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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.
| 2301. |
The states of matter are |
| A. | solid, liquid, gas |
| B. | solid, molten |
| C. | solid, vapor |
| D. | solid, gas |
| Answer» B. solid, molten | |
| 2302. |
Examples of sublime substances do not include |
| A. | solid carbon dioxide |
| B. | ammonium salts |
| C. | zinc |
| D. | iodine |
| Answer» D. iodine | |
| 2303. |
Danish chemist Soren Sorensen first time introduced |
| A. | pH |
| B. | periodic table |
| C. | ionization |
| D. | polarity |
| Answer» B. periodic table | |
| 2304. |
The Aromatic compounds are known as |
| A. | arenes |
| B. | alkanes |
| C. | cyclic alkenes |
| D. | alkenes |
| Answer» B. alkanes | |
| 2305. |
Consider the reaction: (NH₂)₂CO + H₂O → NH₃ + CO₂. Water in this reaction |
| A. | acts as a solvent |
| B. | helps to dissolve the residues away |
| C. | acts with the urea only after urea is bound to enzyme surface |
| D. | acts as a suspension |
| Answer» D. acts as a suspension | |
| 2306. |
Structural formula -CONH₂ is representing |
| A. | alkyls |
| B. | amines |
| C. | amides |
| D. | arenes |
| Answer» D. arenes | |
| 2307. |
Particles are arranged in regular rows in |
| A. | solids |
| B. | liquids |
| C. | gases |
| D. | all of these |
| Answer» B. liquids | |
| 2308. |
The genetic material DNA is found in |
| A. | Cytoplasm |
| B. | Ribosome |
| C. | Mitochondria |
| D. | Nucleus |
| Answer» E. | |
| 2309. |
Consider the reaction: (NH₂)₂CO + H₂O → NH₃ + CO₂. The substrate in this reaction is |
| A. | urease |
| B. | urea |
| C. | water |
| D. | Hydrogen Gas |
| Answer» C. water | |
| 2310. |
Under certain conditions, the ethene molecule reacts to give |
| A. | isomer |
| B. | polymer |
| C. | isotope |
| D. | monomer |
| Answer» C. isotope | |
| 2311. |
The empirical formula for propane is |
| A. | CH₂ |
| B. | C₂H₄ |
| C. | C₆H₁₂ |
| D. | C₂H |
| Answer» B. C₂H₄ | |
| 2312. |
The solution is highly concentrated when the solute is in |
| A. | high concentration |
| B. | low concentration |
| C. | high temperature |
| D. | low temperature |
| Answer» B. low concentration | |
| 2313. |
The substances which are the basis of human life on earth are |
| A. | atom |
| B. | molecules |
| C. | matter |
| D. | organic compounds |
| Answer» E. | |
| 2314. |
Sulphur has charge of |
| A. | −3 |
| B. | −2 |
| C. | −1 |
| D. | 0 |
| Answer» C. −1 | |
| 2315. |
To make nitrobenzene, the nitrating mixture is refluxed at |
| A. | 55 °C |
| B. | 15 °C |
| C. | 25 °C |
| D. | 43 °C |
| Answer» B. 15 °C | |
| 2316. |
Alkenes mostly follow the reaction of |
| A. | addition reaction |
| B. | elimination reaction |
| C. | substitution reaction |
| D. | none of above |
| Answer» B. elimination reaction | |
| 2317. |
Hydrocarbons containing double bonds are called |
| A. | Alkanes |
| B. | alkenes |
| C. | arenes |
| D. | ketone |
| Answer» C. arenes | |
| 2318. |
Number of subatomic particles in atoms is more than |
| A. | 200 |
| B. | 67 |
| C. | 89 |
| D. | 100 |
| Answer» E. | |
| 2319. |
Presence of impurities cause |
| A. | a rise in boiling point |
| B. | a fall in melting point |
| C. | a fall in condensation point |
| D. | both a and b |
| Answer» E. | |
| 2320. |
If the position of functional group varies in each of its isomer then its is |
| A. | position isomerism |
| B. | functional group isomerism |
| C. | chain isomerism |
| D. | none of above |
| Answer» B. functional group isomerism | |
| 2321. |
Blue flame in a gas jar of oxygen gas (O₂) is burning through powder of |
| A. | carbon |
| B. | sulfur |
| C. | aluminum |
| D. | magnesium |
| Answer» C. aluminum | |
| 2322. |
Molecular formula is determined by multiplying n with |
| A. | Molar mass |
| B. | atomic number |
| C. | atomic mass |
| D. | empirical formula |
| Answer» E. | |
| 2323. |
The reducing agent used for the reduction of aldehydes and ketone is |
| A. | tetrafluorate |
| B. | tetrahydridoborate |
| C. | tetrafluroborate |
| D. | tetrachloride |
| Answer» C. tetrafluroborate | |
| 2324. |
Many enzyme-catalyzed reactions are carried out in |
| A. | cell surface membranes |
| B. | Cytoplasm |
| C. | Nucleus |
| D. | mitochondrion |
| Answer» C. Nucleus | |
| 2325. |
One of three p-orbitals on nitrogen atom overlaps with pi bonding system in 'benzene ring' in the molecule of |
| A. | phenyl amine |
| B. | ethylamine |
| C. | propylamine |
| D. | methylamine |
| Answer» B. ethylamine | |
| 2326. |
Molecule of methane contains four |
| A. | hydrogen atoms |
| B. | sulphur atoms |
| C. | nitrogen atoms |
| D. | oxygen atoms |
| Answer» B. sulphur atoms | |
| 2327. |
Terbium (Tb) atomic mass of 159 belongs to block |
| A. | s |
| B. | p |
| C. | f |
| D. | d |
| Answer» D. d | |
| 2328. |
Melting point of water is |
| A. | 0 °C |
| B. | −210 °C |
| C. | −78 °C |
| D. | 20 °C |
| Answer» B. −210 °C | |
| 2329. |
Fixed volumes is a characteristic of |
| A. | liquids |
| B. | solids |
| C. | gases |
| D. | both a and b |
| Answer» E. | |
| 2330. |
Ethylamine (C₂H₇N) is a stronger base, as it is by nature electron |
| A. | acceptor |
| B. | donator |
| C. | exchanger |
| D. | depleter |
| Answer» C. exchanger | |
| 2331. |
The reaction in which diazonium ion reacts with an alkaline solution of phenol to produce azo dye is called |
| A. | coupling reaction |
| B. | desorption |
| C. | diazotization |
| D. | assimilation |
| Answer» B. desorption | |
| 2332. |
The catalyst which is used to break hydrocarbons is |
| A. | cryolite |
| B. | zeolite |
| C. | bauxite |
| D. | alcoxite |
| Answer» C. bauxite | |
| 2333. |
After bubbling through concentrated solution of any hydrogen halide, the product obtained is |
| A. | halogen |
| B. | alkane |
| C. | halogen alkane |
| D. | halogen alkene |
| Answer» E. | |
| 2334. |
The maximum number of covalent formed by nitrogen is |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» E. | |
| 2335. |
The Latin word formica means ant. The name formic acid is derived from this Latin word because |
| A. | this acid, in ancient times, was used to eliminate ant-hills |
| B. | this corrosive acid is secreted by ants to drive away their enemies |
| C. | this acid was first obtained by the distillation of ants |
| D. | ants are attracted by the odour of this acid |
| Answer» D. ants are attracted by the odour of this acid | |
| 2336. |
The number of g-molecule of oxygen in 6.02 x 1024CO molecules is |
| A. | 1 gram of molecule |
| B. | 0.5 gram of molecule |
| C. | 5 gram of molecule |
| D. | 10 gram of molecule |
| Answer» D. 10 gram of molecule | |
| 2337. |
The names of the scientists, Newlands, Mendeleev, and Meyer are associated with the development of |
| A. | atomic structure |
| B. | metallurgy |
| C. | periodic table of contents |
| D. | discovery of elements |
| Answer» D. discovery of elements | |
| 2338. |
The material which can be deformed permanently by heat and pressure is called a |
| A. | thermoplastic |
| B. | thermoset |
| C. | chemical compound |
| D. | polymer |
| Answer» C. chemical compound | |
| 2339. |
Zone refining is used for the purification of |
| A. | Au |
| B. | Ge |
| C. | Ag |
| D. | Cu |
| Answer» C. Ag | |
| 2340. |
The inherited traits of an organism are controlled by |
| A. | RNA molecules |
| B. | nucleotides |
| C. | DNA molecules |
| D. | enzymes |
| Answer» D. enzymes | |
| 2341. |
The main chemical constituent of the oil of cardamom which is responsible for flavour of this oil is |
| A. | cineole |
| B. | engenol |
| C. | geraniol |
| D. | limonene |
| Answer» B. engenol | |
| 2342. |
Equal masses of oxygen, hydrogen and methane are kept under identical conditions. The ratio of the volumes of gases will be |
| A. | 2 : 16 : 2 |
| B. | 2 : 16 : 1 |
| C. | 1 : 16 : 2 |
| D. | 1 : 1 : 1 |
| Answer» D. 1 : 1 : 1 | |
| 2343. |
The octane number of zero is assigned to |
| A. | 2-methyl octane |
| B. | n-heptane |
| C. | iso-octane |
| D. | 3-methyl octane |
| Answer» C. iso-octane | |
| 2344. |
The mass of P4O10 that will be obtained from the reaction of 1.33 gram of P4 and 5.07 of oxygen is |
| A. | 2.05 gram |
| B. | 3.05 gram |
| C. | 4.05 gram |
| D. | 5.05 gram |
| Answer» C. 4.05 gram | |
| 2345. |
The main buffer system of the human blood is |
| A. | H2CO3 - HCO3 |
| B. | H2CO3 - CO32- |
| C. | CH3COOH - CH3COO- |
| D. | NH2CONH2 - NH2CONH+ |
| Answer» B. H2CO3 - CO32- | |
| 2346. |
The metallurgical process in which a metal is obtained in a fused state is called |
| A. | smelting |
| B. | roasting |
| C. | calcinations |
| D. | froth floatation |
| Answer» B. roasting | |
| 2347. |
The oldest rocks in the earth's crust were once molten, and came from deep inside the earth. The molten rock, called magma, spewed out in volcanic eruptions during the earth;s early life and solidified into hard rock's called |
| A. | granite |
| B. | basalt |
| C. | igneous rocks |
| D. | sedimentary rocks |
| Answer» D. sedimentary rocks | |
| 2348. |
The molecules of which gas have highest speed? |
| A. | H2 at -73°C |
| B. | CH4 at 300 K |
| C. | N2 at 1,027°C |
| D. | O2 at 0°C |
| Answer» B. CH4 at 300 K | |
| 2349. |
The law which states that the amount of gas dissolved in a liquid is proportional to its partial pressure is |
| A. | Dalton's law |
| B. | Gay Lussac's law |
| C. | Henry's law |
| D. | Raoult's law |
| Answer» D. Raoult's law | |
| 2350. |
The gas present in the stratosphere which filters out some of the sun's ultraviolet light and provides an effective shield against radiation damage to living things is |
| A. | helium |
| B. | ozone |
| C. | oxygen |
| D. | methane |
| Answer» C. oxygen | |