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Right OPTION is (d) Broken and examined

Easiest EXPLANATION: A BRICK is broken to expose the surface.It should be uniform, compact, FREE from voids.

Correct CHOICE is (b) False

Explanation: Pan TILES are CURVED in section.Pot tiles are semi-circular in section and taper ALONG the length.

The correct choice is (c) Economic ALTERNATIVE to clay bricks

Easy EXPLANATION: FALG bricks are composed of flyash, LIME and gypsum.It utilises the waste from thermal POWER plants and hence it is an economic alternative to clay bricks.

The CORRECT ANSWER is (b) Latin word CALCINARE

To explain I would say: Calcinare is a Latin word.It means to burn LIME, hence calcination is accorded to as burning of Lime.

Correct option is (a) SMALL thickness

The explanation is: FLAKY PARTICLES have a small thickness COMPARED to the dimensions of other parameters that is width and length.

The correct option is (c) Fast CONSTRUCTION

Explanation: Standard size of hollow BRICK is 39x19x30cm COMPARED to 19x9x9cm of normal red brick. It is BIGGER in size and helps in speedy construction.

The CORRECT OPTION is (d) Seal end of pipe line

The explanation: PVC PLUG and cap are USED to seal the end of a pipeline. They have a threaded end and the other end is closed.

Correct ANSWER is (b) Soda-lime glass

Explanation: Soda-lime glass accounts for about 90% of the manufactured glass. It is inexpensive, chemically stable, hard and WORKABLE.

Right answer is (d) APPLICATION, PRODUCTION method and chemical composition

The explanation: They differ in the application (flat glass is used for WINDOW PANES and container glass for glass containers), production method (float process is used for windows and pressing for containers), chemical composition (flat glass has higher magnesium OXIDE and sodium oxide than container glass).

Correct option is (a) Apply PAINT without touching surface

Explanation: Spray painting delivers a SMALL amount of paint and GIVES the surface a smooth finish.Rollers are USED to reach high areas.

Correct answer is (c) Multi grade

For explanation I would say: It consists of aggregates of more than one single grade.It ideally contains particles of SIZE 4.75mm and above in a proportionate AMOUNT.

The correct option is (d) When paint is ready to use

For explanation I would say: Driers when ADDED to paint, will START doing their ACTION as a catalyst immediately.This will LEAD to hardening of paint, DECREASING workability.

The correct answer is (c) DURALUMIN

Explanation: Duralumin consists of 95% aluminium, 4% COPPER, 0.5% magnesium and 0.5% manganese.It is WIDELY USED in aircraft manufacturing due to its light weight and high strength.

Right option is (d) Onyx

The best explanation: Onyx has a creamy, pearl LIKE look.It is not commonly USED for flooring but can be EMPLOYED for skirting around bathtubs and mosaics.

Correct CHOICE is (c) 5

To explain I would SAY: The 5 types are WATER seasoning, boiling, chemical seasoning, electrical seasoning and kiln seasoning.

Right answer is (C) Natural drying

Best explanation: Natural drying employs WORKERS and it is more economical in India than USING ARTIFICIAL driers.Hot floor drier and tunnel drier are types of artificial drying METHOD.

The correct option is (d) Providing support in R.C.C structures

Explanation: Steel BARS and RODS are used WIDELY in R.C.C structures.Steel PLATES find application in structural steel works.

Right option is (b) 28 DAYS

To elaborate: Cement blocks are PREPARED to test their compressive strength.With proper curing and ATTAINING strength, these can be tested.It requires 28 days to fully cure and ATTAIN the strength of required grade, say 43 N/mm^2 for grade 43 OPC.

The CORRECT OPTION is (b) False

The best explanation: High alumina CEMENT is obtained by ADDING 55% bauxite and 35-45% lime.It hardens rapidly and it is costlier.It cannot be used for massive CONCRETE work.

The correct ANSWER is (d) Acts as flux

The best explanation: Iron oxide acts as a flux, in addition to being RESPONSIBLE for imparting COLOUR to cement.If the temperature goes higher, then iron oxide reacts with aluminium and calcium and results in the formation of calcium aluminate FERRITE.

Right ANSWER is (c) FUEL efficiency

Explanation: Almost 95% of calcination is completely over in the precalciner, if 50-60% of fuel is added to this chamber.Hence fuel in the kiln required is less.

Right choice is (d) 32 litres

To explain I WOULD say: Quantity of water to be added DEPENDS on composition of lime, method of slaking, FORM of lime required (dry or putty).PRACTICALLY water up to 100 litres can also be added for lime putty.

The correct answer is (a) DECOMPOSITION of Calcium Chlorate

To elaborate: All the other process leads to BURNING or thermal decomposition of lime in some forms.Calcium Chlorate decomposes into calcium chloride and OXYGEN.

Right CHOICE is (d) Feebly Hydraulic Lime

For EXPLANATION I WOULD say: Hydraulic Lime slakes at a slower rate than Pure Lime.It is subdivided into three – Feebly Hydraulic, Moderately Hydraulic (1-2 HRS) and Eminently Hydraulic (slakes with DIFFICULTY).

The CORRECT answer is (c) Plastering

For explanation I would say: Plastering is the act of applying a LAYER of plaster over a WALL. It gives the wall a smooth and decorative appearance. HENCE, for achieving the smoothness, FINE grained sand is employed.

Correct option is (a) True

The best EXPLANATION: Stone MASONRY is done with lime based binders.These provide compressive strength SUFFICIENT for use in load bearing walls of 3-5 STOREY heights.They can considerably reduce the AMOUNT of cement.

The CORRECT option is (a) True

Easiest explanation: It is a not a single COMPOUND and it is very DIFFICULT to give any particular CHEMICAL FORMULA for it.

The CORRECT CHOICE is (c) Buna-S

The best explanation: It is sold under different names.Some of them are neoprene, buna-s, hypalon, silastic, etc.GUM RUBBER, caoutchouc and gum elastic are names used for natural rubber.

The correct answer is (B) 1920-2160 kg/cum

The explanation is: 2630-2760 kg/cum is a density of granite.1600 kg/cum is of loose GRAVEL and 1200 kg/cum is that of brick ballast.

Correct CHOICE is (a) E=W1/W2

To EXPLAIN I would say: ELONGATION index is obtained as a percentage.E=w1/w2 where w1 is the weight of particles retained in length gauge and w2 is the weight of test sample.

The CORRECT choice is (c) Tractor

For explanation: Large forest contains a huge number of trees.It will be difficult, time CONSUMING to cut them using CHISEL, AXE or chainsaw.So specially designed tractor with cutters and GRABBERS are used to fell trees.

The correct choice is (a) Elastic

For explanation I would say: Timber should be elastic i.e., it should retain shape when LOAD causing deformation is removed.A good timber should have straight, compact fibres, MODERATE COST and HIGH density.

The correct ANSWER is (a) 3.5 N/mm^2

To ELABORATE: As per IS codes, the minimum CRUSHING strength of first class brick is 10.5 N/mm^2, second class is 7 N/mm^2 and third class is 3.5 N/mm^2.

The CORRECT answer is (b) Lime

The BEST explanation: Cement contains about 60-65% of lime.Silica CONSTITUTES 17-25%, ALUMINA 3-8% and magnesia 1-3%.

Right option is (d) To accommodate hot gases of combustion

To ELABORATE: The kiln has TWO sections – upper one to store LIMESTONE and LOWER one to collect lime.As burning continues, hot gases are releases.These are then accommodated in the middle portion.

The CORRECT answer is (B) Lime-MILK

The explanation is: Lime is gradually added to water present in the first TANK and stirred continuously.It results in FORMATION of milk of lime, which is allowed to falls through a sieve into the second tank.

Correct option is (a) 2

To elaborate: Two tanks are used for TANK slaking method.ONE is CONSTRUCTED 45CM deep, at a higher LEVEL.Other one adjoining the first one is constructed 60-75cm deep, at lower level.