SSC-JUNIOR ENGINEER (Civil & Structural) Online Exam 2020 (Exam held on 23/03/2021) (Part-IV)

GENERAL ENGINEERING CIVIL AND  STRUCTURAL

Total Questions: 50

1. No deduction is made in the quantity estimation for plastering work in cement mortar for openings having size up to:

Correct Answer: D. 0.5m²
Solution:Deductions related to plastering are as follows:

For small opening up to 0.5m² area, no deduction in plastering is made.

For the opening of size 0.5 m² to 3m² area, the deduction is made on one face of the wall.

For openings of size above 3 m², the deduction is made on both faces of the wall, but the area of the sill, jamb, and soffits of the opening is added.

2. A village has a population of 200 with an average rate of water demand as 100 litre per capita per day. A rapid sand filter having an average filtration rate of 100 litre/hour/m² is to be designed for water treatment. The area of rapid sand filter required is:

(Take the ratio of maximum demand to average demand as 1.5.)

Correct Answer: B. 12.5m²
Solution:

3. In an incompressible static fluid column, the rate of increase of pressure in the vertical direction is equal to weight density of fluid at that point. Which of the following is the law for this statement?

Correct Answer: A. Hydrostatic law
Solution:According to Hydrostatic Law, the rate of increase of pressure in a vertical direction is equal to the weight density of the fluid at that point when the fluid is stationary.

The pressure at any point in a fluid at rest is obtained by the Hydrostatic Law which states that the rate of increase of pressure in a vertically downward direction must be equal to the specific weight of the fluid at that point.

This is hydrostatic law.

4. In limit state design, the design bond stress for deformed bars (conforming to IS 1786) for M20 concrete mentioned in IS 456 : 2000 is (in N/mm² units):

Correct Answer: C. 1.92
Solution:

5. Which of the following can be considered as a taking off point in road planning in India?

Correct Answer: B. Nagpur plan
Solution:The first 20 year Road Development Plan is also popularly known as Nagpur Road Plan. For development and construction of roads, the government took a conference of chief engineers at Nagpur in 1943. The conference is popularly known as the Nagpur Road Plan.

Nagpur Road Plan is the first attempt for the road development programme.

The construction and the development of the roads were assigned to the central government of India.

The targeted road length in the Nagpur Road Plan is 16 km per 100 square km area of the country. The Nagpur Road Development Plan was planned for a time period of 1943-1963, but it was achieved two years before.

6. The determination of plasticity index and the percentage by weight of clay mineral finer than 2 µ present in the soil were done for two soil samples A and B. The ratio of plasticity index to the percentage of clay size particle for the samples A and B are given in the table.

 (Soil Sample)  (Ratio of plasticity index to percentage of clay size particle)
Sample ALess than 0.75
Sample BGreater than 1.25
The two soil samples A and B are classified as:
Correct Answer: B. Sample A : Inactive; Sample B: Active
Solution:No explanation given in the book

7. A horizontal pipeline AB of diameter conveys water, flowing from A to B. The U-tube manometer with mercury as manometric liquid can be used for the measurement of:

Correct Answer: C. difference in the pressure head between two points A and B
Solution:Figure shows an arrangement for measuring the difference in pressure between two points A and B using a U-tube differential manometer. Let the two points A and B are in two pipe-lines at different levels, with a level difference z. Assume that the two pipes carry different liquids having specific weight w₁ and w3 (specific gravity s₁ and s3) respectively. Taking C-C as the datum and equating the pressure head at the two sides, we get,

where w₂ is the specific weight of manometric liquid and h is its difference in level on both side

8. What will be the depth of penetration of the Plunger in Vicat Apparatus (IS:5513-1976) from the bottom of the Vicat Mould, when the cement paste is tested for standard consistency, according to IS:4031-1988?

Correct Answer: A. 5 to 7 mm
Solution:The standard consistency of a cement paste is defined as that consistency which will permit the vicat plunger to penetrate to a point 5 to 7 mm from the bottom of the vicat mould.

9. In earthquake resistant design, response reduction factor (R) for steel special moment resisting frame (SMF) design as per IS 800:2000 is:

Correct Answer: C. 5.0
Solution:

10. The following readings were obtained during differential levelling.

Reduced Level (RL) of point A is 240.000 m. The foresight and back sight between points. A and TPI is 1.420 m and 2.024 m. respectively. Foresight and back sight between points TPI and TP2 is 2.100 m and 1.986 m. respectively. The back sight from B is 1.722 m. These are marked on the given figure. What is the RL at turning point-2 (TP2)? All values are in metres.

Correct Answer: D. 240.490 m
Solution:Reduced level of point A = 240m
Foresight at point A = 2.024
Backsight at point A = 1.42
Foresight at point TPI = 1.986
Backsight at point TPI = 2.100
∴ Reduced level (RL) at a turning point-2 = 240 + 2.024 + 1.42 + 1.986 - 2.1 = 240.49m .