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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.
| 2351. |
The nucleus of a hydrogen atom consists of |
| A. | 1 proton only |
| B. | 1 proton + 2 neutron |
| C. | 1 neutron only |
| D. | 1 electron only |
| Answer» B. 1 proton + 2 neutron | |
| 2352. |
The most commonly used bleaching agent is |
| A. | alcohol |
| B. | carbon dioxide |
| C. | chlorine |
| D. | sodium chlorine |
| Answer» D. sodium chlorine | |
| 2353. |
The nuclear particles which are assumed to hold the nucleons together are |
| A. | electrons |
| B. | positrons |
| C. | neutrons |
| D. | mesons |
| Answer» E. | |
| 2354. |
The heat required to raise the temperature of body by 1 K is called |
| A. | specific heat |
| B. | thermal capacity |
| C. | water equivalent |
| D. | None of the above |
| Answer» C. water equivalent | |
| 2355. |
The fumes of sulfur dioxide (SO₂) are |
| A. | toxic |
| B. | harmless |
| C. | mild |
| D. | sweet |
| Answer» B. harmless | |
| 2356. |
Avogadro's constant is the number which was first calculated by |
| A. | Joseph Loschmidt |
| B. | Amedeo Avogadro |
| C. | Galileo |
| D. | Charles |
| Answer» B. Amedeo Avogadro | |
| 2357. |
Halogenoarenes are banned due to its |
| A. | degradation |
| B. | unreactiveness |
| C. | non-toxicity |
| D. | none of above |
| Answer» B. unreactiveness | |
| 2358. |
The smaller units which react together to form polymer are called |
| A. | polymer units |
| B. | isomer |
| C. | monomer |
| D. | diatoms |
| Answer» D. diatoms | |
| 2359. |
In gases, particles are |
| A. | very close together |
| B. | father apart |
| C. | farthest apart |
| D. | possessed with least kinetic energy |
| Answer» D. possessed with least kinetic energy | |
| 2360. |
1 mole of a sodium chloride (NaCl) has number of sodium ions (Na⁺) equal to |
| A. | 6.02 x 10²³ |
| B. | 5.02 x 10²³ |
| C. | 4.02 x 10²³ |
| D. | 3.02 x 10²³ |
| Answer» B. 5.02 x 10²³ | |
| 2361. |
Disposal of poly(ethene) bag is extremely difficult and it can cause pollution for coming |
| A. | years |
| B. | days |
| C. | months |
| D. | centuries |
| Answer» E. | |
| 2362. |
The number of major groups which are vertical numbers is |
| A. | seven |
| B. | eight |
| C. | nine |
| D. | five |
| Answer» C. nine | |
| 2363. |
In the production of phenylamine, it is separated from the reaction mixture by process of |
| A. | steam distillation |
| B. | extraction |
| C. | sublimation |
| D. | evaporation |
| Answer» B. extraction | |
| 2364. |
Evaporation occurs only |
| A. | after boiling |
| B. | after extreme cooling |
| C. | at the surface of a liquid |
| D. | if boiling occurs at atmospheric pressure |
| Answer» D. if boiling occurs at atmospheric pressure | |
| 2365. |
A long chain made up of small repeating units is a |
| A. | polymer |
| B. | isomer |
| C. | isotope |
| D. | allotrope |
| Answer» B. isomer | |
| 2366. |
Number of moles of substance can be determined by |
| A. | mass of substance/molar mass |
| B. | mass of substance/molecular mass |
| C. | atomic weight of substance/Avogadro constant |
| D. | volume of substance |
| Answer» B. mass of substance/molecular mass | |
| 2367. |
The sodium burns with the flame of color |
| A. | blue |
| B. | red |
| C. | yellow |
| D. | apple green |
| Answer» D. apple green | |
| 2368. |
Gases do not have any fixed |
| A. | shape only |
| B. | volume only |
| C. | density |
| D. | shape and volume |
| Answer» E. | |
| 2369. |
Crude oil is a complex mixture of |
| A. | alkanes |
| B. | cycloalkanes |
| C. | aromatic compounds |
| D. | all of above |
| Answer» E. | |
| 2370. |
The number of moles of solute present in 1 kg of a solvent is called its |
| A. | molality |
| B. | molarity |
| C. | normality |
| D. | formality |
| Answer» B. molarity | |
| 2371. |
The nucleus of an atom consists of |
| A. | electrons and neutrons |
| B. | electrons and protons |
| C. | protons and neutrons |
| D. | All of the above |
| Answer» D. All of the above | |
| 2372. |
The metal used to recover copper from a solution of copper sulphate is |
| A. | Na |
| B. | Ag |
| C. | Hg |
| D. | Fe |
| Answer» E. | |
| 2373. |
The most electronegative element among the following is |
| A. | sodium |
| B. | bromine |
| C. | fluorine |
| D. | oxygen |
| Answer» D. oxygen | |
| 2374. |
The number of d-electrons in Fe2+ (Z = 26) is not equal to that of |
| A. | p-electrons in Ne(Z = 10) |
| B. | s-electrons in Mg(Z = 12) |
| C. | d-electrons in Fe(Z = 26) |
| D. | p-electrons in CI(Z = 17) |
| Answer» E. | |
| 2375. |
Attractive forces between particles is weakest in |
| A. | solids |
| B. | liquids |
| C. | gases |
| D. | all of these |
| Answer» D. all of these | |
| 2376. |
Substances which transform from solid into a gas directly, are called as |
| A. | Amphoteric oxides |
| B. | basic oxides |
| C. | sublimations |
| D. | neutral oxides |
| Answer» D. neutral oxides | |
| 2377. |
Rate of diffusion |
| A. | decreases if the kinetic energy increases |
| B. | increased if the temperature is decreased |
| C. | is inversely proportional to the mass of the particles |
| D. | is directly proportional to the mass of the particles |
| Answer» D. is directly proportional to the mass of the particles | |
| 2378. |
Natural mixing of particles is called as |
| A. | sublimation |
| B. | purification |
| C. | distillation |
| D. | diffusion |
| Answer» E. | |
| 2379. |
The carbon-halogen bond in Halogenoarenes is much more stronger than equivalent bond of |
| A. | alkane |
| B. | alkene |
| C. | halogenoalkane |
| D. | none of above |
| Answer» D. none of above | |
| 2380. |
Hydrocarbons which contain a ring of three or more carbon atoms are called |
| A. | alkanes |
| B. | cycloalkanes |
| C. | aromatic compounds |
| D. | none of above |
| Answer» C. aromatic compounds | |
| 2381. |
In mass spectrometer M/E is plotted on |
| A. | x axis |
| B. | y axis |
| C. | z axis |
| D. | both a and b |
| Answer» B. y axis | |
| 2382. |
Enzyme trypsin acts upon |
| A. | lysine residues in peptide bonds only |
| B. | arginine residues in peptide bonds only |
| C. | trypsin residues in peptide bonds |
| D. | lysine and arginine residues in peptide bonds |
| Answer» E. | |
| 2383. |
Trim ethylamine is an example of |
| A. | primary amines |
| B. | secondary amines |
| C. | tertiary amines |
| D. | quaternary amines |
| Answer» D. quaternary amines | |
| 2384. |
The types of stereoisomerism are optical isomerism and |
| A. | cis-isomerism |
| B. | trans-isomerism |
| C. | cis-trans isomerism |
| D. | none of above |
| Answer» D. none of above | |
| 2385. |
Consider the reaction: (NH₂)₂CO + H₂O → NH₃ + CO₂. The reaction is catalyzed by the enzyme |
| A. | amylase |
| B. | protease |
| C. | urease |
| D. | galactose |
| Answer» D. galactose | |
| 2386. |
Lysine and arginine are left behind in peptides bonds and are known as |
| A. | amylase |
| B. | trypsin |
| C. | urease |
| D. | lactase |
| Answer» D. lactase | |
| 2387. |
Individual chemicals involved in the sequences of reactions are called |
| A. | metabolism |
| B. | metabolites |
| C. | catalysts |
| D. | enzymes |
| Answer» C. catalysts | |
| 2388. |
The compounds which contain oxides of carbon or carbonate hydrogen carbonate ions are called |
| A. | hydrocarbons |
| B. | organic compounds |
| C. | inorganic compounds |
| D. | carbohydrogens |
| Answer» D. carbohydrogens | |
| 2389. |
Magnesium and Aluminum burns with bright white flames and reacts vigorously when heated with |
| A. | nitrogen |
| B. | oxygen |
| C. | carbon dioxide |
| D. | sulfuric acid |
| Answer» C. carbon dioxide | |
| 2390. |
Particles in solids have |
| A. | least energy |
| B. | lesser energy |
| C. | greatest energy |
| D. | greatest distances |
| Answer» B. lesser energy | |
| 2391. |
Alcoholic drinks are manufactured by fermentation of |
| A. | sugar cane |
| B. | glucose |
| C. | ethene |
| D. | ethane |
| Answer» C. ethene | |
| 2392. |
Hydrochloric acid completely ionized in solution hence it is |
| A. | weak monobasic acid |
| B. | strong monobasic acid |
| C. | weak monoacid base |
| D. | strong monoacid base |
| Answer» C. weak monoacid base | |
| 2393. |
Sodium hydroxide ionizes in solution |
| A. | partially |
| B. | completely |
| C. | incompletely |
| D. | slowly |
| Answer» C. incompletely | |
| 2394. |
For complex molecules, a chemist usually represents a molecule by |
| A. | molecular formula |
| B. | empirical formula |
| C. | skeletal formula |
| D. | simple formula |
| Answer» D. simple formula | |
| 2395. |
Phenyl amine is involved importantly in the synthesis of |
| A. | dyes |
| B. | medicines |
| C. | drugs |
| D. | capsules |
| Answer» B. medicines | |
| 2396. |
Aluminum oxide reacts as an acid upon reaction with |
| A. | water |
| B. | acid |
| C. | base |
| D. | alkali |
| Answer» D. alkali | |
| 2397. |
1 atomic mass unit is equal to |
| A. | 1.661x10-27 |
| B. | 1.665x10-23 |
| C. | 1.661x10-34 |
| D. | 1.661x10-21 |
| Answer» B. 1.665x10-23 | |
| 2398. |
Data loggers are helpful in |
| A. | plotting a heating curve |
| B. | plotting a cooling curve |
| C. | plotting a condensation curve |
| D. | both a and b |
| Answer» E. | |
| 2399. |
The lower molar mass of hydrocarbons has increased |
| A. | polarity |
| B. | volatility |
| C. | boiling point |
| D. | none of above |
| Answer» C. boiling point | |
| 2400. |
Hydrolysis of peptides is aided through the enzyme |
| A. | urease |
| B. | trypsin |
| C. | amylase |
| D. | thrombokinase |
| Answer» C. amylase | |