Construction Materials MCQs - Stone Composite Masonry

1. In _________ the enclosed angle on the inside of the wall is between 90 degrees and 180 degrees.
a) Obtuse quoin
b) Acute squint
c) Acute quoin
d) Obtuse squint

Answer: d
Explanation: In Obtuse squint, angle usually varies from 105° to 135°, the more common being 120°. An obtuse quint may be in the form of English bond or in the double Flemish bond. The walls in both the cases are of one and half times of brick thickness

2. Which of the following is not a type of composite masonry?
a) Stone composite masonry
b) Brick composite masonry
c) Cement concrete masonry
d) Glass block masonry

Answer: b
Explanation: Composite masonry is the one that is constructed out of two or more than two types of building units or in which different types of building materials are used for construction. It is of the following types – stone composite masonry, brick stone composite masonry, cement concrete masonry, hollow clay tile masonry, reinforced brick masonry and glass block masonry.

3. Which form of brick stone composite masonry is commonly used at locations where rubble stone is available in huge amounts, but ashlar is not available?
a) Brick-backed ashlar masonry
b) Brick-backed stone slab facing
c) Rubble-backed brick masonry
d) Stone-backed masonry

Answer: c
Explanation: Bricks and stones can be simultaneously used in three forms of composite masonry – brick-backed ashlar masonry, brick-backed stone slab facing and rubble-backed brick masonry. In brick-backed ashlar masonry, alternate courses of ashlar are present. Brick-backed stone slab facing is composed of bricks which are laid in courses with proper bonds whereas rubble-backed brick masonry is usually used at locations where rubble stone is available in huge amounts, but ashlar is not available.

4.Composite stone masonry generally, consists of a combination of ______ and _____ masonry.
a) Stone and brick
b) Stone and ashlar
c) Ashlar and rubble
d) Brick and rubble

Answer: c
Explanation: Composite stone masonry generally, consists of a combination of ashlar masonry and rubble masonry. In rubble masonry, irregular shapes of stones are used whereas in ashlar masonry, regular shaped stones are used.

5. According to the recommendations laid by the Concrete Association of India, what should be the least strength of the blocks used in concrete masonry?
a) 3 N/mm2
b) 4 N/mm2
c) 2 N/mm2
d) 5 N/mm2

Answer: a
Explanation: Concrete Association of India recommends that the strength of the blocks used in concrete masonry should be at least 3 N/mm2 and the recommended size of common blocks used in cement concrete masonry are 39 cm x 19 cm x 30 cm; 39 cm x 19 cm x 20 cm and 39 cm x 19 cm x 10 cm.

6. In concrete masonry, a hollow concrete block has core-void area greater than __________ of the gross area.
a) 20%
b) 15%
c) 30%
d) 25%

Answer: d
Explanation: Concrete masonry uses two types of cement concrete blocks for the construction of walls – hollow concrete block and solid concrete block. A hollow concrete block has core-void area greater than 25% of the gross area.

7.In which of the following surface finishes, finishing material such as marble is used on the facing side of the block?
a) Common finished surface
b) Glazed finish
c) Specially faced finish
d) Coloured finish

Answer: c
Explanation: Common finished surface is obtained by mixing appropriate aggregates. Glazed finish is used to give a shiny appearance. Coloured finish is obtained by adding various colored pigments to the concrete mix to impart different colors whereas in specially faced finish, finishing material such as marble, is used on the facing side of the block.

8. While manufacturing the concrete masonry bricks, the cement aggregate ratio should not be thinner than __________
a) 1:6
b) 1:3
c) 3:4
d) 1:4

Answer: a
Explanation: While manufacturing the concrete masonry bricks, the cement aggregate ratio should not be thinner than 1:6. The aggregate should have a mixture with the proportion of fine aggregate being 60% and coarse aggregate being 40%.

9. Which of the following surface finishes is used for decorative works?
a) Slumped finish
b) Coloured finish
c) Specially faced finish
d) Glazed finish

Answer: d
Explanation: Glazed finish is used to give a very pleasing and shiny appearance to the surfaces. Hence, this type of surface finish is widely used for decorative works.

10. In hollow clay blocks masonry, the load bearing main walls should be constructed in __________ (cement, lime, sand) mix.
a) 1:2:6
b) 1:1:6
c) 1:2:9
d) 1:1:9

Answer: b
Explanation: In hollow clay blocks masonry, the load bearing main walls should be constructed in 1:1:6 (cement, lime, sand), while non-load bearing main walls should be constructed in 1:2:9 mix.