Assertion A : Paints with white lead base are not recommended for painting of iron works. Reason R : Paints with white lead base do not check rusting of iron. 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
Correct Answer :
A. Both A and R is true and, R is the correct explanation of A
Related Questions
The pigment used in paints for corrosive resistance, is
White lead
Ferrous oxide
Zinc white
Red lead
Which of the following gradients exerts maximum influence on properties of steel?
Iron
Carbon
Manganese
Sulphur
A first class brick when immersed in cold water for 24 hours should not absorb water more than
15 %
20 %
22 %
25 %
Jhumb bricks are
Under burnt
Over burnt
Kutcha
None of these
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
Which of the following trees yields hard wood?
Deodar
Chir
Shishum
Pine
The operation of removal of impurities or clay adhering to iron ores, is known as
Dressing
Calcination
Roasting
Smelting
Refractory bricks resist
High temperature
Chemical action
Dampness
All the above
Slate is formed by metamorphic action on
Shale
Lime stone
Sand stone
Granite
The most important constituent of an oil paint, is
Thinner
Vehicle
Pigment
All the above
Steel contains carbon approximately
1.50% to 5.6%
0.05% to 1.75%
0.25 %
None to these
Pick up the correct statement from the following:
Quick lime is obtained by burning pure lime stone
Hydraulic lime is obtained by burning lime stone containing clay 5% to 30%
Poor lime is obtained by burning lime stone containing impurities more than 5%
All the above
Plywood is obtained by gluing wooden sheets at
100 to 150 N/cm2
100 to 130°C
Both (A) and (B)
Neither (A) nor (B)
The specific gravity of marble, is
2.50
2.60
2.66
2.72
Dorry's testing machine is used for
Crushing test of stone
Hardness test of stone
Impact test of stone
Water absorption test
For obtaining vinyl chloride acetate, the method used, is
Addition polymerization
Condensation polymerization
Co-polymerization
None of these
The portion of a brick cut to form angles other than right angles in plan, is known as
Queen closer
King closer
Closer
Squint brick
Pick up the volcanic rock from the following:
Granite
Dolerite
Basalt
All the above
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
With storage, strength of cement
Increases
Decreases
Remains the same
None to these
The standard size of masonry bricks, is
18 cm × 8 cm × 8 cm
19 cm × 9 cm × 9 cm
20 cm × 10 cm × 10 cm
21 cm × 11 cm × 11 cm
The preparation of surface of stone to obtain plain edges or to obtain stones of required size and shape is known as
Quarrying of stones
Blasting of stones
Seasoning of stones
Dressing of stones
Which of the following has more fire resisting characteristics?
Marble
Lime stone
Compact sand stone
Granite
The most commonly used synthetic abrasive is
Aluminium carbide
Boric acid
Silicon
All of these
Asbestos
Is an excellent insulator for heat and electricity
Is fire-proof and acid proof
Has sp. gravity equal to 3.10
All the above
The hardest rock is
Marble
Diamond
Talc
Quartz
Bitumen felt is used for
Water proofing
Damp proofing
Both (A) and (B)
Neither (A) nor (B)
The main ingredient of a good quality brick earth, is
Magnesia
Lime
Silica
Alumina
The commonly used colour pigment in paints, is
Ambers
Carbon black
Iron oxide
All the above
The tendency of a stone is, to split along:
Texture
Fracture
Cleavage
Structure