MCQOPTIONS
Saved Bookmarks
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.
| 7801. |
Plasticisers are added to polymers to improve their |
| A. | tensile strength. |
| B. | softness & flexibility. |
| C. | acid resistance. |
| D. | alkali resistance. |
| Answer» C. acid resistance. | |
| 7802. |
Polymerisation reactor used in the production of styrene butadiene rubber (SBR) is made of |
| A. | stainless steel or glass lined steel |
| B. | nickel clad steel |
| C. | high silicon cast iron |
| D. | aluminium |
| Answer» B. nickel clad steel | |
| 7803. |
The softest material in Mho's scale (for measuring hardness) is |
| A. | talc |
| B. | gypsum |
| C. | rubber |
| D. | none of these |
| Answer» B. gypsum | |
| 7804. |
Graphite is corroded by |
| A. | sulphuric acid (10%) |
| B. | sea water |
| C. | hydrochloric acid |
| D. | none of these |
| Answer» E. | |
| 7805. |
Carbon is present in the uncombined (graphitic) form in case of |
| A. | cast iron |
| B. | steel |
| C. | ferroalloy |
| D. | none of these |
| Answer» B. steel | |
| 7806. |
Among the tin containing alloys, __________ consumes the maximum amount of tin. |
| A. | solder |
| B. | white metal |
| C. | pewter matal |
| D. | bronzes |
| Answer» B. white metal | |
| 7807. |
The hardest material just prior to diamond in Mhos scale is |
| A. | topax |
| B. | carborundum |
| C. | corrundum |
| D. | calcite |
| Answer» D. calcite | |
| 7808. |
The damage/deterioration of metals by the __________ action of fluids is called 'erosion'. |
| A. | abrasive |
| B. | corrosive |
| C. | both (a) & (b) |
| D. | neither (a) nor (b) |
| Answer» B. corrosive | |
| 7809. |
__________ of a material results, when its strength is increased & ductility is decreased by heating at a relatively lower temperature after cold working. |
| A. | Solid solution hardening |
| B. | Screw dislocation |
| C. | Strain ageing |
| D. | Twinning |
| Answer» D. Twinning | |
| 7810. |
Which of the following metals in not used for coating of the base metal to guard it against corrosion ? |
| A. | Lead |
| B. | Cadmium |
| C. | Magnesium |
| D. | Aluminium |
| Answer» D. Aluminium | |
| 7811. |
Aqueous nitric acid is stored in __________ vessel. |
| A. | plain carbon steel |
| B. | stainless steel |
| C. | cast iron |
| D. | thermosetting plastic material |
| Answer» D. thermosetting plastic material | |
| 7812. |
A metallic alloy in which one of the constituent metal is __________ , is called an amalgam. |
| A. | zinc |
| B. | mercury |
| C. | lead |
| D. | tin |
| Answer» C. lead | |
| 7813. |
An alloy of iron containing 4% carbon is called |
| A. | high carbon steel |
| B. | wrought iron |
| C. | mild steel |
| D. | none of these |
| Answer» E. | |
| 7814. |
At 100% relative humidity, the dew point temperature of moist air is |
| A. | less than the wet bulb temperature. |
| B. | more than the wet bulb temperature. |
| C. | equal to the wet bulb temperature. |
| D. | equal to the ambient temperature. |
| Answer» C. equal to the wet bulb temperature. | |
| 7815. |
The excess air required for the combustion of pulverised coal is of the order of about __________ percent. |
| A. | 5 |
| B. | 15 |
| C. | 30 |
| D. | 45 |
| Answer» C. 30 | |
| 7816. |
While the bin cards are used in the effective stores management, the queing theory is associated with the __________ time. |
| A. | waiting |
| B. | idle |
| C. | inspection |
| D. | tool replacement |
| Answer» B. idle | |
| 7817. |
Diameter of the rivet to be provided on a 20 mm. thick boiler plate will be __________ mm. |
| A. | 10 |
| B. | 20 |
| C. | 30 |
| D. | 40 |
| Answer» E. | |
| 7818. |
The delivery pressure of boiler feed water pump compared to the boiler steam pressure is |
| A. | same |
| B. | slightly less |
| C. | slightly more |
| D. | much more |
| Answer» D. much more | |
| 7819. |
__________ of austenite decreases the hardenability in steel. |
| A. | Fine grains |
| B. | Coarse grains |
| C. | Homogeneity |
| D. | Dissolved elements (except cobalt) |
| Answer» E. | |
| 7820. |
A jig is used while __________ a hole. |
| A. | boring |
| B. | counter boring |
| C. | drilling |
| D. | enlarging |
| Answer» D. enlarging | |
| 7821. |
Steel pipes are normally manufactured by __________ process. |
| A. | extrusion |
| B. | cold working |
| C. | forging |
| D. | electroforming |
| Answer» B. cold working | |
| 7822. |
Polymorphism is not exhibited by |
| A. | carbon |
| B. | iron |
| C. | phosphorous |
| D. | none of these |
| Answer» E. | |
| 7823. |
Rubber lined vessels are corroded by the action of |
| A. | aqua regia |
| B. | chloroform |
| C. | sulphuric acid (95%) |
| D. | all (a), (b) and (c) |
| Answer» E. | |
| 7824. |
Tin base and lead base alloys are used for bearing materials. Tin compared to lead has lower |
| A. | price. |
| B. | corrosion resistance. |
| C. | thermal conductivity. |
| D. | abundant availability. |
| Answer» E. | |
| 7825. |
Metal at the top of the electromotive series is |
| A. | least active |
| B. | most stable |
| C. | most active |
| D. | most noble |
| Answer» D. most noble | |
| 7826. |
Fatigue failure of a material may occur, when it is subjected to __________ stress. |
| A. | fluctuating |
| B. | tensile |
| C. | compressive |
| D. | torsion |
| Answer» B. tensile | |
| 7827. |
Presence of even very minute amount (say 0.1%) of __________ in copper, reduces its electrical conductivity very seriously. |
| A. | bismuth |
| B. | arsenic |
| C. | antimony |
| D. | both (b) and (c) |
| Answer» E. | |
| 7828. |
High speed steel should have high |
| A. | toughness |
| B. | wear resistance |
| C. | hardenability |
| D. | both(b) & (c) |
| Answer» E. | |
| 7829. |
The presence of impurities in iron |
| A. | increases its melting point. |
| B. | does not affect its melting point. |
| C. | decreases its melting point. |
| D. | makes it malleable. |
| Answer» D. makes it malleable. | |
| 7830. |
Which of the following alloy steels has the energy saving properties making it suitable for use in electrical machines ? |
| A. | Silicon steel |
| B. | Chromium steel |
| C. | Molybdenum steel |
| D. | None of these |
| Answer» B. Chromium steel | |
| 7831. |
Vycor, a widely used material for making 'thermal wells' in temperature measurement, is a |
| A. | cermet |
| B. | glass |
| C. | thermosetting plastic |
| D. | metallic alloy |
| Answer» C. thermosetting plastic | |
| 7832. |
Compressive strength of wood is usually more along the grains. The tenile strength of wood as compared to that of steel is about |
| A. | half |
| B. | one third |
| C. | one fifth |
| D. | one twelfth |
| Answer» D. one twelfth | |
| 7833. |
Ball bearings are generally made of |
| A. | plain carbon steel |
| B. | chrome carbon steel |
| C. | stainless steel |
| D. | malleable cast iron |
| Answer» C. stainless steel | |
| 7834. |
Maximum carbon content in any variety of steel can be upto 1.3%. Steel containing 0.4% Carbon is not used for making |
| A. | nuts |
| B. | bolts |
| C. | chiesels |
| D. | studs |
| Answer» D. studs | |
| 7835. |
Which is the purest form of iron ? |
| A. | Wrought iron |
| B. | Pig iron |
| C. | Bessemer iron |
| D. | Grey iron |
| Answer» B. Pig iron | |
| 7836. |
Spark plugs, ignition tubes and electrodes are made of nickel __________ alloys. |
| A. | beryllium |
| B. | manganese |
| C. | copper |
| D. | iron |
| Answer» C. copper | |
| 7837. |
A steel alloy containing 36% nickel is called __________ , which has a zero co-efficient of expansion. |
| A. | austenitic stainless steel |
| B. | heat resisting steel |
| C. | invar |
| D. | high speed steel |
| Answer» D. high speed steel | |
| 7838. |
Cold worked steel parts are normally subjected to |
| A. | normalising |
| B. | hardening |
| C. | annealing |
| D. | shot peening |
| Answer» D. shot peening | |
| 7839. |
Which of the following is not used as the ceramic material in 'cermets' ? |
| A. | Silicides |
| B. | Oxides |
| C. | Carbides |
| D. | Nitrides |
| Answer» E. | |
| 7840. |
For handling sulphuric acid of 95% strength, the suitable material of construction for pipes is |
| A. | stainless steel |
| B. | cast iron |
| C. | aluminium |
| D. | nickel |
| Answer» C. aluminium | |
| 7841. |
Which of the following is not an alloy of tin? |
| A. | White-bearing metal |
| B. | Pewter type metal |
| C. | Soft solder |
| D. | German silver |
| Answer» E. | |
| 7842. |
Which of the following is a light alloy ? |
| A. | Monel metal |
| B. | Dow metal |
| C. | German silver |
| D. | Babbit metal |
| Answer» C. German silver | |
| 7843. |
Thermosetting resins are those polymers, which |
| A. | do not increase in plasticity with rise in temperature. |
| B. | allow slip to occur between molecules. |
| C. | do not take on a permanent set. |
| D. | none of these. |
| Answer» B. allow slip to occur between molecules. | |
| 7844. |
Strain hardening effect in metals subjected to cold working is due to the __________ mechanism. |
| A. | slip |
| B. | fracture |
| C. | winning |
| D. | dislocation |
| Answer» E. | |
| 7845. |
__________ number determines whether the fluid flow in an open channel is supercritical, critical or sub-critical. |
| A. | Mach |
| B. | Reynolds |
| C. | Froude |
| D. | Weber |
| Answer» D. Weber | |
| 7846. |
The material of construction of bearings is |
| A. | cast iron |
| B. | babbit metal |
| C. | pig iron |
| D. | steel |
| Answer» C. pig iron | |
| 7847. |
Hastelloy comprises of |
| A. | copper and tin |
| B. | copper and nickel |
| C. | molybdenum and nickel |
| D. | lead and tin |
| Answer» D. lead and tin | |
| 7848. |
Metalloid is |
| A. | an element, which exhibits the properties of both metal & non metal. |
| B. | highly electronegative in nature. |
| C. | an alloy. |
| D. | all (a), (b) & (c) |
| Answer» B. highly electronegative in nature. | |
| 7849. |
Babbit metal (used for making bearings) comprises of |
| A. | mainly tin (85%) and lead. |
| B. | saw dust and iron dust mixture. |
| C. | zinc and aluminium. |
| D. | copper and aluminium. |
| Answer» B. saw dust and iron dust mixture. | |
| 7850. |
Hydrochloric acid is stored in a __________ steel vessel. |
| A. | lead lined |
| B. | rubber lined |
| C. | glass lined |
| D. | stainless |
| Answer» C. glass lined | |