SSC-Junior Engineer (Civil & Structural) Online Exam 2018 (Part-III)

Total Questions: 40

1. The calcined product in cement production is known as:

Correct Answer: B. clinker
Solution:Cement is a manufactured product made by blending different raw materials and firing them at a high temperature in order to achieve precise chemical proportions of lime, silica, alumina and iron in the finished product, known as cement clinker. Cement is therefore essentially a mixture of calcium silicates and smaller amounts of calcium aluminates that react with water and cause the cement to set.

2. __________ soil cannot achieve the plastic state of consistency.

Correct Answer: D. Coarse grained
Solution:Plasticity index indicates the degree of plasticity of a soil. Greater the plasticity index, greater the plasticity of the soil. Clay soils possessing high values of liquid limit and plasticity index are referred to as highly plastic or fat clays and those with low values described as lean clays.

Coarse grained soils cannot achieve the plastic state of consistency and their liquid limit and plastic limit may be said to coincide; that is, Iₚ = 0.

When the liquid limit or the plastic limit cannot be determined, the plasticity index is reported as NP (non-plastic). When the plastic limit is equal to or greater than the liquid limit, Iₚ is reported as zero.

3. For a 30 degree cranked or bend up bar, the inclined length of the crank is equal to:

Correct Answer: D. 2d
Solution:

4. Gunter's chain is ________ m long.

Correct Answer: D. 20.12
Solution:Gunter's chain is a distance measuring device used for surveying. Gunter developed an actual measuring chain of 100 links. These, the chain and the link, became statutory measures in England and subsequently the British Empire.

The 66-foot (20.1 m) chain is divided into 100 links, usually marked off into groups of 10 by brass rings or tags which simplify intermediate measurement. Each link is thus 7.92 inches long. A quarter chain, or 25 links, measures 16 1/2 feet and thus measures a rod (or pole). Ten chains measure a furlong and 80 chains measure a statute mile.

5. The minimum edge distance and end distance from the centre of any hole to the nearest edge of plate for sheared or hand flame cut edge is:

Correct Answer: D. 1.7 times the whole diameter
Solution:Edge and End Distances

Edge distance: Distance at right angles to the direction of stress from the centre of a hole to the adjacent edge.

End distance: Distance in the direction of stress from the centre of a hole to the end of the element.

The minimum edge and end distances from the centre of any hole to the nearest edge of a plate shall not be less than 1.7 times the hole diameter in case of sheared or hand-flame cut edges; and 1.5 times the hole diameter in case of rolled, machine-flame cut, sawn and planed edges.

6. Common glass is also known as:

Correct Answer: C. bottle glass
Solution:Common glass is also known as bottle glass is prepared from cheap raw materials like sodium silicate, iron silicate and calcium silicate. Bottle glass is available in different colours like green, brown and yellow. They have moderate resistance to chemicals. Bottle glass allows less light to enter and thus prevents fading or degradation of products stored in it.

Common glass is mainly used to manufacture household bottles, medicine bottles, glassware used for drinking, packaging of drugs, etc.

7. Temporary spurs are also called:

Correct Answer: D. bunds
Solution:A diversion headwork serves to divert the required supply into the canal from the river. A diversion headwork serves the following purposes:

1. It raises the water level in the river so that the commanded area can be increased.
2. It regulates the intake of water into the canal.
3. It controls the silt entry into the canal.
4. It reduces fluctuations in the level of supply in the river.
5. It stores water for tiding over small periods of short supplies.

A diversion headwork can further be sub-divided into two principal classes:

1. Temporary spurs or bunds.
2. Permanent weirs and barrages.

Temporary spurs or bunds are those which are temporary and are constructed every year after the floods. However, for important works, weirs or barrages are constructed since they are of permanent nature if designed properly.

8. Shear stress is ________ stress.

Correct Answer: A. tangential
Solution:Shear stress is defined as a force per unit area, acting parallel to an infinitesimal surface element.
  • Shear stress is primarily caused by friction between fluid particles, due to fluid viscosity.
  • Fluids at rest cannot resist a shear stress; in other words, when a shear stress is applied to a fluid at rest, the fluid will not remain at rest, but will move because of the shear stress.
  • For a good illustration of this, consider the comparison of a fluid and a solid under application of a shear stress: A fluid can easily be distinguished from a solid by application of a shear stress, since, by definition, a fluid at rest cannot resist a shear stress.

9. The designed bond stress of M20 grade concrete is:

Correct Answer: A. 1.2 N/mm² 2

10. The Unified Soil Classification System was originally developed by ________.

Correct Answer: B. Casagrande
Solution:A soil classification system is meant essentially to provide a language of communication between engineers. It may, thus, be considered a system of 'labelling', soils, which would convey the same meaning universally.

The Unified Soil Classification System (USCS), originally developed by Casagrande (1948), was intended for use in airfield construction during World War II. Later, in 1952, it was slightly modified to make it applicable to foundations, dams and other constructions. According to the USCS, the coarse-grained soils are classified on the basis of their grain-size distribution and the fine-grained soils (whose behaviour is controlled by plasticity) on the basis of their plasticity characteristics.