## Monday, May 16, 2011

### Civil Engineering Assertion and Reason type Objective Questions fully Solved

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Civil Engineering Assertion and Reason type Objective Questions fully Solved
Objective Solved Problems For UPSC IES Civil Engg
Civil Engineering exam Questions and Answers
IES question papers: Civil Engineering
Directions: Each of the following items consists of two statements, one labelled as the ‘Assertion A.’ and the other as ‘Reason (R) You are to examine these two statements carefully and select the answers to these items using the codes given below:
Codes:
A. Both A and R are individually true and R is the correct explanation of A.
B. Both A and R are individually true but R is not the correct .explanation of A
C. A is true but R is false ,
D. A is false but R is true
1. Assertion (A): Energy dissipation in a hydraulic jump is mainly caused by the large eddies in turbulence.
Reason (R) : Large eddies transport the fluid, over large distances, thus causing the mixing effect of turbulence.
Ans : C
2. Assertion (A): An economical channel section gives maximum discharge for a given cross-sectional area.
Reason (R) : An economical channel section has smooth surface for reduced friction
.
Ans : C
3. Assertion (A) : The possibility of piping failure in earth dams is more if black cotton soil is the foundation material.
Reason (R) : The highly expansive black cotton soils are the most common soils wherever Basalt rock is present.
Ans : B
4. Assertion (A) : The movement of two blocks of wood welted with hot glue requires greater, and greater effort as the glue is drying up.
Reason (R) : Viscosity of liquids varies inversely with temperature.
Ans : A
5. Assertion (A): In the border strip method of irrigation, the size of the strip depends on soil characteristics. slope of the land and discharge.
Reason (R) : Border strip method is a controlled type of subsurface irrigation method.
Ans : C
6. Assertion (A) : Reynolds number of a fluid flow is indicative of the relative dominance of the effects of momentum transfer between adjacent layers of the flow over the viscous stresses.
Reason (R) : For flow at high Reynolds numbers, the velocity profile is logarithmic
.
Ans : B
7. Assertion (A) : A seepage passing through the body of an earth dam affects the weight of dam.
Reason (R) : The specific weight of submerged soil is not dependent on the porosity of soil.
Ans : B
8. Assertion (A) : In a strainer type tube well, strainer pipes are surrounded by wire mesh. Reason (R) : This prevents the fine particles from entering the well pipe.
Ans : A
9. Assertion (A) : Break point chlorination ensures a residual of free available chlorine. Reason (R) : A super high chlorine dose inactivates the pathogens in a very short time.
Ans : B
10. Assertion (A) : Flow net is dependent on the permeability of soil through which flow is taking place.
Reason (R) : The flow net is useful in finding the discharge.
Ans : B
11. Assertion (A) : At the same voids ratio desiccated clay is stronger than saturated clay.
Reason (R) : Desiccation impacts (induces) pre-compressive forces in the soil structure.
Ans : A
12. Assertion (A) : Lining a canal is always beneficial and economical.
Reason (R) : The seepage losses are greatly reduced and extra water is available for irrigation.
Ans : D
13. Assertion (A) : Worn out (smooth) tyres offer higher friction factors on dry pavements than new tyres with treads well intact.
Reason (R) Reduced pneumatic pressure is held in tubes which carry smooth tyres over them.
Ans : A
14.Assertion (A) : In plane table photogrammetry, the areas to be mapped are taken from either end of a base line.
Reason (R) The position of the detail point with reference to the base line is obtained by intersection of rays drawn to it from each end of the base.
Ans : A
15. Assertion (A): Tie bars are used in cement concrete slabs across the longitudinal joints. Reason (R) : Tie bars are designed to act as load transfer devices.
Ans : C
16. Assertion (A) : Traffic Smog is likely to occur in regions where vehicle mileage is considerable and there is a low incidence of sunlight.
Reason (R) : Traffic Smog is caused by the reaction of oxides of nitrogen and some of the hydrocarbons in presence of bright sunlight.
Ans : C
17. Assertion (A) : In an intersection design, the relative speed is dependent on the absolute speed of intersecting vehicles and the angles between them.
Reason (R) : When the angle of merging is small, the relative speed will be high
.
Ans : B
18. Assertion (A) : The pandrol clip is a fit and forget type of fastening and is made from silicone manganese spring steel bar and heat treated.
Reason (R) : The pandrol clip has a point contact and causes indentation on the rail due to heavy toe load and small contact area.
Ans : B
19. Assertion (A) : In the overall design and layout of a harbour (or port), differentiation
is made between entrance’ and ‘channel’ depths.
Reason (R) : The ‘scend’ (or pitching) of a vessel may be larger at the entrance to the channel than within the channel.
Ans : A
20. Assertion (A) : The paved area adjacent to the terminal building and hangers used for loading and unloading, servicing and parking of aircraft is called as apron.
Reason (R) : The size of the apron depends on the size and number of gate positions and the way the gate positions are arranged.
Ans : B