A 1st class brick immersed in water for 24 hours, should not absorb water (by weight) more than
10 %
15 %
20 %
25 %
Correct Answer :
C. 20 %
Related Questions
The steel used for rails under heavy traffic and on sharp curves, is
Nickel steel
Chrome steel
Manganese steel
Vanadium steel
Granite mainly composed of quartz and feldspar particles, is obtained from
Sedimentary rocks
Metamorphic rocks
Igneous rocks
All the above
The frog of the brick in a brick masonry is generally kept on
Bottom face
Top face
Shorter side
Longer side
Which of the following stone is best suited for construction of piers and abutments of a railway bridge?
Granite
Sand stone
Lime stone
Quartzite
Asphalt is obtained from
Petroleum distillation
Bitumen distillation
Plastic distillation
None of these
After storage, the strength of cement
Decreases
Increases
Remains same
May increase or decrease
The steel which contains fissures and cavities, is manufactured by
Cementation process
Crucible process
Bessemer process
Open hearth process
A stone is rejected if it absorbs water more than
5 %
10 %
15 %
20 %
First class timber has an average life of
Less than one year
1 to 5 years
5 to 10 years
More than 10 years
The most commonly used synthetic abrasive is
Aluminium carbide
Boric acid
Silicon
All of these
Pick up the incorrect statement from the following:
Plastics are chemical resistant
Plastics are durable
Plastics are ductile
Plastics are excellent electric insulators
Teak wood is suitable for
Sports articles
Furnitures
Railway sleepers
All the above
The pigment used in paints for corrosive resistance, is
White lead
Ferrous oxide
Zinc white
Red lead
The frog of a brick is normally made on its
Top face
Bottom face
Longer face
Shorter side
Pick up the volcanic rock from the following:
Granite
Dolerite
Basalt
All the above
For construction of structures under water, the type of lime used, is
Hydraulic lime
Fat lime
Quick lime
Pure lime
The material generally not used as extender in paints, is
Powdered silica
Gypsum
Talc
Zinc white
Pick up the correct statement from the following:
Rusting is caused due to combined action of air, moisture and carbon dioxide
During rusting, first ferrous bicarbonates are formed
On further oxidation ferrous bicarbonates get converted to ferric bicarbonates
All the above
Slate is formed by metamorphic action on
Shale
Lime stone
Sand stone
Granite
The main function of alumina in brick earth is
To impart plasticity
To make the brick durable
To prevent shrinkage
To make the brick impermeable
Le-Chatelier's device is used for determining the
Setting time of cement
Soundness of cement
Tensile strength of cement
Compressive strength of cement
Which of the following gradients exerts maximum influence on properties of steel?
Iron
Carbon
Manganese
Sulphur
Quartzite, a metamorphic stone is
Hard
Brittle
Crystalline
All the above
Laterite is a/an
Volcanic rock
Argillaceous rock
Calcareous rock
Siliceous rock
Chlorite, a green colour mineral is mainly derived from the decomposition of
Augite
Biotite
Hornblende
All of these
The ultimate tensile strength of structural mild steel is about
160 N/mm²
260 N/mm²
420 N/mm²
520 N/mm²
The plywood
Has good strength along the panel only
Can be spilt in the plane of the panel
Has greater impact resistance to blows than ordinary wood
Cannot be bent more easily than ordinary wood of same thickness
To give a brilliant finish, the type of varnish used, is
Water varnish
Spirit varnish
Turpentine varnish
Oil varnish
Initial setting time of cement for asbestos cement products should be not less than
30 minutes
50 minutes
75 minutes
90 minutes
Pick up the correct statement from the following:
The percentage of absorption for firebricks varies from 5 to 10
The percentage of silica in silica bricks is to the extent of about 95 to 97 percent
Roughly 1 to 2 percent of lime in silica bricks is added to act as binding material
All the above