Gypsum consists of
H₂S and CO₂
CaSO4 and H₂O
Lime and H₂O
CO₂ and calcium
Correct Answer :
B. CaSO4 and H₂O
Related Questions
Sewer pipes are made of
Earthen ware
Stone ware
Refractory clay
All the above
Red short iron cracks when bent due to the presence of
Sulphur
Carbon
Phosphorus
Silicon
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
Lime stones are generally known as
Aqueous rocks
Sedimentary rocks
Stratified rocks
All the above
The presence of original rounded surface on the manufactured piece of timber, is called
Wane
Torn grain
Diagonal grain
Chipmark
If the furnace is provided with insufficient fuel at low temperatures, the type of pig iron produced, is called
Bessemer pig
Grey or foundry pig
White or forge pig
Mottled pig
Galvanising means covering iron with a thin coat of
Tin
Zinc
Glaze
Coal tar
Manganese steels
Are non-magnetic
Possess high electrical resistance
Possess low coefficient of expansion
All the above
With increase in moisture content, the bulking of sand
Increases
Decreases
First increases to a certain maximum value and then decreases
First decreases to a certain minimum value and then increases
The specific gravity of marble, is
2.50
2.60
2.66
2.72
Mastic asphalt is normally used for
Sound insulation
Water proofing
Fire proofing
None to these
Paints with white lead base are suitable for painting of
Wood work
Iron work
Both wood work and iron work
None of the above
The vehicle used in case of enamel paints is usually
Linseed oil
Water
Varnish
None of the above
A ferrous metal is
Cast iron
Wrought iron
Steel
All the above
Asphalt is obtained from
Petroleum distillation
Bitumen distillation
Plastic distillation
None of these
Ground glass
Is made by grinding its one side
Is made by melting powdered glass paints surface
Is used for getting light without transparency
All the above
In the method of condensation polymerization,
Low-molecular substances are removed from the high molecular substance
The reaction proceeds with an evolution of ammonia
The reaction proceeds with an evolution of hydrogen chloride
All of the above
According to IS 399-1963, the weight of the timber is specified at
8% moisture content
10% moisture content
12% moisture content
14% moisture content
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
Water paint is a
White wash
Colour wash
Whiting
All the above
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
For preparing porcelains, the clay should be
Sufficiently pure
Of high degree of tenacity
Of good plasticity
All the above
The frog of a brick is normally made on its
Top face
Bottom face
Longer face
Shorter side
The most durable varnish is
Water varnish
Spirit varnish
Turpentine varnish
Oil varnish
Based on flow quality, the sequence of pipes is
A.C. pipes, G.I. pipes, C.I. pipes, PVC pipes
C.I. pipes, G.I. pipes, A.C. pipes, PVC pipes
C.I. pipes, G.I. pipes, PVC pipes, A.C. pipes
None of these
The weight of 1 m3 of brick earth, is about
1200 kg
1500 kg
1800 kg
2000 kg
Pig iron made from haematite ores free from sulphur, phosphorus and copper, is known as
Bessemer pig
Grey or foundry pig
White or forge pig
Mottled pig
Invar contains
12% of nickel
24% of nickel
30% to nickel
36% of nickel
Good quality sand is never obtained from
River
Lake
Sea
Gravel powder
Basalt is
Sedimentary rock
Metamorphic rock
Extrusive igneous rock
Intrusive igneous rock