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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.
| 2401. |
The substrate must have the correct |
| A. | size to fit the active site of the enzyme only |
| B. | shape to fit the active site of the enzyme only |
| C. | order to fit in the active site |
| D. | size and shape to fit the active site of the enzyme |
| Answer» E. | |
| 2402. |
Due to the presence of double bonds, alkenes are |
| A. | unsaturated |
| B. | saturated |
| C. | polar |
| D. | non-polar |
| Answer» B. saturated | |
| 2403. |
Alcohols are produced by passing alkenes through |
| A. | steam |
| B. | acid |
| C. | base |
| D. | alkali |
| Answer» B. acid | |
| 2404. |
Two stereoisomer's have completely different |
| A. | arrangement of atoms |
| B. | physical properties |
| C. | chemical properties |
| D. | all of above |
| Answer» E. | |
| 2405. |
Benzene reacts with bromine in the presence of an anhydrous iron bromide(III) catalyst to give |
| A. | electrophilic substitution |
| B. | addition reaction |
| C. | nucleophilic substitution |
| D. | none of above |
| Answer» B. addition reaction | |
| 2406. |
Value of pH is determined by |
| A. | pH electrode |
| B. | pH detector |
| C. | pH balancer |
| D. | pH spectrometer |
| Answer» B. pH detector | |
| 2407. |
Useful alkenes for chemical industries is supplied by |
| A. | oil refineries |
| B. | coal mines |
| C. | oil wells |
| D. | flour mill |
| Answer» B. coal mines | |
| 2408. |
A primary amine is made from ammonia molecule with its H atom replaced by |
| A. | alkyl group only |
| B. | aryl group only |
| C. | amine group |
| D. | alkyl and aryl group |
| Answer» E. | |
| 2409. |
Number of atoms or molecule present in one molar mass of an entity is known as |
| A. | Bohr number |
| B. | Mass number |
| C. | Avogadro's number |
| D. | Atomic number |
| Answer» D. Atomic number | |
| 2410. |
Liquid Carbon Dioxide (CO₂(l)) is used in making |
| A. | caffeine |
| B. | decaffeinated tea |
| C. | decaffeinated coffee |
| D. | fat-rich foods |
| Answer» D. fat-rich foods | |
| 2411. |
Heating and cooling curves are plots of |
| A. | temperature against mass |
| B. | temperature against kinetic energy |
| C. | available space against kinetic energy |
| D. | temperature against time |
| Answer» E. | |
| 2412. |
Due to the presence of lone pair of electrons on nitrogen atom amines and ammonia acts as |
| A. | bases |
| B. | acids |
| C. | alkalis |
| D. | amphoteric |
| Answer» C. alkalis | |
| 2413. |
The state which has a regular arrangement and cannot change its shape is |
| A. | solid |
| B. | liquid |
| C. | gas |
| D. | none of above |
| Answer» B. liquid | |
| 2414. |
Upon burning, a hydrocarbon releases a lot of |
| A. | carbon dioxide |
| B. | carbon monoxide |
| C. | hydrogen |
| D. | oxygen |
| Answer» B. carbon monoxide | |
| 2415. |
If different functional groups are present it is termed as |
| A. | position isomerism |
| B. | functional group isomerism |
| C. | chain isomerism |
| D. | none of above |
| Answer» C. chain isomerism | |
| 2416. |
Particles are farthest apart in |
| A. | solids |
| B. | liquids |
| C. | gases |
| D. | all of these |
| Answer» D. all of these | |
| 2417. |
If hydrogen and alkene are passed over finely divided nickel, it gives off |
| A. | alcohol |
| B. | alkanes |
| C. | aldehydes |
| D. | ketone |
| Answer» C. aldehydes | |
| 2418. |
Unsaturated oils become partially saturated when they are reacted with |
| A. | oxygen |
| B. | hydrogen |
| C. | carbon dioxide |
| D. | carbon monoxide |
| Answer» C. carbon dioxide | |
| 2419. |
Some primary amines do not have NH₂ group at the end and are indicated by |
| A. | numbering |
| B. | alphabets |
| C. | roman letters |
| D. | Greek letters |
| Answer» B. alphabets | |
| 2420. |
The classes of amines include |
| A. | primary amines |
| B. | secondary amines |
| C. | tertiary amines |
| D. | all of above |
| Answer» E. | |
| 2421. |
The symbol used to denote Avogadro's constant is |
| A. | A |
| B. | L |
| C. | V |
| D. | G |
| Answer» C. V | |
| 2422. |
Frances Descroizilles in 18th century developed |
| A. | burette |
| B. | pipette |
| C. | beaker |
| D. | measuring cylinder |
| Answer» C. beaker | |
| 2423. |
Species having a negative or positive charge are |
| A. | Radicals |
| B. | atoms |
| C. | molecules |
| D. | ions |
| Answer» E. | |
| 2424. |
Relative atomic mass of Cu is |
| A. | 61.5 |
| B. | 63.5 |
| C. | 64.5 |
| D. | 67.5 |
| Answer» C. 64.5 | |
| 2425. |
Value of molar volume is |
| A. | 22.14 dm3 |
| B. | 25.14 dm3 |
| C. | 32.14dm3 |
| D. | 44.14dm3 |
| Answer» B. 25.14 dm3 | |
| 2426. |
Atomic mass is mass of carbon taken as |
| A. | 12 |
| B. | 13 |
| C. | 14 |
| D. | 15 |
| Answer» B. 13 | |
| 2427. |
Properties in which isotopes differ are |
| A. | Chemical |
| B. | Physical |
| C. | electrical |
| D. | mechanical |
| Answer» C. electrical | |
| 2428. |
C₆H₁₂ is the formula of a |
| A. | cyclohexane |
| B. | sugar |
| C. | alkanes |
| D. | alkenes |
| Answer» B. sugar | |
| 2429. |
Liquids may become vapors |
| A. | upon boiling only |
| B. | without boiling |
| C. | at a temperature below the boiling point of a liquid |
| D. | at a temperature above the boiling point of a liquid |
| Answer» D. at a temperature above the boiling point of a liquid | |
| 2430. |
Carbon dioxide (CO₂) diffuses |
| A. | slowly than hydrogen |
| B. | slowly than oxygen |
| C. | faster than hydrogen |
| D. | faster than oxygen |
| Answer» C. faster than hydrogen | |
| 2431. |
Purity of a substance can be estimated through |
| A. | boiling points |
| B. | melting points |
| C. | sublimation point |
| D. | both a and b |
| Answer» E. | |
| 2432. |
Methylated spirit is a form of |
| A. | liquid |
| B. | gas |
| C. | crystal |
| D. | aqueous |
| Answer» B. gas | |
| 2433. |
The Russian chemist Dmitri Mendeleev in 1869 devised the |
| A. | Periodic Table |
| B. | Law of thermodynamic |
| C. | law of conservation of energy |
| D. | structure of electron |
| Answer» B. Law of thermodynamic | |
| 2434. |
When there is a low concentration of solute in a solution, it is known as |
| A. | diluted solution |
| B. | saturated solution |
| C. | concentrated solution |
| D. | unsaturated solution |
| Answer» B. saturated solution | |
| 2435. |
Rate of diffusion is |
| A. | increased if the temperature is increased |
| B. | decreases if the kinetic energy decreases |
| C. | decreases if the molecular mass is increased |
| D. | all of these |
| Answer» E. | |
| 2436. |
Ability of dissolving animal fats is found in |
| A. | solid carbon dioxide |
| B. | liquid carbon dioxide |
| C. | gaseous carbon dioxide |
| D. | all of these |
| Answer» C. gaseous carbon dioxide | |
| 2437. |
If ethene is a reactant, then the product will be |
| A. | ethanol |
| B. | triol |
| C. | butanol |
| D. | propanol |
| Answer» B. triol | |
| 2438. |
A glue hardens when it is squeezed out of tube due to |
| A. | solidification of solvent |
| B. | the evaporation of solvent molecules |
| C. | evaporation of adhesive molecules |
| D. | evaporation of solute particles |
| Answer» C. evaporation of adhesive molecules | |
| 2439. |
Phenyl amine reacts with nitrous acid (HNO₂) to form |
| A. | diazonium salt |
| B. | nitric acid |
| C. | sulfuric acid |
| D. | hydrochloric acid |
| Answer» B. nitric acid | |
| 2440. |
Enzyme activity 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. | enzyme reacted on substrate molecule per minute |
| Answer» C. substrate molecules reacted per enzyme per minute | |
| 2441. |
Which statement is incorrect about enzymes? |
| A. | they speed up reactions without being used up |
| B. | they raise the activation energy |
| C. | they are all large molecules |
| D. | they are action-specific |
| Answer» C. they are all large molecules | |
| 2442. |
Hydrolysis of substituted amides will give the product of |
| A. | carboxylic acids only |
| B. | amines only |
| C. | alcohols |
| D. | carboxylic acids and amines |
| Answer» E. | |
| 2443. |
CH₃CONH₂ is formula for |
| A. | amine |
| B. | alkyl |
| C. | methanamide |
| D. | ethanamide |
| Answer» E. | |
| 2444. |
Avogadro's constant is the number |
| A. | 6.02 x 10²³ |
| B. | 6.03 x 10³² |
| C. | 1.2 x 10⁶ |
| D. | 1.23 x 10⁶² |
| Answer» B. 6.03 x 10³² | |
| 2445. |
Instrument use to collect ions is |
| A. | Electrometer |
| B. | ionizer |
| C. | spectrometer |
| D. | nanometer |
| Answer» B. ionizer | |
| 2446. |
Atomic mass of phosphorus is |
| A. | 11 |
| B. | 21 |
| C. | 31 |
| D. | 41 |
| Answer» D. 41 | |
| 2447. |
John Dalton evidenced existence of atoms in |
| A. | 1808 |
| B. | 1898 |
| C. | 1838 |
| D. | 1856 |
| Answer» B. 1898 | |
| 2448. |
Gas molecules differ in their diameters from distance by |
| A. | 400 |
| B. | 300 |
| C. | 600 |
| D. | 500 |
| Answer» C. 600 | |
| 2449. |
Theoretical yield is decreased by |
| A. | distillation |
| B. | reaction |
| C. | weighing |
| D. | reactants |
| Answer» B. reaction | |
| 2450. |
Number of isotopes occupied by carbon is |
| A. | three |
| B. | seven |
| C. | five |
| D. | six |
| Answer» B. seven | |