Surveying (Part-2) (General Engineering) (SSC JE)

Total Questions: 50

1. Which one of the following gives the correct distance between the lighthouse and a ship, when the lighthouse whose height is 100m is visible just above the horizon from the ship? [BPSC AE (GEN. ENGG.) 16.09.2018 ]

Correct Answer: (c) 38.54 km
Solution:

2. To find the RL of a roof slab of a building, staff readings were taken from a particular setup of the levelling instrument. The readings were 1.050 m with staff on the benchmark and 2.300 m with staff below the roof slab and held inverted. Taking the RL of the BM as 135.150m, the RL of the roof slab will be [BPSC AE (GEN. ENGG.) 16.09.2018 ]

Correct Answer: (d) 138.500
Solution:

Given,
RL of bench mark = 135.150 m
Staff reading on BM = 1.050 m
Inverted staff reading = 2.300 m
RL of roof slab = ?
Solving
RL of roof slab = RL of BM + Staff reading with staff on BM + inverted staff reading
RL of roof slab = 135.150 + 1.050 + 2.300
RL of roof slab = 138.500 m

3. For the scale of plotting 1 in 400, the permissible error in centring of plane table is about [BPSC AE (GEN. ENGG.) 16.09.2018 ]

Correct Answer: (c) 0.1 m
Solution:

4. Ceylon Ghat Tracer is used to measure [BPSC AE (GEN. ENGG.) 16.09.2018 ]

Correct Answer: (a) slope
Solution:

Ceylon Ghat Tracer
• It is a simple instrument used for measuring the "slope and setting grades".
• In preliminary surveys in the hilly areas the instrument is commonly used.

5. Modern levels are generally fitted with a telescope which is : [BPSC AE (GEN. ENGG.)-1995 ]

Correct Answer: (a) internal focusing
Solution:

In modern instruments, the graduations on the level tube are omitted, the dumpy level consists of a telescope fixed on a vertical spindle, the telescope of the dumpy level is generally of the internal focussing type.

6. What is the use of open cross staff in chain surveying? [NHPC JE (EE) 05.04.2022 (Shift-II) ]

Correct Answer: (c) To set out offset lines at right angles to a chain line
Solution:

Cross-staff–The simplest instrument used for setting out right angles is a cross staff it consists of either a frame or box with two pairs of vertical slits and is mounted on a pole shod for fixing in the ground.

The common forms of cross staff are–
(a) Open cross staff
(b) French cross staff
(c) Adjustable crosses staff
Open cross staff–It is provided with two pairs of vertical slits giving two lines of sight at right angles to each other.

7. Which of the following instruments is NOT used in chain surveying ? [NHPC JE (Civil) 04.04.2022 (Shift-II) ]

Correct Answer: (a) Trough compass
Solution:

Instruments used in chain surveying–
There are various types of instruments used in chain surveying for measuring linear measurement on the ground.
The instruments used in chaining in surveying are as follows:–
1. Chain, 2. Tapes, 3. Arrows, 4. Ranging rods, 5. Peg, 6. Offset rods, 7. Plumb bob, 8. Plaster's laths, and whites, 9. Clinometer.

8. A per IS 1492, which of the following is NOT the standard length of a metric surveying chain? [NHPC JE (ME) 06.04.2022 (Shift-I)]

Correct Answer: (b) 50 m
Solution:

As per IS 1492, the standard length of a metric surveying chain are–

9. In chain survey, building is an example for: [NHPC JE (EE) 05.04.2022 (Shift-I) ]

Correct Answer: (a) obstacle to both chaining and ranging
Solution:

Obstacle to both chaining and ranging– A building is the typical example of this type of obstacle the problem lies in prolonging the line beyond the obstacle and determining the distance across it.

10. ______ is the study of the structure, evolution and dynamics of the Earth and its natural mineral and energy resources. [IREL Diploma Trainee-11.09.2022 ]

Correct Answer: (a) Geology
Solution:

Geology–The study of the structure, evolution and dynamics of the earth and its natural mineral and energy resources.

Paleontology–The study of fossils of pre-historic species, plants etc.

Anthropology–The study of origin and development of human societies and their cultures.

Geography–The science which deals with the description, distribution and interaction of the diverse physical and biological features of earth's surface.