The elevation of a point with respect to Mean Sea Level or a fixed point is known as ______.

Reduced level

Which of the following statements is TRUE regarding back sight in leveling? A) It is the last reading taken. B) It is known as minus sight. C) It is the first reading taken after setting up the instrument. D) It is used for calculating fore sight.

C) It is the first reading taken after setting up the instrument.

True or False: The height of instrument is calculated as RL + Back Sight.

True

Riddle: I am a correction factor, negative for curvature and positive for refraction. What am I?

Combined Correction

A benchmark is defined as a relatively permanent point of reference whose elevation with respect to some assumed datum is known. True or False?

True

The formula for curvature correction (CC) is CC = ______.

-(d²/2R)

If the total sum of back sights is 3.085 m and fore sights is 5.645 m, what is the fall in the level?

2.56 m

Which of the following is NOT a correct statement? A) The first reading from a level station is a 'Fore Sight'. B) Contours of different elevations may intersect each other. C) Planimeter is used for measuring area. D) Basic principle of surveying is to work from parts to whole.

A) The first reading from a level station is a 'Fore Sight'.

The combined correction due to curvature and refraction for a distance of 1 km is approximately ______.

0.0673 m

Fill in the blank: The last reading taken from an instrument station is called ______.

Fore sight

True or False: The height of the instrument is always greater than the reduced level of the instrument station.

False. The height of the instrument may be equal to or less than the reduced level depending on the readings.

If a staff reading on a benchmark is 1.350 m and on a peg across a river is 1.550 m, what can be inferred about the elevation of the peg?

The peg is at a lower elevation than the benchmark.

Riddle: I tell you how high or low you are above sea level. What am I?

Reduced Level (RL)

In reciprocal leveling, errors due to ______ and ______ can be minimized.

Earth's curvature; atmospheric refraction

What is the distance of visible horizon (d) formula that considers both curvature and refraction?

D = 3.8553√ckm

The staff reading taken on a workshop floor is 0.645 m. If the reduced level of the floor is 40.500 m, what is the reduced level of the bottom of the beam with an inverted staff reading of 2.960 m?

44.105 m

If the distance between two points is 20 m and their reduced levels are +49.600 m and +51.870 m respectively, where does the +51.000 m contour cut?

12.33 m from point P

Which of the following is a factor that affects the sensitivity of a bubble tube? A) Length of the tube B) Temperature C) Pressure D) All of the above

A) Length of the tube

Which of the following is used as a point of reference in leveling whose elevation is known? A) Fore sight B) Bench mark C) Back sight D) Intermediate sight

B) Bench mark

True or False: The curvature correction (CC) is always added when calculating the reduced level in leveling surveys.

False. The curvature correction (CC) is always subtractive.