Minimum required water cement ratio for a workable concrete, is
0.30
0.40
0.50
0.60
Correct Answer :
B. 0.40
Related Questions
Dry rot
Cracks the timber
Reduces the strength of timber
Reduces the timber to powder
Spoils the appearance of timber
The percentage of alumina and silica in good fire clay vary respectively is
25, 75
30, 70
35, 65
All of these
Asbestos cement
Is brittle
Warps due to changes in humidity
Strength is lowered when saturated by water
All of the above
The weight of a good quality brick when immersed in water for a period of 16 hours should not exceed the weight of dry brick
20 %
15 %
10 %
None of these
Assertion A : Normally turpentine oil is recommended as thinner for indoor painting. Reason R : Turpentine oil is costlier than other thinners. Select your answer according to the coding system given below:
Both A and R is true and R is the correct explanation of A
Both A and R is true but R is not the correct explanation of A
A is true but R is false
A is false but R is true
A 1st class brick immersed in water for 24 hours, should not absorb water (by weight) more than
10 %
15 %
20 %
25 %
Specific gravity for most of the building stones lies between
1.5 to 2.0
2.0 to 2.5
2.5 to 3.0
3.0 to 3.5
If P is the percentage of water required for normal consistency, water to be added for determination of initial setting time, is
0.70 P
0.75 P
0.80 P
0.85 P
Sandstone is a (i) Sedimentary rock (ii) Aqueous rock (iii) Siliceous rock The correct answer is
Only (i)
Both (i) and (ii)
Both (i) and (iii)
All (i), (ii) and (iii)
Based on the following rocks and minerals, select the correct statement, quartz, shale, basalt, granite, marble, gypsum, mica
Basalt and marble are the only metamorphic rocks
There is no sedimentary rock
Granite is the only igneous rock
Quartz and mica are minerals
Quick lime
Generates heat when added to water
Reacts with carbon dioxide
May be used for white-washing
All the above
Spirit varnish generally consists of
Oil, wax and resin
Alcohol, wax and turpentine
Pigment and synthetic resin
Spirit and shellac
Laterite is a/an
Volcanic rock
Argillaceous rock
Calcareous rock
Siliceous rock
The cast iron when heated to red heat with powdered red haematite in an oven for increasing its toughness, is converted to
Grey cast iron
White cast iron
Mottled cast iron
Toughed cast iron
Pick up the correct statement from the following:
The phenol is carbolic acid
The phenol is either extracted from coal-tar or prepared from benzene
Phenol reacts with formaldehyde, to form phenol formaldehyde resin
All the above
Percentage of silica in a good brick earth lies between
5 to 10 %
20 to 30 %
50 to 60 %
70 to 80 %
Percentage of carbon content in mild steel is
Less than 0.25
Between 0.25 and 0.7
Between 0.7 and 1.5
Greater than 1.5
Le-Chatelier's device is used for determining the
Setting time of cement
Soundness of cement
Tensile strength of cement
Compressive strength of cement
PVC stands for
Plastic very compact
Polythene vinyl chloride
Polythene vinyl carbon
Polythene vanadium carbide
The colour of statuary marble used for sculptor's work, is
Red
Blue
White
Green
The cracks caused by shrinkage of the exterior surface of the wood exposed to atmosphere, are called:
Radial shakes
Heart shakes
Wind cracks
Twisted fibres
The commonly used base for iron and steel work, is
Red lead
Zinc white
White lead
Titanium white
Quartzite, a metamorphic stone is
Hard
Brittle
Crystalline
All the above
The normal consistency of ordinary Portland cement is about
10 %
20 %
30 %
40 %
Pick up the correct statement from the following:
Catalysts are added to assist and accelerate the hardening of resin
The fillers are inert materials and they impart strength and hardness
Fibrous fillers increase thermal resistance
All the above
Pick up the non-inflammable plastic from the following:
Cellulose acetate plastics
Polyvinyl chloride plastics
Phenol formaldehyde plastic
Urea formaldehyde plastic
Priming consists of
One part of white lead, 8 parts of chalk and four parts of twice boiled linseed oil
8 parts of white lead, one part of chalk and four parts of twice boiled linseed oil
One part of white lead, 8 parts of chalk and one part of linseed oil
None to these
Basalt is
Sedimentary rock
Metamorphic rock
Extrusive igneous rock
Intrusive igneous rock
Acrylic sheets
Possess 10 to 17 times greater breakage resistance than that of glass of equivalent thickness
Are generally unaffected by most household detergents
Possess the light transmission rate of 93%
All the above
Depending on the chemical composition and mechanical properties, iron may be classified as
Cast iron
Wrought iron
Steel
All the above