaction |
| B. | Metallic iron acts as a reducing agent |
| C. | \[{{O}_{2}}\]acts as an oxidising agent |
| D. | Metallic iron is reduced to \[F{{e}^{3+}}\] |
| Answer» E. | |
| 125. |
In \[KMn{{O}_{4}}\]molecule, the oxidation states of the elements Potassium (K), Manganese (Mn) and Oxygen (O) are respectively [NDA] |
| A. | +1, + 5, - 2 |
| B. | +1, + 7, - 2 |
| C. | 0, 0, 0 |
| D. | +1, + 7, 0 |
| Answer» C. 0, 0, 0 | |
| 126. |
This question consist of two statements, Statement I and Statement II. You are to examine these two statements carefully and select the answer to these items using the codes given below. [NDA] Statement I: Conversion of blue copper sulphate to black cupric oxide on heating is a physical change. Statement II: A change in which chemical composition does not change is called physical change. |
| 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» E. | |
| 127. |
Calcium carbonate is naturally available as limestone and can also be synthesized from quick lime. It is seen that the compositions of the elements in both the natural and synthetic calcium carbonate are same. The validity of which one among the following laws is confirmed by this observation? [NDA] |
| A. | Law of conservation of mass |
| B. | Law of definite proportion |
| C. | Law of multiple proportion |
| D. | Avogadro?s law |
| Answer» C. Law of multiple proportion | |
| 128. |
As compared to covalent compounds, electro valent compounds, generally have [NDA] |
| A. | low melting point and low boiling point |
| B. | low melting point and high boiling point |
| C. | high melting point and low boiling point |
| D. | high melting point and high boiling point |
| Answer» E. | |
| 129. |
Consider the following equation for the formation of ammonia from nitrogen and hydrogen: [NDA] \[{{N}_{2}}+3{{H}_{2}}=2N{{H}_{3}}\]How many hydrogen molecules are required to react with 100 molecules of nitrogen? |
| A. | 100 |
| B. | 200 |
| C. | 300 |
| D. | 400 |
| Answer» D. 400 | |
| 130. |
What are the types of bonds present in\[CuS{{O}_{4}}.5{{H}_{2}}O\]? [NDA] |
| A. | Electrovalent and covalent |
| B. | Electrovalent and coordinate covalent |
| C. | Electrovalent, covalent, coordinate covalent and hydrogen bonds |
| D. | Covalent and coordinate covalent |
| Answer» D. Covalent and coordinate covalent | |
| 131. |
An ionic compound when dissolved in water has produced \[m\,{{A}^{n-}},n\,{{B}^{m-}}\] ions. What is the formula of the compound? [NDA] |
| A. | \[{{A}_{m}}{{B}_{n}}\] |
| B. | \[{{A}_{n}}{{B}_{m}}\] |
| C. | \[{{A}_{m}}{{B}_{m}}\] |
| D. | \[{{A}_{n}}{{B}_{n}}\] |
| Answer» B. \[{{A}_{n}}{{B}_{m}}\] | |
| 132. |
Consider the following statements: [NDA]1. Maximum covalency of carbon is 4, whereas maximum covalency of silicon is 6.2. The maximum covalency of an element is limited to 6.Which of the statements given above is/are correct? |
| A. | 1 only |
| B. | 2 only |
| C. | Both 1 and 2 |
| D. | Neither 1 nor 2 |
| Answer» B. 2 only | |
| 133. |
Which one of the following when dissolved in \[{{H}_{2}}O\] gives hissing sound? [CDS] |
| A. | Limestone |
| B. | Slaked lime |
| C. | Soda lime |
| D. | Quicklime |
| Answer» E. | |
| 134. |
What is the correct increasing order of electronegativity for the most common oxidation states among the following elements? [NDA] |
| A. | F<O<N<C |
| B. | C<N<C<F |
| C. | C<N<F<O |
| D. | C<N<O<F |
| Answer» E. | |
| 135. |
Which one of the following elements is a metalloid? [NDA] |
| A. | P |
| B. | Al |
| C. | As |
| D. | Po |
| Answer» D. Po | |
| 136. |
Which one of the following is not a periodic property i.e., does not show any trend on moving from one side to the other in the periodic table? [CDS] |
| A. | Atomic size |
| B. | Valency |
| C. | Radioactivity |
| D. | Electronegativity |
| Answer» D. Electronegativity | |
| 137. |
Which element forms the highest number of compounds in the periodic table? [CDS] |
| A. | Carbon |
| B. | Oxygen |
| C. | Silicon |
| D. | Sulphur |
| Answer» B. Oxygen | |
| 138. |
The elements of a group in the periodic tabic [CDS] |
| A. | have similar chemical properties |
| B. | have consecutive atomic numbers |
| C. | are isobars |
| D. | are isotopes |
| Answer» B. have consecutive atomic numbers | |
| 139. |
Which one of the following properties changes with valency? [CDS] |
| A. | Atomic weight |
| B. | Equivalent weight |
| C. | Molecular weight |
| D. | Density |
| Answer» C. Molecular weight | |
| 140. |
The elements with atomic numbers 2, 10, 18, 36, 54 and 86 are all - |
| A. | halogens |
| B. | noble gases |
| C. | noble metals |
| D. | light metals |
| Answer» C. noble metals | |
| 141. |
Which one of these group of elements is also called the halogen family? |
| A. | Group 16 |
| B. | Group 18 |
| C. | Group 10 |
| D. | Group 17 |
| Answer» E. | |
| 142. |
Which of the following is an actinide? |
| A. | Plutonium |
| B. | Polonium |
| C. | Promethium |
| D. | Palladium |
| Answer» B. Polonium | |
| 143. |
Which among the following atoms has high atomic radi? |
| A. | Na |
| B. | Rb |
| C. | K |
| D. | Cs |
| Answer» E. | |
| 144. |
Which of the following statement is not true about noble gases? |
| A. | They are non-metallic in nature |
| B. | They exist in atomic form |
| C. | They are radioactive in nature |
| D. | Xenon is the most reactive among them |
| Answer» D. Xenon is the most reactive among them | |
| 145. |
Which of the following elements A, B, C, D and E with atomic number 3, 11, 15, 18 and 19 respectively belong to the same group? |
| A. | A, B, C |
| B. | B, C, D |
| C. | A, D, E |
| D. | A, B, E |
| Answer» E. | |
| 146. |
On moving horizontally across a period, the number of electrons in the outermost shell increases from ...... to....... |
| A. | 2, 8 |
| B. | 2, 18 |
| C. | 1, 8 |
| D. | 1, 18 |
| Answer» D. 1, 18 | |
| 147. |
Which of the following is correct set of Dobereiner Triads? |
| A. | Na, Si, CI |
| B. | Be, Mg, Ca |
| C. | F, CI, I |
| D. | Li, Na, Be |
| Answer» C. F, CI, I | |
| 148. |
The long form of periodic table consists of |
| A. | seven periods and eight groups |
| B. | seven periods and eighteen groups |
| C. | eight periods and eighteen groups |
| D. | eighteen periods and eight groups |
| Answer» C. eight periods and eighteen groups | |
| 149. |
Which one of the following is not a mixture? [NDA] |
| A. | Air |
| B. | Mercury |
| C. | Milk |
| D. | Cement |
| Answer» C. Milk | |
| 150. |
The chemical formula of plaster of parts is [BPSC] |
| A. | \[CaS{{O}_{4}}.5{{H}_{2}}O\] |
| B. | \[2CaS{{O}_{4}}.{{H}_{2}}O\] |
| C. | \[(CaS{{O}_{4}}).2{{H}_{2}}O\] |
| D. | \[COSO4.MGO\] |
| Answer» D. \[COSO4.MGO\] | |