81. The age of a tree can be known by examining_________________?
A. cambium layer
B. annular rings
C. medullary rays
D. heart wood
✅ The correct answer is option B.
Building Materials and Construction MCQs
82. Crushing strength of a good building stone should be more than____________?
A. 50 MPa
B. 100 MPa
C. 150 MPa
D. 200 MPa
✅ The correct answer is option B.
83. The type of pile which is driven at an inclination to resist inclined forces is known as______________?
A. friction pile
B. sheet pile
C. batter pile
D. anchor pile
✅ The correct answer is option C.
84. Quick lime is_______________?
A. calcium carbonate
B. calcium oxide
C. calcium hydroxide
D. none of the above
✅ The correct answer is option B.
85. 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%
✅ The correct answer is option B.
86. A first class brick when immersed in cold water for 24 hours should not absorb water more than______________?
A. 15%
B. 20%
C. 22%
D. 25%
✅ The correct answer is option B.
87. Sapwood consists of______________?
A. innermost annular rings around the pith
B. portion of timber between heartwood and cambium layer
C. thin layers below the bark
D. thin fibre which extends from the pith outwards and holds the annular rings together
✅ The correct answer is option B.
88. The practical limit of moisture content achieved in air drying of timber is________________?
A. 5%
B. 15%
C. 25%
D. 35%
✅ The correct answer is option B.
89. Spalling hammer is used for_____________?
A. driving wooden headed chisels
B. rough dressing of stones
C. carving of stones
D. breaking small projection of stones
✅ The correct answer is option B.
90. Which of the following represents a metamorphic rock? (1) slate (2) shale (3) quartzite . The correct answer is___________?
A. only (3)
B. both (1) and (3)
C. both (2) and (3)
D. all (1), (2) and (3)
✅ The correct answer is option B.