RT f2w
- If L is the length and B the width of the brick and t the thickness of mortar, the relation
between these is
(a) L = 2B (b) L = B + t
(c) L = B + 2 t (d) L = 2B + t - The weight of a standard brick should be
(a) 1000 g (b) 1500 g
(c) 2500 g (d) 3000 g - Frog is provided in
(i) 9 cm high bricks only
(ii) 4 cm high bricks only
(iii) extruded bricks only
Of the above
(a) only (i) is correct (b) only (ii) is correct
(c) (i) and (iii) are correct (d) (i), (ii) and (iii) are correct - The most important purpose of frog in a brick is to
(a) emboss manufacturer's name
(b) reduce the weight of brick
(c) form keyed joint between brick and mortar
(d) improve insulation by providing 'hollows' - Consider the following statements :
(1) About 25% of alumina in brick earth imparts the plasticity necessary for moulding
bricks into required shape
(2) Iron pyrite present in brick earth preserves the form of the bricks at high temperatures.
(3) Presence of weeds in brick earth makes the bricks unsound.
Which of these statements are correct?
(a) 1 and 2 (b) 1 and 3
(c) 2 and 3 (d) 1, 2 and 3 - Water absorption for Ist class bricks should not be more than
(a) 12% (b) 15%
(c) 20% (d) 25% - For hidden masonry works the bricks used should be
(a) Ist Class (b) IInd Class
(c) IIIrd Class (d) for any of the above - For centring of R.C.C. structures the bricks used should be
(a) Ist Class (b) IInd Class
(c) IIIrd Class (d) IVth Class - Match List-I (Constituents of bricks) with List-II (Corresponding influence) and select the
correct answer using the codes given below the lists :
List-I List-II
(Constituents of bricks) (Corresponding influence)
A. Alumina 1. Colour of brick
B. Silica 2. Plasticity recovery for
moulding