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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.
| 2251. |
The compounds of alkanes which are in high demands are |
| A. | gasoline fraction only |
| B. | naphtha fraction only |
| C. | gasohol |
| D. | gasoline and naphtha fraction |
| Answer» E. | |
| 2252. |
Enantiomers is the termed given to |
| A. | optical isomers |
| B. | chain isomer |
| C. | functional isomer |
| D. | structural isomer |
| Answer» B. chain isomer | |
| 2253. |
Isotopes of cadmium are |
| A. | nine |
| B. | seven |
| C. | six |
| D. | five |
| Answer» B. seven | |
| 2254. |
Of the given series of actions, action performed first is the |
| A. | substrate diffuses to the active site |
| B. | enzyme-substrate complex is binded |
| C. | amino acids may acts as nucleophiles |
| D. | products diffuse away from the active site |
| Answer» B. enzyme-substrate complex is binded | |
| 2255. |
The scientific definition of pH is the negative logarithm to base 10 of |
| A. | H⁺ ion concentration |
| B. | OH⁻ ion concentration |
| C. | power of hydroxyl group |
| D. | power of hydrogen |
| Answer» B. OH⁻ ion concentration | |
| 2256. |
Aluminum oxide does not react with |
| A. | acids (conc.) |
| B. | water |
| C. | alkali (conc.) |
| D. | any of these |
| Answer» C. alkali (conc.) | |
| 2257. |
Amines and its derivatives are used to treat diseases like |
| A. | malaria |
| B. | insomnia |
| C. | sleeping sickness |
| D. | all of above |
| Answer» E. | |
| 2258. |
A constant temperature at which a pure liquid changes into a gas is called |
| A. | latent heat of vaporization |
| B. | depression in freezing point |
| C. | boiling point |
| D. | melting point |
| Answer» D. melting point | |
| 2259. |
Word atom was derived from |
| A. | Atama |
| B. | Atomos |
| C. | atim |
| D. | atme |
| Answer» C. atim | |
| 2260. |
Compounds which have different arrangements of atoms in space while having same atoms bonded to each other are said to have |
| A. | position isomerism |
| B. | functional group isomerism |
| C. | chain isomerism |
| D. | stereoisomerism |
| Answer» E. | |
| 2261. |
The recurrence of the same pattern in the periodic table is called its |
| A. | periodicity |
| B. | regular pattern |
| C. | intervals |
| D. | none of above |
| Answer» B. regular pattern | |
| 2262. |
Wide range of different hydrocarbons are separated into fractions through |
| A. | fractional decomposition |
| B. | fractional distillation |
| C. | fractional substitution |
| D. | fractional polarization |
| Answer» C. fractional substitution | |
| 2263. |
Types of structural isomerism are |
| A. | position isomerism |
| B. | functional group isomerism |
| C. | chain isomerism |
| D. | all of above |
| Answer» E. | |
| 2264. |
Greatest energy is found in particles of the |
| A. | solids |
| B. | liquids |
| C. | gases |
| D. | diffusing particles |
| Answer» D. diffusing particles | |
| 2265. |
"No fixed volume" is a characteristic of |
| A. | liquids |
| B. | solids |
| C. | gases |
| D. | aqueous solutions |
| Answer» D. aqueous solutions | |
| 2266. |
Masses of atoms or molecules expressed in grams is known as |
| A. | Molar mass |
| B. | empirical mass |
| C. | weight |
| D. | empirical mass |
| Answer» B. empirical mass | |
| 2267. |
The turnover number refers to the number of |
| A. | moles of enzymes converted to product per minute |
| B. | moles of substrate converted to product per minute |
| C. | substrate molecules reacted per enzyme per minute |
| D. | moles of enzymes consumed in the reaction |
| Answer» D. moles of enzymes consumed in the reaction | |
| 2268. |
Forces are weakest in particles of |
| A. | solids |
| B. | liquids |
| C. | gases |
| D. | metal oxides |
| Answer» D. metal oxides | |
| 2269. |
Molecular ions are generated by passing |
| A. | X rays |
| B. | alpha particles |
| C. | both a and b |
| D. | atomic rays |
| Answer» D. atomic rays | |
| 2270. |
In benzene's reactions, benzene maintains its highly stable delocalized pi bonding due to |
| A. | electron's intact |
| B. | proton's intact |
| C. | ions intact |
| D. | neutron's intact |
| Answer» B. proton's intact | |
| 2271. |
Phenomenon of isotopy was discovered by |
| A. | Rutherford |
| B. | Bohr |
| C. | Soddy |
| D. | Democritus |
| Answer» D. Democritus | |
| 2272. |
Branch of chemistry showing quantitative relationship between reactants and products is |
| A. | spectrometry |
| B. | electrometry |
| C. | stoichiometry |
| D. | photometry |
| Answer» D. photometry | |
| 2273. |
The presence of benzene (C₆H₆) ring in an alkylarene can affect the characteristic reactions of its |
| A. | alkyl-side chain |
| B. | beta chain |
| C. | alpha chain |
| D. | none of above |
| Answer» B. beta chain | |
| 2274. |
Amines which are bonded in Alkyl group are |
| A. | primary amines |
| B. | secondary amines |
| C. | tertiary amines |
| D. | quaternary amines |
| Answer» B. secondary amines | |
| 2275. |
Introducing NO₂ group into a molecule is known as |
| A. | nitration |
| B. | nitrogen fixation |
| C. | nitrogenation |
| D. | none of above |
| Answer» B. nitrogen fixation | |
| 2276. |
Two optical isomers are formed from carbon atoms to create a bond of |
| A. | 4 atoms |
| B. | 2 atoms |
| C. | 1 atom |
| D. | 3 atoms |
| Answer» B. 2 atoms | |
| 2277. |
−78 °C is the |
| A. | melting point of carbon dioxide |
| B. | boiling point of carbon dioxide |
| C. | melting point of oxygen gas |
| D. | both a and b |
| Answer» E. | |
| 2278. |
The state of matter with fixed volume which can be compressed slightly is |
| A. | solid |
| B. | liquid |
| C. | gas |
| D. | plasma |
| Answer» C. gas | |
| 2279. |
Wax is a |
| A. | carbonate |
| B. | hydrocarbon |
| C. | hydro carbonate |
| D. | non-metal |
| Answer» C. hydro carbonate | |
| 2280. |
The actual numbers of every type of molecule which is present in a compound are represented by |
| A. | molecular formula |
| B. | empirical formula |
| C. | structural formula |
| D. | skeletal formula |
| Answer» B. empirical formula | |
| 2281. |
In order to burn, a hydrocarbon needs a/an |
| A. | aerobic environment |
| B. | anaerobic environment |
| C. | little CO₂ |
| D. | lot of CO₂ |
| Answer» B. anaerobic environment | |
| 2282. |
Aluminium has charge of positive |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» D. 4 | |
| 2283. |
Carrier bags are usually made from |
| A. | paper |
| B. | wood |
| C. | polyethene |
| D. | polyethane |
| Answer» D. polyethane | |
| 2284. |
Compounds which have the same molecular formula but the different structural formula is called |
| A. | structural isomer |
| B. | molecular isomer |
| C. | optical isomer |
| D. | position isomer |
| Answer» B. molecular isomer | |
| 2285. |
C=C has a high electron density area hence it is |
| A. | non-polar |
| B. | polar |
| C. | unreactive |
| D. | stable |
| Answer» C. unreactive | |
| 2286. |
Nitrous acid is made in test tube because it is |
| A. | stable |
| B. | unstable |
| C. | unreactive |
| D. | volatile |
| Answer» C. unreactive | |
| 2287. |
Reduction of nitrobenzene will produce |
| A. | phenyl amine only |
| B. | water only |
| C. | carboxylic acids |
| D. | phenyl amine and water |
| Answer» E. | |
| 2288. |
By refluxing unsubstituted amide with acid, it will yield |
| A. | ammonia only |
| B. | carboxylic acid only |
| C. | nitrogen gas |
| D. | ammonia and carboxylic acid |
| Answer» E. | |
| 2289. |
The breaking of large less useful hydrocarbons into smaller less useful hydrocarbons is known as |
| A. | decomposition |
| B. | addition |
| C. | cracking |
| D. | breaking |
| Answer» D. breaking | |
| 2290. |
The element that is the backbone of organic molecules is |
| A. | carbon |
| B. | hydrogen |
| C. | oxygen |
| D. | nitrogen |
| Answer» B. hydrogen | |
| 2291. |
The number of atoms of each element in a particular compound is represented through |
| A. | molecular mass |
| B. | ionic mass |
| C. | nucleon number |
| D. | formula |
| Answer» E. | |
| 2292. |
A much slower process than boiling is |
| A. | melting |
| B. | evaporation |
| C. | curdling |
| D. | sublimation |
| Answer» C. curdling | |
| 2293. |
Sulfur trioxide is obtained by oxidation of |
| A. | sulfur |
| B. | sulfur oxide |
| C. | sulfuric acid |
| D. | sulfur dioxide |
| Answer» E. | |
| 2294. |
In plenty of space, natural movement of particles occur due to |
| A. | concentration gradient |
| B. | osmotic pressure |
| C. | diffusion |
| D. | active transport |
| Answer» D. active transport | |
| 2295. |
The compounds which only contain carbon and hydrogen are termed as |
| A. | hydrocarbons |
| B. | organic compounds |
| C. | inorganic compounds |
| D. | carbohydrogens |
| Answer» B. organic compounds | |
| 2296. |
Melting and boiling points of ___________ are always above room temperature |
| A. | solids |
| B. | liquids |
| C. | gases |
| D. | all of these |
| Answer» B. liquids | |
| 2297. |
Sublimations are substances which do not |
| A. | exist at room temperature |
| B. | exist in liquid state at ordinary pressures |
| C. | exist in gaseous form at room temperatures |
| D. | exist in gaseous form at ordinary pressures |
| Answer» C. exist in gaseous form at room temperatures | |
| 2298. |
Two hydrocarbon section of amide molecules are linked together by group |
| A. | CONH |
| B. | CHNO |
| C. | COHN |
| D. | CHON |
| Answer» B. CHNO | |
| 2299. |
One of most common kind of titration involves the exact neutralization of an alkali (OH⁻) by a/an |
| A. | base |
| B. | acid |
| C. | salt |
| D. | suspension |
| Answer» C. salt | |
| 2300. |
Examples of sublime substances include |
| A. | alcohol |
| B. | ammonia |
| C. | nitrates |
| D. | solid carbon dioxide |
| Answer» E. | |