The staff reading at a distance of 80 m from a level with the bubble at its cent

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Question
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
Options
A. 28.8 secs
B. 41.25 secs
C. 14.52 secs
D. 25.05
E. none of these

Correct Answer

41.25 secs

3. Surveys which are carried out to provide a national grid of control for preparation of accurate maps of large areas, are known
Options
A. plane surveys
B. geodetic surveys
C. geographical surveys
D. topographical surveys.

5. Pick up the correct statement from the following :
Options
A. The horizontal angle between magnetic meridian and true meridian at a place is called magnetic declination or variance of the compass
B. the imaginary lines which pass through points at which the magnetic declinations are equal at a given time are called isogonic lines
C. the isogonic lines through places at which the declination is zero are termed agonic lines
D. all the above.

7. Pick up the incorrect statement from the following :
Options
A. 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
B. an increase in temperature causes a tape to increase in length and the measured distance is too large
C. the straight distance between end points of a suspended tape is reduced by an amount called the sag correction
D. a 100 m tape of cross section 10 mm x 0.25 mm stretches about 10 mm under 5 kg pull.

9. 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 16.50 m away is focussed. The focal length of the focussing lens, is
Options
A. 5.24 cm
B. 6.24 cm
C. 7.24 cm
D. 8.24 cm

10. If D is the degree of the curve of radius R, the exact length of its specified chord, is
Options
A. radius of the curve x sine of half the degree
B. diameter of the curve x sine of half the degree
C. diameter of the curve x cosine of half the degree
D. diameter of the curve x tangent of half the degree.

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