If + 0.8% grade meets - 0.7% grade and the rate of change of grade for 30 m distance is 0.05, the length of the vertical curve will be
If the chain line which runs along N-S direction is horizontal and the ground in E-W direction is sloping
1. it is possible to set offsets correctly on east side
2.it is possible to set offsets correctly on east side
3.it is not possible to set offsets correctly on west side
4.it is possible to set offsets correctly on both sides.
4. clothoid spiral.
A lens or combination of lenses in which the following defect is completely eliminated is called aplanatic
1.N 90° W
2. S 90° W
4. 90° W.
In a perfect prismatic compass
1.magnetic axis and geometric axis of the needle coincide
2.ends of the needle and pivot are in same vertical and horizontal planes
3.pivot is vertically over the centre of the graduated circle
4.all the above.
In a telescope the object glass of focal length 14 cm, is located at 20 cm from the diaphragm The focussing lens is midway between them when a staff 1650 m away is focussed The focal length of the focussing lens, is
2. 6.24 cm
Locating the position of a plane table station with reference to three known points, is known as
3. resection method
4.three point problem.
1.ridge down the hill
2.saddle down the hill
3.bottom to the ridge
4.bottom to the saddle.
Staff readings on pegs x and y from X station are 1.755 m and 2.850 m, and from station Y on staff head at Y and X are 0.655 m and 1.560 m. If reduced level of X is 105.5 m, the reduced level of Y is
The defect of a lens whereby rays of white light proceeding from a point get dispersed into their components and conveyed to various foci, forming a blurred and coloured image is known as
A level when set up 25 m from peg A and 50 m from peg B reads 2.847 on a staff held on A and 3.462 on a staff held on B, keeping bubble at its centre while reading. If the reduced levels of A and B are 283.665 m and 284.295 m respectively, the collimation error per 100 m is
1. 0.015 m
2. 0.030 m
For taking offsets with an optical square on the right hand side of the chain line, it is held
1.by right hand upside down
2. by left hand upright
3.by right hand upright
4. by left hand up side down.
If deflection angles are measured in a closed traverse, the difference between the sum of the right-hand and that of the left hand angles should be equal to
1.each of the whole circle reckoning has to be micros by 10°
2.in the quadrantal method, the correction is positive in the 1st and 3rd quadrants
3. in the quadrantal method, the corrections is negative in 2nd and 4th quadrants
4.all the above.
It is more difficult to obtain good results while measuringhorizontal distance by stepping
3.in low undulations
4.in plane areas.
1.away from the telescope pointing down hill
2.towards the telescope pointing up-hill
3.away from the telescope pointing up-hill
4.none of these.
1.with both handles in his left hand, the chain man throws out the chain with his right hand and the second chain man assists him to free it from knots
2.the follower of the chaining operation should be more experienced than the leader
3.at the end of the tenth chain length, the two chain men meet and the ten arrows are handed over to the leader
4.all the above.
1.while measuring a distance with a tape of length 100.005 m, the distance to be increasing by 0.005 m for each tape length
2.an increase in temperature causes a tape to increase in length and the measured distance is too large
3.the straight distance between end points of a suspended tape is reduced by an amount called the sag correction
4.a 100 m tape of cross section 10 mm x 0.25 mm stretches about 10 mm under 5 kg pull.
Planimeter is used for measuring
1.the diameter of the aperture
2.the pupil aperture of the eye
3.the diameter of the object glass
4.all the above.
1.a steep surface
2.a flat surface
3.an inclined plane surface
The additional lines which are measured to show the correctness of the chain surveying are called
3. tie lines
4. all of these.
1.back tangent and forward tangent
2.prolongation of back tangent and forward tangent
3.forward tangent and long chord
4.back tangent and long chord.
The back staff reading on a B.M. of R.L. 500.000 m is 2.685 m. If foresight reading on a point is 1.345 m, the reduced level of the point, is
The bearing of lines OA and OB are 16° 10' and 332° 18', the value of the included angle BOA is
1.30 (sec θ - 1) m
2.30 (sin θ - 1) m
3.30 (cos θ - 1) m
4.30 (tan θ - 1) m
1. clockwise from the forward station
2. anti-clockwise from the back station
3. anti-clockwise from the forward station
4.clockwise from the back station.
2.plane table surveying
The reduced level of a floor is 99.995 m, the staff reading on the floor is 1.505 m. If the inverted staff reading against the roof is 1.795 m, the floor level below the slab, is
1. 3.290 m
The staff reading at a distance of 80 m from a level with the bubble at its centre is 1.31 m. When the bubble is moved by 5 divisions out of the centre, the reading is 1.39 m. The angular value of the one division of the bubble, is
1.provided with stadia hairs in front of eye piece
2.not provided with stadia hairs at all
3.fitted with a glass wedge inside the telescope
4.fitted with a glass wedge in front of telescope.
To orient a plane table at a point with two inaccessible points, the method generally adopted, is
4.two point problem.
1.systematic angular errors
2.accidental linear errors
3.systematic linear errors
4. accidental angular errors.
While setting a plane table at a station it was found that the error in centering was 30 cm away from the ray of length 40 m drawn from the station. If the scale of the plan is 1 cm = 2 cm, the displacement of the end of the ray in plan from the true position will be
2. 0.15 cm
3. 02 cm
4. 0.1 cm