31. Which of the following sedimentary rocks changes into quartzite by metamorphic action ?
A. sand stone
B. lime stone
C. shale
D. gypsum
✅ The correct answer is option A.
Building Materials and Construction MCQs
32. Assertion A : Pure lime takes a long time to develop adequate strength. Reason R : Pure lime has slow hardening characteristics. Select your answer according to the coding system given below ?
A. Both A and R are true and R is correct explanation of A
B. Both A and R are true and R is not a correct explanation of A
C. A is true but R is false
D. A is false but R is true
✅ The correct answer is option A.
33. The ratio of the thickness of web to that of flange of steel rolled structural beams and channels is______________?
A. less than 1
B. equal to 1
C. greater than 1
D. less than 1 in beams but greater than 1 in channels
✅ The correct answer is option A.
34. Minimum width of landing should be_______________?
A. equal to width of stairs
B. half the width of stairs
C. twice the width of stairs
D. one fourth the width of stairs
✅ The correct answer is option A.
35. The frog of the brick in a brick masonry is generally kept on______________?
A. bottom face
B. top face
C. shorter side
D. longer side
✅ The correct answer is option B.
36. The process of mixing clay, water and other ingredients to make brick is known as______________?
A. kneading
B. moulding
C. pugging
D. drying
✅ The correct answer is option A.
37. The type of joint commonly used at the junction of a principal rafter and tie beam in timber trussess is__________________?
A. mortise and tennon joint
B. oblique mortise and tennon joint
C. butt joint
D. mitred joint
✅ The correct answer is option B.
38. The most commonly used retarder in cement is_________________?
A. gypsum
B. calcium chloride
C. calcium carbonate
D. none of the above
✅ The correct answer is option A.
39. Which of the following stresses is used for identifying the quality of structural steel ?
A. ultimate stress
B. yield stress
C. proof stress
D. none of the above
✅ The correct answer is option B.
40. Assertion A : Paints with white lead base are not recommended for painting of iron works. Reason R : Paints with white lead base do not check rusting of iron. Select your answer according to the coding system given below ?
A. Both A and R are true and, R is the correct explanation of A
B. Both A and R are true but R is not the correct explanation of A
C. A is true but R is false
D. A is false but R is true
✅ The correct answer is option A.