Q1: Tilt of the staff in stadia tacheometry increases the intercept if it is

ANS:C - away from the telescope pointing up-hill

When the staff is tilted away from the telescope and pointing uphill in stadia tacheometry, the apparent intercept decreases. This is due to the change in the angle of sight and the resulting effect on the apparent distance between the stadia hairs. In this scenario, as the staff is tilted away from the telescope and pointing uphill, the angle of sight decreases. Consequently, the apparent distance between the stadia hairs in the telescope's reticle appears shorter. As a result, the intercept measurement, which is based on the apparent distance between the stadia hairs, decreases. So, when the staff is tilted away from the telescope and pointing uphill, the intercept decreases because the apparent distance between the stadia hairs appears shorter due to the angle of sight.