31. Which of the following has more fire resisting characteristics?
A. Marble
B. Limestone
C. Compact Sand Stone
D. Gravel
C. Compact Sand Stone
32. The rocks which are formed due to the cooling of magma at a considerable depth from the earth’s surface are called
A. Plutonic rocks
B. Hypabyssalrocks
C. Volcanic rocks
D. Igneous
A. Plutonic rocks
33. Plywood has the advantage of
A. Greater tensile strength in a longer direction
B. Greater tensile strength in a shorter direction
C. Same tensile strength in all directions
D. None of the
C. Same tensile strength in all directions
34. Due to an attack of dry rot, the timber
A. Cracks
B. Shrinks
C. Reduces to powder
D. None of these
C. Reduces to powder
35. Excess alumina in brick earth makes the brick
A. Impermeable
B. Brittle andweak
C. To losecohesion
D. To crack and warp on drying
D. To crack and warp on drying
36. Pick up the correct statement from the following
A. In stone arches, the stones are placed with their natural bed 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
the Above
37. 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 aluminoferrite
C. Tri-calcium aluminate
38. The inner part of a timber log surrounding the pitch, is called
A. Sapwood
B. Cambiumlayer
C. Heartwood
D. None to these
C. Heartwood
39. For testing the 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
(B) 1 :3
40. If the iron ore contains clay as an impurity, the flux added during calcination, is
A. Clay
B. Limestone
C. Argillaceous iron ore
D. All the above
B. Limestone
