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601. |
Gypsum is added in the manufacture of Portland cement |
A. | while mixing the raw materials |
B. | during burning in the rotary kiln |
C. | at the beginning of grinding the clinker |
D. | at the end of grinding the clinker into powder |
Answer» D. at the end of grinding the clinker into powder |
602. |
The constituent in lime which retard the slaking action and increase the rapidity of setting, is |
A. | silica |
B. | sulphate |
C. | alkalies |
D. | alumina |
Answer» A. silica |
603. |
For R.C.C. construction, the maximum size of coarse aggregate is limited to |
A. | 10 mm |
B. | 15 mm |
C. | 20 mm |
D. | 25 mm |
Answer» D. 25 mm |
604. |
Which of the following statement is correct? |
A. | The fat lime swells two to three times of its original volume during slaking. |
B. | The poor lime is of pure white colour. |
C. | The feebly hydraulic lime slakes sluggishly. |
D. | all of the above |
Answer» A. The fat lime swells two to three times of its original volume during slaking. |
605. |
The dolomite bricks are |
A. | ordinary bricks |
B. | acid refractory bricks |
C. | basic refractory bricks |
D. | neutral refractory bricks |
Answer» C. basic refractory bricks |
606. |
According to Indian standard specifications, the full strength of concrete is achieved after |
A. | 7 days |
B. | 14 days |
C. | 21 days |
D. | 28 days |
Answer» D. 28 days |
607. |
Igeous rock has |
A. | crystalline, glossy or fused texture |
B. | foliated structure which is hard and durable |
C. | layers of different composition, colour and structure |
D. | none of the above |
Answer» A. crystalline, glossy or fused texture |
608. |
Poor or lean lime |
A. | slakes rapidly with considerable evolution of heat |
B. | takes very long time to develop adequate strength |
C. | has high plasticity |
D. | none of the above |
Answer» D. none of the above |
609. |
The workability of cement concrete can be improved by |
A. | increasing the quantity of cement |
B. | increasing the proportion of coarse aggregate |
C. | increasing the quantity of sand |
D. | all of the above |
Answer» A. increasing the quantity of cement |
610. |
The liquid medium used in oil paints is |
A. | thinner |
B. | alcohol |
C. | linseed oil |
D. | turpentine |
Answer» C. linseed oil |
611. |
The good clay for making bricks is |
A. | unweathered clay |
B. | weathered clay |
C. | silted soil |
D. | black cotton soil |
Answer» B. weathered clay |
612. |
The strength of timber is maximum in the direction |
A. | parallel |
B. | perpendicular |
Answer» A. parallel |
613. |
The liquid medium used in enamel paints is |
A. | thinner |
B. | alcohol |
C. | turpentine |
D. | varnish |
Answer» D. varnish |
614. |
Granite is an example of |
A. | aqueous rocks |
B. | sedimentary rocks |
C. | metamorphic rocks |
D. | igneous rocks |
Answer» D. igneous rocks |
615. |
The sand is mixed with lime mortar to |
A. | reduce cost |
B. | reduce setting time |
C. | improve strength |
D. | prevent shrinkage and cracking |
Answer» D. prevent shrinkage and cracking |
616. |
Bituminous paint consists of bitumen dissolved in |
A. | spirit |
B. | naptha |
C. | linseed oil |
D. | either (a) or (b) |
Answer» D. either (a) or (b) |
617. |
The colour of brick depends upon the amount of iron oxide present in the clay. |
A. | Correct |
B. | Incorrect |
Answer» A. Correct |
618. |
The bricks should be burnt at temperature from |
A. | 300?C to 500?C |
B. | 500?C to 700?C |
C. | 700?C to 1000?C |
D. | 1000?C to 1200?C |
Answer» D. 1000?C to 1200?C |
619. |
The principal constituent of every kind of brick earth is alumina. |
A. | True |
B. | False |
Answer» A. True |
620. |
The thickness of lamin boards vary from |
A. | 5 to 12 mm |
B. | 12 to 15 mm |
C. | 12 to 25 mm |
D. | 25 to 30 mm |
Answer» C. 12 to 25 mm |
621. |
The purpose of seasoning of timber is to |
A. | change the direction of grains |
B. | remove voids |
C. | reduce moisture content |
D. | all of these |
Answer» C. reduce moisture content |
622. |
Rich or fat lime |
A. | slakes rapidly with considerable evolution of heat |
B. | takes very long time to develop adequate strength |
C. | has high plasticity |
D. | all of these |
Answer» D. all of these |
623. |
Le-chatelier method is used to determine |
A. | initial setting of cement |
B. | fineness of cement |
C. | soundness of cement |
D. | normal consistency of cement |
Answer» C. soundness of cement |
624. |
The fuel generally used for burning limestone is |
A. | coal |
B. | charcoal |
C. | firewood |
D. | any one of these |
Answer» D. any one of these |
625. |
The specific gravity of sandstone is |
A. | 1.1 to 1.8 |
B. | 1.8 to 2.65 |
C. | 2.65 to 2.95 |
D. | 2.95 to 3.4 |
Answer» C. 2.65 to 2.95 |
626. |
The commonly used cement in cement paints is |
A. | white cement |
B. | Portland cement |
C. | alumina cement |
D. | rapid hardening cement |
Answer» A. white cement |
627. |
The most powerful explosive used in blasting is |
A. | blasting power |
B. | dynamite |
C. | gun cotton |
D. | cordite |
Answer» C. gun cotton |
628. |
The quarrying of stone by the method of wedging is successfully carried out in |
A. | sandstones |
B. | limestones |
C. | marbles |
D. | all of these |
Answer» D. all of these |
629. |
The indentation marks left on bricks during the process of moulding, are known as |
A. | fillets |
B. | frogs |
C. | projections |
D. | marks |
Answer» B. frogs |
630. |
Efflorescence is caused if |
A. | the alkaline salt is present in the bricks |
B. | the clay used for making bricks contain pyrite |
C. | the water used for pugging the clay contains gypsum |
D. | all of the above |
Answer» D. all of the above |
631. |
The moisture content in timber for framework should not exceed |
A. | 5% |
B. | 10% |
C. | 15% |
D. | 20% |
Answer» C. 15% |
632. |
The strength of white cement is |
A. | equal to |
B. | less than |
C. | greater than |
Answer» B. less than |
633. |
The thinner used for oil paints is |
A. | water |
B. | turpentine |
C. | carbon tetrachloride |
D. | any one of these |
Answer» B. turpentine |
634. |
The bitumen paints are used for providing |
A. | rough |
B. | smooth |
C. | protective |
Answer» C. protective |
635. |
The slump test of concrete is used to measure its |
A. | consistency |
B. | tensile and compressive strength |
C. | impact value |
D. | homogeneity |
Answer» A. consistency |
636. |
The bulking of sand |
A. | increases |
B. | decreases |
Answer» A. increases |
637. |
The percentage of silica in a good brick clay should vary from |
A. | 20 to 30% |
B. | 30 to 40% |
C. | 40 to 50% |
D. | 50 to 60% |
Answer» D. 50 to 60% |
638. |
The sedimentary rocks are formed due to |
A. | solidification of molten mass lying below or above the earth surface |
B. | gradual deposition of materials like sand, clay, etc., generally by setting water |
C. | alteration of original structure under heat and excessive pressure |
D. | none of the above |
Answer» B. gradual deposition of materials like sand, clay, etc., generally by setting water |
639. |
In order to dry the quarry sap of a freshly quarried slone, it should be exposed to open air for a period of |
A. | one month |
B. | four months |
C. | six to twelve months |
D. | two years |
Answer» C. six to twelve months |
640. |
The metallic oxide used in the form of powder in a paint is called |
A. | extender |
B. | base |
C. | vehicle |
D. | drier |
Answer» B. base |
641. |
A first class brick should not absorb water more than |
A. | 10% |
B. | 15% |
C. | 20% |
D. | 25% |
Answer» C. 20% |
642. |
The colour of granite is |
A. | grey |
B. | green |
C. | brown |
D. | all of these |
Answer» D. all of these |
643. |
The stone used for the construction of curved or ornamental work should be soft. |
A. | Right |
B. | Wrong |
Answer» A. Right |
644. |
Moorum is a decomposed laterite and has deep brown or red colour. |
A. | Yes |
B. | No |
Answer» A. Yes |
645. |
The rocks formed due to alteration of original structure under heat and excessive pressure are called metamorphic rocks. |
A. | Agree |
B. | Disagree |
Answer» A. Agree |
646. |
The silica in Portland cement should be |
A. | 10 to 20% |
B. | 20 to 25% |
C. | 25 to 40% |
D. | 40 to 60% |
Answer» B. 20 to 25% |
647. |
Excess pf alumina in the clay |
A. | makes the brick brittle and weak |
B. | makes the brick crack and warp on drying |
C. | changes colour of the brick from red to yellow |
D. | improves impermeability and durability of the brick |
Answer» B. makes the brick crack and warp on drying |
648. |
The final setting time of ordinary cement should not be more than |
A. | 2 hours |
B. | 4 hours |
C. | 8 hours |
D. | 10 hours |
Answer» D. 10 hours |
649. |
The brick earth is derived by the disintegration of |
A. | igneous |
B. | metamorphic |
Answer» A. igneous |
650. |
The central part of a tree is called |
A. | heart wood |
B. | pith |
C. | sap wood |
D. | cambium layer |
Answer» B. pith |
651. |
Which of the following is an example of silicious rock? |
A. | Granite |
B. | Gneiss |
C. | Quartzite |
D. | all of these |
Answer» D. all of these |
652. |
During the process of burning limestone, clay forms certain compound which |
A. | gives hydraulic lime |
B. | gives power of quick setting |
C. | does not allow to be dissolved in the outside water when used in damp situations |
D. | all of the above |
Answer» D. all of the above |
653. |
The clinker is formed at a temperature of |
A. | 500?C |
B. | 1000?C |
C. | 1200?C |
D. | 1500?C |
Answer» D. 1500?C |
654. |
The ultimate strength of cement is provided by |
A. | silica |
B. | di-calcium silicate |
C. | tri-calcium silicate |
D. | tri-calcium aluminate |
Answer» B. di-calcium silicate |
655. |
The slaking of moderately hydraulic lime is scarcely noticeable. |
A. | Yes |
B. | No |
Answer» B. No |
656. |
The durability of concrete is proportional to |
A. | sand content |
B. | water-cement ratio |
C. | cement-aggregate ratio |
D. | aggregate-water ratio |
Answer» C. cement-aggregate ratio |
657. |
The rate of hydration and hydrolysis of cement depends upon its |
A. | soundness |
B. | fineness |
C. | setting time |
D. | tensile strength |
Answer» B. fineness |
658. |
The expansion of cement should not exceed |
A. | 5 mm |
B. | 10 mm |
C. | 15 mm |
D. | 20 mm |
Answer» B. 10 mm |
659. |
Distemper is used on |
A. | brick walls |
B. | concrete surfaces |
C. | plastered surfaces exposed to weather |
D. | plastered surfaces not exposed to weather |
Answer» D. plastered surfaces not exposed to weather |
660. |
Slate in the form of tiles is used |
A. | for paving |
B. | as road metal |
C. | as an excellent roof covering material |
D. | for the manufacture of cement |
Answer» C. as an excellent roof covering material |
661. |
A good Portland cement when tested for fineness, the percentage of residue left after sieving in 90 micron IS sieve should not exceed 10 percent. |
A. | True |
B. | False |
Answer» A. True |
662. |
Lime is used |
A. | as a matrix for concrete |
B. | for plastering walls, ceilings etc. |
C. | for improving soil for agricultural purposes |
D. | all of the above |
Answer» D. all of the above |
663. |
For the construction of retaining walls, a |
A. | soft |
B. | hard |
C. | heavy |
Answer» C. heavy |
664. |
Quick lime is a |
A. | carbonate of lime |
B. | oxide of calcium |
C. | product left immediately after the calcination of pure limestone |
D. | lime quickly treated with water |
Answer» C. product left immediately after the calcination of pure limestone |
665. |
Enamel paint is made by adding |
A. | white lead in varnish |
B. | bitumen in varnish |
C. | white lead in lacquer |
D. | zinc white in spirit |
Answer» A. white lead in varnish |
666. |
Jhama bricks are |
A. | well burnt having smooth and even surface |
B. | slightly over burnt having rough surface |
C. | under burnt and can be easily broken |
D. | over burnt with irregular shape |
Answer» D. over burnt with irregular shape |
667. |
The pigment in paints is mixed to give desired |
A. | smoothness |
B. | colour |
C. | appearance |
D. | durability |
Answer» B. colour |
668. |
Granite is mainly composed of |
A. | quartz and mica |
B. | felspar and mica |
C. | quartz and felspar |
D. | quartz, felspar and mica |
Answer» D. quartz, felspar and mica |
669. |
The coefficient of linear expansion of concrete is almost the same as that of steel. |
A. | Correct |
B. | Incorrect |
Answer» A. Correct |
670. |
For one cubic metre of brick masonry, the number of bricks required are |
A. | 400 |
B. | 450 |
C. | 500 |
D. | 550 |
Answer» D. 550 |
671. |
The defect caused by imperfect seasoning, is called |
A. | wet rot |
B. | dry rot |
C. | honeycombing |
D. | cup shake |
Answer» C. honeycombing |
672. |
A good quality cement should have higher percentage of |
A. | silica |
B. | free lime |
C. | di-calcium silicate |
D. | tri-calcium silicate |
Answer» D. tri-calcium silicate |
673. |
The compressive strength of perforated bricks should not be less than |
A. | 4 MN/m2 |
B. | 5 MN/m2 |
C. | 6 MN/m2 |
D. | 7 MN/m2 |
Answer» D. 7 MN/m2 |
674. |
The average out-turn of first class bricks in kiln burning is |
A. | 50 to 60% |
B. | 60 to 70% |
C. | 70 to 80% |
D. | 80 to 90% |
Answer» D. 80 to 90% |
675. |
Gneiss is chemically classified as |
A. | calcareous rock |
B. | argillaceous rock |
C. | silicious rock |
D. | none of these |
Answer» C. silicious rock |
676. |
The chief ingredient of a paint is |
A. | alcohol |
B. | drier |
C. | oil |
D. | pigment |
Answer» D. pigment |
677. |
The setting and hardening of cement paste is mainly due to the hydration and hydrolysis of |
A. | tri-calcium silicate |
B. | di-calcium silicate |
C. | tri-calcium aluminate |
D. | all of these |
Answer» D. all of these |
678. |
The process of adding the required quantity of water to quick lime in order to convert it into hydrated lime, is known as |
A. | calcination |
B. | hydration |
C. | slaking |
D. | quenching |
Answer» C. slaking |
679. |
The fineness of cement is tested by |
A. | air-permeability method |
B. | Le-chatelier method |
C. | Vicat's apparatus |
D. | all of these |
Answer» A. air-permeability method |
680. |
The standard size of a masonry brick is 20 cm x 10 cm x 10 cm |
A. | Agree |
B. | Disagree |
Answer» B. Disagree |
681. |
Which of the following statement is correct? |
A. | The sand used for making mortar should be fine. |
B. | The rounded grains of sand produce a strong mortar. |
C. | The mortar made with coarse sand is stronger than the one made with fine stand. |
D. | all of the above |
Answer» C. The mortar made with coarse sand is stronger than the one made with fine stand. |
682. |
When quarrying is to be done in hard stone and compact rocks, the usual method of quarrying is |
A. | by wedging |
B. | by channelling machine |
C. | by blasting |
D. | all of these |
Answer» C. by blasting |
683. |
The soundness of cement is tested by |
A. | air permeability method |
B. | Le-chatelier method |
C. | Vicat's apparatus |
D. | all of these |
Answer» B. Le-chatelier method |
684. |
The wood generally used for railway sleepers is |
A. | mango |
B. | kail |
C. | babul |
D. | deodar |
Answer» B. kail |
685. |
Which of the following statement is correct? |
A. | Stains used as paints have synthetic pigments. |
B. | Stucco paints contain polyvinyl acetate. |
C. | The solvent used in distempers is turpentine. |
D. | all of the above |
Answer» B. Stucco paints contain polyvinyl acetate. |
686. |
Gun cotton is made by saturating cotton with nitric acid. |
A. | Agree |
B. | Disagree |
Answer» A. Agree |
687. |
The maximum water-cement ratio for durable concrete is |
A. | 0.2 |
B. | 0.4 |
C. | 0.6 |
D. | 0.8 |
Answer» D. 0.8 |
688. |
According to Indian standard specifications, the concrete should be cured under a humidity of |
A. | 30% |
B. | 50% |
C. | 70% |
D. | 90% |
Answer» D. 90% |
689. |
The durability of cement concrete is usually improved by |
A. | increasing the quantity of coarse sand |
B. | increasing the quantity of cement |
C. | decreasing the water-cement ratio |
D. | decreasing the proportion of fine aggregate |
Answer» B. increasing the quantity of cement |
690. |
The specific gravity of stone should not, in any case be less than |
A. | 1 |
B. | 1.5 |
C. | 2 |
D. | 2.5 |
Answer» D. 2.5 |
691. |
The burning of bricks in kilns is complete within |
A. | 12 |
B. | 24 |
C. | 48 |
D. | 96 |
Answer» B. 24 |
692. |
A fine-grained granite |
A. | offers higher resistance to weathering |
B. | can be easily polished and worked |
C. | is used for exterior facing of buildings |
D. | all of these |
Answer» D. all of these |
693. |
Excess of silica in the clay |
A. | makes the brick brittle and weak |
B. | makes the brick crack and wrap on drying |
C. | changes the colour of the brick from red to yellow |
D. | improves impermeability and durability of the brick |
Answer» A. makes the brick brittle and weak |
694. |
For railway ballast, the stone should be |
A. | soft with a uniform texture |
B. | hard, heavy, strong and durable |
C. | hard, tough, resistant to abrasion and durable |
D. | hard, dense, durable, tough and easily workable |
Answer» D. hard, dense, durable, tough and easily workable |
695. |
The crushing strength of a stone depends upon its |
A. | texture |
B. | specific gravity |
C. | workability |
D. | both (a) and (b) |
Answer» D. both (a) and (b) |
696. |
The strength of cement concrete is directly proportional to cement-water ratio. |
A. | Agree |
B. | Disagree |
Answer» A. Agree |
697. |
Lime occurs in a free state in nature. |
A. | True |
B. | False |
Answer» B. False |
698. |
The best primer used for structural steel work is |
A. | white lead |
B. | red lead |
C. | zinc oxide |
D. | iron oxide |
Answer» B. red lead |
699. |
The size of mould for bricks should be |
A. | equal to |
B. | smaller than |
C. | larger than |
Answer» C. larger than |
700. |
The paint which has high reflective property is |
A. | cellulose paint |
B. | casein paint |
C. | bronze paint |
D. | enamel paint |
Answer» C. bronze paint |
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