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The staff reading at a distance of 80 m from a level with a bubble at centre is 1.31 m. When the bubble is moved 5 divisions out of the centre, the reading is 1.39 m. Then the angular value of one division of the bubble is:
  • a)
    28.78 sec
  • b)
    41.25 sec
  • c)
    14.25 sec
  • d)
    25.05 sec
Correct answer is option 'B'. Can you explain this answer?
Most Upvoted Answer
The staff reading at a distance of 80 m from a level with a bubble at ...
Given data:
Distance between staff and level (d) = 80 m
Staff reading with bubble at center (B1) = 1.31 m
Staff reading with bubble displaced by 5 divisions (B2) = 1.39 m

To find: Angular value of one division of the bubble

Formula used:
Angular value of one division of the bubble = (B2 - B1) / (5d)

Calculation:
Substituting the given values in the formula, we get:
Angular value of one division of the bubble = (1.39 - 1.31) / (5 x 80)
Angular value of one division of the bubble = 0.08 / 400
Angular value of one division of the bubble = 0.0002 rad

To convert radian to seconds, we use the formula:
1 radian = 206265 seconds
Therefore, the angular value of one division of the bubble in seconds is:
0.0002 x 206265 = 41.253 seconds

Therefore, the correct answer is option (B) 41.25 seconds.
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Community Answer
The staff reading at a distance of 80 m from a level with a bubble at ...
1 division= S/(nD)*206265 in second
S = error in reading= 1.39-1.31=0.08 m
n = no of division bubble is out=5
D = horizontal distance= 80 m
1 division= 206265*0.08/(5*80)= 41.253 seconds
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The staff reading at a distance of 80 m from a level with a bubble at centre is 1.31 m. When the bubble is moved 5 divisions out of the centre, the reading is 1.39 m. Then the angular value of one division of the bubble is:a)28.78 secb)41.25 secc)14.25 secd)25.05 secCorrect answer is option 'B'. Can you explain this answer?
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The staff reading at a distance of 80 m from a level with a bubble at centre is 1.31 m. When the bubble is moved 5 divisions out of the centre, the reading is 1.39 m. Then the angular value of one division of the bubble is:a)28.78 secb)41.25 secc)14.25 secd)25.05 secCorrect answer is option 'B'. Can you explain this answer? for Civil Engineering (CE) 2024 is part of Civil Engineering (CE) preparation. The Question and answers have been prepared according to the Civil Engineering (CE) exam syllabus. Information about The staff reading at a distance of 80 m from a level with a bubble at centre is 1.31 m. When the bubble is moved 5 divisions out of the centre, the reading is 1.39 m. Then the angular value of one division of the bubble is:a)28.78 secb)41.25 secc)14.25 secd)25.05 secCorrect answer is option 'B'. Can you explain this answer? covers all topics & solutions for Civil Engineering (CE) 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for The staff reading at a distance of 80 m from a level with a bubble at centre is 1.31 m. When the bubble is moved 5 divisions out of the centre, the reading is 1.39 m. Then the angular value of one division of the bubble is:a)28.78 secb)41.25 secc)14.25 secd)25.05 secCorrect answer is option 'B'. Can you explain this answer?.
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