MCQOPTIONS
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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.
| 1301. |
How many atoms are present in a (NH4)2SO4 molecule? |
| A. | 15 |
| B. | 14 |
| C. | 12 |
| D. | 13 |
| Answer» B. 14 | |
| 1302. |
In Modern Periodic Table, while moving left to right across a period, the metallic character ______. |
| A. | increases |
| B. | decreases |
| C. | remain same |
| D. | first increases then decreases |
| Answer» C. remain same | |
| 1303. |
______ is a halogen. |
| A. | magnesium |
| B. | Krypton |
| C. | Chlorine |
| D. | Sodium |
| Answer» D. Sodium | |
| 1304. |
Esters have _________ smell. |
| A. | Rotten |
| B. | Pungent |
| C. | Chemical |
| D. | Fruity |
| Answer» E. | |
| 1305. |
Given in the options are sets of particular characteristics of elements and how they vary across the period and down the group in the following format:Characteristic of an element — Across the period — Down the groupSelect the correct set from the given options. |
| A. | Electropositive character metallic character — Increase — Decrease |
| B. | Electropositive character metallic character — Increase — Increase |
| C. | Electropositive character metallic character — Decrease — Increase |
| D. | Electropositive character metallic character — Decrease — Decrease |
| Answer» D. Electropositive character metallic character — Decrease — Decrease | |
| 1306. |
___________ is produced from incomplete burning of fuels such as petrol and diesel. |
| A. | Carbon dioxide |
| B. | Carbon monoxide |
| C. | Nitric oxide |
| D. | Nitrogen dioxide |
| Answer» C. Nitric oxide | |
| 1307. |
Limestone, chalk and marble are different forms of: |
| A. | calcium carbonate |
| B. | soda ash |
| C. | sodium chloride |
| D. | Sodium nitrate |
| Answer» B. soda ash | |
| 1308. |
In the Modern Periodic Table, which group has a completely filled valence shell and chemically inactive elements? |
| A. | 16 |
| B. | 18 |
| C. | 15 |
| D. | 17 |
| Answer» C. 15 | |
| 1309. |
Given that \({\rm{E}}_{{{\rm{O}}_2}/{{\rm{H}}_2}{\rm{O}}}^ \ominus = + 1.23{\rm{\;V}}\)\({\rm{E}}_{{{\rm{S}}_2}{\rm{O}}_8^{2 - }/{\rm{SO}}_4^{2 - }}^ \ominus = 2.05{\rm{\;V}}\)\({\rm{E}}_{{\rm{B}}{{\rm{r}}_2}/{\rm{Br}}}^ \ominus = + 1.09{\rm{\;V}}\)\({\rm{E}}_{{\rm{A}}{{\rm{u}}^{3 + }}/{\rm{Au}}}^ \ominus = + 1.4{\rm{\;V}}\)The strongest oxidizing agent is: |
| A. | Au3+ |
| B. | O2 |
| C. | \({{\rm{S}}_2}{\rm{O}}_8^{2 - }\) |
| D. | Br2 |
| Answer» D. Br2 | |
| 1310. |
Dobereiner made the first observations on ______ as a catalyst. |
| A. | Au |
| B. | Ni |
| C. | Ag |
| D. | Pt |
| Answer» E. | |
| 1311. |
Number of stereo centres present in linear and cyclic structures of glucose are respectively: |
| A. | 5 & 4 |
| B. | 4 & 4 |
| C. | 5 & 5 |
| D. | 4 & 5 |
| Answer» E. | |
| 1312. |
Bromine is a: |
| A. | Non-metal |
| B. | Metalloid |
| C. | Plastic |
| D. | Metal |
| Answer» B. Metalloid | |
| 1313. |
________ element is presented by the given symbol. |
| A. | Hydrogen |
| B. | Mercury |
| C. | Carbon |
| D. | Gold |
| Answer» C. Carbon | |
| 1314. |
According to Mendeleev's periodic law, the elements were arranged in the periodic table in the order of ________. |
| A. | Increasing atomic masses |
| B. | Decreasing atomic masses |
| C. | Decreasing atomic number |
| D. | Increasing atomic number |
| Answer» B. Decreasing atomic masses | |
| 1315. |
An example of solid sol is |
| A. | Gem stone |
| B. | Hair cream |
| C. | Butter |
| D. | Paint |
| Answer» B. Hair cream | |
| 1316. |
Calcium carbide is used for artificial ripening of green fruits because it produces |
| A. | Acetylene |
| B. | Methylene |
| C. | Florigen |
| D. | Auxin |
| Answer» B. Methylene | |
| 1317. |
Organic compounds are compounds of the element ______. |
| A. | Silicon |
| B. | Nitrogen |
| C. | Carbon |
| D. | Lead |
| Answer» D. Lead | |
| 1318. |
Gypsum is added to cement in order to __________. |
| A. | Delay the initial setting |
| B. | Control the proportion |
| C. | Control the rate of setting |
| D. | Improve the time of setting |
| Answer» D. Improve the time of setting | |
| 1319. |
Oxygen occurs in nature in ______ isotopic forms. |
| A. | 2 |
| B. | 3 |
| C. | 4 |
| D. | 1 |
| Answer» C. 4 | |
| 1320. |
_________ element is added with copper and zinc to form bronze. |
| A. | Sn |
| B. | Pb |
| C. | Au |
| D. | Al |
| Answer» B. Pb | |
| 1321. |
_______ is the most electropositive and ______ is the most electronegative element of the third period of the modern periodic table.A. Sodium, PotassiumB. Magnesium, AluminiumC. Sodium, ChlorineD. Aluminium, Chlorine |
| A. | B |
| B. | D |
| C. | A |
| D. | C |
| Answer» E. | |
| 1322. |
Graphite is a much better conductor of heat and electricity than diamond. This is due to the fact that each carbon atom in graphite: |
| A. | undergoes sp2 hybridization and forms three sigma bonds with three neighbouring carbon atoms |
| B. | undergoes sp3 hybridization |
| C. | is tetrahedrally bonded |
| D. | is free from van der Waals force |
| Answer» B. undergoes sp3 hybridization | |
| 1323. |
In Aqua Regia which two acids are mixed in ratio of 3 : 1? |
| A. | HCL and HNO3 |
| B. | Silver |
| C. | HNO3 and H2CO3 |
| D. | HCL and H2CO3 |
| Answer» B. Silver | |
| 1324. |
Excessive use of which of the following fertilizers may be responsible for the presence of a toxic substance in groundwater? |
| A. | Nitrogen |
| B. | Phosphate only |
| C. | Potassium only |
| D. | Phosphate and potassium |
| Answer» B. Phosphate only | |
| 1325. |
Antifertility drug is: |
| A. | aspartame |
| B. | soframicine |
| C. | novestrol |
| D. | prontosil |
| Answer» D. prontosil | |
| 1326. |
An element has electronic configuration 2,8,6. It belongs to _____. |
| A. | 6 group and 2 period |
| B. | 16 group and 3 period |
| C. | 1 group and 1 period |
| D. | 2 group and 2 period |
| Answer» C. 1 group and 1 period | |
| 1327. |
Among the given elements, which comes first in the periodic table of elements? |
| A. | Sodium |
| B. | Hydrogen |
| C. | Potassium |
| D. | Silicon |
| Answer» C. Potassium | |
| 1328. |
Magnesium powder burns in air to give: |
| A. | Mg(NO3)2 and Mg3N2 |
| B. | MgO and Mg3N2 |
| C. | MgO only |
| D. | MgO and Mg(NO3)2 |
| Answer» C. MgO only | |
| 1329. |
Among the following, the set of parameters that represents path functions, is:(1) q + w(2) q(3) w(4) H – TS |
| A. | (2) and (3) |
| B. | (2), (3) and (4) |
| C. | (1) and (4) |
| D. | (1), (2) and (3) |
| Answer» B. (2), (3) and (4) | |
| 1330. |
_______ element has two orbits that are completely filled. |
| A. | He |
| B. | Ar |
| C. | Kr |
| D. | Ne |
| Answer» E. | |
| 1331. |
Butter is stored at what temperature, in a commercial cold storage? |
| A. | 0°C |
| B. | -20°C |
| C. | 4°C |
| D. | -4°C |
| Answer» C. 4°C | |
| 1332. |
A non-metal with high melting and boiling point is ________. |
| A. | chlorine |
| B. | hydrogen |
| C. | bromine |
| D. | graphite |
| Answer» E. | |
| 1333. |
At what pH value tooth starts to decay? |
| A. | 11.2 |
| B. | 6.5 |
| C. | 7.5 |
| D. | 5.5 |
| Answer» E. | |
| 1334. |
Calculate the mass in milligrams of 1022 atoms of U-238. |
| A. | 395.2 mg |
| B. | 3952 mg |
| C. | 238 mg |
| D. | 1022 mg |
| Answer» C. 238 mg | |
| 1335. |
Acid rain that corrodes the marble of the Taj Mahal is made up of which acids? |
| A. | Nitric acid and sulphuric acid |
| B. | Carbonic acid and oxalic acid |
| C. | Formic acid and carbonic acid |
| D. | Acetic acid and formic acid |
| Answer» B. Carbonic acid and oxalic acid | |
| 1336. |
Protium, deuterium and tritium are the naturally occurring isotopes of: |
| A. | nitrogen |
| B. | gold |
| C. | carbon |
| D. | hydrogen |
| Answer» E. | |
| 1337. |
In the following compounds, the decreasing order of basic strength will be: |
| A. | C2H5 NH2> NH3> (C2H5)2 NH |
| B. | (C2H5)2 NH > NH3> C2H5NH2 |
| C. | (C2H5)2 NH > C2H5NH2> NH3 |
| D. | NH3> C2 H5NH2> (C2H5)2 NH |
| Answer» D. NH3> C2 H5NH2> (C2H5)2 NH | |
| 1338. |
Hydrogen fuel cell vehicles produce one of the following as "exhaust" |
| A. | NH3 |
| B. | CH4 |
| C. | H2O |
| D. | H2O2 |
| Answer» D. H2O2 | |
| 1339. |
Atomic number of copper is: |
| A. | 23 |
| B. | 29 |
| C. | 25 |
| D. | 28 |
| Answer» C. 25 | |
| 1340. |
______ is prevented by coating the conducting wire with pvc. |
| A. | Fusing |
| B. | Overloading |
| C. | Dripping |
| D. | Short-circuit |
| Answer» E. | |
| 1341. |
If one mixes up ashes with animal fat, the substance received in the crude form is called? |
| A. | Pheromone |
| B. | Soap |
| C. | Cement |
| D. | Concrete |
| Answer» C. Cement | |
| 1342. |
Phosphorus is kept in water so that it _______.A. Avoid spoilageB. Avoid catching fire.C. Ensure durability.D. Stay out of reach of children. |
| A. | B |
| B. | D |
| C. | C |
| D. | A |
| Answer» B. D | |
| 1343. |
Give the expansion of DDT |
| A. | DichloroDinitro Trichloro Ethane |
| B. | DichloroDiPhenylTrichloro Ethane |
| C. | DichloroDiazylTrichloro Ethane |
| D. | DichloroDiaminoTrichloro Ethane |
| Answer» C. DichloroDiazylTrichloro Ethane | |
| 1344. |
Limonite ore is the ore of which metal? |
| A. | Iron |
| B. | Aluminium |
| C. | Zinc |
| D. | Cobalt |
| Answer» B. Aluminium | |
| 1345. |
Match the following with the correct response: (1) Cobalt (A) S (2) Copper (B) Co (3) Sulphur (C) Na (4) Sodium (D) Cu |
| A. | 1 – B, 2 – A, 3 – D, 4 - C |
| B. | 1 – D, 2 – B, 3 – A, 4 - C |
| C. | 1 – C, 2 – D, 3 – A, 4 - B |
| D. | 1 – B, 2 – D, 3 – A, 4 - C |
| Answer» E. | |
| 1346. |
Copper reacts with moist carbon dioxide in the air to form green coloured. |
| A. | Copper oxide |
| B. | Copper carbonate |
| C. | Copper chloride |
| D. | Copper carbide |
| Answer» C. Copper chloride | |
| 1347. |
March List-I with List-II and select the correct answer using the code given below the Lists:List I (Element)List II(Highest Valency)A. Sulfur1. FiveB. Phosphorous2. SixC. Lead3. TwoD. Silver4. Four |
| A. | A - 2, B – 4, C – 1, D – 3 |
| B. | A – 2, B – 1, C – 4, D – 3 |
| C. | A – 3, B – 1, C – 4, D – 2 |
| D. | A – 3, B – 4, C – 1, D - 2 |
| Answer» C. A – 3, B – 1, C – 4, D – 2 | |
| 1348. |
Plaster of Paris ________.I. changes into gypsum on mixing with waterII. is CaSO4.2H2OIII. is used for decoration |
| A. | Only I and II |
| B. | Only I and III |
| C. | Only II and III |
| D. | All I, II and III |
| Answer» C. Only II and III | |
| 1349. |
_______ is called a metalloid. |
| A. | Silicon |
| B. | Sodium |
| C. | Mercury |
| D. | Iodine |
| Answer» B. Sodium | |
| 1350. |
A radioactive rare gas is |
| A. | Helium |
| B. | Krypton |
| C. | Xenon |
| D. | Radon |
| Answer» E. | |