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MCQOPTIONS
This section includes 2539 Mcqs, each offering curated multiple-choice questions to sharpen your Current Affairs knowledge and support exam preparation. Choose a topic below to get started.
| 2151. |
The maximum number of isomers for an alkene with molecular formula C4H8 is |
| A. | 5 |
| B. | 4 |
| C. | 2 |
| D. | 3 |
| Answer» C. 2 | |
| 2152. |
The most electropositive elements among the following is |
| A. | Na |
| B. | Ca |
| C. | K |
| D. | Cs |
| Answer» E. | |
| 2153. |
The oil used in the froth floatation process is |
| A. | coconut oil |
| B. | olive oil |
| C. | kerosene oil |
| D. | pine oil |
| Answer» E. | |
| 2154. |
The heat energy produced when the human body metabolises 1 gram of fat is |
| A. | 30 KJ |
| B. | 1 KJ |
| C. | 39 KJ |
| D. | 29 KJ |
| Answer» D. 29 KJ | |
| 2155. |
The high reactivity of fluorine is due to |
| A. | its high electro negativity |
| B. | small size of fluorine atom |
| C. | availability of d-orbitals |
| D. | strong F - F bond |
| Answer» B. small size of fluorine atom | |
| 2156. |
The iron ore magnetite consists of |
| A. | Fe2O3 |
| B. | Fe3OH4 |
| C. | FeCO3 |
| D. | 3Fe2O3 .. 3H2O |
| Answer» B. Fe3OH4 | |
| 2157. |
The mass number of an atom is equal to |
| A. | the number of protons |
| B. | the number of protons and electrons |
| C. | the number of nucleons |
| D. | the number of neutrons |
| Answer» D. the number of neutrons | |
| 2158. |
The metal that is used as a catalyst in the hydrogenation of oils is |
| A. | Ni |
| B. | Pb |
| C. | Cu |
| D. | Pt |
| Answer» B. Pb | |
| 2159. |
The hardest form of carbon is |
| A. | coke |
| B. | graphite |
| C. | diamond |
| D. | charcoal |
| Answer» D. charcoal | |
| 2160. |
The ionisation energy of hydrogen atom in the ground state is x KJ. The energy required for an electron to jump from 2nd orbit to 3rd orbit is |
| A. | 5x/36 |
| B. | 5x |
| C. | 7.2 x |
| D. | x/6 |
| Answer» B. 5x | |
| 2161. |
The inert gases are ____ in water |
| A. | sparingly soluble |
| B. | insoluble |
| C. | soluble |
| D. | None of these |
| Answer» B. insoluble | |
| 2162. |
The gas used for artificial ripening of green fruit is |
| A. | ethylene |
| B. | ethane |
| C. | carbon dioxide |
| D. | acetylene |
| Answer» B. ethane | |
| 2163. |
The main use of salt in the diet is to |
| A. | make the taste of food better |
| B. | produce in small amounts the hydrochloric acid required for the digestion of food |
| C. | ease the process of cooking |
| D. | increase the solubility of food particles in water |
| Answer» C. ease the process of cooking | |
| 2164. |
The ionic radii of N3-, O2-, F- and Na+ follows the order |
| A. | N3- > O2- > F- > Na+ |
| B. | N3- > Na+ > O2- > F- |
| C. | Na+ > O2- > N3- > F- |
| D. | O2- > F- > Na+ > N3- |
| Answer» B. N3- > Na+ > O2- > F- | |
| 2165. |
The number of water molecules present in a drop of water (volume 0.0018 ml) at room temperature is |
| A. | 1.568 x 103 |
| B. | 6.023 x 1019 |
| C. | 4.84 x 1017 |
| D. | 6.023 x 1023 |
| Answer» C. 4.84 x 1017 | |
| 2166. |
The major constituent of air is |
| A. | nitrogen |
| B. | carbon dioxide |
| C. | oxygen |
| D. | hydrogen |
| Answer» B. carbon dioxide | |
| 2167. |
The most abundant rare gas in the atmosphere is |
| A. | He |
| B. | Ne |
| C. | Ar |
| D. | Xe |
| Answer» D. Xe | |
| 2168. |
The half life period of an isotope is 2 hours. After 6 hours what fraction of the initial quantity of the isotope will be left behind? |
| A. | 1/6 |
| B. | 1/3 |
| C. | 1/8 |
| D. | 1/4 |
| Answer» D. 1/4 | |
| 2169. |
The inexpensive and commonly used variety of glass is called soda glass. It is called so because |
| A. | was used initially for making bottles of soda(carbonated drink) |
| B. | is made using soda(sodium carbonate) |
| C. | was initially used for storing sodium carbonate |
| D. | is made using soda lime |
| Answer» C. was initially used for storing sodium carbonate | |
| 2170. |
The luster of a metal is due to |
| A. | its high density |
| B. | its high polishing |
| C. | its chemical inertness |
| D. | presence of free electrons |
| Answer» E. | |
| 2171. |
The gas used in the manufacture of vanaspati from vegetable oil is |
| A. | hydrogen |
| B. | oxygen |
| C. | nitrogen |
| D. | carbon dioxide |
| Answer» B. oxygen | |
| 2172. |
The hottest part of the gas flame is known as |
| A. | luminous zone |
| B. | dark zone |
| C. | blue zone |
| D. | non-luminous zone |
| Answer» E. | |
| 2173. |
The first metal used by man was |
| A. | iron |
| B. | copper |
| C. | gold |
| D. | bronze |
| Answer» C. gold | |
| 2174. |
The number of waves made by an electron moving in an orbit having maximum magnetic quantum number is +3 |
| A. | 4 |
| B. | 5 |
| C. | 2 |
| D. | zero |
| Answer» B. 5 | |
| 2175. |
The mass of one Avogadro number of helium atom is |
| A. | 1.00 gram |
| B. | 4.00 gram |
| C. | 8.00 gram |
| D. | 4 x 6.02 x 1023 gram |
| Answer» C. 8.00 gram | |
| 2176. |
The items amenable to detection by soft x-rays are |
| A. | contrabands |
| B. | lead in bullets |
| C. | narcotics |
| D. | genuine coins from counterfeit coins |
| Answer» E. | |
| 2177. |
The metal does not give H2 on treatment with dilute HCL is |
| A. | Zn |
| B. | Fe |
| C. | Ag |
| D. | Ca |
| Answer» D. Ca | |
| 2178. |
What are the number of moles of CO2 which contains 16 g of oxygen? |
| A. | 0.5 mole |
| B. | 0.2 mole |
| C. | 0.4 mole |
| D. | 0.25 mole |
| Answer» B. 0.2 mole | |
| 2179. |
The monomer of polythene is |
| A. | vinyl chloride |
| B. | ethylene |
| C. | ethyl alcohol |
| D. | None of the above |
| Answer» C. ethyl alcohol | |
| 2180. |
The most extensive, commercially useful source of thorium as monazite sand occurs in India at |
| A. | Orissa coast |
| B. | Travancore coast |
| C. | West Bengal coast |
| D. | Gujarat coast |
| Answer» C. West Bengal coast | |
| 2181. |
The most malleable metal is |
| A. | platinum |
| B. | silver |
| C. | iron |
| D. | gold |
| Answer» E. | |
| 2182. |
The hydronium ion is |
| A. | H+ |
| B. | HO - |
| C. | H2+ |
| D. | H3O+ |
| Answer» E. | |
| 2183. |
The number of electrons presents in H+ is |
| A. | zero |
| B. | one |
| C. | two |
| D. | three |
| Answer» B. one | |
| 2184. |
The main chemical constituent of clay is |
| A. | silicon oxide |
| B. | aluminium borosilicate |
| C. | zeolites |
| D. | aluminium silicate |
| Answer» E. | |
| 2185. |
The method that cannot be used for removing permanent hardness of water is |
| A. | adding sodium carbonate |
| B. | distillation |
| C. | adding caustic soda |
| D. | boiling |
| Answer» E. | |
| 2186. |
The human body is made up of several chemical elements; the element present in the highest proportion (65%) in the body is |
| A. | carbon |
| B. | hydrogen |
| C. | oxygen |
| D. | nitrogen |
| Answer» D. nitrogen | |
| 2187. |
The number of waves in n x 10th Bohr's orbit are |
| A. | n2 |
| B. | n |
| C. | n-2 |
| D. | n3 |
| Answer» C. n-2 | |
| 2188. |
The following are the half lives of four active isotopes. Which one of the following is the most dangerous to handle? |
| A. | 3 billion years |
| B. | 100 years |
| C. | 0.01 minute |
| D. | 13 days |
| Answer» D. 13 days | |
| 2189. |
The molecular formula of phosphorous is |
| A. | P1 |
| B. | P2 |
| C. | P3 |
| D. | P4 |
| Answer» E. | |
| 2190. |
The number of atoms present in 21.6 gram of silver (atomic weight = 108) are same as the molecules in |
| A. | 1.8 gram of H2O |
| B. | 12 moles of KMnO4 |
| C. | 0.6N H2SO4 |
| D. | 4.6 gram of C2H5OH |
| Answer» C. 0.6N H2SO4 | |
| 2191. |
The molecule which has the highest percentage of ionic character among the following is |
| A. | HI |
| B. | HF |
| C. | HCI |
| D. | HBr |
| Answer» C. HCI | |
| 2192. |
The organic reaction represented by equation CH3 - CH = O + H2NOH gives CH3 - CH - NH + H2O is an example of |
| A. | an addition reaction |
| B. | a condensation reaction |
| C. | an oxidation reaction |
| D. | an elimination reaction |
| Answer» C. an oxidation reaction | |
| 2193. |
The mass number of a nucleus is |
| A. | always less than its atomic number |
| B. | the sum of the number of protons and neutrons present in the nucleus |
| C. | always more than the atomic weight |
| D. | a fraction |
| Answer» C. always more than the atomic weight | |
| 2194. |
The graphite rods in the nuclear reactor |
| A. | react with U to release energy |
| B. | produce neutrons |
| C. | undergo combustion which triggers the nuclear fission |
| D. | convert fast moving neutrons into thermal neutrons |
| Answer» E. | |
| 2195. |
The metal that is usually extracted from sea water is |
| A. | Ca |
| B. | Na |
| C. | K |
| D. | Mg |
| Answer» E. | |
| 2196. |
The formula C6H5-CO-CH3 represents |
| A. | Acetone |
| B. | Acetic acid |
| C. | Acetophenone |
| D. | Phenyl acetate |
| Answer» D. Phenyl acetate | |
| 2197. |
The isomerism which exists between CH3CHCI2 and CH2CI. CH2CI is |
| A. | chain isomerism |
| B. | functional group isomerism |
| C. | positional isomerism |
| D. | metamerism |
| Answer» D. metamerism | |
| 2198. |
The ore which is found in abundance in India is |
| A. | monazite |
| B. | fluorspar |
| C. | bauxite |
| D. | magnetite |
| Answer» B. fluorspar | |
| 2199. |
The mineral containing both magnesium and calcium is |
| A. | magnesite |
| B. | calcite |
| C. | carnallite |
| D. | dolomite |
| Answer» E. | |
| 2200. |
For yet undiscovered elements Periodic table has |
| A. | columns |
| B. | groups |
| C. | rows |
| D. | gaps |
| Answer» E. | |