1. To change the reading on the circle while measuring an angle
[A] Upper clamp is tightened, and lower clamp is loosened
[B] Upper clamp is loosened, and lower clamp is tightened
[C] Both upper and lower clamps are loosened
[D] Both upper and lower clamps are tightened
Answer: Option B
2. In the method of reiteration of measuring horizontal angles
[A] the same angle is measured three times
[B] the same angle is measured by face-left and face-right observations
[C] the angle is measured, and the instrument turned to close the horizon
[D] the angle is measured three times each using face-left and face-right observations
Answer: Option C
3. When you transit the telescope, you rotate the telescope about the
[A] trunnion axis
[B] vertical axis
[C] optical axis of the telescope
[D] line of collimation
Answer: Option A
4. In the method of repetition for measuring horizontal angles, to rotate the instrument without changing the readings
[A] lower clamp screw is tightened, and upper clamp is loosened
[B] lower clamp screw is loosened, and upper clamp is tightened
[C] any one of the clamp screw is loosened
[D] both the clamp screws are loosened
Answer: Option B