The first reading, from a level station is:

• For sight

• Back sight

• Intermediate sight

• Any sight

The least count of a levelling staff is

• 0.05 m

• 0.50 m

• 0.005 m

• 0.002 m

The imaginary line passing through the intersection of cross hairs and optical centre of the objective is known as

• Line of sight

• Line of collimation

• Axis of telescope

• None of the above

A relatively fixed point of known elevation above datum, is called

• Datum point

• Bench mark

• Reduced level

• Reference point

The method of surveying used for determining the relative heights of points on the surface of the earth is called

• Levelling

• Simple levelling

• Longitudinal levelling

• Differential levelling

A staff reading taken on a point whose elevation is to be determined as on a change point is called

• Back sight reading

• Intermediate reading

• Invert reading

• Fore sight reading

The observation is taken on a change point is :

• For sight

• Back sight

• Intermediate sight

• Both fore sight and back sight

……….type of errors rises due to imperfect focusing.

• Collimation

• Eccentricity

• Paralax

• Hypotenuse allowance

The back sight reading on a bench mark of 'RL. 200.00m is 2.685 and fore sight reading on 'B* is 1.305m the RL of B is:

• 202.685m

• 201.380m

• 203.990m

• 201305m

The height of instrument and the reduced level of a point, if its foresight reading is 1.845 m and the back sight reading on a bench mark of R.L 250.000 m is 2.985 m are :

• 252.985 m and 252.845 m

• 251.845 m and 251.140 m

• 252.985 m and 251.140 m

• 250.845 m and 251.140 m