Building Materials Part-1

1 Slate is formed by metamorphic action on
a) shale b) lime stone c) sand stone d) granite

2 Sandstone is a
i) sedimentary rock
ii) aqueous rock
iii) siliceous rock
The correct answer is
a) only (i) b) both (i) and (ii)
c) both (i) and (iii) d) all (i), (ii) and (iii)

3 A good building stone should not absorb water more than
a) 5 % b) 10 % c) 15 % d) 20 %

4 Crushing strength of a good building stone should be more than
a) 50 MPa b) 100 MPa c) 150 MPa d) 200 MPa

5 Specific gravity for most of the building stones lies between
a) 1.5 to 2.0 b) 2.0 to 2.5 c) 2.5 to 3.0 d) 3.0 to 3.5

6 The age of a tree can be known by examining
a) cambium layer b) annular rings
c) medullary rays d) heart wood

7 Sand stone is
a) volcanic rock b) igneous rock
c) metamorphic rock d) sedimentary rock

8 Common sand is a variety of
a) caicite b) quartz c) felspar d) chlorite

9 Plywood is made by bonding together thin layers of wood in such a way that
the angle between grains of any layer to grains of adjacent layers is
a) 0° b) 30° c) 45° d) 90°

10 The practical limit of moisture content achieved in air drying of timber is
a) 5 % b) 15 % c) 25 % d) 35 %

11 Crushing strength of a first class brick should not be less than
a) 3.5 N/mm2 b) 7.0 N/mm2 c) 10.5 N/mm2 d) 14.0 N/mm2

12 The percentage of alumina in a good brick earth lies between
a) 5 to 10 % b) 20 to 30 % c) 50 to 60 % d) 70 to 80 %

13 The nominal size of the modular brick is
a) 190 mm x 90 mm x 80 mm b) 190 mm x 190 mm x 90 mm
c) 200 mm x 100 mm x 100 mm d) 200 mm x 200 mm x 100 mm

14 Study the following statements.
i) Hydraulic lime is suitable for white washing,
ii) Fat lime is suitable for whitewashing,
iii) Hydraulic lime is suitable for making mortar,
iv) Fat lime is suitable for making mortar.
The correct answer is
a) (i) and (iv) b) (ii) and (iii) c) (i) and (ii) d) (iii) and (iv)

15 Le Chatelier's device is used for determining the
a) setting time of cement b) soundness of cement
c) tensile strength of cement d) compressive strength of cement


ANSWERS
1-a 2-d 3-a 4-b 5-c 6-b 7-d 8-b 9-d 10-b 11-c 12-b 13-c 14-b 15-b