Building Materials Part-2

1.Which of the following has more fire resisting characteristics?

(A) Marble

(B) Lime stone

(C) Compact sand stone

(D) Granite

2.The rocks which are formed due to cooling of magma at a considerable depth from earth's surface are called

(A) Plutonic rocks

(B) Hypabyssal rocks

(C) Volcanic rocks

(D) Igneous rocks

3.Plywood has the advantage of

(A) Greater tensile strength in longer direction

(B) Greater tensile strength in shorter direction

(C) Same tensile strength in all directions

(D) None of the above

4.Due to attack of dry rot, the timber

(A) Cracks

(B) Shrinks

(C) Reduces to powder

(D) None of these

5.Excess of alumina in brick earth makes the brick

(A) Impermeable

(B) Brittle and weak

(C) To lose cohesion

(D) To crack and warp on drying

6.Pick up the correct statement from the following:

(A) In stone arches, the stones are placed with their natural beds radial

(B) In cornices, the stones are placed with their natural beds as vertical

(C) In stone walls, the stones are placed with their natural beds as horizontal

(D) All the above

7-The constituent of cement which is responsible for all the undesirable properties of cement is

(A) Di-calcium silicate

(B) Tri-calcium silicate

(C) Tri-calcium aluminate

(D) Tetra calcium alumino ferrite

8.Inner part of a timber log surrounding the pitch, is called

(A) Sapwood

(B) Cambium layer

(C) Heart wood

(D) None to these

9.For testing compressive and tensile strength of cement, the cement mortar is made by mixing cement and standard sand in the proportions of

(A) 1 : 2

(B) 1 : 3

(C) 1 : 4

(D) 1 : 6

10.If ‘P’ is the percentage of water required for normal consistency, water to be added for

determination of initial setting time, is

(A) 0.70 P

(B) 0.75 P

(C) 0.80 P

(D) 0.85 P

11.The basic purpose of a retarder in concrete is

(A) To increase the initial setting time of cement paste in concrete

 (B) To decrease the initial setting time of cement paste in concrete

(C) To render the concrete more water tight

(D) To improve the workability of concrete mix

12.Clay and silt content in a good brick earth must be at least

(A) 50 %

(B) 40 %

(C) 30 %

(D) 25 %

13.Which of the following is the purest form of iron?

(A) Cast iron

(B) Wrought iron

(C) Mild steel

(D) High carbon steel

14.If the iron ore contains clay as an impurity, the flux added during calcination, is

(A) Clay

(B) Lime stone

(C) Argillaceous iron ore

(D) All the above

15.The stretcher bond in brick masonry can be used only when the thickness of wall is

(A) 90 mm

(B) 180 mm

(C) 190 mm

(D) 280 mm

Answers

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