Which of the following error cannot be eliminated in reciprocal levell

1.	Which of the following error cannot be eliminated in reciprocal levelling?
A.	error in instrument adjustment
B.	combined effect of earth‚Äö√Ñ√∂‚àö√ë‚àö¬•s curvature and refraction of atmosphere
C.	variations in average refraction
D.	variation in temperature
Answer» E.

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When an instrument is at P the staff readings on P is 2.748 and on Q is 1.824 when instrument at Q the staff readings on P is 1.606 and Q is 0.928. Distance between P and Q is 1010 mts. R.L. of P is 126.386. Find the angular error in collimation adjustment of the instrument?
When instrument is at P the staff readings on P is 2.748 and on Q is 1.824 when instrument at Q the staff readings on P is 1.606and Q is 0.928. Distance between P and Q is 1010 mts. R.L. of P is 126.386. Find error due to collimation?
When an instrument is at P the staff readings on P is 2.748 and on Q is 1.824 when instrument at Q the staff readings on P is 1.606and Q is 0.928. Distance between P and Q is 1010 mts. R.L. of P is 126.386. Find true R.L of Q?
When instrument is at P the staff readings on P is 1.824 and on Q is 2.748. When instrument at Q the staff readings on P is 0.928 and Q is 1.606. Distance between P and Q is 1010 mts. R.L. of P is 126.386. Find combined correction for curvature and refraction?
When an instrument is at P the staff readings on P is 1.824 and on Q is 2.748. When the instrument at Q the staff readings on P is 0.928 and Q is 1.606. Distance between P and Q is 1010 mts. R.L. of P is 126.386. Find true R.L. of Q?
WHEN_INSTRUMENT_IS_AT_P_THE_STAFF_READINGS_ON_P_IS_2.748_AND_ON_Q_IS_1.824_WHEN_INSTRUMENT_AT_Q_THE_STAFF_READINGS_ON_P_IS_1.606AND_Q_IS_0.928._DISTANCE_BETWEEN_P_AND_Q_IS_1010_MTS._R.L._OF_P_IS_126.386._FIND_ERROR_DUE_TO_COLLIMATION??$
When_an_instrument_is_at_P_the_staff_readings_on_P_is_2.748_and_on_Q_is_1.824_when_instrument_at_Q_the_staff_readings_on_P_is_1.606and_Q_is_0.928._Distance_between_P_and_Q_is_1010_mts._R.L._of_P_is_126.386._Find_the_angular_error_in_collimation_adjustment_of_the_instrument?$
When instrument is at P the staff readings on P is 2.748 and on Q is 1.824 when instrument at Q the staff readings on P is 1.606and Q is 0.928. Distance between P and Q is 1010 mts. R.L. of P is 126.386. Find combined effect correction for curvature and refraction?
When an instrument is at P the staff readings on P is 2.748 and on Q is 1.824 when instrument at Q the staff readings on P is 1.606and Q is 0.928. Distance between P and Q is 1010 mts. R.L. of P is 126.386. Find true R.L of Q?
When an instrument is at P the staff readings on P is 1.824 and on Q is 2.748. When instrument at Q the staff readings on P is 0.928 and Q is 1.606. Distance between P and Q is 1010 mts. R.L. of P is 126.386. Find the error due to collimation?

Which of the following error cannot be eliminated in reciprocal levelling?

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