1. The lines of earth's magnetic field run from ?

south to north

north to south

east to west

west to east

Answer: north to south

Explanation:


2. The theodolite is an instrument used for measuring very accurately ?

horizontal angles only

vertical angles only

horizontal and vertical angles

linear measurements

Answer: horizontal and vertical angles

Explanation:


3. In the surveying telescopes, cross hairs are fitted in ?

centre of the telescope

optical centre of eye piece

front of the eye piece

front of the objective

Answer: front of the eye piece

Explanation:


4. When the image formed by the objective is not situated in the plane of cross-hairs, ?

the cross-hairs should be adjusted

the eye-piece should be focussed

the objective should be focussed

the parallex should be removed

Answer: the objective should be focussed

Explanation:


5. For removing the parallex, ?

the eye-piece should be focussed for distinct vision of cross-haris

the image of the object should be brought in the plane of cross-hairs

either (a) or (b)

both (a) and (b)

Answer: both (a) and (b)

Explanation:


6. The representative fraction 1/2500 means that the scale is ?

1 cm = 0.25 m

1 cm = 2.5 m

1 cm = 25 m

1 cm = 250 m

Answer: 1 cm = 25 m

Explanation:


7. The ratio of the focal length of the objective to that of an eye-piece of a telescope is called its ?

definition

brightness

sensitivity

magnification

Answer: magnification

Explanation:


8. An angle measured clockwise from the proceeding survey line to the following survey line is called ?

direct angle

vertical angle

horizontal angle

deflection angle

Answer: direct angle

Explanation:


9. If a chain is used at a temperature ............. the temperature at which it was calibrated, the error in measured length is negative. ?

equal to

lower than

higher than known

Answer: higher than known

Explanation:


10. The obstacle, which obstructs chaining but not vision, is ?

river

hill

rising ground

all of these

Answer: river

Explanation: