1. The index frame is ______ shaped frame.
a) U
b) V
c) T
d) A
Explanation: The index frame is a T shaped frame consisting of a vertical leg known as clipping arm. It is also called a Vernier frame.
2. In theodolites, two standards resemble the letter ______
a) U
b) V
c) T
d) A
Explanation: Two standards resemble letter A are mounted on the upper plates. The trunnion axis of the telescope is supported on these.
3. Which of the following is not a function of levelling head?
a) To support the main part of the instrument
b) To attach the theodolite to the tripod
c) To provide a mean for levelling the theodolite
d) To provide the exact centering over the station mark
Explanation: A levelling head has three distinctive functions. They are to support the main part of the instrument, to attach the theodolite to the tripod and to provide a mean for levelling the theodolite.
4. In theodolites, the upper plate carriers two plate levels placed at right angles to each other.
a) true
b) false
Explanation: In theodolites, the upper plate carrier’s two plate levels placed at right angles to each other. One of the plate levels is kept parallel to the trunnion axis.
5. The plate level can be centered with the help of _______
a) Focusing screw
b) Foot screw
c) Tangent screw
d) Clip screw
Explanation: The plate level can be centered with the help of foot screw. In some theodolites only one plate level is provided.
6. On clamping the upper screw and unclamping the lower clamp, the instrument can rotate on its outer axis without any relative motion between the two plates.
a) true
b) false
Explanation: On clamping the upper screw and unclamping the lower clamp, the instrument can rotate on its outer axis without any relative motion between the two plates.
7. On unclamping the upper screw and clamping the lower clamp, the instrument can rotate on its inner axis with relative motion between vernier and scale.
a) True
b) false
Explanation: The lower clamp is clamped and the upper clamp is unclamped, the upper plate and the instrument can rotate on the inner axis with a relative motion between the vernier and the scale.
8. Which of the following is used to test the horizontality of the transit axis or trunnion axis?
a) Levelling head
b) Levelling screw
c) Altitude bubble
d) Striding level
Explanation: Some theodolites are fitted with a striding level. It is used to test the horizontality of the transit axis or trunnion axis.
9. Temporary adjustments are those which are made at every instrument setting and preparatory to taking observations.
a) true
b) false
Explanation: Temporary adjustments are those which are made at every instrument setting and preparatory to taking observations. The temporary adjustments are setting over the station, levelling up and elimination parallax.
10. Setting up includes which of the following?
a) Centering
b) Appropriate levelling with the help of tripod legs
c) Both centering and appropriate levelling with the help of tripod legs
d) Levelling with foot screw
Explanation: The operation of setting up includes centering of the instrument over the station mark by a plumb Bob or by optical plummet and appropriate levelling with the help of tripod legs.