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.
| 2951. |
__________ glass has the lowest co-efficient of thermal expansion and hence is more heat resistant. |
| A. | Pyrex |
| B. | Soda lime |
| C. | Lead |
| D. | High silica |
| Answer» B. Soda lime | |
| 2952. |
The amount of benzene present in pure benzol is about __________ percent. |
| A. | 30 |
| B. | 50 |
| C. | 70 |
| D. | 90 |
| Answer» D. 90 | |
| 2953. |
Cumene (isopropyl benzene) is made by |
| A. | oxidation of napthalene. |
| B. | propylene alkylation of benzene. |
| C. | polymerisation of a mixture of benzene & propylene. |
| D. | none of these. |
| Answer» C. polymerisation of a mixture of benzene & propylene. | |
| 2954. |
Which of the following is not a pyrite ore? |
| A. | Celestite |
| B. | Galena |
| C. | Gypsum |
| D. | Siderite |
| Answer» E. | |
| 2955. |
Refractory bricks having high thermal conductivity is desirable, when it is to be used in the |
| A. | L.D. converter |
| B. | blast furnace |
| C. | rotary kiln |
| D. | recuperator |
| Answer» E. | |
| 2956. |
Plasticisers are added to paints to |
| A. | make it corrosion resistant. |
| B. | make glossy surface. |
| C. | give elasticity & prevent cracking of the film. |
| D. | increase atmospheric oxidation. |
| Answer» D. increase atmospheric oxidation. | |
| 2957. |
Resistance to fusion of the refractory under a steady rising temperature condition is called |
| A. | spalling |
| B. | refractoriness |
| C. | both (a) & (b) |
| D. | neither (a) nor (b) |
| Answer» C. both (a) & (b) | |
| 2958. |
Kaoline is a/an |
| A. | refractory material |
| B. | synthetic resin |
| C. | artificial abrasive |
| D. | blue pigment |
| Answer» B. synthetic resin | |
| 2959. |
Hydrogenation of edible vegetable oils |
| A. | is an exothermic reaction. |
| B. | increases their melting point. |
| C. | is done in presence of nickel catalyst. |
| D. | all (a), (b) and (c). |
| Answer» E. | |
| 2960. |
Viscosity index improver (like polystrene or polyisobutylene) is added to lubricant to |
| A. | reduce its viscosity. |
| B. | increase its viscosity. |
| C. | reduce the variation in its viscosity with temperature. |
| D. | increase the variation in its viscosity with temperature. |
| Answer» D. increase the variation in its viscosity with temperature. | |
| 2961. |
Pick out the wrong statement pertaining to solvent extraction of oil.Rate of extraction |
| A. | decreases with decrease of thickness of the flakes. |
| B. | increases with the increasing flake size keeping the flake thickness constant. |
| C. | increases Considerably with the rise of temperature. |
| D. | decreases as the moisture content of flakes increases. |
| Answer» E. | |
| 2962. |
Sea weeds are an important source of |
| A. | fluorine |
| B. | chlorine |
| C. | bromine |
| D. | iodine |
| Answer» E. | |
| 2963. |
Polythene is a/an __________ polymerisation product. |
| A. | addition |
| B. | condensation |
| C. | thermosetting |
| D. | none of these |
| Answer» B. condensation | |
| 2964. |
Catalytic oxidation-dehydrogenation of methyl alcohol produces |
| A. | formaldehyde |
| B. | phenol |
| C. | acetone |
| D. | maleic anhydride |
| Answer» B. phenol | |
| 2965. |
Carbon content of pitch (residue of coal tar distillation) is around __________ percent. |
| A. | 70 |
| B. | 55 |
| C. | 80 |
| D. | 94 |
| Answer» E. | |
| 2966. |
Sodium salt of higher molecular weight fatty acid is termed as the __________ soap. |
| A. | hard |
| B. | soft |
| C. | metallic |
| D. | lubricating |
| Answer» C. metallic | |
| 2967. |
Synthetic glycerine is produced from |
| A. | toluene |
| B. | phenol |
| C. | propylene |
| D. | naphthalene |
| Answer» D. naphthalene | |
| 2968. |
A 'unit process' is exemplified by the |
| A. | distillation |
| B. | hydrogenation of oils |
| C. | absorption |
| D. | humidification |
| Answer» C. absorption | |
| 2969. |
Commercial scale production of hydrogen from iron-steam reaction represented by, 3Fe + 3H2O = Fe3O4 + 4H2, is not practised, as it is |
| A. | a slow reaction. |
| B. | a discontinuous reaction (requiring regeneration of iron by water gas intermittently). |
| C. | still in development stage (by employing fluidised bed technique). |
| D. | all (a), (b) and (c). |
| Answer» E. | |
| 2970. |
Calcination of gypsum produces |
| A. | plaster of paris |
| B. | salt cake |
| C. | nitre cake |
| D. | lime |
| Answer» B. salt cake | |
| 2971. |
Phthalic anhydride is produced by the oxidation of |
| A. | naphthalene |
| B. | benzene |
| C. | toluene |
| D. | aniline |
| Answer» C. toluene | |
| 2972. |
Superior quality laboratory apparatus is made of the __________ glass having low thermal co-efficient of expansion & high chemical resistance. |
| A. | flint |
| B. | soda |
| C. | pyrex |
| D. | potash |
| Answer» D. potash | |
| 2973. |
Massecuite is |
| A. | used for paper making. |
| B. | used as a cattle feed. |
| C. | highly acidic in nature. |
| D. | none of these. |
| Answer» E. | |
| 2974. |
The biochemical treatment applied to sewage effluents is a process of |
| A. | dehydration |
| B. | reduction |
| C. | oxidation |
| D. | polymerisation |
| Answer» D. polymerisation | |
| 2975. |
A cane sugar factory having sugar production rate of 10 tons/day will produce about __________ tons/day of bagasse (after consumption by the factory for heating etc.). |
| A. | 1 |
| B. | 10 |
| C. | 25 |
| D. | 40 |
| Answer» C. 25 | |
| 2976. |
Sucrose content in cane sugar may be around __________ percent. |
| A. | 50 |
| B. | 70 |
| C. | 80 |
| D. | 95 |
| Answer» E. | |
| 2977. |
'Hollander beater' machine used in the paper manufacturing plant does not accomplish the task of |
| A. | final rolling out of paper. |
| B. | cutting of fibres. |
| C. | hydration of fibres. |
| D. | fibrillation of fibre. |
| Answer» B. cutting of fibres. | |
| 2978. |
Unsaturated oils compared to saturated oils have |
| A. | lower melting point & higher reactivity to oxygen. |
| B. | higher melting point & higher reactivity to oxygen. |
| C. | lower melting point & lower reactivity to oxygen. |
| D. | higher melting point & lower reactivity to oxygen. |
| Answer» B. higher melting point & higher reactivity to oxygen. | |
| 2979. |
With increase in temperature, the equilibrium constant at constant pressure (Kp) for oxidation of sulphur dioxide |
| A. | increases |
| B. | increases linearly |
| C. | decreases |
| D. | decreases linearly |
| Answer» D. decreases linearly | |
| 2980. |
Electrodeposition of metals i.e. electroplating is never done on |
| A. | metals |
| B. | alloys |
| C. | refractories |
| D. | non-metals |
| Answer» D. non-metals | |
| 2981. |
Hollander beater used during paper pulp manufacture does not facilitate the __________ of fibre. |
| A. | cutting |
| B. | fibrillation |
| C. | hydration |
| D. | strengthening |
| Answer» E. | |
| 2982. |
__________ is produced using polycondensation reaction. |
| A. | Polythene |
| B. | Phenol formaldehyde |
| C. | Poly vinyl chloride |
| D. | none of these |
| Answer» C. Poly vinyl chloride | |
| 2983. |
Raw materials required for the manufacture of __________ is acetylene and hydrochloric acid. |
| A. | phthalic anhydride |
| B. | vinyl chloride |
| C. | maleic anhydride |
| D. | dacron |
| Answer» C. maleic anhydride | |
| 2984. |
Main use of liquid nitrogen is in |
| A. | rocket propulsion. |
| B. | making gun powder. |
| C. | detergent manufacture. |
| D. | refrigerative cooling. |
| Answer» E. | |
| 2985. |
Comparing sulphate process with sulphite process, we find that __________ in the later. |
| A. | both temperature & pressure in the former is less than that |
| B. | both temperature & pressure in the former is more than that |
| C. | temperature is more in the former whereas pressure is more |
| D. | pressure is more in the former whereas temperature is less |
| Answer» C. temperature is more in the former whereas pressure is more | |
| 2986. |
Which of the following is a disacchride ? |
| A. | Sucrose |
| B. | Glucose |
| C. | Starch |
| D. | Maltose |
| Answer» B. Glucose | |
| 2987. |
Proximate analysis of coal determines its __________ content. |
| A. | moisture, ash, sulphur & volatile matter |
| B. | moisture & volatile matter |
| C. | moisture, sulphur, nitrogen & fixed carbon |
| D. | none of these |
| Answer» C. moisture, sulphur, nitrogen & fixed carbon | |
| 2988. |
Which of the following is not a food additive? |
| A. | Citric acid |
| B. | Invertage |
| C. | Benzoyl peroxide |
| D. | Ammonium chloride |
| Answer» E. | |
| 2989. |
Alum is commercially produced from |
| A. | gypsum |
| B. | feldspar |
| C. | galena |
| D. | bauxite |
| Answer» E. | |
| 2990. |
CaO is called |
| A. | quick lime |
| B. | slaked lime |
| C. | limestone |
| D. | calcite |
| Answer» B. slaked lime | |
| 2991. |
Starting raw material for the manufacture of maleic anhydride is |
| A. | <i>n</i> |
| B. | -butene |
| C. | benzene |
| D. | either (a) or (b) |
| E. | neither (a) nor (b) |
| Answer» D. either (a) or (b) | |
| 2992. |
Sulphuric acid is mainly used in the __________ industry. |
| A. | fertiliser |
| B. | steel |
| C. | paper |
| D. | paint |
| Answer» B. steel | |
| 2993. |
Alcohol percentage in molasses may be around |
| A. | 10 |
| B. | 40 |
| C. | 70 |
| D. | 85 |
| Answer» C. 70 | |
| 2994. |
Main use of hydrazine is |
| A. | as a rocket fuel |
| B. | in water treatment |
| C. | as a disinfectant |
| D. | as fire retardant |
| Answer» B. in water treatment | |
| 2995. |
In industrial nomenclature, alcohol means |
| A. | butyl alcohol |
| B. | propyl alcohol |
| C. | ethanol |
| D. | methyl alcohol |
| Answer» D. methyl alcohol | |
| 2996. |
Which of the following is the purest form of water out of the following ? |
| A. | Underground water |
| B. | Rain water |
| C. | Well water |
| D. | Lake water |
| Answer» C. Well water | |
| 2997. |
Use of water having dissolved oxygen in boilers promotes |
| A. | corrosion |
| B. | sequestration |
| C. | scale formation |
| D. | none of these |
| Answer» B. sequestration | |
| 2998. |
Yellow glycerine is made into white, using |
| A. | activated carbon |
| B. | diatomaceous earth |
| C. | bauxite |
| D. | bentonite |
| Answer» B. diatomaceous earth | |
| 2999. |
Very dilute solutions are generally used in fermentation reactions for which the optimum temperature range is __________ C. |
| A. | -5 to 0 |
| B. | 5 to 10 |
| C. | 30 to 50 |
| D. | 75 to 80 |
| Answer» D. 75 to 80 | |
| 3000. |
Brackish water which contains mostly dissolved salt, can be purified by the __________ process. |
| A. | reverse osmosis |
| B. | sand filter |
| C. | lime soda |
| D. | permutit |
| Answer» B. sand filter | |