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During leveling if back sight is more than fore sight, then Backward staff point is lower than forward staff point.

petty work has costing less than Rs 20,000.

3.4 m is the multistoried government buildings floor height.

When a chain is used at a temperature more than the temperature, it was calibrated the error in measured length will be cumulative.
These are also known as systematic errors.
Errors are proportanal to the length of line.

Any arbitrarily assumed level line from which vertical distances are measured is known as datum line.

Pitot tube is a device used in the flowing fluid for measuring velocity.
The pitot tube principle uses two pipes to convey fluid pressure to the sensing element in such a manner that the difference in pressure between the two is proportional to the flow velocity.
Pitot tubes are used in anemometers to calculate airspeed in wind tunnels and aircraft in flight.

no change in the level of pond water

The only type of sleeper to be provided over a rail bridge is concrete sleeper

Coning of wheels is provided to prevent lateral slip.
Inward provision of the slope of 1:20 on the wheels of the railway wagon to counteract the centrifugal force acting the on the train.
So, it enables the train wheels to cover different distances along the inner and outer curves simultaneously.

Rolling of rod should be From edge to centre with an overlap of minimum 30 cm

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