M3-OQ1 EDM instrument works on the principle of measuring

1. energy difference
2. phase difference
3. time difference
4. frequency difference

M3-OQ2 The relative accuracy in measurement of distance in a slope angle a is

1. dD / D = sina . da
2. dD / D = cosa . da
3. dD / D = tana . da
4. dD / D = seca . da

M3-OQ3 Normal tension is given by

(i)	(ii)
(iii)	(iv)

where

W is the weight of the tape

A is the cross-sectional area of tape

E is the Young's module of elasticity of tape material

P is tension applied

P_o is pull during calibration

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