Quiz: CIVIL ENGINEERING

Exam: NPCIL-SCINTIFIC ASSISTANT(CIVIL)

Topic: MISCELLANEOUS

Each question carries 1 mark

Negative marking: No negative marking

Time: 10 Minutes

Q1. The error which occurs when image formed by objective is not in the same plane with cross-hairs of the telescope is

(a) Aberration

(b) Parallax

(c) Applanation

(d) Achromatism

Q2. The process of determining the locations of the instrument station by drawing resectors from the locations of the known stations is called

(a) radiation

(b) intersection

(c) resection

(d) traversing

Q3. The instrument which is used in plane tabling for obtaining horizontal and vertical distances directly without resorting to chaining, is known as

(a) Plane alidade

(b) telescopic alidade

(c) clinometer

(d) tacheometer

Q4. Orientation of plane table by solving two point problem is only adopted when

(a) saving of time is a main factor

(b) better accuracy is a main factor

(c) given points are inaccessible

(d) none of these

Q5. Three point problem can be solved by

(a) Tracing paper method

(b) Bessels method

(c) lehman’s method

(d) All of these

Q6. The type of spike used for fixing chairs of bull headed rails to wooden sleepers is

(a) dog spike

(b) rail screw

(c) elastic spike

(d) round spike

Q7. Steel has its yield strength of 400 N/mm² and modulus of elasticity of 2 × 105 MPa. Assuming the material to obey Hook’s law up to yielding, what is its proof resilience?

(a) 0.8 N/mm²

(b) 0.4 N/mm²

(c) 0.6 N/mm²

(d) 0.7 N/mm²

Q8. The natural void ratio of a sand is 0.6 and its density index is 0.6. if its void ratio in the loosest state is 0.9, then the void in the densest state will be

(a) 0.2

(b) 0.3

(c) 0.4

(d) 0.5

Q9. Which one of the following is the water content of the mixed soil made from 1 kg of soil (say A) with water content of 100% and 1 kg of soil (say B) with water content of 50% ?

(a) 66%

(b) 71%

(c) 75%

(d) 82%

Q10. The relationship between content (w%) and number of blows (N) in soils, as obtained from casagrande’s liquid limit device, is given by

w = 20 – log10 N

The liquid limit of soil is

(a) 15.6%

(b) 16.6%

(c) 17.6%

(d) 18.6%

Solutions

S1. Ans.(b)

Sol. When image formed by objective is not in the same plane with cross hair of the telescope is called parallax.

S2. Ans.(c)

Sol. The process of determining the location of the instrument station by drawing resectors from the location of the known station is called resection.

S3. Ans.(b)

Sol. Telescopic alidable is used in plane tabling for obtaining horizontal and vertical distances directly without resorting to chaining.

S4. Ans.(c)

Sol. When given points are inaccessible then orientation of plane table by solving two point problem is only adopted intersection is used.

S5. Ans.(d)

Sol. Three point problem solved by following

(i) Tracing paper method

(ii) Bessels method

(iii) Lehman’s method

S6. Ans.(d)

Sol. Round spikes : It is mainly used for fixing cast iron chair to wooden sleepers and also in switch fitting on wooden sleepers.

S7. Ans.(b)

Sol. Proof Resilience:

Umax = (σy^2)/2E = (400)^2/(2 × 2 × 10^5 ) = σ

= 0.4 N/mm^2

S8. Ans.(c)

Sol. Density index = (emax – e )/(emax – emin)

0.6 = (0.9 –0.6)/(0.9 –emin)

▭(emin=0.4)

S9. Ans.(b)

Sol.

W_mix/(1+w) = W_A/(1+w_1 ) + W_B/(1+w_2 )

2/(1 + w) = 1/(1 + 1 ) + 1/(1 + 0.5 )

▭(w=71%)

S10. Ans.(d)

Sol. N = 25

w_L = 20- log_1025

= 20 – 2 log_105

= 18.6%