This set of Building Construction Multiple Choice Questions & Answers (MCQs) focuses on “Load Bearing Walls – Lateral Support”.
1. The load-bearing capacity of a wall is dependent on the _________ of the lateral supports.
Explanation: Load-bearing walls are subjected to various types of loads. A wall can be laterally supported at both horizontal and vertical intervals. The load-bearing capacity of a wall is dependent on the spacing of lateral supports. It also depends on its effectiveness.
2. A wall cannot be laterally supported at a horizontal level by __________
a) Cross wall
Explanation: Stresses are set up in walls by its own weight, by the weight of superimposed loads and by lateral pressure. A wall can be supported at the horizontal level by cross walls, piers or buttresses which transfer horizontal forces to the foundation.
3. Lateral support to a wall limits the slenderness and provides stability to the structure.
Explanation: Lateral support to a wall limits the slenderness and provides stability to the structure. A wall may require lateral support either at horizontal or vertical level.
4. A wall can be laterally supported at a vertical level by __________
a) Load bearing wall
Explanation: A wall can be supported at the vertical level by floor/roof which transfers horizontal forces to cross walls. These cross walls further transmit these forces to the foundation and provide stability to the structure.
5. ___________ masonry gives high basic compressive stress.
Explanation: The basic compressive stress is dependent on various factors like crushing strength of bricks, shape, and size of units, type of mortar used, etc. Ashlar masonry gives high values of basic compressive stress while coursed stone masonry gives low values.
6. Coursed stone masonry has __________ joints while ashlar masonry has _________ joints.
a) Thin, thin
b) Thick, thick
c) Thick, thin
d) Thin, thick
Explanation: Coursed stone masonry requires thick joints while ashlar masonry requires thin joints. This is because coursed stone masonry uses stones of irregular shapes and sizes whereas ashlar masonry uses finely dressed stones of proper shapes and sizes.
7. In the formula for calculating the total load supported by a lintel in which total load is given by the expression 0.44 L2 x t x W /100, W represents _________
a) Unit weight of masonry
b) Total weight of masonry
c) Unit weight of the load
d) Total weight of the load
Explanation: When the load is concentrated, it is supported by lintels. The total supported by a lintel is given by the expression 0.44 L2 x t x W /100 where L represents the span of the lintel, t represents the wall thickness and W represents the unit weight of masonry.
8. The anchors provided for timber floors and roofs should be at intervals of less than __________ meters in two-storeyed buildings.
Explanation: Timber floors and roofs should be anchored by metal anchors. National Building Code of India specifies that the anchors provided for timber floors and roofs should be at intervals of less than two meters in two-storeyed buildings.
9. The formula for calculating the total load supported by a lintel in which total load is given by the expression 0.44 L2 x t x W /100 is derived by assuming an angle of spread of __________
Explanation: The total supported by a lintel is given by the expression 0.44 L2 x t x W /100. This formula is derived assuming an angle of spread of 30° and that the lintel supports a load of the shape of an equilateral triangle having side equal to L meters.
Explanation: The given figure represents cross-walls providing lateral support to the wall. Therefore, A in the figure represents cross walls.
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