1. Size of hollow blocks of concrete is kept:
(A) None of these
(B) 39cm x 18cm x 10cm
(C) 39cm x 15cm x 20cm
(D) 39cm x 19cm x 30cm
2. Minimum strength of concrete blocks should be:
(A) 50kg/cm²
(B) 40kg/cm²
(C) 20kg/cm²
(D) 30kg/cm²
3. Hollow concrete block masonry is suitable due to:
(A) Heat proof
(B) All of these
(C) Light proof
(D) Sound proof
4. Masonry suitable for multistory building:
(A) Hollow blocks
(B) Solid concrete blocks
(C) Bricks
(D) Stone
5. Thickness of mortar for block masonry:
(A) 20-20mm
(B) 5-20mm
(C) 25-30mm
(D) 30-40mm
6. Solid layer is provided at this position of opening:
(A) Top
(B) Sides
(C) Bottom and sides
(D) Bottom
7. In concrete blocks masonry, sill at the opening is extended for the length of:
(A) 10cm
(B) 15cm
(C) 30cm
(D) 20cm
8. Size of aggregates in manufacturing of hollow concrete block should be:
(A) 5mm to 10mm
(B) 8mm to 14mm
(C) 6mm to 12mm
(D) 4mm to 8mm
9. ______ area of gross block section should be of concrete:
(A) 40%
(B) 60%
(C) 70%
(D) 80%