Bricks MCQ – Building Materials

31. What is the nominal size of standard brick?

1. 19 cm × 9 cm × 9 cm
2. 20 cm × 10 cm × 10 cm
3. 22 cm × 11.5 cm × 7.5 cm
4. 20 cm × 10 cm × 5 cm

32. Tolerance limits for dimensions of bricks in length, width and height, respectively, for a sample of 20 bricks taken together as per IS code are

1. 2000 mm, 90 mm, 90 mm
2. 80 mm, 40 mm, 40 mm
3. 100 mm, 95 mm, 95 mm
4. 50 mm, 20 mm, 20 mm

33. The ‘frog’ of the brick in a brick masonry is kept on

1. top face
2. bottom face
3. outer side of the wall
4. inner side of the wall

34. Which of the following steps in the manufacturing bricks is carried out in pug mill?

1. Cleaning
2. Digging
3. Tempering
4. Weathering

35. The most important purpose of frog in a brick is to

1. Reduce the weight of brick
2. Emboss manufacture’s name
3. Form key joint between brick and mortar
4. Improve insulation by providing ‘hollows’

36. A good brick earth can be rolled without breaking in small Thread of diameter

1. 6 mm
2. 1 mm
3. 10 mm
4. 3 mm

37. Which one of following is not mechanical property of bricks?

1. Fire resistance
2. Modulus of rupture
3. Texture
4. Tensile strength

38. The range of alumina present in good brick earth by weight is

1. 50 to 70%
2. 5 to 10%
3. 20 to 30%
4. 40 to 46%

39. A first class brick should not absorb water more than _______ of its own dry weight after 24 hours immersion in cold water

1. 10%
2. 15%
3. 20%
4. 25%

40. Excess of alumina in the clay

1. Makes the brick brittle and weak
2. Makes the brick crack and warp on drying
3. Changes colour of the brick from red to yellow
4. Improves impermeability and durability of the brick