Duration:50 min PART A -Answer all the 10 Questions 10x2.5-25 When a tape is sho

Question

Duration:50 min PART A -Answer all the 10 Questions 10x2.5-25 When a tape is shorter than the actual length, the correction will be (a) a positive correction (b) a negative correction (c) a zero correction (d) None of the above 1. 2. First observed sight in a level observation is (a) fore sight (b) back sight (c) taken over a target point (d) taken over a known bench mark (e) both a and d (f) both b and d 3. In an observation the following data were recorded. 206.139, 206.137, 206.144, 206.135 and 206.148. Median of these observed data is 4. Fill in the blanks: If Zenith angle (z) is 30°, the vertical angle alpha is 5. Electronic distance Measurement (EDM), we use a reflector to reflect the light wave. The reflector is a (a) A concave lens (b) A convex lens (c) A comer cube prism (d) None of the above

Explanation / Answer

ANS-1-(b)When a tape is shorter than the actual length then the error is positive.Hence to compensate this positive eroor negative correction is applied.

ANS-2-(b)First observed sight in a level observation is back sight.

A backsight is the first sight reading recorded after setting the instrument.Backsight reading provide the Reduced level or bench mark or datum.

ANS-3-Step 1-Arrange the numbers into the increasing order

206.135 , 206.137, 206.139 , 206.144 , 206.148

Step 2-Find the number in middle

Hence 206.139 is in the middle.so it is the median.

ANS-4- zenith angle=900 - alpha angle

300 =900 - alpha angle

alpha angle=600

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