MCQOPTIONS
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MCQOPTIONS
This section includes 8247 Mcqs, each offering curated multiple-choice questions to sharpen your Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 3501. |
Hydrocynic acid (HCN) is used as an insecticide for |
| A. | controlling timber degradation by ants |
| B. | controlling poultry lice |
| C. | potato beetle |
| D. | citrus fruits |
| Answer» E. | |
| 3502. |
Molecular weight of plastics ranges from |
| A. | 5000 to 10000 |
| B. | 20000 to 250000 |
| C. | 500 to 5000 |
| D. | 106 to l09 |
| Answer» C. 500 to 5000 | |
| 3503. |
Which of the following impurities in feed water for high pressure boiler is the most detrimental ? |
| A. | Silica |
| B. | Dissolved oxygen |
| C. | Suspended salt |
| D. | Dissolved salt |
| Answer» B. Dissolved oxygen | |
| 3504. |
Which glass is usually used in optical work? |
| A. | Lead glass |
| B. | High silica (borosilicate) glass |
| C. | Photo-sensitive glass |
| D. | Fibre glass |
| Answer» D. Fibre glass | |
| 3505. |
Plasticisers are added to synthetic plastics to |
| A. | impart flexibility. |
| B. | improve workability during fabrication. |
| C. | develop new improved properties not present in the original resins. |
| D. | all (a), (b) and (c). |
| Answer» E. | |
| 3506. |
Rosin soap is added during paper manufacture to |
| A. | impart adhesive properties. |
| B. | improve opacity. |
| C. | impart resistance to penetration by liquids. |
| D. | none of these. |
| Answer» D. none of these. | |
| 3507. |
Hydrogen gas is not produced commercially (for nitrogeneous fertiliser manufacture) by |
| A. | iron-steam reaction. |
| B. | electrolysis of water. |
| C. | steam reforming of naphtha. |
| D. | its cryogenic separation from coke oven gas. |
| Answer» B. electrolysis of water. | |
| 3508. |
Carboxymethyl cellulose (CMC) is added in detergents to |
| A. | prevent redeposition of soil on cleaned surface. |
| B. | act as optical brightening agent. |
| C. | inhibit corrosion in washing machines made of aluminium, |
| D. | none of these. |
| Answer» B. act as optical brightening agent. | |
| 3509. |
Nylon-6 as compared to Nylon-66 is having higher |
| A. | hardness |
| B. | abrasion/resistance |
| C. | melting point |
| D. | none of these |
| Answer» E. | |
| 3510. |
Digestion of wood-base materials (for manufacture of pulp) is done to |
| A. | remove lignin. |
| B. | produce long fibres. |
| C. | prevent deterioration on storage. |
| D. | none of these. |
| Answer» B. produce long fibres. | |
| 3511. |
Soap cannot be used with hard water, because |
| A. | hard water contains sulphate. |
| B. | they form insoluble calcium soaps which precipitate. |
| C. | they attract back the removed dirt. |
| D. | none of these. |
| Answer» C. they attract back the removed dirt. | |
| 3512. |
Which of the following is not an antibiotic ? |
| A. | Penicillin |
| B. | Streptomycin |
| C. | Tetracyclin |
| D. | Quinine |
| Answer» E. | |
| 3513. |
The most reactive allotropic form of phosphorus is __________ phosphorus. |
| A. | red |
| B. | yellow |
| C. | violet |
| D. | black |
| Answer» C. violet | |
| 3514. |
Flux addition during smelting of ore is done to |
| A. | remove impurities/gangue. |
| B. | enhance rate of reaction. |
| C. | accelerate reduction of ore. |
| D. | separate slag from metal. |
| Answer» B. enhance rate of reaction. | |
| 3515. |
Hydrazine is used in water treatment for the removal of |
| A. | colloidal impurities |
| B. | dissolved oxygen |
| C. | turbidity |
| D. | chlorinous taste |
| Answer» C. turbidity | |
| 3516. |
Direct conversion of chemical energy into electrical energy is done in a |
| A. | magnetohydrodynamic (MHD) generator. |
| B. | fuel cell. |
| C. | fast breeder reactor. |
| D. | none of these. |
| Answer» C. fast breeder reactor. | |
| 3517. |
Which of the following is not produced commercially from sea water ? |
| A. | Magnesium & potassium compounds |
| B. | Common salt |
| C. | Bromine |
| D. | Iodine |
| Answer» E. | |
| 3518. |
__________ acid is an unsaturated fatty acid. |
| A. | Palmitic |
| B. | Oleic |
| C. | Stearic |
| D. | Oxalic |
| Answer» C. Stearic | |
| 3519. |
CO & H2 are the constituents of |
| A. | producer gas |
| B. | water gas |
| C. | coke oven gas |
| D. | all (a), (b) and (c) |
| Answer» E. | |
| 3520. |
Economics of 'Solvay Process' depends upon the efficiency of |
| A. | carbonating tower |
| B. | ammonia recovery |
| C. | ammonia recovery and size of the plant |
| D. | ammoniation of salt solution |
| Answer» D. ammoniation of salt solution | |
| 3521. |
__________ is a thermosetting plastic. |
| A. | Polyvinyl chloride |
| B. | Polythene |
| C. | Bakelite |
| D. | Teflon |
| Answer» D. Teflon | |
| 3522. |
Na2CO3 is called |
| A. | washing soda |
| B. | soda ash |
| C. | plaster of paris |
| D. | calcite |
| Answer» C. plaster of paris | |
| 3523. |
Nicotine is |
| A. | a volatile alkaloid. |
| B. | obtained by treating by-products of the tobacco processing industry. |
| C. | both (a) and (b). |
| D. | neither (a) nor (b). |
| Answer» D. neither (a) nor (b). | |
| 3524. |
Separation of fresh water from sea water can be done by the __________ operation. |
| A. | osmosis |
| B. | reverse osmosis |
| C. | absorption |
| D. | adsorption |
| Answer» C. absorption | |
| 3525. |
Na2CO3.10H2O is called |
| A. | washing soda |
| B. | soda ash |
| C. | slaked lime |
| D. | quicklime |
| Answer» B. soda ash | |
| 3526. |
Reaction of an alcohol with organic acid is called the __________ reaction. |
| A. | saponification |
| B. | esterification |
| C. | neutralisation |
| D. | acidification |
| Answer» C. neutralisation | |
| 3527. |
Ethanol amine is produced using ammonia and |
| A. | ethyl benzene |
| B. | ethylene oxide |
| C. | ethanol |
| D. | ethane |
| Answer» C. ethanol | |
| 3528. |
The most popular and common detergent i.e., alkyl benzene sulfonate (ABS) is a/an __________ detergent. |
| A. | cationic |
| B. | anionic |
| C. | amphoteric |
| D. | semi polar |
| Answer» C. amphoteric | |
| 3529. |
Reaction of calcium carbide with water produces a gas, which is used |
| A. | as an illuminant. |
| B. | for metal cutting/welding. |
| C. | both (a) & (b). |
| D. | neither (a) nor (b). |
| Answer» D. neither (a) nor (b). | |
| 3530. |
Fat dispersed in water is exemplified by |
| A. | colloids |
| B. | gel |
| C. | butter |
| D. | emulsion |
| Answer» D. emulsion | |
| 3531. |
Maleic anhydride is produced by catalytic oxidation of |
| A. | toluene |
| B. | ethyl alcohol |
| C. | naphthalene |
| D. | benzene |
| Answer» E. | |
| 3532. |
Widely used method for the conditioning of boiler feed water is the |
| A. | cold lime process |
| B. | coagulation |
| C. | hot-lime soda process |
| D. | sequestration |
| Answer» D. sequestration | |
| 3533. |
Blue colour is imparted to glass by the addition of |
| A. | FeSO |
| B. | <sub>4</sub> |
| C. | PbO |
| D. | CaO |
| E. | NaOH |
| Answer» D. CaO | |
| 3534. |
Thorium is mainly used |
| A. | for the manufacture of gas mantles. |
| B. | as a fissile fuel in a nuclear reactor. |
| C. | in the manufacture of hydrogen bomb. |
| D. | in the treatment of cancer. |
| Answer» B. as a fissile fuel in a nuclear reactor. | |
| 3535. |
During the absorption of HCl gas in water (to produce liquid HCl), the gas is kept above dew point to |
| A. | increase the rate of absorption. |
| B. | avoid corrosion. |
| C. | reduce the cooling water circulation rate. |
| D. | none of these. |
| Answer» C. reduce the cooling water circulation rate. | |
| 3536. |
Good quality of edible salt is obtained from brine by the process of |
| A. | solar evaporation |
| B. | vacuum evaporation |
| C. | freeze drying |
| D. | electrolysis |
| Answer» C. freeze drying | |
| 3537. |
Which form of sulphur is the most stable at room temperature ? |
| A. | Plastic |
| B. | Monoclinic |
| C. | Rhombic |
| D. | Flowers of sulphur |
| Answer» D. Flowers of sulphur | |
| 3538. |
Vegetable oils and fats basically differ in their |
| A. | density ranges |
| B. | physical state |
| C. | chemical composition |
| D. | chemical properties |
| Answer» C. chemical composition | |
| 3539. |
Average sulphur content in Indian pyrites is about __________ percent. |
| A. | 15 |
| B. | 35 |
| C. | 55 |
| D. | 70 |
| Answer» C. 55 | |
| 3540. |
Oil is a/an |
| A. | mixture of glycerides. |
| B. | mixture of glycerides of fatty acids. |
| C. | solid at normal temperature. |
| D. | ester of alcohols other than glycerine. |
| Answer» C. solid at normal temperature. | |
| 3541. |
Which of the following is a constituent of coffee ? |
| A. | Caffeine |
| B. | Nicotine |
| C. | Calgon |
| D. | Lignin |
| Answer» B. Nicotine | |
| 3542. |
Phthalic anhydride is made by the |
| A. | oxidation of naphthalene. |
| B. | oxidation of benzene. |
| C. | dehydrogenation of ethyl benzene. |
| D. | none of these. |
| Answer» B. oxidation of benzene. | |
| 3543. |
RDX (an explosive), which is more sensitive but less toxic than TNT, is chemically |
| A. | cyclo trimethylene trinitramine. |
| B. | trinitro resorcinol. |
| C. | cyclo tetramethylene tetranitramine. |
| D. | trinitro benzene. |
| Answer» B. trinitro resorcinol. | |
| 3544. |
Caprolactum (a raw material for nylon-6 manufacture) is produced from |
| A. | phenol |
| B. | naphthalene |
| C. | benzene |
| D. | pyridine |
| Answer» D. pyridine | |
| 3545. |
The purpose of adding Na2CO3 to water of low alkalinity is to |
| A. | permit the use of alum as a coagulant. |
| B. | increase the softening capacity of zeolite. |
| C. | facilitate easy regeneration of zeolite. |
| D. | all (a), (b) and (c). |
| Answer» B. increase the softening capacity of zeolite. | |
| 3546. |
Ca(OH)2 is called |
| A. | quicklime |
| B. | slaked lime |
| C. | limestone |
| D. | gypsum |
| Answer» C. limestone | |
| 3547. |
Percentage of uranium in carnotite ore found in Jadugoda (Jharkhand) is about |
| A. | 0.1 to 0.5 |
| B. | 1 to 5 |
| C. | 5 to 10 |
| D. | 15 to 25 |
| Answer» B. 1 to 5 | |
| 3548. |
Potassium is kept & transported under |
| A. | water |
| B. | liquid ammonia |
| C. | kerosene oil |
| D. | alcohol |
| Answer» D. alcohol | |
| 3549. |
__________ acid is the main constituent of cotton seed oil. |
| A. | Acetic |
| B. | Linoleic |
| C. | Palmitic |
| D. | Oleic |
| Answer» C. Palmitic | |
| 3550. |
Temperature during hydrogenation of oil should not be more than 200 C, otherwise it will result in |
| A. | pyrolysis of oil. |
| B. | sintering of porous catalyst. |
| C. | hydrogen embrittlement. |
| D. | all (a), (b) and (c). |
| Answer» E. | |