Pick up the incorrect statement from the following:
Plastics are chemical resistant
Plastics are durable
Plastics are ductile
Plastics are excellent electric insulators
Correct Answer :
C. Plastics are ductile
Related Questions
Pick up the correct statement from the following:
In basic Bessemer process, the steel heats the converter
In open-hearth process, the furnace heats the steel
In Siemens process, the impurities of pig iron are oxidised by the oxygen of the ore
All the above
The main constituent which imparts hydraulicity to hydraulic lime is
Calcium oxide
Silica
Clay
Water
The melting point of silica is:
1570°C
1630°C
1730°C
1850°C
Which of the following bricks are used for lining of furnaces?
Over-burnt bricks
Under-burnt bricks
Refractory bricks
First class bricks
For the manufacture of Portland cement, the proportions of raw materials used, are
Lime 63% ; silica 22% ; other ingredients 15%
Lime 22% ; silica 63% ; other ingredients 15%
Silica 40% ; lime 40% ; other ingredients 20%
Silica 70% ; lime 20% ; other ingredients 10%
Slacking of lime is affected by
Keeping it exposed to air
Immersing the lime in water
Crushing the lime lumps
None of these
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
Pick up the correct statement from the following:
Adding 5% to 6% of moisture content by weight, increases the volume of dry sand from 18% to 38%
The bulking of fine sand is more than that of coarse sand
If the percentage content of moisture exceeds 10%, increase in bulk of sand starts increasing
All the above
The thermosetting plastic
Becomes rigid when moulded at suitable pressure and temperature
At 127°C to 177°C permanently set and further application of heat does not soften it
Chars at 343°C
All the above
Pick up the hypabyssal rock from the following:
Granite
Dolerite
Basalt
All the above
The frog of the brick in a brick masonry is generally kept on
Bottom face
Top face
Shorter side
Longer side
Asbestos cement
Is brittle
Warps due to changes in humidity
Strength is lowered when saturated by water
All of the above
Which of the following is a rock?
Quartz
Mica
Gypsum
None of the above
Pick up the correct statement from the following:
Acid test is done to find out the weathering quality of stones
Attrition test is done to find out the rate of wear of stones which are used in road construction
Crushing test is done to find out the compressive strength of the stone
All the above
A piece of timber whose thickness and width are respectively 5 cm and 10 cm is called
Slate
Plank
Board
Strip
Calcination of iron ores is done
To remove moisture
To remove carbonic acid
By roasting in heaps
All the above
Pick up the most favourable condition for the rapid growth of fungus for dry rot from the following:
Absence of sun light
Dampness
Presence of sap
All the above
Wrought iron is used for
Structural works in beams
Small sized water pipes
Columns and struts
None to these
Which of the following ingredients of the brick earth enables the brick to retain its shape?
Alumina
Silica
Iron
Magnesia
The percentage of alumina and silica in good fire clay vary respectively is
25, 75
30, 70
35, 65
All of these
German silver is an alloy of
Zinc, lead and nickel
Silver, gold and lead
Copper, nickel and zinc
Copper, brass and zinc
The age of a tree can be known by examining
Cambium layer
Annular rings
Medullary rays
Heart wood
For construction of structures under water, the type of lime used, is
Hydraulic lime
Fat lime
Quick lime
Pure lime
Wrought iron contains carbon about
1.5% to 5.5%
0.5% to 1.75%
0.1% to 0.25%
None to these
The frog of a brick is normally made on its
Top face
Bottom face
Longer face
Shorter side
Pick up the incorrect statement from the following:
Plastics are chemical resistant
Plastics are durable
Plastics are ductile
Plastics are excellent electric insulators
Slump test for concrete is carried out, to determine
Strength
Durability
Workability
Water content
The most important constituent of varnish, is
Drier
Solvent
Resin
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
Pick up the correct statement from the following:
The average crushing strength of hand moulded bricks is 6000 t/m2
The average tensile strength of hand moulded brick is 200 t/m2
The average shearing strength of hand moulded brick is 600 t/m2
All the above