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.
| 151. |
The chemical name of lime stone is [UPPCS] |
| A. | Calcium chloride |
| B. | Calcium oxide |
| C. | Calcium carbonate |
| D. | Calcium |
| Answer» D. Calcium | |
| 152. |
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 | |
| 153. |
What is the weight of one atom of Hydrogen in grams? [NDA] |
| A. | \[6.023\text{ }\times \text{1}{{\text{0}}^{-23}}\] |
| B. | \[1.66\text{ }\times \text{1}{{\text{0}}^{-24}}\] |
| C. | \[6.62\text{ }\times \text{1}{{\text{0}}^{-24}}\] |
| D. | None of these |
| Answer» C. \[6.62\text{ }\times \text{1}{{\text{0}}^{-24}}\] | |
| 154. |
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 | |
| 155. |
What type of mixture is smoke? [CDS] |
| A. | Solid mixed with a gas |
| B. | Gas mixed with a gas |
| C. | Liquid mixed with a gas |
| D. | Gas mixed with a liquid and a solid |
| Answer» E. | |
| 156. |
Iron sheet kept in moist air covered with rust. Rust is [CDS] |
| A. | an element |
| B. | a compound |
| C. | a mixture of iron and dust |
| D. | a mixture of iron, oxygen and water |
| Answer» C. a mixture of iron and dust | |
| 157. |
Blue vitriol is [UPPCS] |
| A. | Copper sulphate |
| B. | Calcium sulphate |
| C. | Iron sulphate |
| D. | Sodium sulphate |
| Answer» B. Calcium sulphate | |
| 158. |
The number of neutrons in \[_{7}A{{I}^{27}}\] is [NDA] |
| A. | 40 |
| B. | 27 |
| C. | 14 |
| D. | 13 |
| Answer» D. 13 | |
| 159. |
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 | |
| 160. |
The latest discovered state of matter is [NDA] |
| A. | solid |
| B. | Bose-Einstein condensation |
| C. | plasma |
| D. | liquid |
| Answer» D. liquid | |
| 161. |
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 | |
| 162. |
Which one of the following is not a mixture? [CDS] |
| A. | Toot paste |
| B. | Toilet soap |
| C. | Baking soda |
| D. | Vinegar |
| Answer» D. Vinegar | |
| 163. |
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. | |
| 164. |
To weld metals together, high temperature is required. Such a high temperature is obtained by burning [NDA] |
| A. | Acetylene in oxygen |
| B. | LPG in oxygen |
| C. | Methane in oxygen |
| D. | Acetylene in nitrogen |
| Answer» B. LPG in oxygen | |
| 165. |
Which of the following is a good lubricant? [CDS] |
| A. | Diamond powder |
| B. | Graphite powder |
| C. | Molten carbon |
| D. | Alloy of carbon and iron |
| Answer» C. Molten carbon | |
| 166. |
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 | |
| 167. |
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 | |
| 168. |
The number of protons in a negatively charged atom (anion) is [NDA] |
| A. | more than the atomic number of the element |
| B. | less than the atomic number of the element |
| C. | more than the number of electrons in the atom |
| D. | less than the number of electrons in the atom |
| Answer» E. | |
| 169. |
Which one among the following is correct regarding \[{}^{20}Ne,{}^{23}N{{a}^{+}},{}^{19}{{F}^{-}}and\,\,{}^{24}M{{g}^{2+}}\]? [NDA] |
| 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 | |
| 170. |
Which one among the following transitions of electron of hydrogen atom emits radiation of the shortest wavelength? [NDA] |
| A. | n = 2 to n = 1 |
| B. | n = 3 to n = 2 |
| C. | n = 4 to n = 3 |
| D. | n = 5 to n = 4 |
| Answer» B. n = 3 to n = 2 | |
| 171. |
Match List I with List II and select the correct answer using the code given below the Lists : [NDA] List I (Scientist) List II (Discovery)A. Goldstein1.Atomic theoryB. Chadwick2.ProtonC. J.J Thomson3.NeutronD. John Dalton4.Electron |
| A. | A-2, B-3, C-4, D-1 |
| B. | A-2, B-4, C-3, D-1 |
| C. | A-1, B-4, C-3, D-2 |
| D. | A-1, B-3, C-4, D-2 |
| Answer» B. A-2, B-4, C-3, D-1 | |
| 172. |
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 \[_{6}{{C}^{14}}\] | |
| 173. |
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 | |
| 174. |
The atomic weights are expressed in terms of atomic mass unit. Which one of the following is used as a standard? [NDA] |
| A. | \[^{\text{1}}{{\text{H}}_{\text{1}}}\] |
| B. | \[^{\text{12}}{{C}_{6}}\] |
| C. | \[^{\text{16}}{{O}_{8}}\] |
| D. | \[^{35}C{{I}_{17}}\] |
| Answer» C. \[^{\text{16}}{{O}_{8}}\] | |
| 175. |
Which one of the following elements shows variable equivalent mass? [NDA] |
| A. | Zinc |
| B. | Silver |
| C. | Calcium |
| D. | Iron |
| Answer» E. | |
| 176. |
Which one of the following is used in the preparation of antiseptic solution? [CDS] |
| A. | Potassium nitrate |
| B. | Iodine |
| C. | Iodine chloride |
| D. | Potassium chloride |
| Answer» C. Iodine chloride | |
| 177. |
Aqua-regia used by alchemists to separate silver and gold is a mixture of [CDS] |
| A. | hydrochloric acid (concentrated) and nitric acid (concentrated) |
| B. | hydrochloric acid (concentrated) and sulphuric acid (concentrated) |
| C. | nitric acid (concentrated) and sulphuric acid (concentrated) |
| D. | hydrochloric acid (dilute) and sulphuric acid (dilute) |
| Answer» B. hydrochloric acid (concentrated) and sulphuric acid (concentrated) | |
| 178. |
Nail polish remover contains [CDS] |
| A. | acetone |
| B. | benzene |
| C. | formaldehyde |
| D. | acetic acid |
| Answer» B. benzene | |
| 179. |
What is the number of mole(s) of \[{{H}_{2}}\](g) required to saturate one mole benzene? [NDA] |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» D. 4 | |
| 180. |
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 | |
| 181. |
Which of the following statements regarding oxidation and reduction are correct? [NDA] 1. In oxidation, loss of electron takes place whereas in reduction, gain of electron takes place. 2. In oxidation, gain of electron takes place whereas in reduction, loss of electron takes place. 3. Oxidizing agent decreases the oxidation number but reducing agent increases the oxidation number. 4. Oxidizing agent increases the oxidation number but reducing agent reduces the oxidation number. Select the correct answer using the code given below: Code: |
| A. | 1 and 3 |
| B. | 2 and 4 |
| C. | 2 and 3 |
| D. | 1 and 4 |
| Answer» E. | |
| 182. |
Which is the symbol of the element tungsten? [NDA] |
| A. | Ta |
| B. | Tc |
| C. | W |
| D. | V |
| Answer» D. V | |
| 183. |
The following questions consist of two statements, one labelled as the Assertion [A] and the other as Reason (R), You are to examine these two statements carefully and select the answers to these items using the codes given below: [NDA] Assertion [A]: Atomic weights of most of the elements are not whole numbers. Reason (R): Atoms of most of the elements contain mixture of isotopes having different atomic weights. |
| A. | Both A and R are individually true and R is the correct explanation of A |
| B. | Both A and R are individually 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» B. Both A and R are individually true but R is NOT the correct explanation of A | |
| 184. |
On the labels of the bottles, some soft drinks are claimed to be acidity regulators. They regulate acidity using [CDS] |
| A. | carbon dioxide |
| B. | bicarbonate salts |
| C. | Both [a] and [b] |
| D. | carbon dioxide and lime |
| Answer» C. Both [a] and [b] | |
| 185. |
The chemical name of lime stone is [UPPCS] |
| A. | Calcium chloride |
| B. | Calcium oxide |
| C. | Calcium carbonate |
| D. | Calcium |
| Answer» D. Calcium | |
| 186. |
Blue vitriol is [UPPCS] |
| A. | Copper sulphate |
| B. | Calcium sulphate |
| C. | Iron sulphate |
| D. | Sodium sulphate |
| Answer» B. Calcium sulphate | |
| 187. |
The molecular formula \[{{P}_{2}}{{O}_{5}}\] means that |
| A. | a molecule contains 2 atoms of P and 5 atoms of O |
| B. | the ratio of the mass of P to the mass of O in the Molecules is 2:5 |
| C. | there are twice as many P atoms in the molecule as there are O atoms |
| D. | the ratio of the mass of P to the mass of 0 in the molecule is 5 : 2 |
| Answer» B. the ratio of the mass of P to the mass of O in the Molecules is 2:5 | |
| 188. |
What mass of hydrogen and oxygen will be produced on complete electrolysis of 18g of water? |
| A. | 2g hydrogen and 32g oxygen |
| B. | 2g hydrogen and 16g oxygen |
| C. | 4g hydrogen and 32g oxygen |
| D. | 4g hydrogen and 14g oxygen |
| Answer» C. 4g hydrogen and 32g oxygen | |
| 189. |
An oxide of nitrogen has molecular weight 30. What is the number of electrons in one molecule of the compound? [NDA] |
| A. | 14 |
| B. | 15 |
| C. | 22 |
| D. | 23 |
| Answer» D. 23 | |
| 190. |
What is the weight of one atom of Hydrogen in grams? [NDA] |
| A. | \[6.023\text{ }\times \text{1}{{\text{0}}^{-23}}\] |
| B. | \[1.66\text{ }\times \text{1}{{\text{0}}^{-24}}\] |
| C. | \[6.62\text{ }\times \text{1}{{\text{0}}^{-24}}\] |
| D. | None of these |
| Answer» C. \[6.62\text{ }\times \text{1}{{\text{0}}^{-24}}\] | |
| 191. |
The main component of Gobar gas is? [CDS] |
| A. | Chlorine |
| B. | Hydrogen |
| C. | Ethylene |
| D. | Methene |
| Answer» E. | |
| 192. |
The chemical name of 'Marsh gas' is |
| A. | Ethene |
| B. | Methane |
| C. | Propane |
| D. | Hexane |
| Answer» C. Propane | |
| 193. |
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 | |
| 194. |
When a gas is compressed keeping temperature constant, it results in |
| A. | increase in speed of gaseous molecules |
| B. | increase in collision among gaseous molecules |
| C. | decrease in speed of gaseous molecules |
| D. | decrease in collision among gaseous molecules. |
| Answer» E. | |
| 195. |
Which of the following processes is known as fusion? |
| A. | change of liquid to solid |
| B. | change of solid to liquid |
| C. | change of liquid to vapour |
| D. | change of gaseous state to solid state |
| Answer» C. change of liquid to vapour | |
| 196. |
Which of the following pairs is/are correctly matched? [NDA]1. Isotopes: Atoms with same atomic number but different atomic mass2. Isobars: Atoms with same number of neutrons but different atomic number3 Isotones: Atoms with same mass number but different atomic numberSelect the correct answer using the code given below:Code: |
| A. | 1, 2 and 3 |
| B. | 1 only |
| C. | 1 and 2 only |
| D. | 2 only |
| Answer» C. 1 and 2 only | |
| 197. |
The pH of fresh milk is 6. When it turns sour, the pH [NDA] |
| A. | becomes < 6 |
| B. | remains the same i.e., 6 |
| C. | becomes > 6 |
| D. | becomes neutral, i.e., 7 |
| Answer» B. remains the same i.e., 6 | |
| 198. |
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. | |
| 199. |
Which one of the following is not a mixture? [NDA] |
| A. | Air |
| B. | Mercury |
| C. | Milk |
| D. | Cement |
| Answer» C. Milk | |
| 200. |
What is the number of mole(s) of \[{{H}_{2}}\](g) required to saturate one mole benzene? [NDA] |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» D. 4 | |