WorksheetsBMC_Unit-1
Total questions: 20
Worksheet time: 10mins
Name
Class
Date
1.
A stone having a toughness index greater than 19 is classified as
a)
Not tough
b)
Moderately tough
c)
Tough
d)
Highly tough
2.
Which quarrying method gives maximum accuracy and minimum wastage?
a)
Blasting
b)
Wedging
c)
Channeling
d)
Wire sawing
3.
The most suitable property required for stones used as road metal is
a)
Porosity
b)
Toughness
c)
Fire resistance
d)
Appearance
4.
Stones having distinct bedding planes belong to
a)
Igneous rocks
b)
Unstratified rocks
c)
Stratified rocks
d)
Metamorphic rocks
5.
Limestone is classified as
a)
Siliceous stone
b)
Argillaceous stone
c)
Calcareous stone
d)
Metamorphic stone
6.
Maximum permissible water absorption for good building stone is
a)
0.01
b)
0.008
c)
0.006
d)
0.003
7.
Dressing of stones is mainly done to
a)
Increase crushing strength
b)
Improve appearance and bonding
c)
Reduce weight
d)
Increase hardness
8.
The tool used for intermediate finishing of stones is
a)
Pointed chisel
b)
Flat chisel
c)
Claw chisel
d)
Hammer
9.
Plasticity of brick earth is mainly due to
a)
Silica
b)
Alumina
c)
Lime
d)
Iron oxide
10.
Excess alumina in brick earth leads to
a)
Brittle bricks
b)
Dark colour
c)
Cracking and warping
d)
Powdering
11.
Which constituent of brick earth acts as a flux?
a)
Alumina
b)
Silica
c)
Lime
d)
Iron oxide
12.
Bricks are generally burnt at a temperature of
a)
500–700°C
b)
700–900°C
c)
900–1200°C
d)
1200–1500°C
13.
Sudden cooling of bricks after burning causes
a)
Efflorescence
b)
Powdering
c)
Thermal cracks
d)
Shrinkage
14.
Standard size of brick as per IS practice is
a)
230 × 110 × 75 mm
b)
190 × 90 × 90 mm
c)
200 × 100 × 100 mm
d)
180 × 80 × 80 mm
15.
Maximum water absorption allowed for first-class bricks is
a)
0.1
b)
0.15
c)
0.2
d)
0.25
16.
Fly ash shows pozzolanic behaviour because it reacts with
a)
Cement
b)
Gypsum
c)
Lime and water
d)
Silica gel
17.
Major advantage of using fly ash in concrete is
a)
Early strength
b)
Increased permeability
c)
Reduced heat of hydration
d)
Faster setting
18.
Fly ash bricks gain strength mainly by
a)
Burning
b)
Compaction only
c)
Chemical reaction during curing
d)
Air drying
19.
Which constituent in ceramics acts as a flux?
a)
Clay
b)
Quartz
c)
Feldspar
d)
Alumina
20.
The major disadvantage of ceramic materials is
a)
Low compressive strength
b)
High thermal conductivity
c)
Brittleness
d)
Low fire resistance
100 %
