# Civil Engineering - Surveying - Discussion

Discussion Forum : Surveying - Section 1 (Q.No. 49)
49.
Keeping the instrument height as 1.5 m, length of staff 4 m, the slope of the ground as 1 in 10, the sight on the down-slope, must be less than
30 m
25 m
20 m
15 m
Explanation:
No answer description is available. Let's discuss.
Discussion:
26 comments Page 1 of 3.

Awais khan said:   3 years ago
By similar triangles;
1/10 = (4-1.5)/X
X = 2.5(10) = 25m.
(6)

Soumya said:   3 years ago
If downslope 25m, If Upward slope asked then it's 55m.
(2)

Naveed Kamal Marwat said:   4 years ago
Downward 25m.

Upward 45m.

Roohullah jan said:   4 years ago
In a simple way we can say that;

Let consider the slope is downward which 1 in 10.

So at 10m, the staff reading becomes 1. 5+1=2. 5m (staff reading).

At 20 m distance reading becomes 3. 5m.

Similarly, at 25 m distance, the reading becomes 4m. Which is the full length of the staff?

Thanks.
(8)

Zomuana said:   4 years ago
Thanks a lot @Sameer.

Ziaullah said:   4 years ago
4 - 1.5 = 2.5.
2.5 * 10 = 25.
(1)

Waleed said:   4 years ago

Vikash said:   4 years ago
Thanks all.

Shubham said:   5 years ago
Thanks @Sameer.

Malla pramod said:   5 years ago
Thanks all.